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Water 2014, 6(8), 2436-2448; doi:10.3390/w6082436

Improved Energy Recovery by Anaerobic Grey Water Sludge Treatment with Black Water

1
Wetsus, Centre of Excellence for Sustainable Water Technology, Oostergoweg 7, Leeuwarden 8911MA, The Netherlands
2
Sub-department Environmental Technology, Wageningen University, P.O. Box 17, Wageningen 6700AA, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 29 May 2014 / Revised: 22 July 2014 / Accepted: 23 July 2014 / Published: 13 August 2014
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Abstract

This study presents the potential of combining anaerobic grey water sludge treatment with black water in an up-flow anaerobic sludge blanket (UASB) reactor to improve energy recovery within source-separated sanitation concepts. Black water and the mixture of black water and grey water sludge were compared in terms of biochemical methane potential (BMP), UASB reactor performance, chemical oxygen demand (COD) mass balance and methanization. Grey water sludge treatment with black water increased the energy recovery by 23% in the UASB reactor compared to black water treatment. The increase in the energy recovery can cover the increased heat demand of the UASB reactor and the electricity demand of the grey water bioflocculation system with a surplus of 0.7 kWh/cap/y electricity and 14 MJ/cap/y heat. However, grey water sludge introduced more heavy metals in the excess sludge of the UASB reactor and might therefore hinder its soil application.
Keywords: energy recovery; anaerobic treatment; grey water sludge; black water; heavy metals energy recovery; anaerobic treatment; grey water sludge; black water; heavy metals
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Tervahauta, T.; Bryant, I.M.; Leal, L.H.; Buisman, C.J.N.; Zeeman, G. Improved Energy Recovery by Anaerobic Grey Water Sludge Treatment with Black Water. Water 2014, 6, 2436-2448.

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