Premium
Anaerobic Co‐Digestion of Microalgae Scenedesmus sp. and TWAS for Biomethane Production
Author(s) -
Garoma Temesgen,
Nguyen Don
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143015x14362865227472
Subject(s) - alkalinity , anaerobic digestion , chemical oxygen demand , scenedesmus , chemistry , biogas , anaerobic exercise , pulp and paper industry , total dissolved solids , biogas production , volatile suspended solids , biofuel , environmental science , environmental chemistry , wastewater , environmental engineering , botany , algae , biology , ecology , methane , physiology , organic chemistry , engineering
The paper investigated the feasibility of biomethane (bio‐CH 4 ) production from the anaerobic co‐digestion of the microalgae Scenedesmus quadricauda ( S. quadricauda ) and thickened waste activated sludge (TWAS). The concept was tested in bench‐scale anaerobic digesters by varying the proportions of volatile solids (VS) loading from S. quadricauda and TWAS and two critical operational parameters, temperature and alkalinity. The CH 4 production for the various S. quadricauda and TWAS proportions ranged from 234 to 318 mL/g of chemical oxygen demand (COD) digested and 329 to 530 mL/g of VS digested at 35 °C. The reductions in total solids (TS), COD, and VS ranged from 25 to 44%, 46 to 53%, and 40 to 53%, respectively. Temperature had a significant effect on CH 4 production, lower temperatures greatly reduced CH 4 production. No significant difference in CH 4 production was observed for experiments conducted at alkalinity levels of 70, 1630, and 3200 mg/L as CaCO 3 .