利用亚硝酸盐微生物同时去除下水道中的硫化物和甲烷

IF 7.2 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Zhiqiang Zuo , Yaxin Xing , Xi Lu , Tao Liu , Min Zheng , Miao Guo , Yanchen Liu , Xia Huang
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引用次数: 0

摘要

为了减少硫化氢(H2S)和甲烷(CH4)的排放,通常会在下水道系统中投加化学品,这不仅成本高昂,而且会引起环境问题。投加亚硝酸盐是一种很有前景的方法,因为可以从尿液废水中产生亚硝酸盐,这是一种可行的综合水管理策略。然而,亚硝酸盐投加通常需要严格的条件,如相对较高的亚硝酸盐浓度(如 200 mg N/L)和酸性环境,以抑制微生物。与 "微生物抑制 "不同,本研究提出了 "微生物利用 "的概念,即利用亚硝酸盐作为底物,在下水道中消耗 H2S 和 CH4。在实验室规模的下水道反应器中,持续投放浓度相对较低的亚硝酸盐(25-48 毫克/升)。在亚硝酸盐还原的同时,成功地发生了两个依赖亚硝酸盐的微生物利用过程,即依赖亚硝酸盐的厌氧甲烷氧化(n-DAMO)和微生物硫化物氧化。这两个过程的发生使污水反应器中的溶解甲烷减少了 58%,硫化物去除率超过 90%,测得的微生物活性分别为 15.6 mg CH4/(L-h)和 29.4 mg S/(L-h)。在下水道生物膜和沉积物中都检测到了高拷贝数的 n-DAMO 细菌和硫化物氧化细菌 (SOB)。机理分析证实,由于下水道沉积物中的活性区向下迁移,相对低浓度的亚硝酸盐不会导致硫化物生成过程受到抑制。因此,拟议的 "微生物利用 "概念为同时去除下水道中的硫化物和甲烷提供了一种新的选择。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nitrite-dependent microbial utilization for simultaneous removal of sulfide and methane in sewers

Nitrite-dependent microbial utilization for simultaneous removal of sulfide and methane in sewers

Chemicals are commonly dosed in sewer systems to reduce the emission of hydrogen sulfide (H2S) and methane (CH4), incurring high costs and environmental concerns. Nitrite dosing is a promising approach as nitrite can be produced from urine wastewater, which is a feasible integrated water management strategy. However, nitrite dosing usually requires strict conditions, e.g., relatively high nitrite concentration (e.g., ∼200 mg N/L) and acidic environment, to inhibit microorganisms. In contrast to “microbial inhibition”, this study proposes “microbial utilization” concept, i.e., utilizing nitrite as a substrate for H2S and CH4 consumption in sewer. In a laboratory-scale sewer reactor, nitrite at a relatively low concentrations of 25–48 mg N/L was continuously dosed. Two nitrite-dependent microbial utilization processes, i.e., nitrite-dependent anaerobic methane oxidation (n-DAMO) and microbial sulfide oxidation, successfully occurred in conjunction with nitrite reduction. The occurrence of both processes achieved a 58 % reduction in dissolved methane and over 90 % sulfide removal in the sewer reactor, with microbial activities measured as 15.6 mg CH4/(L·h) and 29.4 mg S/(L·h), respectively. High copy numbers of n-DAMO bacteria and sulfide-oxidizing bacteria (SOB) were detected in both sewer biofilms and sediments. Mechanism analysis confirmed that the dosed nitrite at a relatively low level did not cause the inhibition of sulfidogenic process due to the downward migration of activity zones in sewer sediments. Therefore, the proposed “microbial utilization” concept offers a new alternative for simultaneous removal of sulfide and methane in sewers.

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来源期刊
Water Research X
Water Research X Environmental Science-Water Science and Technology
CiteScore
12.30
自引率
1.30%
发文量
19
期刊介绍: Water Research X is a sister journal of Water Research, which follows a Gold Open Access model. It focuses on publishing concise, letter-style research papers, visionary perspectives and editorials, as well as mini-reviews on emerging topics. The Journal invites contributions from researchers worldwide on various aspects of the science and technology related to the human impact on the water cycle, water quality, and its global management.
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