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

Author:

Liu Xiao Ling1,Wang Meng Meng1,Hu Xue Jing1,Song Yong Hui1

Affiliation:

1. Chinese Research Academy of Environmental Sciences

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-1for PO43-P and 1288 mg·L-1for 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-1and 16.1% with 48% reduction of volatile solids and 40% reduction of total solids after anaerobic digestion.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

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