Abstract：
:A new pre-treatment process for excess sludge is proposed to increase methane production and recover phosphorus by adding waste plaster board as calcium sulfate. The content of calcium sulfate in the plaster granules (PG) used in this study is 99%. When PG and calcium sulfate are added to the excess sludge generated from a municipal wastewater treatment plant, acetate production is enhanced as per sulfate reduction and phosphorus release is reduced via the formation of calcium phosphate. In the continuous pre-treatment experiment performed at 25 °C and for 10 days of sludge retention time (SRT) using calcium sulfate, 1935 ± 395 mg/L of acetate is produced with 1070 ± 255 mg/L of sulfate, which is reduced. Desulfobulbus spp., which can oxidize organic matter to acetate incompletely, have been observed in the pre-treated sludge. The pre-treated sludge has subsequently been used for methophiric anaerobic digestion. The methane yield from the pre-treated sludge is found to be 1.2 times that of the non-pretreated sludge at an SRT of 30 days, indicating that the pre-treatment using PG can improve methane production. Phosphorus is released from the non-pretreated sludge in the digester. Nevertheless, a decrease in phosphorus content has been observed, resulting in the digested sludge containing calcium phosphate that is useful for agriculture.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Kanazawa S,Matsuura N,Honda R,Yamamoto-Ikemoto Rdoi
10.1016/j.jenvman.2019.109844subject
Has Abstractpub_date
2020-02-01 00:00:00pages
109844eissn
0301-4797issn
1095-8630pii
S0301-4797(19)31562-2journal_volume
255pub_type
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