Combined coagulation and membrane treatment for anaerobically digested manure centrate: Contaminant residuals and membrane fouling

Abstract

To realize water and resource recovery from anaerobically digested manure centrate, the effect of combined coagulation and membrane treatment on contaminant residuals and membrane fouling was investigated. Two combined treatments were used to explore the properties of the retention of nutrients and the removal of risk pollutants. Behaviors and reversibility of membrane fouling after combined treatment were also examined. The result showed that the combined treatment significantly improved the water recovery rate by more than 60% and achieved better nutrient enrichment. Meanwhile, the combined treatment had certain removal effects on heavy metals and antibiotics, which promoted the safety of farmland utilization of anaerobically digested manure centrate. Moreover, the combined treatment reduced the membrane fouling by removing most suspended solids in the digested centrate. Combined coagulation and membrane treatment show great potential for practical applications in the treatment of anaerobically digested manure centrate due to the easy operation and excellent effect. This work provides a technical reference for the harmless and resource recovery of anaerobically digested manure centrate.

Keywords: Anaerobically digested manure centrate; Antibiotics; Coagulation; Heavy metal; Membrane fouling; Resource recovery.