How to treat Formaldehyde-containing wastewater?

As a Formaldehyde Production Plant, share with you.

Industry background introduction:

In addition to a large amount of formaldehyde, formaldehyde wastewater also contains substances such as alcohol, benzene, phenol, paraformaldehyde, and methylal. Low concentration of formaldehyde can inhibit the growth of microorganisms. High concentration of formaldehyde can denature proteins and it is difficult for microorganisms to survive.

Introduction of common processes for formaldehyde wastewater treatment:

1. Oxidation method: There are reagent oxidation, ozone oxidation, micro-electrolytic oxidation, strong electrolytic oxidation, photocatalytic oxidation method, wet oxidation, ultrasonic / H2O2 method, ClO2 oxidation method, etc .; the specific use process needs to be based on the actual It depends.

2. Purge method: The formaldehyde is easily soluble in water and has a low boiling point and is volatile. The pretreatment of formaldehyde in production wastewater with steam is carried out to reduce the load of subsequent biochemical treatment and improve the treatment effect.

3. Biochemical method: The formaldehyde is used as the nutrition of microorganisms, and the formaldehyde in the waste water is removed by the biological metabolism of the organism.

How to deal with water outages during production

What should I do if the Formaldehyde Production Process encounters water outages?

There are four general forms of formaldehyde production water:

1. Add water to the top of the absorption tower;

2. Oxidizer waste heat boiler make-up water;

3. Cooling water for circulating fluid cooler;

4. Make up water for tail gas boiler.

In the event of water outages, different treatment methods should be adopted according to the source of the water supply. Generally, the following treatment methods are available:

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1. Start the standby pump immediately;

2. Contact the water supply department;

3. Pay attention to observe the oxidizer waste heat boiler liquid level, tail gas boiler liquid level and absorption tower temperature rise. Reduce production load to maintain production if necessary;

4. The tail gas boiler can be suspended and the tail gas is temporarily evacuated;

5. If the water supply cannot be restored in time within a short period of time, and the liquid level of the waste heat boiler of the oxidizer falls below the lower limit, or the temperature of the absorption tower rises suddenly, it should be immediately stopped.

The tail gas emitted from the production of formaldehyde contains hydrogen and a small amount of combustible gases such as formaldehyde and methanol that are not completely absorbed, and it needs to be sent to the tail gas furnace for combustion. The modified tail gas furnace can be used without a blower, and when the boiler is stopped, the tail gas furnace can be used to directly burn methanol to generate steam for driving. Fast steam production and stable pressure.

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