热水解处理对高含固率污泥物化特性的影响

doi:10.19741/j.issn.1673-4831.2020.0027

摘要/Abstract

摘要： 为探究热水解预处理对高含固率污泥物化特性及有机物迁移特性的影响，于室内利用小型热水解反应釜模拟污泥水解试验，研究热水解处理对高含固率污泥的黏度、比阻、导热系数等物理特性及COD、SS和VSS溶出速率等有机物迁移特性的影响。结果表明：在190℃、50 min条件下热水解处理含固率为9%的城市污泥后，其导热系数提高15%左右，黏度与比阻则降低99.5%左右。在170℃、30 min热水解处理条件下，污泥的COD、SS和VSS溶出率分别为40%、35%及70%左右。热水解处理可改善污泥的物理性质，易于进行后续处理；污泥中的COD也从固相转移到液相，提高了污泥的厌氧消化性能。VSS溶解动力学模型表明污泥VSS在热水解过程中的溶解符合一级反应动力学模型，反应常数（K）与污泥含固率呈线性正相关（R²=0.990 9，P<0.01）。

关键词: 高含固率, 污泥, 热水解, 物理性质, 有机物迁移

Abstract: In order to explore the physicochemical characteristics and organic matter migration characteristics of thermal hydrolysis pretreatment on high solids sludge, a small thermal hydrolysis reactor was used to simulate the sludge hydrolysis test indoors, and the viscosity of thermal hydrolysis treatment on high solids sludge. Specific resistance, thermal conductivity and other physical characteristics and the influence of organic matter migration characteristics such as COD dissolution rate, SS dissolution rate and VSS dissolution rate was studied. Results show that after thermal hydrolysis treatment of urban sludge with solids content of 9% at 190 ℃ and 50 min, the thermal conductivity was increased by about 15%, and the viscosity and specific resistance were reduced by about 99.5%. The COD dissolution rate, SS dissolution rate, and VSS dissolution rate of the sludge were about 40%, 35%, and 70% under the conditions of 170 ℃ and 30 min thermal hydrolysis treatment, respectively. Thermal hydrolysis treatment can improve the physical properties of sludge for facilitating subsequent treatment; the COD in the sludge was also transferred from the solid phase to the liquid phase, which improved the anaerobic digestion performance of the sludge. During the thermal hydrolysis of the sludge, the kinetic model of the organic matter showed that the dissolution of the VSS in the thermal hydrolysis process was in line with the first-order reaction kinetic model by R²=0.990 9, P<0.01.

Key words: high solid content, sludge, thermal hydrolysis, physical properties, organic matter migration

中图分类号:

X592

王玺玉, 葛仕福, 程海磊. 热水解处理对高含固率污泥物化特性的影响[J]. 生态与农村环境学报, 2020, 36(10): 1362-1368.

WANG Xi-yu, GE Shi-fu, CHENG Hai-lei. Effect of Thermal Hydrolysis on Physicochemical Properties of High Solid Sludge[J]. Journal of Ecology and Rural Environment, 2020, 36(10): 1362-1368.

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