Stable nitrification under sulfide supply in a sequencing batch reactor with a long fill period

Stable nitrification under sulfide supply in a sequencing batch reactor with a long fill period
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在长填充周期的序批式反应器中,在供应硫化物的情况下实现稳定硝化

DOI:
10.1016/j.jwpe.2018.05.012
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发表时间:
2018
影响因子:
7
通讯作者:
Tatsuki Toda
Tatsuki Toda
中科院分区:
工程技术2区
文献类型:
--
作者:
Mutsumi Sekine;Shinichi Akizuki;Masatoshi Kishi;Tatsuki Toda

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含氨废水通常还含有硫化物,其严重抑制生物硝化。在这项研究中,序批式反应器(SBR)的适用性与长的填充期,以实现稳定的硝化含硫化物厌氧消化废水进行了评估。在启动期间,其中不向反应器供应硫化物(阶段I,实验第0-18天),铵在第6天后稳定地氧化成硝酸盐。在以32 mg-S L-1d-1供给硫化物的期间(阶段II,实验第18-30天),硝化效率暂时下降到79%,但在两天内迅速恢复到100%。在启动期结束时,通过分批生物测定法评价SBR中污泥的硫化物耐受性。结果表明,污泥的半最大抑制浓度(IC 50)为0.73 mg-S L-1,这是一个典型值。因此,预先存在的硫化物耐受性的污泥是不是主要因素,使稳定的硝化在硫化物供应期间。在整个实验期间,使用139天的长污泥停留时间操作反应器。SBR中有效的污泥滞留和较长的填充时间可能促进了微生物对硫化物的驯化,从而使硝化性能即使在硫化物供应下也保持稳定。
Ammonia-containing wastewater often also contains sulfide, which severely inhibits biological nitrification. In this study, the applicability of a sequencing batch reactor (SBR) with a long fill period to achieve stable nitrification of sulfide-containing anaerobic digestion effluent was evaluated. During the start-up period, in which no sulfide was supplied to the reactor (Phase I, experimental days 0–18), ammonium was oxidized to nitrate stably after day 6. During the period in which sulfide was supplied at 32 mg-S L−1d−1(Phase II, experimental days 18–30), the nitrification efficiency temporarily decreased to 79%, but recovered rapidly to 100% within two days. The sulfide tolerance of the sludge in the SBR was evaluated by batch bioassays at the end of the start-up period. The results showed that the half-maximum inhibitory concentration (IC50) for the sludge was 0.73 mg-S L−1, which was a typical value. Therefore, pre-existing sulfide tolerance of the sludge was not the main factor enabling stable nitrification during the sulfide supply period. Throughout the experimental period, the reactor was operated using a long sludge retention time of 139 days. The effective sludge retention in the SBR with a long fill period probably promoted the acclimatization of the microbes to sulfide, allowing the nitrification performance to remain stable even under sulfide supply.
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