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.
Enhanced primary treatment of concentrated black water and kitchen residues within DESAR concept using two types of anaerobic digesters
K. Kujawa-Roeleveld, T. Elmitwalli, G. Zeeman; Enhanced primary treatment of concentrated black water and kitchen residues within DESAR concept using two types of anaerobic digesters. Water Sci Technol 1 May 2006; 53 (9): 159–168. doi: https://doi.org/10.2166/wst.2006.265
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