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Design and Feasibility Analysis of a Self-Sustaining Biofiltration System for Removal of Low Concentration N2O Emitted from Wastewater Treatment Plants
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1021/acs.est.7b02750 Hyun Yoon 1 , Min Joon Song 1 , Sukhwan Yoon 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1021/acs.est.7b02750 Hyun Yoon 1 , Min Joon Song 1 , Sukhwan Yoon 1
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N2O is a potent greenhouse gas and ozone-depletion agent. In this study, a biofiltration system was designed for removal of N2O emitted at low concentrations (<200 ppmv) from wastewater treatment plants. The proposed biofiltration system utilizes untreated wastewater from the primary sedimentation basin as the source of electron donor and nutrients and energy requirement is minimized by utilizing gravitational force and pressure differential to direct liquid medium and gas through the biofilter. The experiments performed with laboratory-scale biofilter in two different configurations confirmed the feasibility of the biofiltration system. The biofilter operated with cycling of raw wastewater exhibited up to 94% and 53% removal efficiency with 100 ppmv N2O in N2 and air, respectively, as the feed gas, corroborating that untreated wastewater can serve as a robust source of electron donor and nutrients. The laboratory-scale biofilter operated with a continuous flow-through of synthetic wastewater attained >99.9% removal of N2O from N2 background at the gas flow rate up to 2,000 mL·min–1 and >50% N2O removal from air background at the gas flow rate of 200 mL·min–1. nosZ-containing bacterial genera including Flavobacterium (5.92%), Pseudomonas (4.26%) and Bosea (2.39%) were identified in the biofilm samples collected from the oxic biofilter, indicating these organisms were responsible for N2O removal.
中文翻译：
一种自持式生物滤池系统去除废水处理厂低浓度N 2 O的设计及可行性分析
N 2 O是有效的温室气体和臭氧消耗剂。在这项研究中，生物过滤一系统被设计用于去除N个2从污水处理厂在低浓度发射O（<200 ppmv的）。拟议的生物过滤系统利用一级沉淀池中未经处理的废水作为电子给体的来源，通过利用重力和压差将液体介质和气体引导通过生物过滤器，使营养和能量需求降至最低。用实验室规模的生物滤池以两种不同的配置进行的实验证实了该生物滤池系统的可行性。在原始废水循环下运行的生物滤池的脱氮效率高达94％和53％，其中N 2 O为100 ppmv2和空气分别作为原料气，证实了未经处理的废水可以作为电子供体和营养物质的强大来源。该实验室规模的生物过滤用连续流通式合成废水的达到>去除N中的99.9％的运转2 ö选自N 2背景在气体流率高达2000毫升·分钟-1和> 50％的N 2选自O去除气体流速为200 mL·min –1时的空气背景。含nosZ的细菌属包括黄杆菌（5.92％），假单胞菌（4.26％）和波西（Bosea）（2.39％）从好氧滤池中收集的生物膜样品中被鉴定，表明这些生物体是负责Ñ 2 ö去除。
更新日期：2017-09-08
中文翻译：
一种自持式生物滤池系统去除废水处理厂低浓度N 2 O的设计及可行性分析
N 2 O是有效的温室气体和臭氧消耗剂。在这项研究中，生物过滤一系统被设计用于去除N个2从污水处理厂在低浓度发射O（<200 ppmv的）。拟议的生物过滤系统利用一级沉淀池中未经处理的废水作为电子给体的来源，通过利用重力和压差将液体介质和气体引导通过生物过滤器，使营养和能量需求降至最低。用实验室规模的生物滤池以两种不同的配置进行的实验证实了该生物滤池系统的可行性。在原始废水循环下运行的生物滤池的脱氮效率高达94％和53％，其中N 2 O为100 ppmv2和空气分别作为原料气，证实了未经处理的废水可以作为电子供体和营养物质的强大来源。该实验室规模的生物过滤用连续流通式合成废水的达到>去除N中的99.9％的运转2 ö选自N 2背景在气体流率高达2000毫升·分钟-1和> 50％的N 2选自O去除气体流速为200 mL·min –1时的空气背景。含nosZ的细菌属包括黄杆菌（5.92％），假单胞菌（4.26％）和波西（Bosea）（2.39％）从好氧滤池中收集的生物膜样品中被鉴定，表明这些生物体是负责Ñ 2 ö去除。
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