Enhanced primary treatment of concentrated black water and kitchen residues within DESAR concept using two types of anaerobic digesters

K. Kujawa-Roeleveld, T.A. Elmitwalli, G. Zeeman

Research output: Contribution to journalArticleAcademicpeer-review

38 Citations (Scopus)

Abstract

Anaerobic digestion of concentrated domestic wastewater streams - black or brown water, and solid fraction of kitchen waste is considered as a core technology in a source separation based sanitation concept (DESAR - decentralised sanitation and reuse). A simple anaerobic digester can be implemented for an enhanced primary treatment or, in some situations, as a main treatment. Two reactor configurations were extensively studied; accumulation system (AC) and UASB septic tank at 15, 20 and 25°C. Due to long retention times in an AC reactor, far stabilisation of treated medium can be accomplished with methanisation up to 60%. The AC systems are the most suitable to apply when the volume of waste to be treated is minimal and when a direct reuse of a treated medium in agriculture is possible. Digested effluent contains both liquid and solids. In a UASB septic tank, efficient separation of solids and liquid is accomplished. The total COD removal was above 80% at 25°C. The effluent contains COD and nutrients, mainly in a soluble form. The frequency of excess sludge removal is low and sludge is well stabilised due to a long accumulation time
Original languageEnglish
Pages (from-to)159-168
JournalWater Science and Technology
Volume53
Issue number9
DOIs
Publication statusPublished - 2006

Keywords

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