沼液深度处理技术研究与应用现状

针对我国大中型沼气工程沼液产生量巨大,沼液还田无法广泛实施,而直接排放又会造成环境污染的问题,通过对大量的文献资料和研究结果进行分析,得出沼液处理的2种主要途径:①降解其中的污染物使其能够达标排放或安全回用,②浓缩并回收沼液中营养物,使沼液体积减量化。建议今后的研究应选择适合的工艺,克服技术难题,以沼液高效利用为目标,以防止环境污染为前提,探索低运行费用的沼液处理方法。

Present Status of Biogas Effluent Treatment Technology Research and Application

 There are huge amount of effluent produced from large and middle scale biogas plants in China. Thus it is very difficult to apply them to farmland. The direct discharge will bring severe pollution to environment. Based on the analysis on massive documents and research results, 2 approaches of biogas effluent treatments are obtained: ①degrading the pollutant to make it be discharged after reaching the standard or ②concentrating and recovering the nutrients from the anaerobic digestate, and reducing the effluent volume. It is suggested that the further research program should choose appropriate technology to overcome difficult problem, take high efficient utilization of biogas effluent as objective to prevent environmental pollution, and to explore low-cost methods for biogas effluent treatment.