CN111018071A

CN111018071A - COD remover

Info

Publication number: CN111018071A
Application number: CN201911365621.9A
Authority: CN
Inventors: 陈旭东; 杨畅; 杨红; 刘伏兰; 王凤艳; 李泽群
Original assignee: Liaoning Xinlong Technology Co ltd
Current assignee: Liaoning Xinlong Technology Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-04-17

Abstract

The invention provides a COD remover. Dissolving 20-25% of polyaluminium chloride, 25-30% of polyferric sulfate and 5-10% of water glass in water at the temperature of 40-50 ℃, adding sodium chlorite for multiple times for polymerization reaction for 2-6 hours, preferably 3-4 hours, heating to 75-85 ℃, curing for 8-12 hours, filtering, curing, and obtaining the COD remover. The aperture of the filtered solution is preferably 200-800 meshes; the curing temperature is 75-85 ℃, and preferably 80 ℃. The COD remover has high sewage treatment efficiency, the treatment rate reaches more than 90 percent, and the COD remover has less impurities, is easy to perform subsequent treatment, and is safe and nontoxic. Is suitable for being used as a COD treating agent for sewage treatment.

Description

COD remover

Technical Field

The invention provides a water treatment agent in the field of environmental protection, and particularly relates to a COD (chemical oxygen demand) remover.

Background

At present, the common methods for treating the excessive COD of the sewage comprise: adsorption, flocculant, oxidant, microbiological, etc.

1. Removing COD by an adsorption method:

the method is to adsorb and treat granular organic matters and chromaticity in sewage through active adsorption materials such as active carbon, macroporous resin, bentonite and the like. The main disadvantages are: only used as pretreatment in the early stage, reduces COD which is easy to treat, has low removal rate and can not reach the sewage discharge standard.

2. Removing COD by a flocculant method:

the chemical coagulation method can effectively remove organic matters in the wastewater and reduce the COD of the wastewater to a great extent. The chemical coagulation method is a method for purifying water by adding a flocculating agent into wastewater, utilizing the adsorption bridging, double electric layer compression and net catching effects of the flocculating agent to destabilize, mutually collide and coagulate colloids and suspended matters in water to form flocculating constituents, and separating particles from the water by using a precipitation or air flotation process. The main disadvantages are: the chemical treatment objects are mainly organic matters and inorganic matters in the sewage, and have little effect on microorganisms and N, P; the produced sludge is more, the final sludge disposal flow is more troublesome, and the operation cost is high.

3. Removal of COD by an oxidant method:

the method is a method for oxidizing and decomposing pollutants in the wastewater by using a strong oxidant (O3) so as to achieve the aim of purifying the wastewater. Through chemical oxidation, inorganic matters and organic matters in the wastewater can be oxidized and decomposed, so that COD (chemical oxygen demand) of the wastewater is reduced, or toxic and harmful substances in the wastewater are harmless. The method has high COD removal rate (> 70%) and less sludge; however, the method only has certain significance for treating the leachate which is difficult to degrade and has small water quantity and low content, and the research in the field has a plurality of problems, such as the search for more efficient catalysts and the separation and recovery of the catalysts.

4. Removing COD by a microbiological method:

the biological method is a waste water treatment method which utilizes microbial enzyme to oxidize or reduce organic molecules and destroy unsaturated bonds and chromophoric groups of the organic molecules so as to achieve the purpose of treatment. Due to the rapid propagation rate of microorganisms, strong adaptability and low cost, the method is widely applied to the treatment of the scouring wastewater in recent years. Biological methods can be classified into aerobic biological methods and anaerobic biological methods according to the reaction mechanism of biological treatment. The advantages are that: the microorganism has the advantages of high efficiency, no toxicity, no secondary pollution and the like in the sewage treatment process. The disadvantages are that: the process flow is complex, the one-time investment for transformation is large, and the construction difficulty is large; the pretreatment requirement on sewage is high, and if excessive suspended matters exist in the inlet water, the loss of a water head of the reactor is easy to rise to cause blockage; the total energy consumption is high and the operation cost is high.

Disclosure of Invention

In order to provide a COD remover, the invention solves the technical problem of COD treatment and purification in sewage by compounding polyaluminium chloride, polyferric sulfate and water glass.

The technical scheme adopted by the invention for solving the technical problems is as follows:

dissolving 20-25% of polyaluminium chloride, 25-30% of polyferric sulfate and 5-10% of water glass in water at the temperature of 40-50 ℃, adding sodium chlorite for multiple times for polymerization reaction for 2-6 hours, preferably 3-4 hours, heating to 75-85 ℃, curing for 8-12 hours, filtering, curing, and obtaining the COD remover.

The aperture of the filtered solution is preferably 200-800 meshes; the curing temperature is 75-85 ℃, and preferably 80 ℃.

The positive effects are as follows: the COD remover has high sewage treatment efficiency, the treatment rate reaches more than 90 percent, and the COD remover has less impurities, is easy to perform subsequent treatment, and is safe and nontoxic. Is suitable for being used as a COD treating agent for sewage treatment.

Detailed Description

The technical principle is as follows:

polyaluminium chloride and polyferric sulfate are metal composite salt, have the water purification effect, make COD in the sewage and the impurity of metal ion carry out the dual function of mixed purification and flocculation under the effect of water glass solution, so can make and handle COD efficiency and can improve by great degree low.

Performance indexes of the COD remover are as follows:

the appearance is reddish brown liquid;

the effective content is more than or equal to 60 percent;

the metal ion impurity is less than or equal to 0.1 percent.

Experimental data

The COD remover utilizes the strong oxidizing property thereof to destroy and change stable chemical molecular structure in the waste water, and collects flocculation, absorption, bridging, roll sweep and deposit etc. and be multi-functional in an organic whole, when getting rid of organic pollutant by a wide margin, greatly improves the biodegradability of waste water, and low-cost realization sewage is discharge to reach standard, thereby reaches the purpose of effectively getting rid of COD.

The advantages are that:

1. the product has strong adaptability to the change of the temperature, turbidity, alkalinity and organic matter content of raw water, has good effect on removing COD, chroma and peculiar smell in water, and can ensure that the removal rate of COD in the wastewater is more than 90 percent. Compared with other COD medicaments, the treatment effect is higher.

2. The method has wide application range, does not need to change the treatment process, does not increase the hardware investment of the sewage treatment system, can be directly added into the existing treatment process, and is very convenient to use.

3. The removal effect of the high-efficiency COD remover on organic wastes is more than twice that of similar products in the market, the addition amount of chemicals is less, the generation amount of sludge and the sludge treatment cost are greatly reduced, and the total cost is low.

4. Compared with the conventional chemical treatment method, the method has smaller sludge amount.

5. The reaction is quick, safe and nontoxic, and has good medicament compatibility and no secondary pollution.

6. The novel efficient COD remover can be widely applied to treatment of various industrial wastewater such as printing and dyeing, chemical engineering, electroplating, pulping and papermaking, pharmacy, wool washing, pesticides and the like and treated water recycling engineering, meets the national energy-saving and emission-reduction requirements, can avoid a great deal of influence of traditional chemicals on water quality, and is well adapted to meet market demands.

Claims

1. A COD remover is characterized in that:

dissolving 20-25% of polyaluminium chloride, 25-30% of polyferric sulfate and 5-10% of water glass in water at the temperature of 40-50 ℃, adding sodium chlorite for multiple times to perform polymerization reaction for 2-6 hours, preferably 3-4 hours, then heating to 75-85 ℃, curing for 8-12 hours, filtering, curing to obtain a COD remover;

the aperture of the filtered solution is preferably 200-800 meshes;

the curing temperature is 75-85 ℃, and preferably 80 ℃.