Melange yarn production's hidden water cost: 35x more water used in cotton cultivation than manufacturing.

Why It Matters

This insight highlights the critical need for designers to consider the entire supply chain, not just the immediate production processes. Understanding these upstream impacts allows for more effective strategies to reduce overall environmental burdens, particularly water consumption and wastewater discharge.

Key Finding

The study found that while using recycled water in manufacturing helps, the biggest environmental impact, especially concerning water use, comes from the initial cotton farming stage, which uses vastly more water than the yarn production itself.

Key Findings

• Recycled water usage significantly reduces environmental burdens in melange yarn manufacturing.
• Indirect water consumption during cotton cultivation is approximately 35 times greater than direct water consumption in yarn manufacturing.

Research Evidence

Aim: To quantify the cradle-to-gate water and carbon footprint of melange yarn manufacturing and identify key areas for environmental burden reduction.

Method: Life Cycle Assessment (LCA) using the ReCiPe method.

Procedure: Primary data on melange yarn manufacturing processes were collected through on-site investigations. A cradle-to-gate assessment was performed to evaluate water footprint and carbon footprint, with specific attention paid to the contribution of cotton cultivation.

Context: Textile manufacturing, specifically melange yarn production.

Design Principle

Upstream impact assessment is crucial for comprehensive environmental responsibility in product design.

How to Apply

When designing textile products, conduct a preliminary assessment of the water footprint of raw material cultivation, such as cotton, and explore options for sourcing or material substitution to mitigate this impact.

Limitations

The study focuses on a cradle-to-gate perspective, not including the use and end-of-life phases. Specific regional variations in cotton cultivation practices and water availability were not detailed.

Student Guide (IB Design Technology)

Simple Explanation: When making clothes from melange yarn, most of the water used isn't in the factory making the yarn, but way before that, when growing the cotton. This means we need to think about how cotton is grown to save water.

Why This Matters: Understanding the full life cycle of materials, including their agricultural origins, is essential for creating truly sustainable designs. This research shows that focusing only on manufacturing can miss the biggest environmental impacts.

Critical Thinking: If the majority of water impact is in cotton cultivation, what are the most effective design interventions? Should designers focus on material innovation, agricultural partnerships, or consumer education about material origins?

IA-Ready Paragraph: The environmental impact of textile production extends far beyond the manufacturing process itself. Research indicates that the cultivation of raw materials, such as cotton for melange yarns, accounts for a disproportionately large amount of water consumption, often 35 times more than direct manufacturing use (Liu et al., 2020). This highlights the critical need for designers to consider upstream agricultural practices and explore sustainable sourcing or alternative materials to effectively reduce a product's overall water footprint.

Project Tips

• When researching materials for your design project, look for data on the 'water footprint' of raw material cultivation.
• Consider how your choice of material impacts resources like water, even before it reaches your manufacturing process.

How to Use in IA

• Reference this study when discussing the environmental impact of material choices, particularly for textiles, and justify your selection of materials based on their upstream resource consumption.

Examiner Tips

• Demonstrate an understanding of the full life cycle of materials, not just the manufacturing stage, when evaluating design choices.

Independent Variable: ["Use of recycled water in manufacturing","Stage of production (cultivation vs. manufacturing)"]

Dependent Variable: ["Water footprint (indirect and direct)","Carbon footprint"]

Controlled Variables: ["Type of yarn (melange)","Assessment methodology (ReCiPe)"]

Strengths

• Utilizes a recognized LCA methodology (ReCiPe).
• Includes primary data collected from on-site investigations, increasing relevance to actual manufacturing.

Critical Questions

• How can designers influence or collaborate with agricultural practices to reduce water consumption?
• What are the trade-offs between using materials with lower cultivation water footprints and other design considerations like cost, performance, or aesthetics?

Extended Essay Application

• Investigate the water footprint of different natural fibers used in a specific product category (e.g., activewear, home textiles) and propose design strategies to minimize this impact.
• Explore the feasibility of using recycled or regenerated fibers that bypass the water-intensive cultivation stage.

Source

Cradle-to-gate water and carbon footprint assessment of melange yarns manufacturing · Procedia CIRP · 2020 · 10.1016/j.procir.2020.01.051