沼液浓缩肥料化利用是当前沼液高值化利用的重要途径,在养殖粪污厌氧沼液浓缩中因悬浮物含量过高导致膜使用寿命缩短、浓缩液盐分过高是限制其推广应用的两个主要原因.本研究采用三级过滤、混凝组合方法探索沼液去除悬浮物和盐分的预处理工艺,并通过对比实验优化其运行参数.实验表明:"三级过滤+混凝"处理可获得较好的盐分和悬浮物去除效果,其除去效率分别达到69.48 %、97.13 %,较"混凝+三级过滤"处理对盐分和悬浮物去除率分别高8.15 %、1.44 %;"三级过滤+混凝"处理的最佳运行参数:三级过滤滤速8 L/h,反冲洗时间间隔为9 h,混凝处理熟石灰、PAM投加量分别为13 mL/100 mL沼液、2 mL/100 mL沼液,最佳pH为8.8,最佳静置时间为30 min.%Biogas slurry enrichment and fertilizer utilization is an important way of high value utilization of biogas slurry. Due to the high suspended matter content in aquaculture sludge anaerobic biogas slurry, the service life of the membrane is shortened, and excessive salt concentration in the concentrate limits its application The two main reasons. In this study, the three-stage filtration and coagulation combination method were used to explore the pretreatment technology of removing suspended matter and salt from biogas slurry and optimizing the operating parameters through comparative experiments. The experimental results show that the removal efficiency of salt and suspended solids can be improved by "three-stage filtration + coagulation" treatment and the removal efficiencies reach 69.48 % and 97.13 % respectively. Compared with "coagulation + tertiary filtration" The removal rates were 8.15 % and 1.44 % respectively. The best operating parameters of "three-stage filtration + coagulation" treatment: three-stage filtration filtration speed 8 L/h back-washing time interval 9 h, coagulation lime, PAM dosage respectively 13 mL/100 mL biogas slurry, 2 mL/100 mL Biogas slurry, the best pH value of 8.8, the best standing time of 30 min.
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