Removal of Suspended Solids in Anaerobically Digested Slurries of Livestock and Poultry Manure by Coagulation Using Different Dosages of Polyaluminum Chloride

2016 International Conference on Environmental Engineering and Sustainable Development

生态环境科学;经济学

Li, P.^1 ; Zhang, C.J.^1 ; Zhao, T.K.^1 ; Zhong, H.^1

Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, No. 9 in Shuguang Garden Mid Road, Haidian District, Beijing, China^1

关键词: After-treatment;    Coagulant dosage;    Coagulation sedimentation;    Irrigation water quality;    Polyaluminum chloride;    Reference values;    Standard values;    Suspended solids;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/51/1/012008/pdf
DOI  :  10.1088/1742-6596/51/1/012008

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In this study, anaerobically digested slurries of livestock and poultry manure were pretreated by coagulation-sedimentation using an inorganic polymer coagulant, polyaluminum chloride (PAC). The effect of different PAC dosages on suspended solids (SS) removal and pH in the biogas slurries was assessed to provide reference values for reducing the organic load of biogas slurry in the coagulation-sedimentation process and explore the feasibility of reducing the difficulty in subsequent utilization or processing of biogas slurry. The results showed that for the pig slurry containing approximately 5000 mg/L SS, the removal rate of SS reached up to 81.6% with the coagulant dosage of 0.28 g/L PAC. For the chicken slurry containing approximately 2600 mg/L SS, the removal rate of SS was 30.2% with the coagulant dosage of 0.33 g/L PAC. The removal rate of SS in both slurries of livestock and poultry manure exhibited a downward trend with high PAC dosage. Therefore, there is a need to control the PAC dosage in practical use. The pH changed little in the two types of biogas slurries after treatment with different PAC dosages and both were in line with the standard values specified in the "Standards for Irrigation Water Quality".