KR20000018028A - Waste-water tretment system of foaming generater - Google Patents

Abstract

PURPOSE: To improve the efficiency of chemical or biological treatment, bubbles are produced, so times for activating and dehydrating are reduced. CONSTITUTION: A reactivating tank has inlets for supplying air and microorganism agent, and waste water is mixed promptly in the tank to make bubbles. Chemical and biological reactions are occurred in short time by enough contact with air. Wastewater goes through screen and flows into storage tank(11). An air compressor(15) supplies appropriate amount of air using impeller which is installed in the reactivating tank(16). A pump(14) supplies agent, so bubbles are produced in the reactivating tank and exhausted through outlet(17). A pump(12) has a function for controlling the amount of waste water. Bubbles are produced without adding a surface active agent in the tank, and odor can be removed by adding catalyst.

Description

Waste water treatment system by foam {WASTE-WATER TRETMENT SYSTEM OF FOAMING GENERATER}

As the industry develops, the problem of wastes and wastewaters due to the production of products is increasing day by day. As the system for treating wastewater is being studied in earnest, the system is recovering valuable valuables from the wastewater, and the systems that can be reused such as the introduction of the concept of non-discharge system or sewage without the discharge of wastewater.

However, although the primary treatment should be basically accompanied by chemical treatment or biological treatment, there was no significant change in the system for chemical treatment. This has only been limited to the development of chemicals, and research on reactors and systems is insignificant.

In addition, in biological treatment, reactors using microbial carriers, reactors with increased contact area with microorganisms, and closed tanks are the mainstream, and there are very few reports on the reactors themselves.

In the treatment of wastewater, chemical treatment is mainly used to lower chemical oxygen demand by using chemicals, and is mainly used to remove other heavy metals or surfactant equivalents. Frequently, inorganic coagulants and organic polymer flocculants are mainly used to induce this reaction, and sometimes redox neutralizers are used. This reaction mainly uses a reaction vessel having a constant size, and in some cases reactants are removed by inducing reaction in the piping line and sedimentation or flotation in the sedimentation tank or flotation tank to separate the solids.

However, in many cases, unreacted substances may be generated in these reactions, but an increase in chemical oxygen demand may be caused by excessive use of drugs. In addition, the separated solids due to the use of excess chemicals may contain excessive amounts of complex salts, causing secondary pollution when the sludge is disposed of, and the cost may increase due to the overuse of the chemicals.

In the case of biological treatment, it is mostly composed of an aerobic tank and an aerobic tank, and it takes a large site area, and closed reactors also have low treatment efficiency and large tank capacity in consideration of residence time.

These problems, namely, by inducing a sufficient reaction in the reactor to accelerate the reaction by continuously removing the resulting product according to the reaction it is possible to increase the chemical treatment efficiency while reducing the input of chemicals.

In the case of biological treatment, it is necessary to supply sufficient air to the aerobic tank to increase dissolved oxygen, but to increase the area of contact between wastewater and microorganisms rather than to increase the amount of air accompanying it. By making it wider, it is possible to increase dissolved oxygen even with a small amount of air injection.

1-Chemical treatment system schematic according to the present invention

Figure 2-Schematic diagram of a biological treatment system according to the present invention

In order to induce this reaction, the reactor was in a special form. In other words, the reactor was formed in the inlet of the wastewater and the air supply chemical or microbial supply inlet and stirred at high speed to generate bubbles. As a result, chemical reactions and microbial reactions occur in a short time through sufficient contact with air in the reactor, and sediment or floating matters are continuously pushed out by the force of the foam as the result of the reaction. Will be. In particular, high concentrations of organics cause a kind of saponification reaction by adding an alkali agent. Thus, bubbles are generated in the reactor without the addition of a surfactant, and in contact with air, the oxidation reaction is promoted and the odor is also removed by adding a catalyst. Can be.

In the case of biological treatment, the amount of dissolved oxygen can be adjusted even with a small amount of air supplied to the reactor, and the amount of air can be easily adjusted even when the load of contaminants increases, and this can be automatically operated in connection with a pressure gauge.

Referring to FIG. 1, when the generated wastewater flows through the coarse and fine screens and enters the sump tank 11, an appropriate amount is introduced into the reactor by the pump 12, and the impeller in the reactor 16 rotates at a high speed by the motor 13. Compressor 15 will supply the right amount of air. When the chemical is initially supplied by the chemical supply pump 14, bubbles are generated in the reactor and bubbles are discharged through the outlet 17. Once a batch of foam begins to be discharged, the pump 12 is turned on to regulate the intake of a certain amount of wastewater to induce sufficient chemical reaction.

In particular, the chemicals injected at this time may be foamed only by administering an inorganic coagulant or an alkaline agent and there is no need to add separate polymer flocculants. The trapped liquid is discharged through the filter 18.

In the case of biological treatment, an anaerobic tank 20 may be separately provided, and in the case of a small capacity, an anaerobic tank may not be configured separately, but an inlet of air supplied to the reactor may be installed at the rear stage. In addition, by allowing the outlet pipe to be returned to the return feet 30, the microbial outflow is reduced, which reduces the supply of microorganisms.

In particular, the liquid to be returned contains bubbles and slurries, and the depleted liquids may be introduced into the flow regulating tank 27 and then filtered through a filter 28 or the like to be discharged.

It improves the reaction efficiency of chemicals that were difficult to expect in the existing chemical treatment process, and solid-liquid separation is possible only by filter or solid-liquid separator without administration of coagulant. In the activated sludge process, nitrification, which was difficult to expect in an aerobic tank, can occur well, which is advantageous for nitrogen removal. In addition, it is possible to flexibly cope with load fluctuations by increasing the motor rotation speed of the reactor and adjusting the supply air volume, and no additional nutrient supply is required in the case of poor load, which was difficult to expect in the conventional treatment method.

In addition, since the excess sludge adheres to the foam and is discharged, the dewatering property is improved, so that dehydration is possible without administration of the flocculant. When the foam is broken, the filtrate can be discharged without worrying about solids or suspended solids.

Claims (3)

Foamed Wastewater Treatment System The system according to claim 1, wherein the reactor generates bubbles by rotating the impeller and supplying air. The system according to claim 2, wherein the structure of the impeller is in the form of a disk or a perforated plate drum.