共查询到20条相似文献,搜索用时 218 毫秒
1.
2.
将曝气充氧技术、微生物净水技术、植物净化技术及生物促进技术进行组合并用于上海市中心城区黑臭水体污染治理与生态修复。在组合技术应用过程中,各种单项技术在发挥了各自功效的同时获得了协调、共生。曝气充氧可以快速地提高水体的溶解氧,水体中污染物的净化过程由厌氧发酵转化为好氧矿化,导致黑臭的二次污染物浓度随之降低, 相似文献
3.
《化工中间体》2017,(11)
太阳能推流曝气技术是一种专门针对水库湖泊治理的技术,尤其在黑臭湖泊治理中效果最佳,该设备在工程中有投资小,效率高,优势明显。随着经济快速发展,诸多湖泊污染严重,多数湖泊水体缺氧,植物落叶等腐败,水体表现为厌氧状态,水体有异味,不适合水生生物生存,很多水生动植物消失,生态系统结构严重失衡,功能严重退化甚至丧失。在湖泊治理过程中,多数采用截污纳管、湖泊清淤、引水补水、曝气充氧、微生物生态化治理等技术;但是水库湖泊和河道的治理区别比较明显,多数湖泊离人口聚集区较远,治理成本和维护成本都较高,难度也较大。本文介绍一种太阳能推流曝气技术,能有效解决湖泊湾区水动力差,黑臭,缺氧等问题,是一种专门针对黑臭湖泊治理的关键技术。 相似文献
4.
5.
6.
近年来,在人类活动的影响下,河道的生态环境遭受了不同程度的破坏,河道黑臭现象日益严重。针对于黑臭河道的成因,利用曝气技术可向水体中充氧从而达到改善水质的目的。综述了曝气技术的种类及其应用和研究进展。其中利用曝气技术与生态修复技术(生物膜、生物促生剂等)协同作用治理黑臭水体且其作用效果远大于单独使用曝气或生态修复的方法。 相似文献
7.
8.
近年来,黑臭水体已成为水环境的突出问题之一,严重破坏人居环境,影响城市形象.巨野县会盟景观带是中心城区的一条重要的景观河流,然而整治前水体污染较为严重,其溶解氧(DO)浓度较低,氧化还原电位小于-200 mV,氨氮含量大于15 mg/L,属于重度黑臭水体.项目开展了巨野县会盟景观带黑臭水体系统性综合整治工程建设,提出了外源减排及截污、内源清淤及消解底泥、水动力恢复、水质净化和生态修复5个方面系统性治理方案.工程完成后消除了黑臭水体,恢复了河道排水、防涝及景观等功能,河道水质指标优于黑臭水体标准,实现了环境生态综合提升的预期目标,为类似水体治理提供一定的借鉴. 相似文献
9.
10.
11.
为治理某地受TNT红水污染的土壤,采用热分解法处理被污染的土壤,研究了热分解温度、热分解时间、污染土壤样品的质量对处理效果的影响。结果表明,当温度达到300℃以上时,土壤中残余的有机物耗氧量随着热分解温度的增加而降低,且污染土壤样品的洗涤水颜色随着温度的升高越来越浅;土壤中残余有机物的耗氧量随着热分解时间的延长而降低、随土壤质量的增加而升高。确定的最佳工艺条件是:热分解温度为500℃、热分解时间为10min、污染土壤的样品质量为30g,此工艺下土壤中残余的有机物耗氧量从原始污染土壤的15.75mg/g降至0.1642mg/g,去除率为98.96%。GC-MS检测结果表明,热分解法对处理TNT红水污染土壤中的污染物具有明显的去除效果。 相似文献
12.
Niyaz Mohammad Mahmoodi Mokhtar Arami Kamaladin Gharanjig Farahnaz Nourmohammadian Abbas Yousefi Bidokhti 《Desalination》2008,230(1-3):183-192
This paper deals with the degradation of Fenitrothion (an agricultural organophosphorous pollutant) in aqueous solution by titania nanophotocatalysis. The immersion type method was used for the treatment of polluted water. UV-Vis, ion chromatography and chemical oxygen demand analyses were employed to obtain the details of the photocatalytic degradation and mineralization of Fenitrothion. The numerical model was used to solve mathematical equation describing pollutant degradation process. The simulation results were compared to those results obtained from experimental tests and close agreement was achieved. Results show that the immobilized titania nanophotocatalysis is the effective method for removing Fenitrothion from contaminated water. 相似文献
13.
Single processes such as ozonation, ozone/hydrogen peroxide, Fenton and several combined treatment schemes were applied for leachate collected from a waste disposal site. The implementation of combined Fenton and ozonation processes resulted in the highest chemical oxygen demand removal (77% from initial value) among all the treatment methods applied, while biodegradability improvement was observed during the Fenton pre-treatment only. Some decrease of chemical oxygen demand was obtained during the single ozonation or combined schemes including ozone resulting in slight if any biodegradability improvement. The addition of hydrogen peroxide to ozonation did not enhance chemical oxygen demand, dissolved organic carbon or biochemical oxygen demand removal compared to ozone alone. Ferric chloride coagulation used as a pre-treatment stage did not improve subsequent chemical oxygen demand removal by ozonation or the Fenton processes. Taking into account the effective chemical oxygen demand, dissolved organic carbon removal and biodegradability improvement the single Fenton process seems to be a preferable treatment method for the leachate treatment. Some reduction in toxicity to Daphnia magna was observed after the application of the studied treatment methods. 相似文献
14.
以某市受污染城市内河河水为原水,对研发的规模60 m3/d组合式生物膜装置进行了中试研究。组合式生物膜装置由进水过滤单元、生物处理单元、回流单元和出水单元组成,采用势能复氧、通过区域分隔和回流,在减少装置运行能耗的基础上强化污染物净化效果。结果表明在中试的试验进水水质下,当多级好氧池水力停留时间(M-HRT)分别为17.5、26.25和35 min时,随着M-HRT的增加,组合式生物膜装置对COD、NH+4-N的去除率也逐渐增加,对TN的去除率先增大后降低。与M-HRT为17.5 min相比,当M-HRT为26.25 min时其值分别增加了5.3%、9.7%和3.0%,而M-HRT为35 min时分别增加了6.7%、14.3%和1.7%。出现该现象一方面在于M-HRT增加,增大了多级好氧池循环流动的次数,促进了势能跌水复氧的效果,提高了好氧池的DO浓度,另一方面在于M-HRT增加,还增强水流的剪切作用,促进生物膜的生长,增加系统的生物量。 相似文献
15.
16.
17.
Membrane Bioreactor (MBR) technology is widely accepted today for wastewater treatment providing superior effluent quality, opportunities for water reuse, smaller footprint, and better process control. In the following paper, the development and application of hollow fibre submerged membrane modules in Membrane Bioreactors will be discussed. Early MBR systems used tubular cross flow micro-filtration (MF) or ultra-filtration (UF) membrane modules but the huge energy demand for cross flow technology limited it to heavily polluted niche applications. In the late 80’s the development of submerged membrane technology reduced the energy consumption by using aeration to induce a cross flow and withdrawing purified water by slight vacuum allowing the adoption of MBR technology to more conventional applications. Based upon the m2 of membrane area sold/used worldwide, hollow fibre membrane technology is today the most successful submerged MBR technology. 相似文献
18.
19.