TITLE

Effect of Total Solids Content on the Biogas Production and Phosphorus Release from Excess Sludge

AUTHOR(S)
Xiaoling Liu; Mengmeng Wang; Xuejing Hu; Yonghui Song
PUB. DATE
August 2014
SOURCE
Advanced Materials Research;2014, Vol. 1010-1012, p1006
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Anaerobic digestion and struvite precipitation were the two effective ways to treat excess sludge for recovering the bioenergy (biogas) and phosphorus. The total solids content played an important role in the biogas production and the phosphorus release. The experimental results showed that cumulative biogas decreased significantly with the increase of total solids content from 5% to 10% but increased subsequently with a further increase of total solids content, and the maximal cumulative biogas was achieved at 5% of total solids. The concentrations of PO4³-P and total soluble P varied with total solids content, and the maximal concentrations were obtained under the condition of 20% of total solids, namely 1327 mg-L-1 for PO4³-P and 1288 mg-L-1 for total soluble P. Pearson's relationship analysis reflected that the released total soluble P was mainly composed of PO4³-P during the anaerobic digestion. Furthermore, the maximal yield of PO4³-P and the maximal solubilization ratio of total P were achieved at 15% of total solids, and they respectively reached 4.2 mg-g-1 and 16.1% with 48% reduction of volatile solids and 40% reduction of total solids after anaerobic digestion.
ACCESSION #
99604856

 

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