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Assessment of optimum dilution ratio for biohydrogen production by anaerobic co-digestion of press mud with sewage and water
Authors:Radjaram B  Saravanane R
Institution:a Department of Civil Engineering, Pondicherry Engineering College, Puducherry 605 014, India
b Environmental Engineering Laboratory, Department of Civil Engineering, Pondicherry Engineering College, Puducherry 605 014, India
Abstract:Anaerobic co-digestion of press mud with water or sewage at ratios of 1:7.5, 1:10 and 1:12.5 were performed in continuously fed UASB reactors for hydrogen production. At a constant hydraulic retention time of 30 h, the specific hydrogen production rate was 187 mL/g volatile solids (VS) reduced during maximum biohydrogen production of 7960 mL/day at a 1:10 ratio of press mud to sewage. Chemical oxygen demand (COD) and VS reductions of 61% and 59% were noted on peak biohydrogen yield. A pH range of 5-6 was suitable at ambient temperature for entire process; a lower pH was inhibitory. Co-digestion of acidic press mud with sewage controlled pH for fermentation. Hence press mud can be exploited for biohydrogen production.
Keywords:Press mud  Sewage  UASB  Biohydrogen  Co-digestion
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