Abstract: At present, China's sewage treatment industry is still in its infancy. The sewage treatment capacity still can not keep up with the rapid expansion of the scale of water use. However, the sewage treatment rate in urban areas is not high, and there is no specific sewage treatment plant in rural areas. According to the actuality of rural areas in China, It is impossible to deal with domestic sewage in villages according to a unified and fixed pattern and should adopt suitable methods of sewage treatment according to local conditions.

introduction

With the accelerating pace of building a new socialist countryside in our country, the rural economy has made great strides in development. Various factories have successively been put into construction and production, and all kinds of breeding projects have also achieved industrialization. However, the ecological environment in rural areas has been destroyed. Especially, the unorganized discharge of rural domestic sewage has brought pollution to local water resources and land resources, bringing hidden dangers to the production and living of rural residents. Resulting in the masses of the continuous treatment of rural sewage calls.

First, China's rural sewage treatment characteristics

China's rural domestic sewage mainly comes from gray water and black water produced in the process of family life, in which gray water is composed of kitchen drainage, sanitary shower water and washing water; black water is composed of excrement, urine and washing water. At present, domestic sewage treatment in rural areas in China has four characteristics: First, the coverage of domestic sewage is broad, relatively scattered; second, there are many ways to produce domestic sewage; third is in the gradual growth; Fourth, the treatment rate is low.

Second, rural life sewage treatment technology

In view of the current status of rural sewage in our country, the author proposes the following three technical measures for your reference:

1, domestic sewage purification biogas technology

The technology uses multi-stage gravity technology, suitable for decentralized treatment of domestic sewage, with investment in the province, no operating costs, easy management and so on. The technology is different from the traditional biogas technology, wastewater can be discharged after compliance.

â‘ , use and function

Domestic sewage, including kitchen cooking water, bathing, washing water and flushing toilet water, which has three characteristics: First, the toilet flushing water contains manure, is a source of infection of many diseases; Second, domestic sewage concentration is low; Third, domestic sewage can be degraded Good sex, suitable for anaerobic nitrification system. Domestic sewage purification Digester is based on the above characteristics of domestic sewage, sewage anaerobic nitrification, sedimentation filtration and other processing technologies into one and designed treatment device. Domestic sewage purification Biogas digesters are new structures that disperse and treat domestic sewage and are suitable for rural areas that have recently been unable to build sewage treatment plants.

â‘¡, pool structure and working principle

Domestic sewage purification Biogas digester is a multi-polar baffle digestion system integrating water pressure biogas digester, anaerobic filter and facultative anaerobic pond. After excrement has been removed from the coarse solids by the grate, the desalination tank enters the pretreatment zone 1 where the excrement undergoes biogas fermentation and gradually flows backward. The resulting sludge suspended solids settles in the second half of the zone and flows along the inclined The bottom of the pool slips back to the front and is mixed with newly entered excrement for biogas fermentation. The supernatant is overflowed into the pre-treatment zone 2 where it is mixed with other domestic sewage outside the excrement for biogas fermentation and flows backward through the anaerobic filter section to attach to the packing the biofilm-focused bacteria on the packing for further anaerobic nitrification of the effluent , And then overflow into the pool after treatment. The pre-treatment zone 1 and the pre-treatment zone 2 are both improved hydraulically activated biogas digesters. The aftertreatment zone is a three-stage baffled amphibious pool that communicates with the atmosphere and has a foam filter plate on top to intercept suspended solids to increase effluent Water quality.

2, no power multi-level anaerobic complex ecological processing system

The technology is suitable for decentralized household kitchen, laundry, bathing and other low concentrations of rural domestic sewage treatment, especially for topographical differences in scattered households or 2 to 5 households in rural life sewage treatment.

â‘ , the basic principle

In response to the current shortage of funds in our country, the current situation of energy shortage and pollution is increasingly serious, anaerobic treatment technology is a technology that is particularly suitable for China's national conditions. However, because of the separate anaerobic nitrogen, phosphorus and other nutrients basically no removal capacity, sewage nitrogen, phosphorus will make water eutrophication. At the same time, anaerobic treatment alone can not remove germs very well. Anaerobic effluent can not meet the national discharge standards under normal circumstances. Based on the above background, for the treatment of single-family or joint household sewage, a set of mature anaerobic treatment and ecological bed combination of the treatment method, referred to as non-powered multi-stage anaerobic composite ecological treatment system.

Steel Plate

A Carbon Steel Plate has usually been considered as the steel that does not contain much alloy steel elements, also named as mild steel. Generally, elements are C, Mn, P, S, Si, besides these, there are no minimum limits for elements of Al, Cr, Ni, Mo, V, etc.

Carbon steel plates are available in different grades depending on the carbon content and strength.

As the content of Carbon increase, the steel plate hardness increases.

Low carbon steel plate: For carbon content 0.06% to 0.25%, also we call it Mild Steel Plate.

Medium carbon steel plate: C content from 0.25% to 0.55%.

High carbon steel plate: 0.55% to 1.0%, also called hard steel plate.

Low carbon steel is the most common form, and it's very malleable and ductile. Medium carbon steel balances ductility as well as strength for excellent wear resistance. High carbon steel is exceptionally strong, while ultra-high carbon steel can be tempered to even greater hardness but no malleability.

As the percentage of carbon gets larger, steel can become harder and stronger through heat-treating. Carbon steel is usually heated to change the mechanical properties of steel, usually ductility, hardness, strength, and resistance of impact. Increasing the carbon content of carbon steel makes it harder and stronger, but reduces the steel`s ability to be welded, making it more brittle.

Carbon steel plate is most often used for structural purposes such as buildings, yet it has the flexibility to be worked into ornate designs. Low carbon steel sheet (wrought iron) is typically used for fences, chain links, gates, and railings. Structural steel (medium carbon steel) is used in cars, refrigerators, washing machines, buildings, and bridges. The steel sheets are normally made up of medium carbon steel.

Hot Rolled Steel Plate,Pressure Vessle Steel Plate,4130 Alloy Steel Plate,Abrasion Resistant Steel Plate

Shandong Guanzhou Iron and Steel Group Co., Ltd , https://www.shansteelsupply.com