What chemicals are used for the wastewater treatment of varnish washing machine

The color of the varnish washing machine wastewater in the printing industry is deep and turbid, and the common agents used to treat this wastewater are generally decolorizing agents, coagulants, and defoamers. These are used in the pre-treatment stage, and in combination with the whole water treatment process, antiscalants, bactericidal algaecides, etc. will be used. Some are directly added to the wastewater, and some are added to the equipment for the treatment of wastewater.

Water treatment agent is a necessary chemical agent in the process of industrial water, domestic water and wastewater disposal, and through the use of these chemicals, the water can reach the necessary quality requirements. Its primary effect is to control the composition of scale and sludge, reduce foam, reduce the erosion of materials in contact with water, remove suspended solids and toxic substances in water, deodorize and decolorize, and soften water quality. At present, due to the rapid increase in water consumption in other countries around the world, various environmental laws (water purification laws) have been promulgated one after another, and the requirements are becoming more and more stringent, so the various types of high-efficiency water disposal chemicals are increasing rapidly.

In China, the contradiction with the increasingly severe water resource crisis is that the production capacity of water treatment agents is very low, and the quality is not regulated, so it is urgent to accelerate the development of China's water treatment chemicals as an environmental protection industry.

Water treatment agents include flocculants, corrosion inhibitors, scale inhibitors, biocides, dispersants, cleaning agents, pre-film agents, defoamers, decolorizing agents, chelating agents, oxygen scavengers and ion exchange resins. Flocculants and biocides will be systematically introduced here.

China's water treatment chemicals were introduced in the 70s after the introduction of large fertilizer devices and gradually developed; Since then, we have developed a series of water treatment agents. The varieties of water treatment agents in China mainly include scale inhibitors, corrosion inhibitors, bactericidal algaecides, inorganic coagulants, organic flocculants and other categories.

The reaction speed is fast, and it only takes half an hour to several hours to treat ordinary industrial wastewater.

It has a wide range of effects on organic pollutants, and has a good degradation effect on refractory organic substances.

The process is simple, the input is less, the service life is long, the operation and maintenance are convenient, the treatment effect is ideal, and the microelectrolytic reactant consumed during treatment is less.

After micro-electrolysis treatment, the wastewater will form the original ferrous or iron ions in the water, which has a better coagulation effect than ordinary coagulants, no need to add coagulants such as iron salts, high COD removal rate, and will not cause secondary pollution to the water.

It has a good coagulation effect, can effectively remove color and COD, and greatly improves the biodegradability of wastewater.

This method can achieve the effect of phosphorus removal by chemical precipitation, and can also remove heavy metals by reduction.

This paper analyzes the opportunities faced by the development of water treatment agents in China, expounds the application status of environmentally friendly water treatment agents, and believes that water treatment agents will develop rapidly in the direction of new high-efficiency water treatment agents such as green water treatment agents, multi-composite water treatment agents, nanomaterials, and microbial flocculants on the solid basis of continuous innovation in coagulation theory.

If it is water-based ink wastewater, the recommended process: grating--- acid precipitation--- filter press--- electrolysis-reuse. In this way, COD does not need to meet the emission standard, and the water after electrolysis is completely colorless, and the reuse and cleaning of the printing machine can be done.

What indicators are you dealing with? COD? The general PAC+PAM effect on ink wastewater is not very good.

It is recommended to use a decolorizing agent for treatment, which is relatively simple to use and has a significant decolorization effect.

Wastewater decolorizer:

Used for textile, printing and dyeing, ink, leather, rubber, coking, papermaking, pharmaceutical and other wastewater decolorization treatment, the general decolorizing agent is polyaluminum chloride, and other metal salts with cations, in addition to high-efficiency decolorizing agent, this decolorizing agent is an organic polymer with a strong positive charge, the dosage is small, the decolorization efficiency is high, can remove the color that polyaluminum chloride can not remove, and make the final water quality reach an ideal state.

Polyferric aluminum chloride is an inorganic polymer coagulant, which is produced as an inorganic polymer water treatment agent with large molecular weight and high charge due to the bridging of hydroxide ions and the polymerization of multivalent anions. Polyaluminium ferric chloride (PAFC) is a composite inorganic polymer water purifier based on aluminum and supplemented by iron, which integrates the advantages of aluminum salt and iron salt, and is a multi-core complex in the middle of aluminum and iron, which is developed on the basis of in-depth research on the hydrolysis and coagulation mechanism of coagulants such as polymerized aluminum and polymeric iron, with a wide range of mixed pH, small corrosiveness, faster floc formation, better adsorption, faster precipitation rate, and enhanced decementing water performance of mud residue.

Commonly used sewage treatment agents are: scale inhibitors, corrosion inhibitors, bactericidal algaecides (water treatment fungicides), cleaning agents, flocculants, dispersants and other water treatment agents.

There are more than 100 varieties of water treatment agents on the market, which are widely used in industrial circulating water, boiler and heating water, oilfield water injection, reverse osmosis membrane and other systems.

Organic phosphine series scale and corrosion inhibitors, organic phosphonates, polycarboxylic acid scale inhibitors and dispersants, bactericidal algaecides, slime sludge strippers, composite special scale inhibitors and corrosion inhibitors (boiler scale inhibitors, heating water corrosion and scale inhibitors, power plant special corrosion and scale inhibitors, oilfield special scale inhibitors), copper and hydrochloric acid pickling corrosion inhibitors, reverse osmosis agents (reverse osmosis scale inhibitors, reverse osmosis cleaning agents, reverse osmosis fungicides) and other water treatment agents.

The phosphorus emission index has been included in the important index leading to water eutrophication in China, and there are strict discharge standards. The phosphorus removal methods are usually biological phosphorus removal and chemical phosphorus removal, and the phosphorus removal cost of chemical phosphorus removal is the lowest and effective, but it also inevitably uses chemical phosphorus removal agent for coagulation sedimentation precipitation phosphorus removal. The types of phosphorus removers are divided into different types of the same kind according to the difference between the coagulation of the agent and the effect of phosphorus removal.

Commonly used sewage phosphorus removal agents.

1. Iron salt phosphorus remover: refers to the iron compound agent, the main phosphorus remover represented by polyferric sulfate, ferric chloride and ferrous sulfate, which is a new phosphorus remover on the market, and its effect is better than other types of agents, among which the removal rate of non-soluble phosphorus in sewage can reach more than 92%. and the latest enhanced phosphorus removers on the market, among others.

Iron ions formed by iron salts dissolved in water can neutralize electronegative colloidal particles in water, and can also react with phosphate to form iron phosphate precipitates. Secondly, phosphorus removers are commonly used, and the iron oxide or iron hydroxide generated by its dissolution in water has a adhesive effect, which can adsorb and precipitate phosphate. In addition, polyferric sulfate is dissolved in water as a polymer to form polynuclear iron hydroxide, which has strong complexation coagulation.

2. Aluminum salt phosphorus remover: represented by aluminum sulfate, polyaluminum chloride and sodium aluminate, the phosphorus removal effect of this type of phosphorus remover mostly depends on the adsorption of aluminum hydroxide, and therefore, it is inferior to iron salt in phosphorus removal. And because of the long-term accumulation of residual aluminum ions in the water body after phosphorus removal, animals and plants will be seriously harmed, and it is gradually withdrawing from the market.

3. Calcium salt phosphate remover: Calcium salt phosphate remover is a phosphorus remover represented by alkaline agents such as lime, flake alkali, and compound alkali. Calcium salt phosphorus removal is to use it to react with phosphate to form calcium phosphate precipitate.

The dosage of this type of phosphorus removal agent is greatly affected by the pH value, the formation of phosphorus, and the calcium content in the water. Moreover, the amount of sludge produced by calcium salt phosphorus removal is relatively large, which increases the difficulty of sludge treatment.

4. Microbial flocculant phosphorus remover: This kind of agent is a non-toxic flocculant agent with strong adsorption flocculation effect extracted after the cultivation of microorganisms. The comparative experiments of Chimelong Technology show that this microbial flocculant has the flocculation effect of PAM, and its supernatant is relatively clear, and the solid-liquid stratification is obvious.

Compared with microorganisms, it is very little affected by temperature and pH value, and is an ideal new flocculation agent. However, at present, because the market for microbial flocculants is not extensive and there is no mass production, there are relatively few applications.

Common sewage treatment agents: polyacrylamide, polyaluminum chloride, COD remover, ammonia nitrogen remover, decolorizing agent, special regulator for air flotation machine, demulsifier, fluoride remover, disinfectant, bacteria, etc. (Weifang Zhonghong Environmental Protection Technology is a very good sewage treatment agent manufacturer, with good service attitude and good product quality).

In fact, it can be distinguished from the senses, if the sewage looks dirty, then you need a flocculating decolorizer or demulsifier to make the water clear, if there is a lot of foam, use a defoamer. If it smells bad, use deodorant.

In addition, there are some indicators that cannot be seen or smelled, and various indicators of sewage need to be detected, at this time, phosphorus removers, ammonia nitrogen removers, heavy metal traps, COD removers and so on are needed.

and auxiliary agents that need to be added in sewage treatment: pH adjusters, etc.

As it happens, we've got all of them.

Commonly used water purification agents include polyaluminum chloride, polyaluminum ferric chloride, basic aluminum chloride, ferrous sulfate, aluminum sulfate, polyferric sulfate, etc. Polyacrylamide 1500-3000 a ton.

Paint sewage treatment should use a special agent paint mist coagulant, also known as paint remover or AB agent, paint sewage treatment agent is divided into two kinds: agent A and agent B, by penetrating the paint to make it completely lose its viscosity, the suspended solid paint residue is gathered together, so that the water is more pure, and these paint residues are easily separated from the water quickly.

There are many varieties of sewage treatment drugs, the most.

DU is commonly used as flocculant, and flocculant can be divided.

DAO is an inorganic flocculant and an organic flocculant. Inorganic flocculants are divided into low molecular weight and high molecular weight inorganic flocculants according to the size of the molecular weight. The most widely used low-molecular-weight inorganic flocculants are iron-based and aluminum-based metal salts.

The mainstream of the market are aluminum chloride, ferric chloride, ferrous sulfate and aluminum sulfate.

Polymer inorganic flocculant, inorganic molecular flocculant coagulation effect is high, low, the most mainstream inorganic flocculant agent. The varieties of inorganic polymer flocculants can be divided into cationic type and anionic type according to different ionic degrees. Organic flocculants are divided into ionic and non-ionic types.

Such as polyacrylamide. It is used to accelerate the rapid sedimentation of concentrate in dense ponds.

Paint mist coagulant—

BAI - The circulating water in the coating workshop can make the overspray paint lose viscosity in the spraying operation process, and the spray paint mist will be lost and dispersed to form a solid that is easy to separate from the water, so as to achieve the effect of solid-liquid separation, so as to purify the circulating water body and continue the function of circulating water to absorb the overspray paint mist.

Paint flocculant - used as a flocculant in the treatment process of water-based and solvent-based paint, to promote the flocculation, agglomeration and floating of paint mist particles, which is convenient for separation from water. The product needs to be used in conjunction with the paint mist coagulant, and the dosage is related to the amount of paint mist coagulant.

PH debugging agent and coagulant, etc., you can ask Lichang environment for details, if you don't understand, please continue to ask.

Treatment with demulsifier can break the oil in the water, and then precipitate it by flocculation to make the supernatant clear, and at the same time reduce the color, COD, etc. in the water.

It depends on what type of cutting fluid you are.

If the emulsion process is still very cumbersome, if you are not a large enterprise, it is not recommended to dispose of it yourself, then the cost will be higher than entrusting a water treatment company.

The process is probably demulsifier-flocculant-suspension-acid-base neutralization (in addition, the separated non-water-soluble oil can be sold for money, someone collects it).

Sweep with a soft brush or feather duster, then wipe with a clean cotton cloth or sponge with wet water. If the picture is dirty, you can drop it in water to wash it (in the past, it was often used to use neutral soft soap), and then wipe it with water. Water has little effect on new paintings that are not damaged, but can have a damaging effect on cracked paintings.

In particular, for oil paintings with rubber soles, the water in the cotton cloth must be squeezed clean before wiping. In Europe, non-water solvents such as turpentine are commonly used when cleaning masterpieces left by predecessors. Although turpentine has no solubility to the oil film, it can dissolve resin varnish, and all works that are varnished with resin varnish need to be re-varnished after cleaning with turpentine.

Oil paintings will inevitably turn yellow and dark during the preservation process, which is the result of oxidation of the surface varnish. So far, there is no varnish that will not be oxidized, and removing the old varnish layer and re-varnishing it is the only way to restore the original appearance of the work. Commonly used cleaning solvents are:

1. Turpentine. It has a weak effect on old oil paintings, but a strong effect on the new color layer, especially after heating with hot water.

2. Refined gasoline and benzene (toluene, xylene). The solubility of resin is stronger than that of turpentine.

3. Ethanol (anhydrous alcohol) and methanol (wood alcohol). It is a strong solvent for resins.

4. Acetone and chloroform. It can quickly dissolve resin and oil layers. The cleaning agent of the art supply store** is generally a mixture of several solvents, and strong solvents cannot be used alone.

Modern oil paintings mostly use resin varnish, which can be cleaned off with turpentine. The older generation of oil painters in China mostly use oil-based varnish, which requires a mixture of turpentine and anhydrous alcohol. Whereas, acetone is only used as an additive when cleaning ancient works.