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http://dx.doi.org/10.17663/JWR.2018.20.4.390

Analysis on effect of heavy metal and Retention time to nitrification using industrial wastewater  

Im, Jiyeol (Department of Civil Engineering, Seoul National University of Science and Technology)
Gil, Kyungik (Department of Civil Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of Wetlands Research / v.20, no.4, 2018 , pp. 390-397 More about this Journal
Abstract
The Municipal Wastewater Treatment Plant(MWTP), located industrial estate, has a problem of decreasing nitrification efficiency. In this research, it was analyzed that effect of heavy metals and retention time to nitrification based on operational result of laboratory scale reactors. And suggest improving MWTP operation method for increasing nitrification efficiency based on findings. According to operational result, laboratory scale reactor shows over 60% nitrification efficiency over hydraulic retention time(HRT) 0.5 day. However, the nitrification efficiency of S MWTP(high heavy metal concentration) sample was lower than that of A MWTP(low heavy metal concentration) sample in same operational condition. The main reason was heavy metals in industrial wastewater. This heavy metals was acted as inhibitor to nitrifier in reactors. So, activity of nitrifier was analyzed based on specific nitrification rate(SNR). The SNR of S MWTP sample shows 0.13 ~ 0.21 mg NH4/gMLSS/hr and that of A MWTP sample shows 0.74 mg NH4/gMLSS/hr. As a result, the activity of nitrifier of S MWTP was lower than that of A MWPT. In other words, retrofit methods for improving nitrification efficiency in MWTPs located industrial estate were that to increase retention time in biological treatment process or to pretreat heavy metal before being injected biological treatment process.
Keywords
Municipal wastewater treatment plant; Nitrification; Industrial wastewater; Heavy metal; SNR;
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