| Literature DB >> 26409858 |
Jia Meng1, Jiuling Li1, Jianzheng Li2, Philip Antwi1, Kaiwen Deng1, Cheng Wang1, Gerardo Buelna3.
Abstract
An upflow microaerobic sludge reactor (UMSR) was constructed in treating manure-free piggery wastewater with high ammonium concentration and a COD/TN ratio as low as 0.84. The UMSR offered an outstanding removal of NH4(+)-N and TN at 35°C and hydraulic retention time 8h subsequent to inoculated sludge acclimation. A short NO2(-)-N accumulation phase was observed whenever there was a considerable increase in TN loading rate (NLR), but decreased rapidly along with an evident increase in TN removal. Fed with raw wastewater at a NLR of 1.10 kg/(m(3)d), the average COD, NH4(+)-N and TN removal reached 0.72, 0.76 and 0.94 kg/(m(3)d), respectively. Inference drawn from stoichiometry based on the potential nitrogen removal pathways and the C/N ratio required by denitrification indicated that anammox was the main mechanism for NH4(+)-N and TN removal in the UMSR.Entities:
Keywords: High ammonium; Low C/N ratio; Microaerobic process; Nitrogen removal; Piggery wastewater
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Year: 2015 PMID： 26409858 DOI： 10.1016/j.biortech.2015.09.023
Source DB: PubMed Journal: Bioresour Technol ISSN： 0960-8524 Impact factor: 9.642