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Detailed application of integrated water purifier in sewage treatment

Source: Xingwote Environmental Engineering Updated: 2019-04-10

The purpose of coagulation treatment with an integrated water purifier is to remove colloids and suspended solids in water. Therefore, the coagulation effect of water is often evaluated by the size of flocs, sedimentation speed, and residual amounts of colloids and suspended solids in water, which affects The coagulation factors include the pH of the water and the amount of coagulant. Ants, water temperature, mixing speed of water and coagulant, impurities in water, contact medium, etc. It has become an important source of water pollution. Waste water discharged into the water consumes dissolved oxygen and is slightly toxic to aquatic organisms, which can cause fish deformities. .

Phosphate solvents can cause eutrophication in water.

The secondary biological contact oxidation treatment process uses push-flow biological contact oxidation, and its treatment effect is better than that of the full-mix or two-stage series-full-mix biological contact oxidation tank. Compared with the activated sludge tank, the volume is small and the water quality is highly adaptable . Anti-shock load, stable effluent water quality, no sludge shrinkage, new elastic flat packing is used in the tank, large specific surface area, easy film formation and microbial removal. Under organic load conditions ?. Washing plant wastewater treatment process detailed description1. SBR method: It has been developed as early as the beginning of the 20th century, but due to the tedious manual management, it has not been promoted and applied. This method integrates extraction, aeration, sedimentation and effluent.

Sequential batch activated sludge process is a process consisting of four or three tanks, which alternately run intermittently in one tank and one tank. Now we have developed some improved SBR processes, such as ICEAS, CASS, IDEA, etc. This integration of the process is simple, because there is only one reaction tank, and no secondary sedimentation tank, reflux sludge and equipment are needed, and there is generally no adjustment tank. In most cases, the primary sink can be eliminated, saving land and investment, resisting shock loads, flexible operation methods, and timely aeration can be arranged. The purpose of dephosphorization and denitrification is achieved under different conditions of anoxic and anaerobic conditions, but because each pool requires an aeration and water distribution system, water extraction is used. Intermittent drainage head loss and pool capacity utilization are not ideal, so they are generally not suitable for large cities. The municipal sewage treatment plant performs comprehensive nitrogen and phosphorus removal operations at the same time as this process, with high maintenance requirements, strong dependence on the self-control operation team, large tanks, and high costs.

The cost of pretreatment wastewater for large-scale integrated wastewater treatment systems is an important part of electroplating wastewater treatment, accounting for about 50% of the total electroplating wastewater. The wastewater contains certain salts, free acids and organic compounds. The composition of wastewater varies greatly with different plating seeds, pretreatment processes and factory management levels. The type of wastewater is pickling wastewater. In the domestic agricultural and sideline food processing industry, the pickling industry has developed rapidly in recent years2. A / A / O (anaerobic and anoxic oxidation) advantages:

(1) This process is a relatively simple simultaneous nitrogen and phosphorus removal process. The total hydraulic retention time and total output area are smaller than those of other processes.

(2) Under the condition of anaerobic-aerobic running alternately, filamentous bacteria cannot multiply, and there is no danger of sludge swelling. The SVI value is generally less than 100.

(3) High sludge phosphorus concentration and high fertilizer efficiency.

(4) No medication is required during operation. To avoid high dissolved oxygen concentration and low operating cost, the two A sections need only be gently stirred.

Disadvantages:
(1) It is difficult to further improve the phosphorus removal effect, and there is a certain limit on the growth of sludge, which is not easy to improve, especially when the P / BOD value is high.

(2) It is also difficult to further improve the denitrification effect. The internal circulation is generally limited to 2Q. It should not be too high, otherwise it will increase operating costs.

(3) Maintain a certain concentration of dissolved oxygen in the sedimentation tank, reduce the residence time, and prevent the anaerobic state and phosphorus release from the sludge.

However, the dissolved concentration should not be too high to prevent the circulating mixture from disturbing the reactor in a short time.

The textile printing and dyeing industry is a major producer of industrial wastewater. Sewage mainly contains textile fibers, grease, salt and various sizes of sewage, dyes, surfactants, auxiliaries, acids and alkalis added to the process, etc. BAF is the third-generation biological filter Pool. It is a real reactor combining biofilm and activated sludge processes. The effluent water quality is high, the processing load is large, and the thin-flow filter (3. Ion exchange resin method. Ion exchange resin is a polymer with corresponding functional groups. Conventional sodium ion exchange resin usually contains a large amount of sodium.

Ions: When the content of calcium and magnesium ions in the water is high, the ion exchange resin can release sodium ions, and the functional groups are combined with calcium and magnesium ions. The content of calcium and magnesium ions in the water is reduced, the hardness of the water is reduced, and the hard water becomes soft water. This is the working process of water softening equipment. When a large number of functional groups on the resin are combined with calcium and magnesium ions, the softening ability of the resin is reduced, and a sodium chloride solution can be used to flow through the resin. The high content of sodium ions in the solution results in the release of calcium and magnesium ions from the functional groups, which bind to the sodium ions, thereby restoring the exchange capacity of the resin. One process is called regeneration.

Due to the needs of actual work, the standard work flow of water softening equipment mainly includes: work (sometimes referred to as water production, the same below), backwash, salt absorption. There are five processes: regeneration, slow rinsing, and fast rinsing. All the processes of different demineralized water equipment are very close, just because of the actual process. For different or controlled needs, there may be additional processes. Any water softening device based on sodium ion exchange is located in these five streams. It was developed on a process basis (where the automatic water softening device will increase the brine refill process).

Water quality characteristics of papermaking wastewater: SS and COD are higher in COD composition, insoluble COD is higher, accounting for more than 60%, soluble COD is low, and difficult to biodegrade. Although there is no black liquor, there are still high concentrations of pollutants and poor biodegradability Features. Reliability: The integrated sewage treatment equipment developed and produced by Shandong Shangqing Environmental Protection Technology Co., Ltd. adopts international advanced biological treatment technology. This process has high removal efficiency and removal. Membrane separation technology MBR membrane bioreactor (MBR) sewage treatment and reuse integrated equipment, with the advantages of membrane bioreactors: good effluent water quality, low operating cost, strong system impact resistance, small amount of sludge, degree of automation High, is a comprehensive device.

It occupies a small area and is easy to integrate. It can be used as both a small sewage reuse device and a large sewage treatment plant. The core processing unit of the station is one of the hotspots in the field of sewage treatment and has broad application prospects.

Aerated biological filter (BAF) is a new type of sewage biofilm treatment technology. D has good denitrification and organic matter degradation effects. It can directly reach the first A standard of the "Emission Standards for Pollutants in Municipal Sewage Treatment Plants" (GB18918-2002) or "Quality of Urban Miscellaneous Water for Urban Sewage Recycling" (GB / T18920-2002). The large particle impurity and suspended matter membrane bioreactor (MBR) is a new type of wastewater treatment technology that combines membrane separation technology with biotechnology. It uses membrane separation equipment to treat wastewater.

The activated sludge and macromolecular organic matter in the biochemical reactor are intercepted to save the secondary sedimentation tank, the activated sludge concentration is greatly increased, and the hydraulic shutdown occurs. The residence time (HRT) and sludge residence time (SRT) can be controlled separately, while the hardly degradable substances are continuously reacted and degraded in the reactor.

The secondary biological contact oxidation treatment process uses push-flow biological contact oxidation, and its treatment effect is better than that of the full-mix or two-stage series-full-mix biological contact oxidation tank. Compared with the activated sludge tank, the volume is small and the adaptability to water quality is strong. . Anti-shock load, stable effluent water quality, no sludge shrinkage, new elastic flat packing is used in the tank, large specific surface area, easy film formation and microbial removal.

1. Low water quality requirements: Only 6-9 PH is required for water quality.

2. Less investment in the project: Due to the advanced technology, the processing equipment has been greatly reduced, and the investment has been reduced.

3. Small footprint: less equipment, compact layout and small footprint.

4. Low operating cost: Due to the unique process, the operating cost is greatly saved.

5. The effluent effect is good: the effluent reaches the national standard.

Chemical treatment refers to the use of chemical principles and chemical action to convert pollutant components in sewage into harmless substances, so that sewage is purified. After chemical treatment, the chemical properties of pollutants change, and with the chemical changes, the food industry The chemical treatment method is that the wastewater includes neutralization, coagulation, electrolysis, redox, ion exchange and membrane separation. Chemical redox is an effective wastewater pollution.