YANGZao,LIYu,WANGJing-jing,et al.Heavy Metal Pollution Level of Rural Sewage Sludge in Shanghai and Its Nutrition Indicator Evaluation[J].China Water & Wastewater,2023,39(21):86-93.
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Heavy Metal Pollution Level of Rural Sewage Sludge in Shanghai and Its Nutrition Indicator Evaluation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第21期 Page: 86-93 Column: Date of publication: 2023-11-01
Author(s):
YANG　Zao1;  LI　Yu2;  WANG　Jing-jing1;  HU　Xin-ye2;  SHI　Zhen-bao3;  LI　Xin1;  LI　Huai-zheng1;  DONG　Bin1;  XU　Zu-xin1
（1. College of Environmental Science and Engineering， Tongji University， Shanghai 200092， China； 2. Shanghai Water Conservancy Management Center， Shanghai 200002， China； 3. Shanghai Bibo Water Design and Research Center， Shanghai 200233， China）
Keywords:
rural sewage sludge;  heavy metal pollution;  nutrition indicator;  ecological risk assessment
Abstract:
This paper collected 21 available samples from decentralized rural sewage treatment facilities operated stably in Shanghai, clarified the regional distribution characteristics of heavy metals and nutrient elements by ArcGIS, so as to understand the pollution characteristics of heavy metals in rural sewage sludge in Shanghai and its potential for resource utilization. The heavy metal pollution level and potential ecological risk of rural sewage sludge in Shanghai showed a decreasing trend from north to south. However, the heavy metal content met the class B sludge product pollutant limit specified in Control Standards of Pollutants in Sludge for Agricultural Use (GB 4284-2018) on the whole, indicating that the sludge could be safely used for resource utilization in land. Except Minhang District, the nitrogen, phosphorus and potassium contents of rural sewage sludge in other areas of Shanghai reached or was very close to the limits (30 g/kg) specified in Disposal of Sludge from Municipal Wastewater Treatment Plant—Quality of Sludge Used in Gardens or Parks (GB/T 23486-2009), and the sludge could be returned to local forest after stable treatment. The enrichment of Cu, Zn and Pb might come from livestock manure and traffic pollution, and it was speculated that Cd and As might originate from fertilization and industrial activities. This paper provided a reference for the study of the operation status of rural sewage treatment facilities in Shanghai, and built an important basis for the treatment of rural sludge and the formulation of relevant policies in Shanghai.
Last Update: 2023-11-01