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.
污泥热水解过程中磷的释放规律与影响因素
- Title:
- Phosphate Release and Influencing Factors Analysis during Sludge Thermal Hydrolysis
- 文章编号:
- 1000-4602(2018)21-0024-07
- 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.
参考文献/References:
［1］Cordell D,Drangert J O,White S. The story of phosphorus: Global food security and food for thought［J］. Global Environmental Change,2009,19(2):292-305.
［2］Rittmann B E,Mayer B,Westerhoff P,?et al?. Capturing the lost phosphorus［J］. Chemosphere,2011,84(6):846-853.
［3］Wu L,Zhang C,Hu H,?et al?. Phosphorus and short?chain fatty acids recovery from waste activated sludge by anaerobic fermentation:Effect of acid or alkali pretreatment［J］. Bioresour Technol,2017,240:192-196.
［4］Yuan Z,Pratt S,Batstone D J. Phosphorus recovery from wastewater through microbial processes［J］. Current Opinion in Biotechnology,2012,23(6):878-883.
［5］Shu L,Schneider P,Jegatheesan V,?et al?. An economic evaluation of phosphorus recovery as struvite from digester supernatant［J］. Bioresour Technol,2006,97(17):2211-2216.
［6］Wu Q,Bishop P L. Enhancing struvite crystallization from anaerobic supernatant［J］. Journal of Environmental Engineering & Science,2015,89(3):21-29.
［7］Cloete T E,Oosthuizen D J. The role of extracellular exopolymers in the removal of phosphorus from activated sludge［J］. Water Res,2001,35(15):3595-3598.
［8］Zou J,Li Y. Anaerobic fermentation combined with low?temperature thermal pretreatment for phosphorus?accumulating granular sludge:Release of carbon source and phosphorus as well as hydrogen production potential［J］. Bioresour Technol,2016,218:18-26.
［9］Steckenmesser D,Vogel C,Adam C,?et al?. Effect of various types of thermochemical processing of sewage sludges on phosphorus speciation,solubility,and fertilization performance［J］. Waste Manage,2017,62:194-203.
［10］Val del Rio A,Morales N,Isanta E,?et al?. Thermal pre?treatment of aerobic granular sludge:impact on anaerobic biodegradability［J］. Water Res,2011,45(18):6011-6020.
［11］薛涛,黄霞,郝王娟. 剩余污泥热处理过程中磷、氮和有机碳的释放特性［J］. 中国给水排水,2006,22(23):22-25.? Xue Tao,Huang Xia,Hao Wangjuan. Characteristics of phosphorus,nitrogen and total organic carbon release in thermal excess sludge treatment process［J］. China Water & Wastewater,2006,22(23):22-25(in Chinese).
［12］Zhang M Y,Kuba T. Inhibitory effect of metal ions on the poly?phosphate release from sewage sludge during thermal treatment［J］. Environ Technol,2014,35(9/12):1157-1162.
［13］Xu Y,Hu H,Liu J,?et al?. pH dependent phosphorus release from waste activated sludge:contributions of phosphorus speciation［J］. Chemical Engineering Journal,2015,267:260-265.
［14］Ruban V,López?Sánchez J F,Pardo P,?et al?. Harmonized protocol and certified reference material for the determination of extractable contents of phosphorus in freshwater sediments—a synthesis of recent works［J］. Fresenius Journal of Analytical Chemistry,2001,370(2/3):224-228.
［15］程振敏,魏源送,刘俊新. 酸碱预处理对常压微波辐射剩余活性污泥磷释放的影响［J］. 环境科学,2009,30(4):1110-1114.? Cheng Zhenmin,Wei Yuansong,Liu Junxin. Effect of acid and alkali on phosphorus release from sewage sludge in the microwave treatment process［J］. Environmental Science,2009,30(4):1110-1114(in Chinese).
［16］Weiler R R. Rate of loss of ammonia from water to the atmosphere［J］. Journal of the Fisheries Research Board of Canada,2011,36(6):685-689.
［17］陶飞飞,田晴,李方,等. 共存杂质对磷酸铵镁结晶法回收磷的影响研究［J］. 环境工程学报,2011,5(11):2437-2441.? Tao Feifei,Tian Qing,Li Fang,?et al?. Effects of coexisting impurities on phosphorus recovery in magnesium ammonium phosphate crystallization［J］. Chinese Journal of Environmental Engineering,2011,5(11):2437-2441(in Chinese).
［18］许德超,周礼杰,尹魁浩,等. 低温热碱破解低有机质污泥及磷形态分析［J］. 环境工程学报,2017,11(10):5621-5629.? Xu Dechao，Zhou Lijie，Yin Kuihao,?et al?. Disintegration and phosphorus forms of alkaline pretreatment with low?temperature heating for low?organic sludge［J］. Chinese Journal of Environmental Engineering,2017,11(10):5621-5629(in Chinese).
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
来源： http://zggsps.paperonce.org/oa/DArticle.aspx?type=view&id=201821005
