title: Sewage sludge disintegration by combined treatment of alkaline+high pressure homogenization.
abstract: Alkaline pretreatment combined with high pressure homogenization (HPH) was applied to promote sewage sludge disintegration. For sewage sludge with a total solid content of 1.82%, sludge disintegration degree (DD(COD)) with combined treatment was higher than the sum of DD(COD) with single alkaline and single HPH treatment. NaOH dosage ⩽0.04mol/L, homogenization pressure ⩽60MPa and a single homogenization cycle were the suitable conditions for combined sludge treatment. The combined sludge treatment showed a maximum DD(COD) of 59.26%. By regression analysis, the combined sludge disintegration model was established as 11-DD(COD)=0.713C(0.334)P(0.234)N(0.119), showing that the effect of operating parameters on sludge disintegration followed the order: NaOH dosage>homogenization pressure>number of homogenization cycle. The energy efficiency with combined sludge treatment significantly increased compared with that with single HPH treatment, and the high energy efficiency was achieved at low homogenization pressure with a single homogenization cycle.
authors.affiliation: Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. zzyyxx0618@163.com
authors.forename: Yuxuan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Panyue
authors.initials: P
authors.lastname: Zhang
authors.forename: Guangming
authors.initials: G
authors.lastname: Zhang
authors.forename: Weifang
authors.initials: W
authors.lastname: Ma
authors.forename: Hao
authors.initials: H
authors.lastname: Wu
authors.forename: Boqiang
authors.initials: B
authors.lastname: Ma
mesh_terms: D057919:Biological Oxygen Demand Analysis; D001709:Biotechnology / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D011312:Pressure; D012722:Sewage / Q000737:chemistry*; D012972:Sodium Hydroxide / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D012722:Sewage; D012972:Sodium Hydroxide