Pretreatment of urban wastewaters in a hydrolytic upflow digester

Abstract

Domestic wastewater was fed continuously to a laboratory-scale upflow digester operated at short hydraulic retention times (HRT < 4 h). The digester acts as a system for sedimentation and hydrolysis of suspended solids (SS) and for acidification of solubilised substances. 3 h. Over 60% SS are retained in the digester and hydrolysed. Average influent SS content is 230 mg/l, whereas effluent SS is 90 mg/l. Retention and hydrolysis of SS causes an increase in volatile fatty acid (VFA) concentration, from about 20 mg/ lin the influent to above 100 mg/ lin the effluent, also contributing toward soluble fraction acidification.

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