Mao Jiaer, Chen Haoyu, Xu Xiangyang, Zhu Liang
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Engineering Laboratory of Water Pollution Control, Hangzhou 310058, China.
Sci Total Environ. 2024 Jun 1;927:172301. doi: 10.1016/j.scitotenv.2024.172301. Epub 2024 Apr 8.
The urgency of achieving carbon neutrality needs a reduction in greenhouse gas (GHG) emissions from the textile industry. Printing and dyeing wastewater (PDWW) plays a crucial role in the textile industry. The incomplete assessment of GHG emissions from PDWW impedes the attainment of carbon neutrality. Here, we firstly introduced a more standardized and systematic life-cycle GHG emission accounting method for printing and dyeing wastewater treatment and reuse system (PDWTRS) and proposed possible low-carbon pathways to achieve carbon neutrality. Utilizing case-specific operational data over 12 months, the study revealed that the PDWTRS generated 3.49 kg COeq/m or 1.58 kg COeq/kg COD in 2022. This exceeded the GHG intensity of municipal wastewater treatment (ranged from 0.58 to 1.14 kg COeq/m). The primary contributor to GHG emissions was energy consumption (33 %), with the energy mix (sensitivity = 0.38) and consumption (sensitivity = 0.33) exerting the most significant impact on GHG emission intensity respectively. Employing prospective life cycle assessment (LCA), our study explored the potential of the anaerobic membrane bioreactor (AnMBR) to reduce emissions by 0.54 kg COeq/m and the solar-driven photocatalytic membrane reactor (PMR) to decrease by 0.20 kg COeq/m by 2050. Our projections suggested that the PDWTRS could achieve net-zero emissions before 2040 through an adoption of progressive transition to low-carbon management, with a GHG emission intensity of -0.10 kg COeq/m by 2050. Importantly, the study underscored the escalating significance of developing sustainable technologies for reclaimed water production amid water scarcity and climate change. The study may serve as a reminder of the critical role of PDWW treatment in carbon reduction within the textile industry and provides a roadmap for potential pathways towards carbon neutrality for PDWTRS.
实现碳中和的紧迫性要求减少纺织行业的温室气体（GHG）排放。印染废水（PDWW）在纺织行业中起着关键作用。对印染废水温室气体排放的不完全评估阻碍了碳中和目标的实现。在此，我们首先引入了一种更标准化、系统化的印染废水处理与回用系统（PDWTRS）生命周期温室气体排放核算方法，并提出了实现碳中和的可能低碳途径。利用12个月的特定案例运行数据，该研究表明，2022年PDWTRS产生了3.49千克二氧化碳当量/立方米或1.58千克二氧化碳当量/千克化学需氧量。这超过了城市污水处理的温室气体强度（范围为0.58至1.14千克二氧化碳当量/立方米）。温室气体排放的主要贡献因素是能源消耗（33%），能源结构（敏感度=0.38）和能源消耗（敏感度=0.33）分别对温室气体排放强度产生最显著影响。通过前瞻性生命周期评估（LCA），我们的研究探索了到2050年厌氧膜生物反应器（AnMBR）减排0.54千克二氧化碳当量/立方米以及太阳能驱动光催化膜反应器（PMR）减排0.20千克二氧化碳当量/立方米的潜力。我们的预测表明，通过逐步向低碳管理过渡，PDWTRS到2040年前可实现净零排放，到2050年温室气体排放强度为-0.10千克二氧化碳当量/立方米。重要的是，该研究强调了在水资源短缺和气候变化背景下开发可持续再生水生产技术的重要性日益增加。该研究可提醒人们印染废水处理在纺织行业碳减排中的关键作用，并为PDWTRS实现碳中和的潜在途径提供路线图。
