Applications of municipal wastewater treatment in lives 给水排水工程专业英语论文.doc
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1、 1 Water and Wastewater Engineering Final Class Project Title:Applications of municipal wastewater treatment in lives 2 Applications of municipal wastewater treatment in lives Abstract:This article describes the following sections:sequential combination of photocatalytic oxidation with constructed w
2、etlands is the study and the experimental evaluation of an alternative and innovative wastewater treatment system, which combines the action of photocatalytic oxidation with the surface flow constructed wetlands.A new contact oxidation filtration separation integrated bioreactor was used to treat mu
3、nicipal wastewater.the synthetic polymers normally used in the coagulation-flocculation treatment of waste water requires sustainable alternatives. Keywords:bioreactor;coagulation;flocculation;photocatalytic oxidation; Combination of photocatalytic oxidation with constructed wetlands Wastewater trea
4、tment systems have been designed to minimize the environmental impacts of discharging untreated wastewater.Different options for wastewater treatment have different performance characteristics and also different direct impacts on the environment. During the last decades centralized conventional wast
5、ewater treatment systems were typically provided to large cities and secondary towns. They involve large capital investments and operating costs, resulting in systems which are considered as not proper solutions for small villages that cannot afford such expensive treatment facilities.In addition, l
6、ow water use rates and several operational problems have been encountered with such systems in rural and especially in touristic areas where the population size varies seasonally. The need for alternative methods of wastewater treatment is of interest to regulating authorities everywhere. The so-cal
7、led advanced oxidation technologies (AOTs) are among the most effective chemical oxidation processes, and are currently gaining significant importance in water treatment applications. Under this term the scientific community refers to the technologies whose effectiveness is based on the production o
8、f the OH radicals, one of the most powerful oxidant reagents.They can easily attack the organic molecules leading to the production of organic peroxide radicals and their final conversion to CO2,H2O and inorganic salts. The increased concern for the use of the AOTs may be explained by the need for s
9、eeking of new,alternative to the conventional ones and environmentally friendly technologies. 3 Among these, heterogeneous and homogeneous solar photocatalytic detoxification methods (TiO2/H2O2,Fe3+/H2O2) have shown recently great promise for the treatment of industrial wastewater,groundwater and co
10、ntaminated air, allowing the contribution of the renewable sources of energy (solar energy) to the process of cleaning and restoring the environment. The system combines the action of photocatalytic oxidation with the surface flow constructed wetlands in order to utilize the high solar irradiation i
11、n the Mediterranean region and the ability of the constructed wetlands to improve water quality through natural processes, providing treated wastewater capable of being reused, e.g. for irrigation. More specifically,the method consists of the combination of a common physicochemical precipitation, a
12、solar photocatalytic reduction of the organic content of wastewater by the use of a heterogeneous or homogeneous solar photocatalytic method, and finally passage of the wastewater through a constructed wetland, for the final purification of the wastewater to make its reuse possible. A contact oxidat
13、ion filtration separation integrated bioreactor Traditional wastewater treatment processes are usually equipped with different treatment units that have a variety of functions to achieve acceptable treatment performance. Conventional processes for municipal wastewater treatment have disadvantages su
14、ch as complicated operation, high running cost, excessive installation and large land requirement. As a result, wastewater treatment plants normal operation face a number of key challenges in developing countries such as China. In comparison with those traditional wastewater treatment processes, bio
15、-film systems have low land requirement and flexible operation. Bio-film technology systems include trickling filters, biological aerated filter (BAF), rotating biological contactor (RBC), fluidized bed reactor (FBR) and moving-bed reactor (MBR). To help overcome these issues, a new contact oxidatio
16、n filtration separation integrated bioreactor (CFBR) was developed, which was composed of a Bio-film reactor (the upper part of CFBR) and a gravitational filtration bed prototype and principles of slow and cake filtration .Bio-film configuration coupled with gravitational filtration bed combines the
17、 advantages of the Bio-film reactor and the filtration bed in one system. As the use of filtration process, the CFBR can keep its effluent SS at a lower level. Moreover, the low investment cost of CFBR allows a cost-saving advanced 4 treatment for pollutants from small and medium sized factories as
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