Position: Home > Articles > Recovery of Nitrogen and Phosphorus from Biogas Slurry of Pig Manure-Straw Mixed Fermentation
China Biogas
2018
(03)
72-77
磷酸铵镁(MAP)结晶法回收粪污/秸秆混合发酵沼液中氮磷的特性研究
作 者：
黄彬;郭惠娟;毛林强;张文艺
单 位：
常州大学环境与安全工程学院
关键词：
分散式养猪场;沼液;MAP;回收氮磷
摘 要：
针对常州分散式养猪场沼液污染物浓度低、处理量大等特点,文章采用磷酸铵镁(MAP)结晶法对分散式养猪场沼液中氮磷的回收进行试验研究,通过投加一定量MgCl_2·6H_2O和Na_2HPO_4·12H_2O,探讨反应体系的pH值,反应时间,PO_4~(3-)/NH_4~+,Mg~(2+)/NH_4~+投配比等因素对MAP法结晶特性影响。结果表明,当温度为15℃~30℃时,其最佳结晶参数为:反应体系pH值9.5,反应时间30 min,PO_4~(3-)/Mg~(2+)/NH_4~+=1.2∶1.2∶1,该条件下COD,NH_4~+,PO_4~(3-)去除率分别可达33.33%,92.19%,97.89%。60 min之内,NH_4~+沉降动力学模型为lgd C dt=5.0175lg C-8.6954,NH_4~+等指标达到《畜禽养殖业污染物排放标准》(GB 18596-2001)浓度限值,且所投加的磷酸盐基本能结晶回收,无二次污染;XRD和SEM检测表明沉淀产物即为磷酸铵镁结晶体(Mg NH4PO4·6H_2O)。对于MAP法日处理500 t·d-1沼液年收益可达634.6万元。该研究可为分散式养猪场粪污/秸秆混合发酵沼液资源化利用提供理论参数及为沼液处理工程设计提供技术参数和工程调试参考,对我国广大农村地区分散式养猪场粪污处置有一定的参考价值。
译 名：
Recovery of Nitrogen and Phosphorus from Biogas Slurry of Pig Manure-Straw Mixed Fermentation
作 者：
HUANG Bin;GUO Hui-juan;MAO Lin-qiang;ZHANG Wen-yi;School of Environmental Safety Engineering,Changzhou University;
关键词：
distributed pig farms;;biogas slurry;;MAP;;recovery of nitrogen and phosphorus
摘 要：
In this paper,nitrogen and phosphorus were recovered as magnesium ammonium phosphate(MAP) from biogas slurry produced by distributed pig farm in Changzhou. A certain amount of MgCl_2·6 H_2O and Na_2HPO_4·12 H_2O were added to the system,and the effects of the pH value,reaction time,the adding ratio of PO_4~(3-)/Mg~(2+)/NH_4~+ were discussed.The results showed that,the best parameters of nitrogen and phosphorus recovery from the biogas slurry were: pH value of9. 5,reaction time of 30 min,and PO_4~(3-)/Mg~(2+)/NH_4~+ of 1. 2∶ 1. 2∶ 1,under these condition,the removal rate of COD,NH_4~+ and PO_4~(3-) were 33. 33%,92. 19% and 97. 89%. The kinetic model of NH_4~+ sedimentation within the 60 min was lgd Cdt=5. 0175 lg C-8. 6954. The NH_4~+ and other indicators reached the Emission Standard(GB 18596-2001). And the added phosphates are basically crystallized and recycled,there was no secondary pollution. XRD and SEM determination showed that the precipitated products was ammonium magnesium phosphate(MgNH_4PO_4·6 H_2O).
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