Sewage Sludge Valorization via Phytohormones Production: Parameter Regulation and Process Evaluation

IF 11.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2024-11-19 DOI:10.1016/j.watres.2024.122813

Shuxian Chen, Yu Hua, Qi Song, Xin Yuan, Junwei Yang, Yue Zhang, Xiaohu Dai

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Abstract

Sludge treatment is of great significance for environmental protection and sustainable development. Existing treatment technologies fall short in terms of carbon emissions, process efficiency, and resource recovery. This study focuses on alkaline hydrothermal treatment, proposing a short-cycle, low-energy, high-value management process for sludge valorization. Here, we investigate the impact of treatment duration, temperature, and solid content on the synthesis of high-value products and their effects on both solid and liquid phases. Based on the comprehensive results, 2 h, 160°C, and 14% solid content can be regarded as the optimized treatment condition. The resulting products, including phytohormones, humic substances, and essential nutrients (C, N, P and K), exhibit substantial potential for high-value agricultural utilization. In the unconcentrated solution, a single phytohormone can reach a concentration of 10⁴ μg/L. Heavy metal content is well below standard limits, simultaneously achieving biological stability, and the volume can be reduced to 60%. This process is 42.12 times more energy-efficient than conventional anaerobic digestion. This novel approach promotes waste resource recycling and sustainable urban management.

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通过植物激素生产实现污水污泥增值：参数调节和工艺评估

污泥处理对环境保护和可持续发展意义重大。现有的处理技术在碳排放、工艺效率和资源回收方面都存在不足。本研究以碱性水热处理为重点，提出了一种短周期、低能耗、高价值的污泥价值化管理工艺。在此，我们研究了处理时间、温度和固体含量对高价值产品合成的影响，以及它们对固相和液相的影响。根据综合结果，2 小时、160°C 和 14% 的固含量可视为最佳处理条件。由此产生的产品，包括植物激素、腐殖质和必需营养物质（C、N、P 和 K），在高价值农业利用方面具有巨大潜力。在未浓缩的溶液中，单一植物激素的浓度可达 104 微克/升。重金属含量远低于标准限值，同时实现了生物稳定性，体积可减少到 60%。该工艺的能效是传统厌氧消化工艺的 42.12 倍。这种新方法促进了废物资源循环利用和可持续城市管理。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.