Application of flocculant in sewage treatment

Flocculants can be divided into inorganic flocculants and organic flocculants according to their chemical composition. The inorganic flocculant further comprises an inorganic coagulant and an inorganic polymer flocculant; the organic flocculant further comprises a synthetic organic polymer flocculant, a natural organic polymer flocculant and a microbial flocculant.

Main application of flocculant in sewage treatment

First, the chemical precipitation method:

The so-called chemical precipitation method is to directly add a cyclodextrin-based flocculant or the like to the wastewater to directly react with the target pollutants present in the wastewater water body to form a precipitate that is not easily dissolved in water and contaminate the target. The method of separating and removing contaminants by isolation. However, chemical methods generally involve the addition of large amounts of chemicals and precipitate as precipitates. In this process, the chemical will survive and carry a large amount of pollutants after chemical treatment, causing secondary pollution and damage to the water body. Therefore, there is a breakthrough in this technology in the future.

Second, the electrolysis method:

The mechanism of electrolysis is applied to make the harmful substances in the original wastewater water environment undergo direct oxidation reaction and reduction reaction to become harmless substances through the electrolysis process on the positive and negative electrodes, respectively, to realize the method of purifying the wastewater. Indirect oxidation and indirect reduction may also be employed, that is, the oxidation and reduction products of the electrode are used to separate harmful substances in the wastewater to separate and remove harmful substances. This method allows the factory to use the low-voltage power supply to take materials locally, and operate at the normal temperature and pressure of the factory, which is convenient and safe to operate. But the problem is the power consumption and the consumption of large metal electrodes when handling large amounts of wastewater, the precipitated material separated easily using the process. This requires proper handling and placement of the sediment.

Third, the ion exchange method:

The ion exchange method can effectively treat and recover heavy metals in wastewater, turning waste into treasure. However, the material agent is easily contaminated, and once it is scrapped, the recycling effect is poor, and the wastewater treatment cost is increased, resulting in waste of resources.

Fourth, the adsorption method:

The adsorption method utilizes a porous solid drug material, such as activated carbon, activated coal , coke , cinder, resin, wood chips and the like, to adsorb harmful substances and pollutants in the wastewater, thereby achieving separation of pollutants from water bodies. Physical adsorption can also be chemical adsorption.

Five, flocculation precipitation method:

The main working principle of the flocculation sedimentation method is to dissolve in an alkaline environment by using an object containing aluminum or iron . After the reaction, a colloidal group can be formed, and the pollutants in the water body can be adsorbed, adhered and wrapped. The deposition of pollutants together with water bodies is a technique for separating target pollutants from water bodies.

Sixth, biological treatment method:

With the development of society and the expansion of industrial scale, there are more and more types of water pollution and wastewater components. The treatment is no longer as simple as it used to be, and it needs to be treated with more scientific microbiological methods. There are substances and environments in which the microorganisms can survive and reproduce in the sewage. Therefore, the microorganisms can obtain life nutrients from the wastewater, and can help to degrade and remove harmful substances while growing, thereby obtaining the effect of purifying the sewage. This method is not only easy to operate, but also low in cost, safe and environmentally friendly, and thus has been widely welcomed and popularized in the wastewater treatment market.

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