优质期刊论文发表网提供专业的论文发表、论文写作以及期刊推广服务!QQ:820771224

电话:18796337551
当前位置:优质期刊论文发表网环境论文 → 文章正文

生物膜-水生植物生态系统协同净化乡村黑臭河水特性与效能研究

作者:优质期刊论文发表网  来源:www.yzqkw.com  发布时间:2019/10/26 14:11:28  

摘要:我国南方地区乡镇分布着大量的河道、支浜等小型水体,随着乡镇工业的发展和人们生活水平的提高,大量污染物被转移到这些较为封闭、消纳污染物能力较弱的水体中,造成这些水体普遍存在的黑臭问题。水体黑臭问题不仅感官上影响人们对该地区环境污染的印象,同时黑臭水体其本身含有高浓度的污染物,这些污染物随水体下渗也严重威胁了地下水等饮用水的安全。因此,黑臭水体治理是我国在水体污染控制方面的一个重要内容,也是实现生态文明建设的重要组成部分。

本文采用生物膜-水生植物生态系统净化乡村黑臭河水,涉及的研究内容包括:①通过比较多种水生植物净化效果,筛选出净水综合能力较强的用于黑臭河水的治理;②构建生物膜-水生植物生态系统,探究其在不同曝气方式下净化黑臭水体的效能,同时探究其对河水中内分泌干扰物的净化能力,并分析其出水急性毒性;③揭示该系统中生物膜的形成,浮游生物丰富度,底泥中细菌等微生物的变化规律,分析种群等变化情况与水质变化情况之间的规律;④探求不同污染程度河道整治后的净化效果及黑臭情况。本文的主要研究结果如下:

(1)采用一种用于评价植物综合净水能力的方法,该方法以不同植物的净化速度和水质稳定后的浓度为评价指标,评估了6中常见挺水植物的净水能力。这6种植物综合净水能力从强到弱依次为:水芹>香蒲>花叶芦苇>再力花>水菖蒲>梭鱼草;净化后的水体水质基本达到Ⅲ~Ⅳ类水标准,水质远好于黑臭河道水质,选取的植物可用于黑臭河道的整治。

(2)采用香蒲等挺水植物构建的生物膜-水生植物生态系统净化黑臭水体,考察了装置在无曝气、曝气和间断曝气情形下对不同水力停留时间(HRT)水体的净化能力。该装置在不同曝气状态下的自净能力为:间断曝气(去除率为:COD44.22%、TP 70.23%、TN 59.46%、NH3-N 56.97%)>持续曝气(去除率为:COD 45.49%、TP 72.36%、TN 37.47%、NH3-N 57.34%)>无曝气(去除率为:COD 38.39%、TP 57.68%、TN 28.22%、NH3-N41.62%);持续曝气对内分泌干扰物的去除效果最好,采用发光细菌急性毒性检测进、出水毒性,进水的相对发光率为78.5%~ 81.2%,为中低毒,持续曝气的生态河道装置出水平均相对发光率为95.2%,EDCs的净化效果较好、出水急性毒性为无毒,持续曝气的生物膜-水生植物生态系统对中低毒性废水的抗冲击能力最强、净化效果较好。

(3)水生植物表面附着一层絮状的生物膜,其中的菌胶团有较强的吸附和氧化作用,是净水系统的重要组成部分;出水口以轻耐污种类的绿藻门为主,可知水质较好;间歇曝气生态河道的平均脲酶活性浓度最高,为6.13 mgNH3-N/kg干泥,脲酶可促进含氮有机物降解为水和二氧化碳;通过底泥中PLFA的测定和高通量454测序可知,持续曝气水体的底泥中以好氧微生物为主,进水口底泥中以不动杆菌属(12.98%)为主,其具有的异养硝化和好氧反硝化特性,促成了TN的高去除率;出水口底泥中的优势菌种为假单胞菌,对水体中TP的降解有重要作用;以不动杆菌和假单胞菌形成的复合菌群对E2有较强的降解作用,曝气可有效遏制硫酸盐还原菌的繁殖,从而扼制河水出现黑臭现象。

(4)采用草本植被构建的生态护坡系统拦截、削减入河污染物;采用挺水植物、浮水植物和沉水植物构造出立体式植物生态修复模型,吸收水体中的N、P等污染物。工程运行近1年的监测结果显示,5条河浜基本消除了黑臭现象。

本文通过筛选净水能力较强的水生植物构建生物膜-水生植物生态系统,探究曝气方式影响内分泌干扰物的去除效果和水体中微生物的物种净污特征。治理黑臭河道的工程设计、后期综合评估方法对于我国黑臭水体的理论研究和工程治理提供了一定的参考价值。

There are a large number of small waterbodies, such as riverway and small tributaries, all over the towns in southernChina. With the deveolpment of township industry and people`s living standards,a large number of pollutants are transferred to these relatively closed waterbodies. These rivers have a low storage capacity and are unable to purify somany pollutants, leading to a serious black and smelly problem. These black andsmelly water affects the environmental status of the region, and thesepollutants also may seeps into groundwater to seriously threaten the safety ofdrinking water. Black and smelly water treatment is an important part of waterpollution control in China, also an important part of the construction ofecological civilization.

In this paper, the biofilm-aquatic plantecosystem was used to purify the black and smelly river water in rural areas.Specific contents including:①By comparing thepurification effects of various aquatic plants, aquatic plants with strongwater purification capacity were selected for the treatment of black and smellyriver. ②An ecological simulated river course was constructed to explore theeffect of different aeration modes and aeration cycles on the purification ofblack and smelly water in the ecological simulated river course. The removaleffect of Endocrine Disrupting Chemicals by ecological simulation river wereexplored. ③The change rules of plankton content and species in simulated riverchannel and bacteria and other microorganisms in sediment were revealed. Theregularity between the variation of equal richness and the variation of waterquality was analyzed. ④This paper also estimated the purification effect andblack-smelly situation in the course of remediation of different pollutedrivers. The main research results of this paper are as follows:

(1) This article use a method to evaluatethe water purification ability of 6 common water plants, taking thepurification speed of different plants and the concentration of stable waterquality as the evaluation index. Six common emergent plants were evaluated bythis method, and the comprehensive pollution carrying capacity of these sixplants was ordered from strong to weak as followed, Oenanthe javanica >,cattail >, flower-leaf reed >, Thalia dealbata Fraser >, water calamus>, Pontederia cordata.

(2) The purification efficiency of black andsmelly water body in natural state, aeration and intermittent aeration wasinvestigated.The self-purification capacity of the simulated ecological riverunder different aeration states is: Intermittent aeration (The removal rate asshown below: COD 44.22%、TP 70.23%、TN 59.46%、NH3-N 56.97%) > continuousaeration (The removal rate as shown below: COD 45.49%、TP72.36%、TN 37.47%、NH3-N 57.34%)> natural state(The removal rate as shown below: COD 38.39%、TP 57.68%、TN 28.22%、NH3-N41.62%). The purification effect of continuous aeration aeration has bestremoval. The effluent toxicity of river was assessed by toxicity test ofluminescent bacteria. The luminescence inhibition rate of water inlet is18.8%~21.5%, which is medium and low toxicity. Ecological river equipment withcontinuous aeration was the lowest toxicity.

(3) The surface of aquatic plants isattached to a layer of flocculate biofilm, accompanied by protozoa such asAmoeba. The main algae at the outlet is diatoms, which belongs to the lightpollution - resistant species, which means better water quality. The averageurease activity concentrations of intermittent aeration ecological riverchannels were 6.13 mgNH3-N/kg dry mud. Urea enzyme can promote the degradationof nitrogen-containing organic matter. Through the detection of PLFA in thesediment and the high throughput 454 sequencing, we know that, aerobicmicroorganisms are the main sediment in the sediment of the continuous aerationwater.

关键词:生物膜-水生植物;环境内分泌干扰物;微生物特性;毒性评价;示范工程

Biofilm-aquatic plants; Endocrinedisrupting chemicals; microbial characteristics; toxicity assessment;demonstration Engineering

  • 上一个文章:硫化镉基复合材料的制备及其光催化性能调控研究
  • 下一个文章:没有资料
  • 联系方式

    客服QQ 820771224
    客服热线18796337551
    网站地址 www.yzqkw.com
    郑重承诺 高效,快速,包发表!
    优质期刊论文发表网真诚欢迎新老客户的光临与惠顾!