外文翻译-畜牧场废水的处理方法.doc

1、Livestock sewage treatment1.Solid-liquid separation and physical-chemical treatment systems202. Land Treatment System202.1 Slow percolation system202.2 Rapid percolation system212.3 Slow surface flow system212.4 Wetland System213. Artificial wetland treatment system214. Anaerobic - aerobic treatment

2、225. Aeration treatment226. Anaerobic fermentation tank system22畜牧场废水的处理方法1.固液分离和理化处理系统232.土地处理系统232.1慢速渗虑系统232.2快速渗虑系统242.3地表慢流系统242.4湿地系统243. 人工湿地处理系统244. 厌氧好氧联合处理255. 曝气处理法256. 厌氧池发酵处理系统2526Livestock sewage treatmentAbstractLivestock sewage treatment methods, according to the basic principles of

3、physics can be divided into processing, chemical processing, physico-chemical treatment and biological treatment, and other four groups. A separate use of any method can make livestock high concentration of the sewage is an effective treatment (meet emission standards) Therefore, the need for the sy

4、stems. Keywords：Livestock sewage & treatment methodsAt present, large-scale aquaculture sewage treatment systems are in the following categories : 1.Solid-liquid separation and physical-chemical treatment systems Processing flow : solid-liquid separation - precipitation - gasification - acidificatio

5、n - decontamination - ponds - emissions. Solid-liquid separation, the separation of solids for organic fertilizer, and the separation of sewage into the sedimentation tanks, Precipitation after the gasification of sewage discharged into the pool again or coagulant treatment pond. Alum generally can

6、be used to make the sewage from 15000mg COD / L reduced 2700mg / l; acidification by the pool, the sewage COD dropped 1,800 mg / L, then three pool purification, COD to 560 mg / L, after three ponds of fish food digestion and purification, effluent COD can reach 160-200 mg / L. Such systems can be b

7、asically sewage purification to meet emissions standards to be comprehensive utilization. Make its shortcomings : a longer process flow, size, the high cost of investment projects2. Land Treatment System Land Treatment System is the sewage drying cloth on the land, using the soil crops occurred puri

8、fication of sewage treatment system, includes physical filtration, adsorption, chemical reactions and chemical precipitation, and microbial metabolism of the decomposition of organic materials such as. 2.1 Slow percolation system Equivalent to the sewage irrigation, water seepage in the soil for goo

9、d performance (such as sandy clay) and the small amount of evaporation, Crops planted on the land. This system can achieve sewage treatment and utilization. Sewage from the soil slow to filter down to consider the process, through the soil microorganisms and crops to sewage purification, Crops can t

10、ake full advantage of sewage water and fertilizer nutrients. However, the sewage system must pay attention to the layout of crops and the amount of spending needs. 2.2 Rapid percolation system Groundwater recharge is so that the sewage water reuse for the purpose of the system, apply to the permeabi

11、lity of the soil is very good (such as sand). Generally not their crops, sewage on the surface evenly spread quickly seep into the ground. Irrigation intermittent, and can effectively remove suspended solids, organic matter, phosphorus and heavy metals material. The system requires a higher level of

12、 treatment.2.3 Slow surface flow systemApplied on the ground with 2 -8% gradient of less permeable clay and heavy clay plots planted on the ground or other forage crops. Sewage block in the resumption of high-end spread along the ground uniformly slow flow, the next set of drains located. The sewage

13、 purification system less effective, but the pollution of groundwater smaller. 2.4 Wetland System Is the use of low-lying wetlands or swamps to sewage treatment systems. Except for the above land treatment system to its role in the water can grow algae and aquatic plants, oxygen through photosynthes

14、is, absorbing carbon dioxide, similar to the formation of a stabilization pond aquatic ecosystems. Land use system can take full advantage of the sewage and nutritional ingredients, the required infrastructure costs and operating costs very little, But to be certain conditions. Land Treatment System

15、 and the wider application, there are many difficulties. Artificial wetland system study is a general direction. 3. Artificial wetland treatment system Artificial wetland treatment system is a manual carefully design and construction works of the relative independence of the wetland system, is the i

16、ntegrity of a man-made wetland ecosystems, plants, gravel bed, microorganisms and other subsystems. On the entire wetland system to the physical, chemical and biological role of the sewage purification. Farms in the United States of sewage treatment technology, there are many oxidation pond and artificial wetland model. Dogwoodride farms artificial wetlands nine years runn