Affiliation:
1. Environmental Engineering Group, Civil Engineering Department, Indian Institute of Technology Roorkee (IITR), Roorkee Uttrakhand 247667, India
2. Kuraray India Private Limited, New Delhi 110017, India
Abstract
In this study, the effectiveness of polyvinyl alcohol (PVA) gel beads in treating domestic wastewater was investigated: a moving bed biofilm reactor (MBBR) configuration (oxic-anoxic and oxic) with 10% filling fraction of biomass carriers was operated in a continuously fed regime at temperatures of 25, 20, 15 and 6 °C with hydraulic retention times (HRTs) of 32 h, 18 h, 12 h and 9 h, respectively. Influent loadings were in the range of 0.22–1.22 kg N m−3 d−1 (total nitrogen (TN)), 1.48–7.82 kg chemical oxygen demand (COD) m−3 d−1 (organic) and 0.12–0.89 kg NH4+-N m−3d−1 (ammonia nitrogen). MBBR performance resulted in the maximum TN removal rate of 1.22 kg N m−3 d−1 when the temperature and HRT were 6 °C and 9 h, respectively. The carbon removal rate at this temperature and HRT was 6.82 kg COD m−3 d−1. Ammonium removal rates ranged from 0.13 to 0.75 kg NH4+-N m−3 d−1 during the study. Total phosphorus and suspended solid removal efficiency ranged from 84 to 98% and 85 to 94% at an influent concentration of 3.3–7.1 mg/L and 74–356 mg/L, respectively. The sludge wasted from the MBBR exhibited light weight features characterized by sludge volume index value of 185 mL/g. Experimental data obtained can be useful in further developing the concept of PVA gel based wastewater treatment systems.
Subject
Water Science and Technology,Environmental Engineering
Cited by
28 articles.
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