Comparison of Three Systems for Biological Greywater Treatment

Water

Luc໚ Hernández Leal²  Hardy Temmink²  Grietje Zeeman¹ 

[1] Sub-department Environmental Technology, Wageningen University, P.O. Box 8129, 6700EV Wageningen, The Netherlands;Wetsus, Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900CC, Leeuwarden, The Netherlands

关键词: aerobic treatment;    anaerobic treatment;    greywater;    surfactants;    sludge yield;   

DOI  :  10.3390/w2020155

来源: mdpi

【 摘 要 】

Greywater consists of household wastewater excluding toilet discharges. Three systems were compared for the biological treatment of greywater at a similar hydraulic retention time of approximately 12–13 hours. These systems were aerobic treatment in a sequencing batch reactor, anaerobic treatment in an up-flow anaerobic blanket reactor and combined anaerobic-aerobic treatment (up-flow anaerobic blanket reactor + sequencing batch reactor). Aerobic conditions resulted in a COD removal of 90%, which was significantly higher than 51% removal by anaerobic treatment. The low removal in the anaerobic reactor may have been caused by high concentration of anionic surfactants in the influent (43.5 mg/L) and a poor removal of the colloidal fraction of the COD in up-flow anaerobic sludge blanket reactors. Combined aerobic-anaerobic treatment accomplished a COD removal of 89%, similar to the aerobic treatment alone. Greywater methanization was 32% for the anaerobic system and 25% for the anaerobic-aerobic system, yielding a small amount of energy. Therefore, anaerobic pre-treatment is not feasible and an aerobic system is preferred for the treatment of greywater.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.