给水排水工程专业英语论文.doc
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1、Water and Wastewater Engineering Final Class ProjectTitle:Applications of municipal wastewater treatment in livesCollege _C。E_ Major _ _WWE_ Class _ _ Number_ _ Name_ _ Data_4WWE Final Class Project Student Name:Applications of municipal wastewater treatment in livesAbstract:This article describes t
2、he following sections:sequential combination of photocatalytic oxidation with constructed wetlands 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 wetlan
3、ds.A new contact oxidation filtration separation integrated bioreactor was used to treat municipal wastewater。the synthetic polymers normally used in the coagulationflocculation treatment of waste water requires sustainable alternatives。Keywords:bioreactor;coagulation;flocculation;photocatalytic oxi
4、dation;Combination of photocatalytic oxidation with constructed wetlands Wastewater treatment 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
5、direct impacts on the environment. During the last decades centralized conventional wastewater 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
6、for small villages that cannot afford such expensive treatment facilities.In addition, low 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
7、 of wastewater treatment is of interest to regulating authorities everywhere. The so-called 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 scientif
8、ic community refers to the technologies whose effectiveness is based on the production of 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
9、 salts. The increased concern for the use of the AOTs may be explained by the need for seeking of new,alternative to the conventional ones and environmentally friendly technologies。 Among these, heterogeneous and homogeneous solar photocatalytic detoxification methods (TiO2/H2O2,Fe3+/H2O2) have show
10、n recently great promise for the treatment of industrial wastewater,groundwater and contaminated 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
11、the surface flow constructed wetlands in order to utilize the high solar irradiation in 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 specificall
12、y,the method consists of the combination of a common physicochemical precipitation, a 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
13、 the final purification of the wastewater to make its reuse possible.A contact oxidation filtration separation integrated bioreactorTraditional wastewater treatment processes are usually equipped with different treatment units that have a variety of functions to achieve acceptable treatment performa
14、nce. Conventional processes for municipal wastewater treatment have disadvantages such 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 suc
15、h as China。In comparison with those traditional wastewater treatment processes, biofilm systems have low land requirement and flexible operation。 Biofilm technology systems include trickling filters, biological aerated filter (BAF), rotating biological contactor (RBC), fluidized bed reactor (FBR) an
16、d moving-bed reactor (MBR). To help overcome these issues, a new contact oxidation filtration separation integrated bioreactor (CFBR) was developed, which was composed of a Biofilm reactor (the upper part of CFBR) and a gravitational filtration bed prototype and principles of slow and cake filtratio
17、n .Biofilm configuration coupled with gravitational filtration bed combines the advantages of the Biofilm 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 costsaving
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