养殖场厌氧消化沼液后处理技术研究进展

A Review of Anaerobic Digested Effluent Further Treatment on Livestock Farm

我国养殖场厌氧消化后的沼液多数不能就地消纳,成为制约养殖场沼气工程发展的主要因素。国内外对沼液后处理技术研究较多,研究中多采用不同预处理方式去除不溶性COD和SS,其中化学法、催化氧化及电化学法能去除部分TN和TP,以降低后续处理负荷,而化学法中沉淀物可用于制备缓释肥料。后处理技术中主要有以资源化利用为目的的蒸发浓缩和膜分离工艺,以回用或者排放为目的的A/O、SBBR、人工湿地等为主的生物处理法组合工艺。发展低能耗、低投入、高效率和资源利用的预处理方法及后处理技术,更利于养殖场沼液处理技术的推广和应用。

Anaerobic digested effluent of livestock farm can not be consumed on site in our country,which is the main restriction factor for development biogas slurry project. There are many researches in the world. In order to reduce the subsequent treatment load,a variety of pretreatment modes can be used to remove insoluble COD and SS in the biogas slurry. The chemical technique,talytic oxidation and electrochemical methods can also remove parts of TN and TP to reduce subsequent processing load,in which the chemical precipitates can produce the slow release fertilizer. And in the post-processing method,there are enrichment and membrane separation technologies for resource utilization,and there is also a combination process of biological treatment based on A/O,SBBR,artificial wetland and so on for the purpose of reusing or discharging.The combination of low energy consumption,low input,high efficiency and resource utilization with pretreatment technology is more conducive to the popularization and application of livestock farm biogas slurry treatment technology.