Aerobic digestion efficiency for mixed sludge (primary and secondary) of West Ahvaz wastewater Treatment plant in Batch reactor

authors:

avatar Abdalkazem Neisi 1 , avatar Kaream Kotienne Cheraghi 2 , avatar Amirhussam Hasssni 3

Department of Environmental Health Engineering and Center for Environmental Research technologies, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, IR Iran
Environmental Engineering (Water and Sewer), Ahvaz Water and Wastewater Department, Ahvaz, IR Iran
Department of Environmental Engineering, Islamic Azad University, Tehran Research & Sciences Branch, Ahvaz, IR Iran
Warning: No corresponding author defined!
Jundishapur Journal of Health Sciences: Vol.5, issue 2; e26851
published online: June 21, 2013
article type: Research Article

how to cite: Neisi A, Kotienne Cheraghi K, Hasssni A. Aerobic digestion efficiency for mixed sludge (primary and secondary) of West Ahvaz wastewater Treatment plant in Batch reactor. Jundishapur J Health Sci. 2013;5(2):e26851. 

Abstract

To stabilize organic matter of sludge, aerobic digestion is commonly applied for small wastewater treatment plants (0.2 m3/s), but recently it has also been used for large scale wastewater treatment plants. Digested sludge is readily dewatering and for use in agriculture.
Aim of this Bench scale study is determination of aerobic digestion performance for mixed sludge of west Ahwaz sewage treatment plant by batch reactor. In this study cubic glacial bioreactor with (331521) dimensions has been used. Then 7 liter of mixed sludge (3L from primary and 4 Lfrom secondary sludge) loaded. Aeration was carried out in 25 day by aquarium aerators.COD, VSS, TVS, TSS, TS,OUR tests examined in bioreactor.
Results showed that after 12 days 38% of TVS reduced. This meets the environmental standards. After 19 days detention time in the bioreactor, COD, VSS, TVS, TSS, TS, were 40 ,56, 54.5 ,50.4 ,44.7 percent respectively. Kd coefficient was,0.173day-1.
aerobic digestion was useful for mixed sludge of west Ahwaz sewage treatment plant.
To stabilize organic matter of sludge, aerobic digestion is commonly applied for small wastewater treatment plants (0.2 m3/s), but recently it has also been used for large scale wastewater treatment plants. Digested sludge is readily dewatering and for use in agriculture.
Aim of this Bench scale study is determination of aerobic digestion performance for mixed sludge of west Ahwaz sewage treatment plant by batch reactor. In this study cubic glacial bioreactor with (331521) dimensions has been used. Then 7 liter of mixed sludge (3L from primary and 4 Lfrom secondary sludge) loaded. Aeration was carried out in 25 day by aquarium aerators.COD, VSS, TVS, TSS, TS,OUR tests examined in bioreactor.
Results showed that after 12 days 38% of TVS reduced. This meets the environmental standards. After 19 days detention time in the bioreactor, COD, VSS, TVS, TSS, TS, were 40 ,56, 54.5 ,50.4 ,44.7 percent respectively. Kd coefficient was,0.173day-1.
aerobic digestion was useful for mixed sludge of west Ahwaz sewage treatment plant.

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