How, Seow Wah and Ting, Choo Xiang and Yap, Jing Ying and Kwang, Ching Yi and Tan, Chee Keong and Yoochatchaval, Wilasinee and Syutsubo, Kazuaki and Chua, Adeline Seak May (2021) Effect of carbon-to-nitrogen ratio on high-rate nitrate removal in an upflow sludge blanket reactor for polluted raw water pre-treatment application. Sustainable Environment Research, 31 (1). ISSN 2468-2039, DOI https://doi.org/10.1186/s42834-021-00086-8.
Full text not available from this repository.Abstract
The drinking water treatment plants (DWTPs) in the developing countries urgently need an efficient pre-treatment for nitrate (NO3-) removal to cope with the increasing NO3- pollution in raw water. An upflow sludge blanket (USB) reactor applied for NO3- removal from domestic wastewater may be adopted by the DWTPs. However, studies on the optimal carbon-to-nitrogen ratio (C/N) and operation of USB reactor at short hydraulic retention times (HRT) for high-rate polluted raw water pre-treatment are lacking. In this study, we first investigated the optimal C/N for biological NO3- removal in a sequencing batch reactor (SBR). An USB reactor was then operated with the optimal C/N for pre-treating synthetic raw water contaminated with NO3- (40mgNL(-1)) to monitor the NO3- removal performance and to examine opportunities for reducing the HRT. After operating the SBR with designed C/N of 4, 3 and 2g C g(-1) N, we selected C/N of 3g C g(-1) N as the optimal ratio due to the lower carbon breakthrough and nitrite (NO2-) accumulation in the SBR. The USB reactor achieved complete NO3- and NO2- removal with a lower designed C/N of 2g C g(-1) N due to the longer sludge retention time when compared with that of SBR (10 d). The high specific denitrification rate (18.7 +/- 3.6mgNg(-1) mixed liquor volatile suspended solids h(-1)) suggested a possible HRT reduction to 36min. We successfully demonstrated an USB reactor for high-rate NO3- removal, which could be a promising technology for DWTPs to pre-treat raw water sources polluted with NO3-.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education Malaysia Fundamental Research Grant Scheme[FRGS/1/2017/TK02/UM/02/10], Ministry of Higher Education Malaysia Fundamental Research Grant Scheme[FP047-2017A] |
| Uncontrolled Keywords: | Denitrification;Hydraulic retention time;Nitrate contamination;Sequencing batch reactor;Sludge retention time |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General) T Technology > T Technology (General) |
| Divisions: | Faculty of Engineering |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 22 Jul 2022 02:12 |
| Last Modified: | 22 Jul 2022 02:12 |
| URI: | http://eprints.um.edu.my/id/eprint/33941 |
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