The effect of the sludge recycle ratio in an activated sludge system for the treatment of Amol's industrial park wastewater-Reference-Cited by-同舟云学术

The effect of the sludge recycle ratio in an activated sludge system for the treatment of Amol's industrial park wastewater

Published:2008 Issue:3 Volume:14 Page:173-180
ISSN:1451-9372
Container-title:Chemical Industry and Chemical Engineering Quarterly
language:en
Short-container-title:CI&CEQ

Author:

Hosseini Bahar¹,Darzi Najafpour²,Sadeghpour Maedeh¹,Asadi Mostafa¹

Affiliation:

1. School of Environmental Engineering, Faculty of Civil Engineering, Noushirvani, Babol University of Technology, Babol, Iran

2. Faculty of Chemical Engineering, Noushirvani, Babol University of Technology, Babol, Iran

Abstract

An activated sludge aeration tank and a sedimentation basin were used to treat Amol's industrial park effluents originating from all industrial units. A continuous system was implemented and the kinetic parameters were measured. The parameters such as rate constant, substrate utilization rate constant, yield and decay coefficient were 2.12 d-1, 232.4 mg l-1, 0.33 g/g of substrate and 0.096 d-1, respectively. The hydraulic retention times (HRT) were in the range of 9 to 27 h. The sludge recycle ratios in the range from 0.3 to 1 were considered. The COD removal, SVI and DO were determined and the optimal values were obtained. It was observed that at HRT of 16 h and the sludge recycle ratio of 0.85, the COD removal and SVI were 95 and 85 %, respectively. The sludge recycle ratio greater than 0.85 had no significant effect on the COD removal.

Publisher

National Library of Serbia

Subject

General Chemical Engineering

Reference18 articles.

1. Effect of organic loading on performance of rotating biological contactors using Palm Oil Mill effluents

2. Role of micronutrients in activated sludge-based biotreatment of industrial effluents

3. A new reactor concept for sludge reduction using aquatic worms

4. Biodegradability of activated sludge organics under anaerobic conditions

5. Development and application of a resazurin-based biomass activity test for activated sludge plant management

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