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畜禽粪便沼液絮凝预处理及MAP法磷回收技术

马泉智1’2,向连城1,宋永会h,冯传平2,钱锋1
1.中国环境科学研究院城市水环境科技创新基地,北京100012  2.中国地质大学(北京)水资源与环境学院,北京100083

摘要:分别选用无机絮凝剂聚合氯化铝(PAC)、硫酸铁(Fe2(SO4)3有机絮凝剂非离子聚丙烯酰胺(PAM)、阴离子聚丙烯酰胺(APAM)、阳离子聚丙烯酰胺(CPAM)对畜禽粪便沼液进行预处理,考察各物质投加量对悬浮物(ss)的去除效果。结果表明,CPAM对ss的去除效果最好,当沼液中的ss浓度为13 500 mg/L时,投加1.02 g/L(210 mL)的CPAM絮凝后,沼液中的ss浓度降为148 mg/L,SS去除率达98.9%。对絮凝后的水样(PO43--P浓度为35 mg/L左右)进行磷酸铵镁(MAP)结晶处理,结果发现,当Mg与P摩尔比为1:l,pH为9.5时PO43--P去除率最高;而当Mg与P摩尔比为1.5~2:1,pH为10.0时PO43--P去除率最高。扫描电镜(SEM)和x一射线衍射(XRD)分析表明,结晶产物为MAP。
    关键词:畜禽粪便沼液;絮凝;磷回收;磷酸铵镁(MAP)
    中图分类号:X703.1 文献标识码:A doi:10.3969/j.issn.1674-991X.2013.03.033

Technology Development of Flocculating Pretreatment of Livestock andPoultry Manure Slurry and of Phosphorus Recovery by MAP Crystallization
    MA Quan.zhil’2,XIANG Lian.cheng’,SONG Yong.huil,FENG Chuan—pin92,QIAN Fen91
    1.Innovation Base of Urban Water Environmental Research,Chinese Research Academy of Environmental Sciences,Beijing 100012,China2.School of Water Resources and Environment,China University of Geoscienees Beijing,Beijing 100083,China
    Abstract:Flocculation was applied to the pretreatment of livestock and poultry manure fermenting slurry.Inorganic flocculants such as aluminium polychloride(PAC)and ferric sulfate(Fe2(S04)3),organic flocculants such as nonionic polyacrylamide(PAM),anionic polyaerylamide(APAM)and polyaerylamide(CPAM)were tested to remove suspended solid(SS)from the liquor.The results showed that CPAM was more efficient for SS removal than other flocculants.At SS of 13 500 mg/L,a CPAM dosage of 1.02 g/L could lower the SS to 148 mg/L,reaching a removal efficiency of 98.9%.After the flocculating pretreatment,the P043。一P concentration was around 35 mg/L,and magnesium ammonium phosphate(MAP)crystallization process was used to recover phosphorus.It showed that at Mg:P molar ratio of 1:1,the optimum pH was 9.5,at which the phosphate removal efficiency Was the highest;while at Mg:P molar ratios of 1.5-2:1,the optimum pH was 10.0.Scanning electron microscope (SEM)and X-ray diffraction(XRD)were employed to detect and analyze the crystallized product,and it showedthat the product was MAP.
    Key words:livestock and poultry manure fermenting slurry;flocculation;phosphorus recovery;magnesiumammonium phosphate(MAP)

我国畜禽养殖业发展迅猛,集约化、规模化发展程度越来越大,畜禽养殖业大发展所带来的环境污染问题日益严重…。未经处理的畜禽粪便和废水直接排入环境,会对地表水、地下水、土壤和空气造成严重的污染,特别是粪便中的氮、磷会造成水体的富营养化。目前养殖废水普遍采用的处理技术为厌氧发酵产沼气处理工艺,畜禽粪便经过厌氧发酵后仍然含高浓度有机污染物、氨氮和磷。

畜禽粪便沼液絮凝预处理及MAP法磷回收技术

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