INTERNATIONAL JOURNAL OF LATEST TECHNOLOGY IN ENGINEERING,

MANAGEMENT & APPLIED SCIENCE (IJLTEMAS)

ISSN 2278-2540 | DOI: 10.51583/IJLTEMAS | Volume XIV, Issue XII, December 2025

Integrating Solid Waste Management into Sustainable

Manufacturing Systems: A Life Cycle Assessment Approach

Engr. Nancy M. Santiago

Bulacan State University - College of Engineering

DOI : https://doi.org/10.51583/IJLTEMAS.2025.1412000034

Received: 17 December 2025; Accepted: 24 December 2025; Published: 31 December 2025

ABSTRACT

The study aimed to integrate solid waste management (SWM) strategies into sustainable manufacturing systems

using the Life Cycle Assessment (LCA) framework to evaluate environmental performance and identify waste

reduction opportunities. Conducted among selected manufacturing facilities in Bulacan, Philippines, the research

employed a descriptive–analytical design supported by quantitative and qualitative data. The study focused on

determining the major sources and types of solid waste, assessing their environmental impacts through LCA,

and developing an integrated framework for sustainable waste management. Results revealed that most waste

originated from machining, packaging, and post-processing operations, with metal and plastic wastes comprising

the largest share. The Life Cycle Impact Assessment (LCIA) indicated a 32% reduction in global warming

potential, a 23% decrease in resource depletion, and a 40% reduction in landfill waste after integrating SWM

strategies. These improvements were achieved through source segregation, recycling, and lean-green process

optimization. The developed framework emphasized four core components: waste identification and

classification, LCA-based monitoring, process optimization, and continuous improvement aligned with ISO

14001:2015 and Sustainable Development Goal 12. The findings affirm that the integration of SWM and LCA

enhances resource efficiency, reduces environmental impacts, and supports the transition toward circular

economy practices in the manufacturing sector.

Keywords: solid waste management, sustainable manufacturing, life cycle assessment, lean-green production,

circular economy

INTRODUCTION

The rapid expansion of industrial and manufacturing sectors has significantly contributed to economic growth

and technological advancement. However, this progress has also led to a corresponding rise in solid waste

generation, resulting in serious environmental and public health challenges. Manufacturing industries are among

the largest contributors to solid waste, producing materials such as metal scraps, packaging residues, defective

parts, and process by-products. When improperly managed, these wastes contribute to land degradation, air and

water pollution, and increased greenhouse gas emissions. According to the World Bank [1], global solid waste

generation is expected to reach 3.4 billion tons by 2050, with industrial and manufacturing sources comprising

a major share. These realities emphasize the urgent need for an integrated approach that ensures productivity

while promoting environmental sustainability.

In response, the concept of sustainable manufacturing has emerged as a central strategy for reducing waste and

resource consumption. It integrates environmental considerations into every stage of production—design,

processing, assembly, packaging, and disposal—to achieve efficiency without compromising ecological balance.

One of the most effective analytical tools for understanding and improving the environmental performance of

manufacturing systems is the Life Cycle Assessment (LCA). This methodology evaluates the environmental

impact of a product or process from raw material extraction to end-of-life management, providing a scientific

basis for identifying waste generation hotspots and improvement opportunities [2].

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INTERNATIONAL JOURNAL OF LATEST TECHNOLOGY IN ENGINEERING,

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ISSN 2278-2540 | DOI: 10.51583/IJLTEMAS | Volume XIV, Issue XII, December 2025

This study, titled “Integrating Solid Waste Management into Sustainable Manufacturing Systems: A Life Cycle

Assessment Approach,” explored the incorporation of solid waste management (SWM) practices within

manufacturing operations. The goal was to determine how sustainable waste handling, recycling, and material

recovery can be systematically embedded into production systems. Through the use of LCA, the research

examined the material flow, energy use, and waste outputs across various stages of manufacturing in selected

facilities in Bulacan, Philippines.

Findings revealed that most waste originated during machining and post-processing operations, including

packaging residues and unused materials. By adopting structured waste management interventions such as

segregation at source, recycling, and the implementation of lean and green manufacturing principles, industries

were able to minimize waste volume, enhance operational efficiency, and reduce environmental impacts. The

integration of SWM practices also demonstrated measurable improvements in compliance with ISO 14001:2015

environmental management standards and alignment with Sustainable Development Goal 12 – Responsible

Consumption and Production.

Overall, the results highlight that integrating solid waste management into manufacturing systems is both an

environmental necessity and a strategic advantage. Embedding LCA-guided waste management into the core of

manufacturing operations promotes resource optimization, cost reduction, and long-term sustainability. This

approach not only transforms traditional linear production systems into circular and resource-efficient processes

but also reinforces the vital role of manufacturing engineering in advancing sustainable industrial development.

Objectives of the Study. The general objective of the study is to integrate solid waste management practices

into sustainable manufacturing systems through the application of a Life Cycle Assessment (LCA) approach. By

evaluating the environmental impacts of manufacturing processes and identifying waste generation hotspots, the

study aimed to develop a framework that promotes efficient resource utilization, waste minimization, and

environmentally responsible production.

Specifically, the study aimed to:

1. Identify and classify the major types and sources of solid waste generated in selected manufacturing

processes;

2. Evaluate the environmental impacts associated with waste generation using the Life Cycle Assessment

methodology;

3. Assess the effectiveness of existing solid waste management practices implemented within the

manufacturing facilities;

4. Develop an integrated framework or model for incorporating sustainable solid waste management into

manufacturing systems; and

5. Recommend strategies and policies that will enhance waste reduction, recycling, and resource recovery

in alignment with sustainable manufacturing principles and relevant environmental standards such as

ISO 14001:2015 and SDG 12 – Responsible Consumption and Production.

Scope and Delimitation. This study focused on the integration of solid waste management (SWM) practices

into sustainable manufacturing systems through the use of the Life Cycle Assessment (LCA) approach. It was

conducted among selected manufacturing facilities located in Bulacan, Philippines, representing various types

of production processes such as metal fabrication, packaging, and assembly operations. The research primarily

examined the types, quantities, and sources of solid waste generated within these facilities and evaluated their

corresponding environmental impacts throughout the product life cycle, from raw material acquisition to waste

disposal. Specifically, the study covered the identification and characterization of solid waste generated at

different stages of the manufacturing process, the assessment of environmental impacts based on material flow,

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INTERNATIONAL JOURNAL OF LATEST TECHNOLOGY IN ENGINEERING,

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ISSN 2278-2540 | DOI: 10.51583/IJLTEMAS | Volume XIV, Issue XII, December 2025

energy consumption, and waste generation data, the evaluation of existing waste management systems including

segregation, recycling, and waste reduction initiatives, and the development of a conceptual framework for

integrating sustainable waste management into manufacturing operations.

The study was delimited to manufacturing firms within Bulacan due to their accessibility, operational diversity,

and relevance to the region’s industrial profile. It did not include hazardous waste analysis, wastewater treatment

processes, or air emissions monitoring, as these areas fall under separate environmental domains. The

environmental impact assessment was limited to measurable solid waste-related parameters and did not

encompass economic or social life cycle assessments in detail. Moreover, the findings and recommendations

presented were based on the specific operational conditions and practices observed in the selected facilities,

which may differ from other industries with varying production scales or technologies. Despite these limitations,

the insights and framework developed in this study provide valuable guidance for improving waste management

efficiency and promoting sustainability within the manufacturing sector.

METHODS

This study employed a descriptive – analytical research design using the Life Cycle Assessment (LCA) approach

to evaluate the integration of solid waste management (SWM) practices into sustainable manufacturing systems.

The descriptive component focused on identifying and classifying the types and sources of solid waste generated

in manufacturing operations, while the analytical aspect assessed their environmental impacts throughout the

product life cycle. The LCA methodology was selected as it provides a comprehensive and scientific means of

evaluating the environmental performance of systems, products, and processes, particularly in identifying

hotspots for waste generation and energy inefficiency [3]. The LCA approach, as standardized by the

International Organization for Standardization [2], offers a structured framework for assessing inputs, outputs,

and potential environmental impacts across each stage of a product’s life—from raw material extraction to end-

of-life disposal.

The study was conducted in selected manufacturing facilities located in Bulacan, Philippines, an area recognized

for its diverse industrial operations including metal fabrication, packaging, and assembly. These facilities were

chosen based on accessibility, production diversity, and willingness to participate. Participants consisted of

production managers, environmental officers, and quality assurance engineers, who possess technical knowledge

and direct involvement in waste handling and environmental compliance. The researcher coordinated with

company representatives to ensure accurate, reliable, and confidential data collection.

Data collection followed three major stages: preliminary assessment, on-site data gathering, and validation and

analysis. During the preliminary stage, a waste audit checklist and interview guide were developed to identify

the types, quantities, and sources of solid waste. On-site data gathering involved direct observation of production

areas, measurement of waste volumes, and documentation of material and energy flows. Semi-structured

interviews were conducted to gain insights into existing solid waste management practices and sustainability

initiatives. The validation stage involved cross-checking data with company reports, production logs, and waste

manifests to ensure consistency and accuracy. Similar mixed-method approaches have been found effective in

combining quantitative waste analysis with qualitative assessments of process efficiency [4].

The analysis followed the Life Cycle Assessment framework as described in ISO 14040:2019, consisting of four

key phases: goal and scope definition, life cycle inventory (LCI), life cycle impact assessment (LCIA), and

interpretation. The goal and scope phase defined the boundaries of the manufacturing system and identified

waste generation hotspots. The LCI phase quantified the inputs (materials and energy) and outputs (products,

by-products, and waste) of each process, while the LCIA evaluated potential environmental impacts such as

resource depletion, waste accumulation, and greenhouse gas emissions. The interpretation phase synthesized the

results to identify improvement opportunities and propose sustainable manufacturing interventions. Data were

processed using OpenLCAand SimaPro software, supported by Microsoft Excel for tabulation and visualization.

Following the analytical phase, a conceptual framework was developed to integrate solid waste management

strategies into manufacturing operations, emphasizing recycling, waste reduction, and process optimization.

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ISSN 2278-2540 | DOI: 10.51583/IJLTEMAS | Volume XIV, Issue XII, December 2025

Ethical standards were observed throughout the study. Informed consent was obtained from all participants and

partner facilities, and data confidentiality was strictly maintained. Company names and specific operational

details were withheld to protect proprietary information. All research procedures complied with institutional

ethics guidelines and environmental research standards to ensure data integrity and respect for participant rights

[5].

RESULTS AND DISCUSSION

The analysis of data gathered from selected manufacturing facilities in Bulacan revealed significant insights into

the types, sources, and environmental impacts of solid waste generated during various stages of production. The

findings were presented and discussed based on the four phases of the Life Cycle Assessment (LCA) framework,

goal and scope definition, life cycle inventory (LCI), life cycle impact assessment (LCIA), and interpretation.

Types and Sources of Solid Waste. The analysis of the selected manufacturing facilities revealed that the

majority of solid waste originated from machining, packaging, and post-processing operations. The most

common types included metal scraps, plastic packaging, defective components, and paper-based residues, with

metal and plastic waste comprising the largest proportion. As presented in Table 1, metal scraps accounted for

approximately 35% of total waste, primarily generated from cutting and machining operations. Plastic packaging

materials contributed 28%, largely from assembly and shipment activities, while paper and cardboard accounted

for 12% from administrative and packing functions.

Table 1. Types and Sources of Solid Waste Generated by Manufacturing Facilities

Type of Waste

Metal scraps

Main

Source/Process

Average Quantity

(kg/month)

Percentage of Total

Waste (%)

Disposal or Recovery

Method

Machining,

cutting

1,200

950

420

380

450

Recycled or sold to

scrap buyers

Plastic

packaging

Assembly,

packaging

Collected

recycling

for

Paper and

cardboard

Office, packing

Reused or sold

Defective

components

Production rejects

Reprocessed

possible

where

Mixed solid

waste

Cleaning, canteen,

etc.

Sent to landfill

These findings are consistent with previous studies [6], which reported that small- and medium-scale

manufacturers typically produce large quantities of recyclable but underutilized materials due to weak waste

segregation and handling systems. The data emphasize the potential for material recovery, particularly in metal

and plastic waste streams, which can be recycled to reduce production costs and environmental burden.

Material and Energy Inputs (Life Cycle Inventory). The Life Cycle Inventory (LCI) analysis quantified the

material and energy consumption at each stage of production. As shown in Table 2, the machining and forming

stage demonstrated the highest energy demand, averaging 4.6 kWh per unit, and produced the largest quantity

of waste at 2.1 kg per unit. Meanwhile, the raw material processing stage showed the greatest material input per

unit at 8.5 kg, highlighting the intensity of resource use during early manufacturing.

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Table 2. Life Cycle Inventory (LCI) Data Summary for Material and Energy Inputs

Manufacturing Stage

Material Input

(kg/unit)

Energy Use

(kWh/unit)

Waste Generated

(kg/unit)

Recyclable Portion

(%)

Raw material

processing

8.5

7.8

6.2

3.2

4.6

2.5

1.2

2.1

0.9

Machining and

forming

Assembly and

finishing

Packaging

2.4

1.8

1.1

0.6

0.8

0.2

Distribution

This result supports previous findings [3], which showed that the processing stage contributes the most to waste

generation and energy consumption due to inefficient conversion rates and lack of waste recovery systems. The

LCI findings suggest that implementing cleaner production technologies and recycling systems at these stages

could significantly enhance resource efficiency and reduce waste disposal.

Environmental Impact Assessment (LCIA) Results. The Life Cycle Impact Assessment (LCIA) results

revealed that integrating solid waste management practices had a measurable positive effect on environmental

performance. As shown in Table 3, the Global Warming Potential (GWP) decreased from 18.5 kg CO₂ equivalent

per unit to 12.6 kg, reflecting a 32% reduction after SWM interventions. Likewise, resource depletion decreased

by 23%, while waste sent to landfill dropped by 40%. These results affirm previous studies [7], which found that

life cycle-based material recovery significantly reduces both energy consumption and greenhouse gas emissions

in manufacturing systems.

Table 3. Life cycle Impact Assessment (LCIA) Results

Impact Category

Unit of

Measurement

Baseline

Value

After SWM

Integration

Reduction

Global Warming Potential (CO₂

eq.)

kg CO₂ eq./unit

18.5

12.6

32%

Resource Depletion

Waste to Landfill

Water Use

MJ energy/unit

kg/unit

520

5.2

400

3.1

23%

40%

10%

L/unit

210

190

The findings also indicated a 10% reduction in water consumption, primarily due to process optimization and

reuse strategies introduced during production. Overall, the environmental improvements validate the

effectiveness of integrating waste management and life cycle analysis in achieving sustainable manufacturing

outcomes.

Evaluation of Existing Waste Management Practices. An evaluation of existing waste management systems

revealed partial implementation of environmental programs, with strong emphasis on recycling and collection

but limited activities focused on source reduction. As summarized in Table 4, recycling and reuse programs

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INTERNATIONAL JOURNAL OF LATEST TECHNOLOGY IN ENGINEERING,

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scored the highest effectiveness rating of 4.2 out of 5, particularly for metal and plastic waste. However,

employee training and monitoring systems were found to be underdeveloped, with scores below 3.0, reflecting

minimal engagement and inconsistent reporting practices.

Table 4. Evaluation of Existing Solid Waste Management Practices

Practice

Implementation

Frequency

Effectiveness Rating

(1–5)

Remarks

Segregation at source

Recycling/reuse programs

Moderate

3.8

4.2

2.7

Inconsistent across

departments

High

Effective for metal and

plastic waste

Employee training on waste

handling

Low

Limited participation

Monitoring and reporting

Moderate

High

3.5

4.1

Needs digital tracking tools

Process optimization

initiatives

Lean practices show

positive impact

These findings are supported by previous studies [8], which emphasized that lean and green integration, when

paired with proper workforce participation, leads to significant improvements in environmental performance.

Strengthening employee awareness, monitoring tools, and management policies could therefore enhance

compliance with ISO 14001:2015 and the goals of Sustainable Development Goal (SDG) 12 – Responsible

Consumption and Production.

Framework for Sustainable Waste Integration. Based on the synthesis of findings, an integrated framework

for sustainable solid waste management in manufacturing systems was developed, as shown in Table 5. The

framework includes four key components: (1) Waste Identification and Classification, (2) LCA-Based Impact

Monitoring, (3) Process Optimization through Lean-Green Integration, and (4) Continuous Improvement and

Policy Alignment. Each component provides a structured approach for embedding waste management into

manufacturing processes while supporting continuous improvement and compliance with environmental

standards.

Table 5. Framework for Integrating Solid Waste Management into Manufacturing Systems

Framework Component

Objective

Key Activities

Expected Outcomes

Waste Identification and

Classification

Determine waste

sources

Conduct audits and waste

profiling

Accurate waste

quantification

LCA-Based Impact

Monitoring

Quantify

environmental

impacts

Apply LCA tools

(OpenLCA, SimaPro)

Measurable

sustainability metrics

Process Optimization

Reduce waste and

emissions

Implement lean-green

manufacturing

Reduced resource use

Continuous Improvement

and Policy Alignment

Ensure sustainability

Conduct regular reviews,

ISO compliance

Institutionalized SWM

integration

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The framework reflects a holistic approach to sustainability, aligning with previous studies [9], which

emphasized that LCA-driven waste management systems promote operational resilience, efficiency, and

corporate accountability. It serves as a strategic tool for manufacturers to systematically reduce waste, conserve

resources, and institutionalize environmentally responsible production practices.

Discussion Summary. Overall, the results underscore the critical role of Life Cycle Assessment as a decision-

support tool in achieving sustainable manufacturing. The findings revealed that integrating solid waste

management into production systems can significantly reduce waste volume, improve resource efficiency, and

enhance environmental compliance. Facilities that adopted LCA-guided waste strategies experienced

measurable improvements in energy use and waste reduction, confirming the practical applicability of life cycle-

based methodologies in industrial sustainability. This aligns with global trends emphasizing circular economy

principles, where waste materials are continuously recovered and reintegrated into production systems [10].

The study highlights that the transition from conventional to sustainable manufacturing requires not only

technological upgrades but also cultural and organizational shifts toward environmental accountability. The

integration of LCA-based waste management offers a pathway for manufacturers to strengthen competitiveness

while contributing to ecological preservation and sustainable development.

CONCLUSION AND RECOMMENDATIONS

The results of the study revealed that the integration of solid waste management (SWM) strategies into

sustainable manufacturing systems through the Life Cycle Assessment (LCA) framework significantly improves

environmental performance, operational efficiency, and compliance with sustainability standards. The

assessment of selected manufacturing facilities in Bulacan showed that the majority of solid waste originated

from machining, packaging, and post-processing operations, with metal and plastic waste comprising the largest

proportion. These materials presented high potential for recycling and material recovery, which could

considerably reduce landfill dependency and production costs. The Life Cycle Impact Assessment (LCIA)

further indicated that the most critical environmental impacts occurred during material processing and machining

stages, primarily due to high energy consumption and inefficient material utilization. The application of LCA-

guided waste management strategies, including segregation at source, recycling, and process optimization,

resulted in measurable reductions in greenhouse gas emissions, resource depletion, and total waste generation.

Moreover, the study developed an integrated framework for sustainable solid waste management that includes

four essential components: waste identification and classification, LCA-based monitoring, process optimization

through lean-green integration, and continuous improvement with policy alignment. This approach aligns with

previous studies highlighting the synergy between life cycle thinking and lean manufacturing for sustainability

enhancement [11]. The model also reinforces the alignment of industrial practices with ISO 14001:2015

Environmental Management Standards and the United Nations Sustainable Development Goal 12 (Responsible

Consumption and Production) [12]. The findings underscored the vital role of manufacturing engineers and

environmental managers in advancing sustainability by embedding environmental accountability and data-

driven decision-making into each stage of production. Overall, the study concluded that sustainable

manufacturing can be achieved through the synergy of solid waste management principles and life cycle

thinking, leading to minimized environmental impacts, improved cost efficiency, and enhanced industry

competitiveness.

In light of these findings, several recommendations are proposed to strengthen the integration of solid waste

management into manufacturing systems. First, manufacturing firms are encouraged to institutionalize Life

Cycle Assessment practices as part of their routine environmental management to identify waste-intensive stages

and guide improvements toward sustainability. Second, industries should establish comprehensive solid waste

management policies aligned with ISO 14001:2015 standards, incorporating waste segregation protocols,

recycling targets, and compliance monitoring mechanisms. Third, employee training and awareness programs

should be strengthened to foster environmental responsibility and encourage active participation in waste

reduction initiatives. Fourth, manufacturers are advised to adopt lean-green manufacturing techniques such as

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5S, Kaizen, and Value Stream Mapping to minimize waste, optimize energy use, and improve overall efficiency.

Fifth, companies should invest in waste recovery and recycling technologies to promote material circularity and

reduce external disposal costs. Sixth, collaboration with academic institutions, local government units, and

environmental agencies should be enhanced to support research, technical assistance, and innovation in

sustainable manufacturing. Lastly, manufacturers should establish continuous improvement programs that

include regular performance evaluations and feedback mechanisms to ensure that sustainability efforts remain

adaptive to technological and market developments.

By implementing these recommendations, manufacturing industries can achieve a balance between productivity

and environmental stewardship. The integration of solid waste management and life cycle assessment fosters a

shift toward circular economy principles, where waste is treated as a valuable resource and sustainability

becomes an integral component of industrial growth, competitiveness, and resilience.

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