Rural sewage treatment technology lecture (6)

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Author: Li Zhaohua

Lecture six: centralized processing process of living sewage in the village

1. Applicable object

2. Pre-processing-artificial wetland

3. Pre-treatment-combined artificial wetland

4. Pre-treatment-soil penetration

5. Pre-treatment-Biological Filter-Artificial Wetland

6. Pre-treatment-oxidation groove

7. Pre-treatment -A/O biological contact oxidation

(1) The centralized processing system is supported by the relatively centralized collection system. Taking the compact single village or multi -village as the processing unit, the general term of the unified processing of the village living sewage treatment facilities or structures is concentrated. Or for usage.

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(2) Applicable to areas with relatively concentrated layout and large population scale, comprehensively consider factors such as terrain conditions and river network distribution, and the daily sewage treatment of single villages or multi -villages in the area.

(3) Location of domestic sewage treatment facilities is generally determined according to the natural geographical conditions of the region, and the length of the pipe network should be reduced as much as possible. Connected to the drainage outlet of a relatively centralized collection system, emphasizing uniform treatment after centralized collection. The choice of sewage treatment technology should be compatible with the economic development level of the village, the villagers’ economic withdrawal ability, and strive to handle the effects stable, reliable, easy to operate and maintain, and economical.

(1) Scope of application

It is suitable for the treatment of villages with relatively concentrated residence, large local water environment capacity, low water quality requirements, and relatively weak village economic foundation. Villages with a drainage height ≥0.2 m can use its terrain gap to avoid the improvement of the pump.

(2) Process process

The sewage collected from the drainage pipe network enters the anaerobic tank through the grille, the elastic fillers in the anaerobic tank, and the biofilm that is attached to the elastic fillers such as the biofilm that is attached to the elastic filler. The anaerobic tank is entered into an artificial wetland after the pump is increased. The water felling oxygen drainage groove and the organic filled artificial wetland are staggered to form a good oxygen and anaerobic alternate micro -environment. Plastic fillers with plastic fillers of organic fillers instead of gravel filler with plastic fillers, planting aquatic plants, and pollutants are removed by microbial degradation and plant absorption.

(3) Technical characteristics

——In organic filler -type artificial wetland with plastic fillers instead of fillers such as gravel, sand, soil and other fillers of traditional wetlands, open holes on the top of the plastic fillers, laid fillers or openings of plastic plants above the board, plant aquatic plants, sewage according to the guide according to the guide The direction of the flowing direction is purified through the fillers and plant root systems.

—— Each level of wetland bed is different from traditional wetlands. It is divided into two parts, separated by stainless steel wire mesh in the middle. Compared with traditional fillers such as stone, the surface area is larger, which enhances the effect of sewage treatment. This type of wetland is not easy to block, large biomass, high processing load, saving land, and easy maintenance management.

3. Pre-processing-combined artificial wetland

The combined ecological wetland can be used for daily sewage treatment of decentralized or concentrated villages, which are generally suitable for villages with more than 20 households (water volume 10 m3/d). Ecological wetlands can generally borrow the original terrain and height difference. At the same time, due to the good wetland landscape, it is particularly suitable for the transformation projects such as star villages, beautiful villages and other villages, which can increase landscape and multifunctional.

——The combined artificial wetland technology comes from Germany’s ecological wetland technology. It uses a simulated natural way to handle domestic sewage. Facilities are tailored according to the conditions of the village, coordinated with the local ecological landscape, and harmonious with the living environment of the residents. Artificial wetland uses biological, physical and chemical processes to remove and break down pollutants in sewage, and dewater and mineralization of precipitated sludge.

——Is artificial wetlands are not high in equipment, and the technical requirements for managers are also very low. As long as you need to trim the green landscape on the surface of the wetland, the difficulty is similar to farmland management, and ordinary farmers are easy to get started. At the same time, after dehydration and mineralization of sludge by using artificial wetlands, they can return to the field and save resources. The completion of the wetland itself is a kind of landscape, coordinating with the environment of the village, enriching the amount of rural greening and attractions, and can also play a role in regulating rainwater runoff.

The first is low cost. It only needs to be equipped with a pump, no aeration device, less electric equipment, and the tons of water operations containing labor costs is between 0.1-0.3 yuan. The villagers can operate and maintain the wetlands; the third is long life, the service life is more than 15 years; the fourth is the beauty of the landscape, creating a beautiful landscape, and can become a small tourist park in the village.

It is suitable for living sewage treatment in rural and small rural tourist attractions in the plains and hills.

After the sewage is collected, enter the adjustment tank, and the pump intermittently enters the scattered water pipes that enter the penetration bed. Enter the wetland and underground filtration unit through the scattered water holes. Move downward, some sewage flows in the middle of the scattered gravel layer, and enters the lower blocking layer by connecting the gravel of the dispersion water layer and the ventilation layer. During the flow of sewage, the particles of particles in the water are intercepted by the fillers of different particle size and are decomposed and transformed by microorganisms. After the treatment, the water is gathered at the bottom of the filtration field, and it is discharged through the water collection and drainage pipes or entered the clearing pool.

The first is that the construction investment is small, the operating cost is very low, there is no second pollution, and the sludge is not discharged; the second is that there is no complex equipment, the system maintenance is simple, and the special land is not required. Drought land, parking lots or sports venues); Fourth, no noise, basically no odor, does not affect the surrounding environment and landscape, can be built in the crowd’s place of settlement; fifth, the system is set to underground, which is less affected by climate conditions; Hydropower impact capacity is strong, water quality is stable, and medium water can be used back.

It is suitable for villages with certain economic affordability. It can build multiple sewage treatment facilities or village sewage treatment stations. In order to reduce the aeration and power consumption and reduce operating costs, the height difference between the terrain should be used to replace the aerated oxygen by falling water and composing oxygen.

——Se multi -layer biological filter diagram Multi -layer biological filter (MLBF) combines ecological concepts with engineering technology, adopts advanced engineering methods to accelerate water body repair, and uses biological fillers to combine artificial enhancement means a kind of domestic sewage dispersing treatment Proprietary technology.

——The biofiles of multi -layer biological filters are between organic fillers and inorganic fillers, and it is easy to cultivate rich microorganisms. The pollutants entering the multi -layer biological filter are first cut and adsorbed by the biological fillers. The excellent hydropological characteristics and physical and chemical characteristics of the water system and biological fillers are the special microorganisms in the filler. The aerobic environment enables different microorganistic species to grow metabolism efficiently, and the intermittent operating method makes the growth rate of microorganisms grow dynamic balance and the system does not require muddy discharge facilities when runtime.

——Basing for production and preparation with microbial fillers, small gravel, pottery, etc., the source of raw materials is wide and easy to obtain.

——A anaerobic-hypoxic-Antoxyglier combination, complete the removal of organic matter and nitrogen and phosphorus nutritional elements in a processing structure.

——The intermittent operation method, no remaining sludge, no secondary pollution and saving the cost of surplus sludge disposal costs.

——The surface compounding of oblique fans instead of the traditional Rotz fans exposed the air charging system. The system simplifies, and the energy consumption is greatly reduced.

——The processing system is simple, and unattended can be achieved by simple and automatic control.

—— The surface of the MLBF pool is sealed by HDPE membrane anti -seepage material to effectively prevent sewage leakage into the soil and cause secondary pollution. At the same time, due to the full sealing of the pool body, the secondary pollution problems such as mosquito flies and odor are effectively controlled.

—— For the drought -deficient area, the MLBF process+water reuse mode can effectively alleviate the contradiction of water resources shortage.

——In the landscape design formation of ecological landscape with the surrounding environment.

——The technical advantage of MLBF technology integrates emerging Internet of Things technology.

——The operating maintenance fee is only very low, and there is no other fee.

The shortage of land resources, good economic conditions, guaranteed construction funds and operating costs, high concentration of water inlet pollutants, large treatment scale, a certain capacity of the local water environment, and moderate water discharge requirements.

The pre -processing unit in this process can choose a septic tank, anaerobic biological filter, or the first sinking pool; the oxidation ditch can be an integrated oxidation groove or PASVEER oxidation groove.

This process has a good COD and SS removal rate, a better nitrogen dehydration effect. At the same time, it has certain phosphorus removal capacity. The water out of water is better, which can be directly discharged or irrigated farmland. This process is not suitable for dealing with low concentration sewage.

This technology is not only applicable to the relatively flat areas, plains or terrain, but also in areas such as mountainous areas such as mountainous areas. Depending on the population scale, the degree of settlement, and the characteristics of the terrain, it can be suitable for decentralized sewage treatment systems and relative centralized sewage treatment systems.

When the phosphorus in the water is high, the aluminum/iron electro -electrode is installed in the overwater channels in the oxygen area and the sedimentation area, and the phosphorus is used to remove the phosphorus. In the case of power -powered, the phosphorus in the water is removed by analyzing the combination of iron ions and aluminum ions with the positive phosphate in the water. There is a slow -release chlorine tank installed at the final outlet of the equipment. After disinfection through chlorine tablets, most of the germs are killed and the water out of the water meets the discharge requirements.

The equipment that uses A/O biological contact oxidation technology includes three functional segments: hypoxia, good oxygen, and precipitation. Special fillers are set up in hypoxia and oxygen function segments. The oxygen supply equipment of the good oxygen segment is an electromagnetic drum, which has low energy consumption, low noise, and large air volume. It can achieve three effects: aeration, backburning, and gas reflux. The equipment is disinfected with electrolytes and chlorine pieces, and the quality of the water out of water has reached the first-level B standard of the “GB18918-2002) of the” Urban Sewage Treatment Plant “(GB18918-2002).

1. Applicable object

2. Pre-processing-artificial wetland

4. Pre-treatment-soil penetration

5. Pre-treatment-Biological Filter-Artificial Wetland

6. Pre-treatment-oxidation groove

7. Pre-treatment -A/O biological contact oxidation

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(1) Scope of application

(1) Scope of application

(1) Scope of application

(1) Scope of application

(1) Scope of application

(2) Process process

(2) Process process

(2) Process process

(2) Process process

(2) Process process

(3) Technical characteristics

(3) Technical characteristics

(3) Technical characteristics

(3) Technical characteristics

(3) Technical characteristics

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