磷酸铵镁结晶法去除和回收养猪废水中营养元素的实验研究

第27卷第7期

2007年7月

环　境　科　学　学　报　Acta Scientiae Circu m stantiae

Vol .27,No .7Jul .,2007

基金项目:中国环境科学研究院科技创新基金(No .20042021);国家人事部留学人员科技择优项目(No .2004299);国家人事部高层次留学人才回国工作项目(No .200422005)

Supported by the I nnovati on Research Fund of Chinese Research Academy of Envir onmental Sciences (No .20042021),Selective 2Grant Pr ogra m for the Overseas Returned Scholars ofM inistry of Pers onnel of China (No .2004299)and Grant Pr ogra m for the H igh 2levelOverseas Returned Scholars ofM inistry of Pers onnel of China (No .200422005)

作者简介:袁鹏(1979—),女,助理研究员;3通讯作者(责任作者),E 2mail:s ongyh@craes .org .cn

B i ography:Y UAN Peng (1979—),female,research assistant;3Correspond i n g author ,E 2mail:s ongyh@craes .org .cn

袁鹏,宋永会,袁芳,等.2007.磷酸铵镁结晶法去除和回收养猪废水中营养元素的实验研究[J ].环境科学学报,27(7):1127-1134

Yuan P,Song Y H,Yuan F,et al .2007.Nutrient re moval and recovery fr om s wine wastewater by crystallizati on of magnesium a mmonium phos phate[J ].Acta Scientiae Circum stantiae,27(7):1127-1134

磷酸铵镁结晶法去除和回收养猪废水中营养元素的

实验研究

袁鹏,宋永会3

,袁芳,彭剑峰

中国环境科学研究院水污染控制技术研究室,北京100012

收稿日期:2006207227 修回日期:2007202213 录用日期:2007204205

摘要:以模拟养猪废水为处理对象,进行了磷酸铵镁结晶小试实验,考察了pH 值、NH +4、Mg 2+、Ca 2+和CO 2-3浓度对磷酸铵镁结晶反应的影

响;利用扫描电镜2能谱分析仪(SE M 2EDX )和X 射线衍射仪(XRD )对结晶产物进行了表征.结果表明,磷酸铵镁结晶反应的最佳pH 值范围为

9.5～10.5;随着NH +4与磷摩尔比的增加,磷的去除率增大;最佳的镁与磷的摩尔比为1.4∶1,过高的镁盐投加量对提高反应效率作用不明显;

Ca 2+的存在对磷酸铵镁结晶产物的晶形、纯度均产生干扰,当Ca 2+增至一定浓度时,反应将生成无定形的磷酸钙沉淀;CO 2-3的存在会降低磷

的去除率,但不影响磷酸铵镁的晶形与纯度.关键词:磷酸铵镁;结晶反应;磷回收;晶体形态

文章编号:025322468(2007)0721127208 中图分类号:X703 文献标识码:A

Nutr i en t rem ova l and recovery from sw i n e wa stewa ter by crysta lli za ti on of magnesi um amm on i u m phospha te

Y UAN Peng,S ONG Yonghui 3

,Y UAN Fang,PE NG J ianfeng

Laborat ory of W ater Polluti on Contr ol Technol ogy of Chinese Research Academy of Envir onmental Sciences,Beijing 100012Rece i ved 27July 2006; rece i ved in revised for m 13February 2007; accepted 5Ap ril 2007

Abstract:U sing synthetic s wine waste water,s mall 2scale batch experi m ents were carried out t o investigate the effects of pH,ammonium nitr ogen

concentrati on,magnesium (Mg )dosage,calcium (Ca )and carbonate (CO 2-3

)concentrati ons on magnesium a mmonium phos phate (MAP )crystallizati on .The mor phol ogy of the crystals obtained was observed with Scanning Electr on M icr oscopy with Energy D is persive X 2ray analysis (SE M 2EDX ),and the compositi on of the crystalswas analyzed by X 2rayD iffracti on (XRD ).The results show that the op ti m um pH value f orMAP crystallizati on is in the range of 9.5～10.5;the P re moval efficiency increases with the increase of N ∶P molar rati o;the op ti m um Mg ∶P molar rati o is 1.4∶1.Excessive Mg dosage does not have an obvi ous effect on the efficiency of MAP crystallizati on .The p resence of Ca disturbs the mor phol ogy and purity of the MAP

p r oduct .Amor phous calcium phos phate will for m when Ca reaches a high enough concentrati on .CO 2-3

affects P removal efficiency,but does not obvi ously affect the mor phol ogy and purity ofMAP .

Keywords:magnesium a mmonium phos phate (MAP );crystallizati on reacti on;phos phorus recovery;crystal mor phol ogy

1　引言(I ntr oducti on )

磷是一种重要的矿产资源和化工原料,在其参

与环境(包括岩石、土壤和水)、生物、人体循环的过

程中,成为造成环境污染的一种重要成分;同时,磷

资源不仅十分有限,而且单向流动、难以再生.近年来,西方发达国家对磷的可持续利用高度重视,如何提高磷的利用效率,减少其造成的污染,成为广