[1]徐志嫱,李瑶,周爱朝,等.污泥热水解过程中磷的释放规律与影响因素[J].中国给水排水,2018,34(21):24-30.
　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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污泥热水解过程中磷的释放规律与影响因素

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第34卷 期数: 2018年21期 页码: 24-30 栏目: 论述与研究 出版日期: 2018-10-20
Title:
Phosphate Release and Influencing Factors Analysis during Sludge Thermal Hydrolysis
文章编号:
1000-4602(2018)21-0024-07
作者:
徐志嫱1，李瑶1，周爱朝1，姚宸朕1，2，刘荣荣1
(1.西安理工大学陕西省西北旱区生态水利工程重点实验室，陕西西安710048；2.中节能 工业水务工程有限公司，陕西西安710048)
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)
关键词:
剩余污泥; 热水解; pH值; 磷释放; 影响因素
Keywords:
excess sludge; thermal hydrolysis; pH; phosphorus release; influencing factor
分类号:
TU992
文献标志码:
A
摘要:
剩余污泥中富含磷物质，具有较大的回收利用价值。从污泥中高效回收磷最重要的步骤是将磷尽可能地释放到溶液中。以含固率为5%的剩余污泥（干污泥中磷占比为1.1%）为研究对象，进行了热水解磷释放规律研究。结果显示：当采用低温水解与投加酸联合处理剩余污泥时，污泥絮体被破坏，磷的释放量显著增加。当温度为75 ℃、加热时间为1 h、pH值为3时，TP和IP的释放量可达到最大，分别为311.9 mg/L和293.8 mg/L，是原污泥液相中TP和IP含量的7.9倍和8.4倍。将经上述条件处理的污泥混合液在35 ℃下静置24 h，污泥液相中NH+4-N浓度由96.0 mg/L提高到318.7 mg/L，同时伴随着SCOD浓度的明显减小。因此，通过低温短时热水解联合酸处理可显著提高污泥中磷和氨氮的释放量，可为后续以鸟粪石沉淀法回收磷创造有利条件。
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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备注/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

更新日期/Last Update: 2018-11-01