Abstract
In China, sewage sludge has the characteristics of poor dewatering performance, low organic content, and high heavy metal content. This would seriously hamper subsequent disposal processes of the sludge. In this study, a novel sludge pretreatment technology, Acidification combined Multistage Elutriation" (AME), was proposed to reduce sludge volume and improve sludge quality simultaneously. The results showed that AME pretreatment could reduce moisture content of sludge cake to 67.3%, increase dewatering rate of sludge by 84.5%, increase organic content of sludge by 10.3%, remove a considerable proportion of heavy metals from sludge, and recycle 40% of phosphorus from sludge. The main mechanism of the improvements is that AME removed 97% of EPS from sludge and promoted flocculation of tiny sludge particles. In conclusion, AME pretreatment can increase the dewatering efficiency of sewage sludge and improve the dewatered sludge cake qualities to meet the requirements of composting and incineration.
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