Hazard of bubbling in circulating water treatment

(1) Excessive foam leads to thorough sewage treatment, which cannot meet the detection standards of environmental Protection Bureau, and can not be discharged, slowing down the process;

(2) Too much foam spills over from the surface, causing serious pollution of the external environment;

(3) too much foam, water treatment appearance is too ugly;

(4) Too much foam in the aeration or oxygen supply of biological water treatment will affect the progress or overflow of water treatment, affecting the active mud and bacteria;

(5) Too much circulating water foam affects the secondary utilization and production schedule.

Methyl silicone oil defoaming agent of silica: silica gel, gas phase silica, precipitated silica, silica sol and quartz powder. Because of the large surface area and small density of gas phase silica, it is easy to disperse. Without hydrophobic treatment, it shows hydrophilicity and is difficult to be infiltrated and dispersed in the organic phase, which helps to enhance the dispersion ability of silicone oil in the foaming system and increase the stability of emulsion! Therefore, we choose the combination of gas phase silica and methyl silicone oil to improve the defoaming effect of methyl silicone oil.

3methods:

1 smear method: silicone oil and silica compound defoaming agent. Generally it cannot be added directly to the foaming fluid. It can be applied by means of coating, such as: on the nozzle of the bottler, the top of the container or the edge of the upper inner side, and ti can also be applied on the metal mesh, gauze, glass wool, placed above the foaming liquid level. A common way to block foam is to dilute or emulsify it in water with an organic solvent.

2Solvent method: simply add organic silicon liquid or compound of organic silicon liquid and white carbon black directly to water system. It is difficult to disperse and cannot play a full role. The organosilicon product is dissolved in a hydrophilic solvent, such as glycol glycerol or other lower alcohols, and sometimes in alcohol-phenol. It is equal to the dissolved silicone in a slightly dissolved solvent in water. With the diffusion of hydrophilic solvent, and into a certain degree of dispersion of liquid beads, so as to play the role of defoaming.

3Emulsification: In recent decades, the widely accepted and developed method is the emulsification of polysiloxane liquid to make defoamer for water systems.

Why does reverse osmosis have a lot of foam? Because there are a lot of foam material in wastewater effluent, such as mixed with several kinds of surface active agent.Surfactant can make the water bubble to produce, after all, water is a liquid, and It doesn’t have the purification ability of foam. Hence defoamer is necessory to solve foam problem

How to Choose defoamer for reverse osmosis water treatment?

Polyether(ester) defoamer is recommended. Because a part of the organic silicone components will have a certain effect on the osmotic membrane, but polyether don’t have this effection.

The Knowledge Of Antifoams For Wastewater Treatment, Pulp And Papermaking. Why antifoam for pulp and paper will be also explained. After explanation, you will learn more for the industrial effluent treatment.

Wastewater treatment antifoam

Paper mill waste water discharge has always been a more serious problem, so the waste water treatment is also concerned about the point.When it comes to wastewater treatment, it is to use some physical methods, chemical methods and biological methods to treat wastewater, in order to achieve the purpose of purifying water resources and reducing emissions of pollution.

Due to the rapid growth of urban population, the problem of industrial wastewater treatment has become increasingly prominent.And the paper mill waste water discharge is large, so the national standards for waste water discharge are also very strict control, which makes some paper mills in the waste water discharge must be wastewater treatment. In the process of treating wastewater, foam always appear, so it will affect the growth of aquatic organisms, and the operation of the treatment process .In view of this problem, only need to add wastewater treatment defoaming agent in the treatment of wastewater can be a good solution to a series of problems caused by foam.

Wastewater treatment defoamer, with good defoaming speed, can inhibit foam for a long time.Foaming systems for multiple industries have a very good role.For example, pharmaceutical, paper mills, leather printing and dyeing municipal sewage treatment process and chemical cleaning produced foam.Wastewater treatment defoaming agent adopts environmental protection formula, the product itself has the characteristics of non-toxic and harmless, does not affect the reproduction of bacteria.

Wastewater treatment defoamer is a kind of efficient defoamer, which is mainly made of modified silicone polyether and modified siloxane.

Characterictics of antifoams in paper mills

The process of paper making is mainly divided into two steps, one is pulp washing black liquid and the other is paper making. No matter which step, it is inevitable to produce foam, so the need to use defoaming agent for processing, there are many classification of antifoams.

Pulping process, due to the pulp contains the natural substance, such as fatty acid, resin acid washing pulp after cooking liquor, chemistry will generate fatty acid soap, foaming material such as fatty acid soap. A large number of bubbles will give cleaning conveyor and the subsequent bleaching pulp quality brings some trouble to decline, so you need to use defoamersfor processing. The anti foams used in the pulping process mainly include hydrocarbon defoaming agents and silicone emulsion defoaming agents.This kind of defoaming agent can quickly eliminate the foam produced by lignin and some surfactants, and the use effect is especially obvious when pulping and washing.

For paper making process, if you do not solve the paper making process generated foam, it will lead to paper breaking, white water level fluctuations, pump frequency fluctuations, etc, directly affect the stability and quality of paper production. Defoamer agents in paper mills can effectively inhibit white water foaming, at the same time for the fine bubbles between the fibers, the foam on the surface of the pulp can be eliminated.Defoamers can also dissolve the air in the pulp, eliminate bubbles on the water surface, so you can avoid the formation of holes, and reduce the overflow of broken paper and pulp storage pool. So as to ensure the loss of pulp fiber and chemicals, and the paper uniformity and quality are improved.

Antifoams in pulp wshing balck liquor

Mainly used in the control of alkali pulp, paper washing pulp, bamboo pulp, cane pulp, neutral pulp, paper pulp, paper pulp rinsing, screening, bleaching, water treatment, plant fiber pulp produced in the production of foam.

It has the following characteristics:

1, strong defoaming, foam breaking;

2, quickly and thoroughly improve the filter drainage;

3. Good intersolubility in black liquor, suitable for the production conditions of pulp mills;

4, can improve the rinsing efficiency;

5. Reduce salt loss and improve pulp quality;

6, reduce the content of bleaching chemicals, to meet the environmental requirements;

7. The raw material is biodegradable, non-toxic and harmless.

Anti foams in paper process

Antifoam agent for paper making is used in white water for paper making.The surface foam containing rosin gum, the bubbles adsorbed on water fibers, the surface foam containing water with modified starch white water system, the surface foam containing  polyacrylamide retention agent system and the surface foam containing AKD emulsion white water system were removed. Fatty alcohol defoamers and polyether foam controls are good choice.

Its characteristics mainly include:

1, fast elinibating foam speed,  foam inhibition for a long time;

2, good dispersion, dynamic defoaming, no silicone;

3, with good product stability.

What factors affect the defoaming effect of defoaming agent?

Defoamer is widely used in all walks of life. Defoamer t is divided into oil and water. Different industries use different kinds of defoaming agent.Defoamers in pulp and paper industry can effectively control pulp and foam overflow and improve the quality of paper making.

First, long-term effect:

1 defoamer is increased by surfactants, such as in the beginning, the antifoam effect is better, but placed for a period of time , the effect will be greatly reduced.

2 The main agent performancet of defoamer can be absorbed by colloidal resin.

The applicable pH range of defoaming agent:In the environment of strong acid and strong alkali defoamer is relatively strict, then it is necessary to explain the carrier environment to the manufacturer of defoaming agent.

Two, the applicability of the machine:

Temperature of use of defoamer.The change of temperature will lead to the change of foaming stability and defoaming effect of the defoaming agent surfactant.

2. Customer habits.

There are written defoaming agent in the production of the time, the factory internal test is pass, but often have customers complain about the use of poor effect. It was not until after the customer used the site to check that the conclusion was drawn, because the customer diluted too much when using, at the same dilution degree, the decline of foam stability of emulsifier and wetting agent and the decline of defoaming ability of defoaming agent is inconsistent.You keep diluting it so that it tends to produce more bubbles.

Three Packaging, storage and transportation:

Defoamer should be stored away from light and sun exposure.

Application of water-based defoaming agent in environmental protection

The main components of water-based defoamer are dimethyl silicone oil, white carbon black, emulsifier, etc. Using emulsification technology to make these raw materials into water emulsion dispersive defoamers.These raw materials have the characteristics of non-toxic and fast dispersion, fast defoaming and long time of inhibition when used and stable without stratification.

Waterborne defoamers for polyvinyl chloride resin, textile printing and dyeing, petrochemical, metal processing fluid, biological fermentation, water treatment, medicine, food fermentation industry has a very good defoaming effect.

In the process of effluent discharge in the factory, too much foam in the water can not pass the test, and is unable to meet the discharge standards.Thus, emissions cannot slow down the production rate.At this time, the sewage treatment of antifoam has played a vital role.The sewage can be discharged normally after the effluent is treated with defoamers. Defoamers in the process of sewage treatment, can quickly defoaming, foam inhibition for a long time. In the water, defoamer can quickly disperse, and liquid leveling is not easy to break emulsion bleaching oil blend.

Anti foam is needed for pulp process, paper making process, until their waste water treatment, even waste water treatment both line of pulp and paper making process. The requirement of antifoaming is more higher.

In the process of sewage treatment, defoaming agent should be added as far as possible in accordance with the regular use method of defoaming. When adding defoaming agent, attention should be paid to the following points to reduce the amount of defoaming agent and the effect will be better:

1. Add defoaming agent, stir and disperse evenly, so that the defoaming agent can play a continuous defoaming ability.

2. In the process of adding, it is recommended to use a metering pump to add continuously, which makes it easier to control the amount of adding.

3. Pay attention to the added temperature, such as some defoaming agent to be added at low temperature when the effect is better.

4. Pay attention to the amount added, and conduct on-site test according to the defoaming situation.

Due to the influence of sewage environment, temperature, system and composition of various enterprises, there are more and more types of defoaming agents for wastewater treatment at present, which are more and more detailed. It is suggested that the system should be tested first before use, and the test effect is good before use in the system.

No matter which process of water treatment, Rickman expert could provide you the most suitable defoamer solutions for you with the excellent and stable performance.