環(huán)境工程外文翻譯－uasb厭氧處理工藝的現(xiàn)狀與發(fā)展

1、1The status quo and development of UASB anaerobic process Abstract: This paper introduces the origin of UASB reactor, the workingprinciples, characteristics, the development and application of thelatest research progres

2、s, pointing out that the recent UASB reactorresearch focus. Key words: UASB; anaerobic treatment process; 1. Introduction :Anaerobic biological treatment as the use of anaerobic metabolism of microorganisms, without the

3、provision of energy sources under the conditions of organic matter as to be restored by hydrogen donor, while generating energy value of the methane gas. Anaerobic biological treatment applies not only to high concentrat

4、ions of organic wastewater, influent BOD up to the highest concentration of tens of thousands of mg / l, can also be applied in low concentrations of organic wastewater, such as sewage, and other cities. Anaerobic biolog

5、ical treatment process and low consumption, organic volume load, generally 5-10 kgCOD/m3.d, up to a maximum of 30-50 kgCOD/m3.d; less residual sludge; on the nutritional needs of low anaerobes, MDR-toxic, biodegradable o

6、rganic molecular weight high impact resistant capacity of strong output of methane is a kind of clean energy. In the whole of society to promote a recycling economy and the implementation of the concerns of the industria

7、l waste recycling today, anaerobic biological treatment of sewage is clearly enables the optimization of resources. In recent years, the anaerobic wastewater treatment process developed very rapidly, with new technology,

8、 new methods emerging, including anaerobic contact method, the up-flow anaerobic sludge bed anaerobic stall plate, anaerobic biological filter , anaerobic expanded bed and fluidized bed, and the third generation of anaer

9、obic process EGSB and IC anaerobic reactor, developed very rapidly. And the up-flow anaerobic sludge blanket UASB (Up-flow Anaerobic Sludge Bed, Note: hereinafter referred to UASB) owing to the anaerobic process of anaer

10、obic filters and activated sludge characteristics of the dual, as can be transformed into the pollutants in the sewage 10% of renewable clean energy - a biogas technology. The different solid content of the sewage adapta

11、bility also strong, and its structure, operation and maintenance management operation is relatively simple and relatively low cost, technology is now mature, and increasingly sewage treatment industry attention, was wide

12、ly welcomed and Application . This paper attempts to UASB technology and the operation of the UASB design features, as well as areas for a start briefly described. 2. The origin of UASB In 1971 Holland (Wageningen) Agric

13、ultural University Ladingge (Lettinga) Professor physical structural design, the use of the gravitational field of the role of different density material difference, invented the three-phase separator. The activated slud

14、ge wastewater retention time and stay separated, and formed a upflow anaerobic sludge blanket (UASB) reactor on the prototype. Netherlands CSM 1974 in its 6 m3 reactor sugar beet processing wastewater, it was found that

15、the activated sludge formation mechanism of its own fixed biological polymer structure, granular sludge (granular sludge). 3entering the settlement room, the sludge in the settlement, returned to the reaction zone by the

16、 slant to clarify the water from the overflow. Sludge in the microbial decomposition of organic matter in sewage, it turned into gas. Tiny gas bubbles to form the release, tiny bubbles rising in the course of the merger,

17、 and gradually form larger bubbles in the sludge bed methane because of the disturbance to form a sludge concentration in the sludge and thin together with increased access to three water phase separator, encountered gas

18、 separator plate at the bottom of reflection, the reflection plate% for the four weeks, and then enter the water through the chamber, concentrated in the gas chamber with catheter export, the solid-liquid mixture into th

19、e three-phase reflection Separator sedimentation, sewage sludge in the flocculation, particle gradually increasing, and the role of gravity in the settlement. Precipitation ramps to the wall of sewage quagmire oblique wa

20、ll slip back anaerobic reactor area, the reaction region accumulated a large number of sludge, and sludge from the treated effluent from the upper sediment overflow weir area, and then discharged sludge bed. The basic re

21、quirements are: (1) To provide a conducive sludge flocculation of the physical, chemical and mechanical conditions, access to anaerobic sludge sedimentation and maintain a good performance; (2) Good sludge bed often form

22、 a fairly stable biological phase, and maintain specific probiotics environment, the strong resistance to disturbance force, the larger floc precipitation has good properties, thereby enhancing the equipment sludge conce

23、ntration; (3) in the sludge bed equipment through the establishment of a precipitation area, the fine particles of sludge sedimentation in the sludge layer further flocculation and sedimentation, and then back into the s

24、ludge bed. 4. UASB reactor, the process features UASB reactor operation of three important premise: ① reactor in the form of a good settlement or granular sludge floc sludge; ② produced gas and uniform distribution of wa

25、ter formed by mixing a good role ③ rational design The three-phase separator, the good performance of precipitation can remain in the sludge in the reactor. (1) the use of microorganisms immobilized cell technology - slu