XU Zhi qiang,LI Yao,ZHOU Ai chao,et al.Phosphate Release and Influencing Factors Analysis during Sludge Thermal Hydrolysis[J].China Water & Wastewater,2018,34(21):24-30.
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Phosphate Release and Influencing Factors Analysis during Sludge Thermal Hydrolysis

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第34卷 Number: 21 Page: 24-30 Column: Date of publication: 2018-10-20
Article number:
1000-4602(2018)21-0024-07
Author(s):
XU Zhi qiang1; LI Yao1; ZHOU Ai chao1; YAO Chen zhen1; 2; LIU Rong rong1
(1. State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area, Xi’an University of Technology, Xi’an 710048, China; 2. Energy Saving Industrial Water Engineering Co. Ltd.Xi’an 710048, China)
Keywords:
excess sludge; thermal hydrolysis; pH; phosphorus release; influencing factor
CLC:
TU992
Document code:
A
Abstract:
The phosphorus (P) in excess sludge (ES) produced by the sewage treatment plant has huge recycling value. The most important step of P recovery from the ES is to release as much P as possible into the solution. In this work, the ES with a solid content of 5% was used to study P release during the thermal hydrolysis. The results showed that when the ES was treated with lowtemperature and pretreated with acid, the floc of the sludge was destroyed, and the release of P increased significantly. When the temperature was 75 ℃ for 1 h, the release of the total P (TP)and dissolving inorganic P (IP) in the liquid phase of raw sludge reached the maximum level, 311.9 mg/L and 293.8 mg/L, respectively, and was increased by 7.9 times and 8.4 times compared with raw sludge. When the sludge mixture was allowed to stand for 24 h at 35 ℃, the concentration of ammonia nitrogen (NH+4-N) increased from 96.0 mg/L to 318.7 mg/L, accompanied by a significant decrease in the concentration of soluble chemical oxygen demand (SCOD).These results demonstrated that the combination of lowtemperature and shorttime thermal and acid pretreatment could significantly increase the P and NH+4-N release in the sludge, which created favorable conditions for P recovery by struvite precipitation.

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Memo

基金项目：陕西省教育厅重点项目（17JS103）作者简介：徐志嫱（1969- ），女，重庆人，博士，教授，主要从事污水再生利用与水生态修复技术研究。
E-mail:595269472@qq.com
收稿日期：2018-06-05

Last Update: 2018-11-01