Highly collaborative of wasted activated sludge deconstruction and incineration gas utilization in the presence of nitrogen oxides

IF 10 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Cleaner Production Pub Date : 2025-02-06 DOI:10.1016/j.jclepro.2025.144927

Qiyuan Zheng , Zihan Zhu , Yanyan Guo , Xiupeng Jiang , Xu Xing , Wenbo Chen , Youcai Zhao , Ying Zhu , Tao Zhou , Bin Xu

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Abstract

With the rapid urbanization in China, the volume of urban sewage continues to increase, resulting in large quantities of waste activated sludge (WAS). Anaerobic digestion (AD) is a widely used method for stabilizing WAS, but its efficiency is often hindered by the limited degradability of sludge. Researches have identified free nitrous acid (FNA) as an effective pretreatment for enhancing WAS degradability, though its sources remain insufficiently explored. This study introduces a novel method for sludge pretreatment, harnessing nitrogen oxides (NO_x) from waste combustion as a source of FNA to facilitate highly efficient deconstruction of WAS and utilization of incineration gas. Key optimization pretreatment factors including NO_x oxidation ratio (50%), concentration (5000 ppm), aeration time (4 h), as well as pH (>6.8) and temperature (60 °C), were evaluated. Findings revealed that the soluble chemical oxygen demand (SCOD) of the NO_x pretreatment sludge was 2.47 times higher than that of the untreated sludge. The mechanism underlying the NO_x pretreatment involves conversion of NO_x into nitrite within the sludge, disrupting sludge cells and resulting in the production of biodegradable substrates, thereby improving AD for methane production. All the results demonstrate that the innovative and chemical-free pretreatment strategy has synchronization benefits of incineration gases reutilization and organic solid recovery, offering substantial environmental and economic benefits.

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在存在氮氧化物的情况下，废弃活性污泥的解构和焚烧气体的利用高度协同

随着中国城市化的快速发展，城市污水量不断增加，产生了大量的废活性污泥（WAS）。厌氧消化（AD）是一种广泛使用的稳定WAS的方法，但其效率往往受到污泥可降解性的限制。研究发现游离亚硝酸（FNA）是提高WAS可降解性的有效预处理，但其来源尚未充分探索。本研究介绍了一种新的污泥预处理方法，利用废物燃烧产生的氮氧化物（NOx）作为FNA的来源，促进WAS的高效分解和焚烧气体的利用。关键优化预处理因素包括NOx氧化比（50%）、浓度（5000ppm）、曝气时间（4h）、pH (>；6.8)和温度（60°C）。结果表明，NOx预处理污泥的可溶性化学需氧量（SCOD）是未处理污泥的2.47倍。NOx预处理的机制包括将NOx在污泥中转化为亚硝酸盐，破坏污泥细胞并产生可生物降解的底物，从而提高甲烷生产的AD。结果表明，创新的无化学品预处理策略具有焚烧气体再利用和有机固体回收的同步效益，具有可观的环境效益和经济效益。

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来源期刊

Journal of Cleaner Production 环境科学-工程：环境

CiteScore

20.40

自引率

9.00%

发文量

4720

审稿时长

111 days

期刊介绍： The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.