Premium
Anaerobic biological treatment of frozen seafood wastewater
Author(s) -
Sillapacharoenkul Boonsong,
Sinbuathong Nusara
Publication year - 2020
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13418
Subject(s) - chemical oxygen demand , acidogenesis , wastewater , anaerobic exercise , chemistry , salinity , biogas , pulp and paper industry , methane , anaerobic digestion , environmental science , waste management , environmental engineering , biology , engineering , physiology , ecology , organic chemistry
The effect of salinity was studied on the anaerobic treatment of raw, frozen seafood wastewater. A single‐stage of four organic loading rates (OLRs) ranging from 0.58 to 1.45 kg COD/m 3 .day and two stages of five OLRs in acidogenic reactors ranging from 0.29 to 2.31 kg chemical oxygen demand (COD)/m 3 .day were fed into laboratory‐scale bioreactors. The wastewater contained a COD of 1,735 mg/L with high salinity, sodium ion (Na + ) and nitrogen (N) contents of 8.63 parts per thousand 5,071, and 165 mg/L, respectively. In the single‐stage operation, the COD and total volatile solids (TVS) removal reached maxima of 55 and 63%, respectively, at 0.58 kg COD/m 3 .day. In the two‐stage operation, the COD and TVS removal were 65 and 70% at the most appropriate OLR of 1.16 kg COD/m 3 .day. At this OLR, the highest CH 4 content and CH 4 yield obtained were not satisfactory at 26.62% and 71 L (reported at standard temperature and pressure)/kg COD removed, respectively. For both types of operation, the biogas did not contain sufficient methane (CH 4 ) in all tests at all OLRs. The salts, Na + , and N at the levels in this study did not upset the organic removal efficiency but did adversely affect CH 4 production. Two‐stage anaerobic operation could not prevent toxicity due to the characteristics of this wastewater.