引用本文:王尉,常雅军,崔键,等.改性丝瓜络填料对富营养化水体的高效脱氮特性[J].环境科学研究,2020,(1):130-137.
WANG Wei,CHANG Yajun,CUI Jian,et al.High-Efficiency Nitrogen Removal of Eutrophic Water by Modified Loofah Fillers[J].Research of Environmental Sciences,2020,(1):130-137.]
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改性丝瓜络填料对富营养化水体的高效脱氮特性
王尉, 常雅军, 崔键, 刘晓静, 杜凤凤, 姚东瑞
江苏省中国科学院植物研究所, 江苏 南京 210014
摘要:
生物膜技术是污水处理的研究热点之一,但存在挂膜时间长、反硝化碳源供给不足等问题.为解决这一问题,以不同浓度NaOH溶液(对照组、2%、5%和10%)对丝瓜络进行改性处理,再将其作为挂膜填料构建BDBR(biofilm denitrification batch reactor,生物膜原位脱氮系统),研究BDBR的脱氮效能.结果表明:①当系统运行至第4天时,对照组、2%组、5%组和10%组反应器的CODCr去除率趋于稳定,分别为78.9%、76.8%、80.8%和73.9%;当系统运行14 d时,对照组、2%组、5%组和10%组反应器的TN去除率趋于稳定,分别为67.2%、90.8%、91.9%和83.2%;而当系统运行至第10天时,2%组、5%组和10%组反应器对NH3-N的去除率趋于稳定,依次为82.8%、88.4%和78.8%,显著高于对照组(68.1%).②改性丝瓜络反应器的膜生物量(2%组、5%组和10%组)均显著高于未进行改性处理的对照组,且随NaOH溶液浓度从2%增至10%,对应反应器膜生物量从12.12×106 nmol(以每g干质量磷脂计)增至24.02×106 nmol.③改性丝瓜络填料上的生物膜的硝化、反硝化菌数量均显著高于未改性处理的丝瓜络填料的硝化、反硝化菌数量.研究显示,丝瓜络填料所构建的BDBR对富营养化河道水中的CODCr均有较高的去除能力,这与丝瓜络是否进行改性无关.但用浓度为2% NaOH溶液对丝瓜络进行改性处理后构建的BDBR体现出了最高的生物膜硝化、反硝化菌数量和最好的脱氮效果,可应用于富营养化水体的BDBR中,以实现生物膜的快速构建和系统的稳定运行.
关键词:  改性丝瓜络  生物膜原位脱氮系统(BDBR)  富营养化  脱氮效应
DOI:10.13198/j.issn.1001-6929.2019.06.12
分类号:
基金项目:江苏省环保科研课题(No.2016044);江苏省渔业科技类项目(No.Y2017-27)
High-Efficiency Nitrogen Removal of Eutrophic Water by Modified Loofah Fillers
WANG Wei, CHANG Yajun, CUI Jian, LIU Xiaojing, DU Fengfeng, YAO Dongrui
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
Abstract:
Biofilm technology is one of the research hotspots in wastewater purification at present, but it has the problem of long filming time and inadequate supply of denitrifying carbon source. To solve this problem, nitrogen removal efficiency of Biofilm Denitrification Batch Reactor (BDBR) constructed with different fillers of modified loofah fibers, which were pretreated by soaking in different concentrations of NaOH solutions (2%, 5% and 10%) with no NaOH treatment (dH2O) as control (CK), was investigated in the present study. The results indicated that:(1) The removal rates of CODCr from four BDBR systems, constructed correspondingly with 0 (CK), 2%, 5% and 10% NaOH soaked loofah fillers, tended to be stable on the fourth day treated with the BDBR systems and reached to 78.9%, 76.8%, 80.8% and 73.9%, respectively; the removal rates of total nitrogen (TN) in the four systems containing 0 (CK), 2%, 5% and 10% NaOH modified loofah fillers, respectively, reached to a stable status when the system was running for 14 days, with the value of 67.2%, 90.8%, 91.9% and 83.2%, respectively; while on the 10th day of the treatments, the removal rates of NH3-N in the BDBR systems constructed with 2%, 5% and 10% NaOH modified loofah fillers achieved stability and reached 82.8%, 88.4% and 78.8%, which were significantly higher than that in CK with removal rate of 68.1%. (2) The biomass (expressed as phospholipid content per gram of dry mass) of modified loofah fillers (modified by 2%, 5% and 10% NaOH) derived BDBR systems was significantly higher than that of the control (CK), and the biomass of the corresponding treatments increased from 12.12×106 nmol to 24.02×106 nmol with NaOH concentration increasing from 2% to 10%. (3) The number of nitrifying and denitrifying bacteria on modified loofah filler biofilm was markedly higher than that of the loofah filler biofilm with no modification. These results showed that the BDBR constructed by modified loofah filler had high CODCr removal capacity in eutrophic river water, but it had no relation with whether loofah is modified or not. However, the BDBR system constructed by 2% NaOH modified loofah fillers exhibited the highest number of nitrifying and denitrifying bacteria on the biofilm, and also displayed the highest removal efficiencies of TN and NH3-N. Hence, the NaOH modified loofah fillers can be applied to the BDBR system for the treatment of eutrophic water, and can contribute to the rapid construction of biofilm and the stable operation of the system.
Key words:  modified loofah fiber  BDBR  eutrophication  nitrogen removal efficiency