Anaerobic immobilized mixed microbial cells for treatment of low strength wastewater: Effects of organic strength and hydraulic retention time
Journal
Journal of the Chinese Institute of Civil and Hydraulic Engineering
Journal Volume
29
Journal Issue
1
Pages
1-6
Date Issued
2017
Author(s)
Abstract
The immobilized anaerobes in bio-plates were installed in a single-pass reactor to overcome the challenges on treating low-strength wastewaters. This bio-immobilization technique is to overcome the issue of biomass washing-out in anaerobic treatment unit during very low hydraulic retention time (HRT). The anaerobic immobilized mixed microbial cells (AnIMMC) reactor removed 81% ~ 96% of COD from a synthetic wastewater at varied strengths (COD of 200 ~ 700 mg/L) and hydraulic retention times (HRT: 4 ~ 12 h), achieving COD removal by 81% from 200 to 40 mg/L of COD at HRT of 4 h. At 4 h HRT, gaseous CH4 content was 39% and gaseous CH4 was produced at 0.05 L of CH4/g of COD removed, corresponding to a 34% yield (gaseous and dissolved CH4) relative to the theoretical COD-to-CH4 conversion. Higher COD feeds increased CH4 yield to 64%, indicating stable treatment performance of the reactor that promised viable treatment of low-strength wastewaters at a short contact time. This anaerobic immobilized mixed microbial cell provides huge energy saving in comparison to tradition activated sludge method in treating domestic wastewaters.
Publisher
Chinese Institute of Civil and Hydraulic Engineering
Type
journal article