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

Water

Taina Tervahauta¹  Isaac M. Bryant²  Luc໚ Hernández Leal¹  Cees J. N. Buisman¹ 

[1] Wetsus, Centre of Excellence for Sustainable Water Technology, Oostergoweg 7, Leeuwarden 8911MA, The Netherlands; E-Mails:;Sub-department Environmental Technology, Wageningen University, P.O. Box 17, Wageningen 6700AA, The Netherlands; E-Mails:

关键词: energy recovery;    anaerobic treatment;    grey water sludge;    black water;    heavy metals;   

DOI  :  10.3390/w6082436

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.