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Wastewater treatment performance and sludge reduction properties of a household wastewater treatment system combined with an aerobic sludge digestion unit

Paper ID Volume ID Publish Year Pages File Format Full-Text
35569 45096 2008 7 PDF Available
Title
Wastewater treatment performance and sludge reduction properties of a household wastewater treatment system combined with an aerobic sludge digestion unit
Abstract

On-site domestic wastewater treatment systems (Johkasous) have become popular in Japan and play an important role in controlling pollution of aquatic environments. Appropriate control of accumulated sludge is an important aspect of the use of these systems. With the goals of reducing sludge production and the total volume of the system, we developed and evaluated an experimental system. The total volume of the experimental (type I) system, which combined an aerobic sludge digester (ASD) with a wastewater treatment process, was 30% smaller than a conventional (type II) system. Both systems received the same domestic wastewater at a flow rate of 1.0 m3 day−1 and were operated for 1 year. The sludge reduction ratio for the ASD of the type I system was 76.0%. The sludge produced in the type I system during the 1-year test was 12.62 kg, and the sludge yield based on removed biological oxygen demand (BOD) was evaluated to be 0.181 kg SS (kg BOD)−1. These values were approximately 35% less than those of the type II system (19.73 kg and 0.277 kg SS (kg BOD)−1, respectively). Although BOD and suspended solids (SS) in the final effluent were slightly higher than those from the type II system, the system we proposed may enable downsizing of the system volume and easier management of excess sludge.

Keywords
Domestic wastewater treatment; On-site treatment; Household system; Sludge reduction; Aerobic digestion
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Wastewater treatment performance and sludge reduction properties of a household wastewater treatment system combined with an aerobic sludge digestion unit
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 43, Issue 7, July 2008, Pages 722–728
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us