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- Title
Improved Energy Recovery by Anaerobic Grey Water Sludge Treatment with Black Water.
- Authors
Tervahauta, Taina; Bryant, Isaac M.; Hernández Leal, Lucía; Buisman, Cees J. N.; Zeeman, Grietje
- 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.
- Subjects
WASTEWATER treatment; SEWAGE sludge precipitant recycling; SLUDGE management; WASTE products as fuel; HEAVY metals removal (Sewage purification)
- Publication
Water (20734441), 2014, Vol 6, Issue 8, p2436
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w6082436