鸟粪石结晶法处理牛场沼液过程中磷形态转化

为了解鸟粪石结晶法处理牛场沼液过程中不同形态磷的转化规律,该文以奶牛场沼液为对象,进行鸟粪石（Mg NH4PO4·6H2O,MAP）结晶法除磷过程中磷形态转化的试验研究。将原沼液和在不同p H值（8.5、9.0、9.5）下经MAP沉淀法处理后的沼液离心分离成固液两部分,分别测定两相中不同形态磷含量。在明确原沼液中磷形态及含量的基础上分析鸟粪石结晶法处理沼液后分离的固相和液相中不同形态磷的含量变化,确定牛场沼液中参与鸟粪石结晶反应的主要磷形态及比例。试验表明,牛场沼液中参与鸟粪石结晶反应的主要为溶解性正磷酸盐（Ortho-P）和铁铝结合磷（Fe-P/Al-P）,两者占沼液总磷（total pho...

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Bibliographic Details
Published in农业工程学报 Vol. 32; no. 3; pp. 228 - 233
Main Author 李洪刚 陈玉成 肖广全 黄磊 杨志敏
Format Journal Article
LanguageChinese
Published 西南大学资源环境学院,重庆,400716%西南大学资源环境学院，重庆 400716 2016
重庆市农业资源与环境研究重点实验室，重庆 400716
Subjects
奶牛场沼液
形态转化
水污染控制
磷
结晶
鸟粪石
奶牛场沼液
cattle farm biogas slurry
struvite
form transformation
water pollution control
磷
水污染控制
crystallization
鸟粪石
结晶
形态转化
phosphorus
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2016.03.033

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Summary:为了解鸟粪石结晶法处理牛场沼液过程中不同形态磷的转化规律,该文以奶牛场沼液为对象,进行鸟粪石（Mg NH4PO4·6H2O,MAP）结晶法除磷过程中磷形态转化的试验研究。将原沼液和在不同p H值（8.5、9.0、9.5）下经MAP沉淀法处理后的沼液离心分离成固液两部分,分别测定两相中不同形态磷含量。在明确原沼液中磷形态及含量的基础上分析鸟粪石结晶法处理沼液后分离的固相和液相中不同形态磷的含量变化,确定牛场沼液中参与鸟粪石结晶反应的主要磷形态及比例。试验表明,牛场沼液中参与鸟粪石结晶反应的主要为溶解性正磷酸盐（Ortho-P）和铁铝结合磷（Fe-P/Al-P）,两者占沼液总磷（total phosphorus,TP）的29.39%。p H值=9.5时,沼液中磷发生鸟粪石结晶反应程度较高,此时（Ortho-P＋Na OH-P）去除率为80.84%,其中91.28%转化成鸟粪石,沉淀物中鸟粪石的质量分数达到10.96%。该研究明确了鸟粪石结晶法处理沼液过程中不同形态磷的转化规律,为优化反应条件促使沼液中磷向鸟粪石转移提供了依据。
Bibliography:Struvite （or MAP） crystallization is a promising method for removing and recovering phosphorus from wastewater such as biogas slurry which is a wastewater high in phosphorus content. In this research, we analyzed different forms of phosphorus in cattle farm biogas slurry and phosphorous transformation in cattle farm biogas slurry during struvite crystallization. The transformation processes under pH value of 8.5, 9.0 and 9.5 were respectively observed based on measurement of the P content in liquid and solid phases which was mainly magnesium ammonium phosphate （MAP） obtained by centrifugation. Struvite was determined by the following steps： 1） The solid was recovered by centrifugation after the crystallization; 2） It was then washed and dried repeatedly; 3） It was dissolved by 1 mol/L of HCI; 4） The ammonium was detected; 5） The amount of struvite was calculated based on each MgNH4PO3-6H20 molecule which contained one ammonium molecule only. Phosphorus of liquid phase was classified into particulate phosphoru
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.03.033