What is the structure of a wastewater treatment system?

There are many kinds of pollutants in wastewater, and it is not practical to use only one method to treat all pollutants in the water, and wastewater treatment systems generally need to treat wastewater in stages. In general, wastewater treatment consists of three stages: primary treatment, secondary treatment and advanced treatment.

The movie "Seafood Marines", I believe many students have seen it, the beautiful underwater world makes people yearn for it; The frolic among the marine animals, and even the playful chasing and hunting, are all exciting. But when humans invade the ocean floor to catch shellfish babies, especially when industrial wastewater is discharged into the ocean, it's a shame to be like those guys. However, only the emotions of anger and shame are powerless to change reality.

We should further think about how wastewater should be treated.

Wastewater treatment can not only protect the surrounding environment from pollution, but also reuse the treated wastewater, so as to realize the recycling of wastewater. For this reason, the wastewater treatment system was born, and here, let's talk about how the wastewater treatment system is structured. <>

We all know that there are many kinds of pollutants in wastewater, and it is unrealistic to use only one method to treat all pollutants in the water, and wastewater treatment systems generally need to treat wastewater in stages. In general, wastewater treatment consists of three stages: primary treatment, secondary treatment and advanced treatment.

Primary treatment is mainly the use of filtration devices to remove suspended pollutants in wastewater, generally speaking, the use of physical methods such as filtration, sedimentation and other methods are regarded as primary treatment. Although the wastewater after primary treatment can remove some pollutants, it does not meet the wastewater discharge standard.

The wastewater after the primary treatment will be followed by the secondary treatment. The main task of secondary treatment is to remove colloidal and dissolved organic pollutants from wastewater. Biological treatment is the most commonly used secondary treatment.

Secondary treatment can remove 90% of the suspended particles in the wastewater, so the wastewater after secondary treatment can meet the discharge standard. However, these treated wastewater also contain inorganic salts such as nitrogen and phosphorus. <>

Advanced treatment is a must if cleaner treated water is to be obtained. The task of advanced treatment is to further remove inorganic salts from wastewater in order to meet the standards for industrial and municipal water. This means that the wastewater that has been treated is reclaimed water that can be reused.

The wastewater treatment system is roughly composed of the above three parts, and after the treatment of the three processes, the reuse of wastewater can be basically realized, which not only saves water resources, but also plays a role in environmental protection.

If the companies in "Seafood Marines" that discharge sewage into the sea can also use wastewater treatment systems to treat industrial wastewater, the bubble marine world should have a brighter beauty.

Different wastewater treatment systems are generally the same in terms of overall operating processes and treatment processes, but there may be differences in the small details of treatment between different brands of wastewater treatment systems.

Taking Eco laboratory wastewater treatment system as an example, the brand's wastewater treatment system generally includes pH adjustment, heavy metal capture, sedimentation tank sedimentation, oxidation tank oxidation and other processes, but the depth type additionally includes precision filtration device, PVDF membrane separation system, medical type additionally includes BOD COD weakening, sterilization and disinfection device and so on. For questions about wastewater treatment systems, please contact the wastewater treatment equipment manufacturers of Eco Laboratories.

The WFRP-B device consists of five main parts:

Grid grit tank, regulating tank, integrated sewage treatment equipment, sand filter ecological pool, equipment room.

1.Grid grit remover tank: isolate the large debris and floating objects in the incoming water, and at the same time make the larger particles in the incoming water settle down here. Simple grids or mechanical grids can be selected according to water quality conditions. Screening slag and grit are cleaned regularly, and handed over to the municipal government for unified treatment after disinfection.

2.Regulating Tank: Regulate the amount of water and balance the water quality. Improve the impact load resistance of the system.

3.Integrated sewage treatment equipment: the main process is a biochemical process, with built-in sedimentation and sludge return system.

The shell is made of mechanically wound FRP tank body, which is a buried design. The core part of the equipment is the biological contact oxidation section, which adopts the immobilized living cell process and adds an external high-efficiency aeration system to dissolve the organic matter in the water through the life metabolism of aerobic cells, so as to achieve the purpose of purifying water quality. The equipment is particularly suitable for the purification process of domestic wastewater.

4.Sand filter ecological pool: It can be used as an effective supplement to the integrated sewage treatment equipment and carry out advanced treatment of the effluent of the integrated sewage treatment equipment.

The treatment system is a single-level manifestation of the constructed wetland ecosystem. Through the adsorption of substrate, the digestion of microorganisms and the absorption of plants, the effluent water quality is stable to meet the design requirements.

5.Equipment room: There are two blower aerators and PLC automatic control equipment.

The blower aerator is one for use and one for standby, and it is switched to run. All equipment in the sewage treatment station is automatically controlled and switched through PLC control equipment, and automatic protection is carried out for overcurrent, phase loss, overvoltage, undervoltage and other faults.

Instructions:1In the figure, the anoxic tank, biochemical tank, sedimentation tank and disinfection tank are integrated into an integrated sewage treatment equipment.

2.The conditioning tank selectively aerates as needed.

3.The whole process will take the integrated biochemical equipment as the main unit, and according to the sewage quality and quantity and the treatment standards required by the buyer, the other individual units will be added or decreased in total to ensure the long-term and stable discharge of effluent.

The sewage treatment system comprises a water collection basin, a coarse grid, a pump room, a fine grid, an aeration sink sand tank, an oxidation ditch, a water distribution well, a secondary sedimentation tank, a disinfection tank, the collection basin, a coarse grid, a pump room, a fine grid, an aeration grit tank, an oxidation ditch, a water distribution well, a secondary sedimentation tank, a disinfection tank are sequentially connected through a pipeline, the oxidation ditch is also provided with a sludge treatment branch, and the sludge treatment branch comprises a sludge return pipeline, a sludge thickening tank, a sludge dewatering workshop, Described oxidation communication sludge return pipeline is connected with the input end of sludge thickening tank, and the output end of described sludge thickening tank is connected with sludge dewatering workshop by pipeline. This system can effectively treat the sewage, so that the sewage discharge meets the national discharge standards and will not affect the land, rivers, etc.

The sewage treatment system generally includes the following main facilities: sewage collection system, sewage primary treatment system, coarse or eggplant water biochemical treatment system, sludge treatment system, sewage discharge system and automatic control system.

1. The physical precipitation method is generally a method of using a precipitant to adsorb pollutant substances in sewage, and the more important precipitant here is to choose the corresponding precipitant to deal with different polluting substances, and this method generally does not produce secondary pollution.

2. The adsorption method is to use adsorbents to adsorb the polluting components in the sewage to achieve the treatment of sewage, such as one of the most common adsorbents: activated carbon, but the adsorbent is generally a one-time consumable, and the cost may be higher.

3. Extraction method, which generally uses a certain extractant to extract pollutants from water.

4. Membrane filtration method is generally a method that uses a specific semi-permeable membrane to only allow water or pollutants to pass through the membrane, so as to achieve the separation of pollutants.

5. Neutralization method, this is the use of acid-base neutralization reaction in chemistry, the pollutant is generally acid or alkali, and the chemical substance that is opposed to it is used to neutralize it to generate pollution-free chemical salt.

6. Electrolysis method, this method is generally used to treat metal salts, and precipitate metal ions through point delysis to achieve sewage treatment.

7. Generally, it is a method of using the decomposition of microorganisms to convert organic matter into inorganic matter, and finally achieve pollution treatment, which generally requires the use of bacteria, which are divided into aerobic bacteria and anaerobic bacteria, so it is necessary to create a suitable living environment for them according to the characteristics of the microorganisms used.

Wastewater treatment equipment also has different classifications according to use and industry, there are large-scale industrial wastewater treatment equipment, and there are also small indoor laboratory wastewater treatment equipment

Acid and alkaline wastewater: wastewater with strong acid and high pH value.

Heavy metal wastewater: Wastewater with chromium, mercury, copper, silver, lead and other heavy metal substances.

Organic wastewater: such as organic solvents, organic acids, ethers, polychlorinated biphenyls, organophosphorus compounds, phenols, petroleum, oils and fats and other substances.

Inorganic wastewater: Wastewater containing halogen ions and other non-metallic ions.

Biological wastewater: wastewater containing various spirochetes, fungi, brucella, anthrax, etc.

The sewage treatment plant itself treats sewage and wastewater, where does the wastewater come from? Or what kind of wastewater do you mean?