Effect of alkaline addition on anaerobic sludge digestion with combined pretreatment of alkaline and high pressure homogenization.
To improve anaerobic digestion efficiency, combination pretreatment of alkaline and high pressure homogenization was applied to pretreat sewage sludge. Effect of alkaline dosage on anaerobic sludge digestion was investigated in detail. SCOD of sludge supernatant significantly increased with the alkaline dosage increase after the combined pretreatment because of sludge disintegration. Organics were significantly degraded after the anaerobic digestion, and the maximal SCOD, TCOD and VS removal was 73.5%, 61.3% and 43.5%, respectively. Cumulative biogas production, methane content in biogas and biogas production rate obviously increased with the alkaline dosage increase. Considering both the biogas production and alkaline dosage, the optimal alkaline dosage was selected as 0.04 mol/L. Relationships between biogas production and sludge disintegration showed that the accumulative biogas was mainly enhanced by the sludge disintegration. The methane yield linearly increased with the DDCOD increase as Methane yield (ml/gVS)=4.66 DDCOD-9.69.
Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: fw8905@163.com.
Wei
W
Fang
Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: panyue_zhang@bjfu.edu.cn.
Panyue
P
Zhang
School of Environment and Resource, Renmin University of China, Beijing 100872, China; Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing 100084, China. Electronic address: zgm5000@126.com.
Guangming
G
Zhang
Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: shuguangjin@126.com.
Shuguang
S
Jin
Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: lidy@cnemc.cn.
Dongyi
D
Li
Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: 870068045@qq.com.
Meixia
M
Zhang
Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: xiangzhx@andrew.cmu.edu.
Xiangzhe
X
Xu
D000693:Anaerobiosis / Q000187:drug effects; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D006863:Hydrogen-Ion Concentration; D011312:Pressure; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000382:microbiology*; D012972:Sodium Hydroxide / Q000494:pharmacology*
D056804:Biofuels; D012722:Sewage; D012972:Sodium Hydroxide
Alkaline pretreatment; Biogas production; High pressure homogenization; Organic degradation; Sludge disintegration