化学调质及固结作用下市政污泥水分转化规律研究
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1.南京水利科学研究院岩土工程研究所;2.河海大学 岩土力学与堤坝工程教育部重点实验室

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TU411.5

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化学调质对市政污泥排水固结特性的促进机理研究


Study on Moisture Transformation of Municipal Sludge under Chemical Conditioning and Consolidation
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1.Institute of Geotechnical Engineering,Nanjing Institute of Hydraulic Sciences;2.Key Laboratory of Geomechanics and Dam Engineering,Ministry of Education,Hohai University

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    摘要:

    市政污泥的排水固结特性与其水分赋存形式密切相关,然而目前对化学调质及固结作用后市政污泥水分转化规律的认识不足。本文结合土壤科学理论,采用离心机法测试不同类型市政污泥的土水势曲线,并根据土水势范围将市政污泥水分形式划分为结合水、毛细水和重力水。在此基础上比较原泥、固结试样、调质污泥试样中不同形式水分含量,分别揭示市政污泥在固结和化学调质作用下的水分转化规律。研究结果表明:污泥经10%氯化铁、10%氯化铝化学调质后,结合水含量降低70%~80%,自由水含量提升1倍。不同类型市政污泥在3.1kPa固结压力作用下,基本只排出部分重力水,毛细水和结合水含量基本不变;在100kPa固结压力作用下,重力水全部排干,毛细水明显减少,结合水小幅减少。

    Abstract:

    The drainage consolidation characteristics of municipal sludge are closely related to its water occurrence form. However, there is insufficient understanding of the water transformation law of municipal sludge after chemical conditioning and consolidation. Based on the theory of soil science, the soil-water potential curves of different types of municipal sludge were tested by centrifuge method, and the water forms of municipal sludge were divided into bound water, capillary water and gravitational water according to the range of soil-water potential. On this basis, the different forms of water content in the original sludge, consolidated samples and conditioned sludge samples were compared to reveal the water transformation law of municipal sludge under the action of consolidation and chemical conditioning. The results showed that the bound water content of the sludge was reduced by 70% ~ 80% and the free water content was doubled after the sludge was modified by ionic salt. Under the consolidation pressure of 3.1 kPa, only a part of gravity water was discharged from different types of municipal sludge, and the contents of capillary water and bound water were basically unchanged; under the consolidation pressure of 100 kPa, the gravity water was completely discharged, the capillary water was significantly reduced, and the bound water was slightly reduced.

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占鑫杰,吕冲,桂书润,等. 化学调质及固结作用下市政污泥水分转化规律研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-08
  • 最后修改日期:2024-06-18
  • 录用日期:2024-07-09
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