What is acid in water and sewage

Wastewater neutralization

Industrial wastewater has very individual compositions, but is generally rarely pH-neutral. Therefore it has to be neutralized before it can be discharged into the public sewer system or watercourse. The required pH value is between 6.5 and 9. Lower or higher values ​​can damage the sewer system and lead to fish and plant deaths in surface waters.

Especially for industrial sectors with For acidic and alkaline wastewater, wastewater neutralization is therefore indispensable. The neutralized wastewater can then - mostly in connection with a downstream wastewater treatment to remove other substances - be discharged or reused in an environmentally friendly manner in the company.

How wastewater neutralization works

In wastewater neutralization, the pH value that is too high or too low is chemically adjusted in the water. There are different ways of doing this:

Neutralization by means of flocculation: In chemical-physical applications, the wastewater can be neutralized by flocculants such as milk of lime. This is favorable, but has the disadvantage that the water treated in this way has to be freed from lime again. The dosage of antiscalants or complexing agents prevent the formation of lime and gypsum by converting them into more easily soluble substances. However, the wastewater becomes acidic again if excessive amounts of these antiscalants have to be used.

Neutralization by means of continuous neutralization: Another more frequently used method for neutralizing wastewater is through-flow neutralization. Here, the pH value of the wastewater is measured by means of a probe and automatically adjusted with the dosage of acid or alkali. Wastewater that is too acidic is neutralized with sodium or potassium hydroxide, for example. In the case of alkaline wastewater, on the other hand, acid, for example sulfuric acid, is added to the wastewater. The result is a neutral pH.

Areas of application for wastewater neutralization systems in industry

Come into use Wastewater neutralization systems, especially for the often strongly acidic wastewater in electroplating. Salty wastewater, for example from stainless steel pickling, must also be treated. In the pre-treatment of paintwork, the use of neutralization systems is also necessary to adjust the pH value.

H2O: Solutions for neutralization in your company

For the optimalH2O GmbH offers wastewater neutralization a continuous neutralization with a downstream vacuum evaporator. This process is perfectly suited for industrial wastewater from surface technology, such as electroplating, painting pretreatment, pickling processes or hardening shops. The treated wastewater can be discharged or reused in production.

The company has also developed an innovative technology for alkaline and slightly acidic wastewater: the Destcontrol pH controller. This has a decisive advantage: Constantly stable distillate quality in a single step. The Destcontrol technology integrated in the evaporator measures the pH value in the distillate and immediately doses the appropriate amount of acid or alkali into the evaporator sump. It reacts to fluctuations during evaporation and thus prevents a bad value in the final pH check. The result is a consistently stable distillate quality, ideal for discharge or reuse.

Thanks to the Destcontrol pH regulator, the upstream neutralization is superfluous

The advantages of the Destcontrol pH regulator:

- The pass-through neutralization becomes superfluous: The fully automatic Destcontrol pH regulator saves space in production. Because it is integrated directly in the VACUDEST evaporator.
- Constant values ​​for the best distillate: With Destcontrol, fluctuations in the pH value are a thing of the past. This innovative technology regulates the pH value in the purified distillate to the optimum value.
- High process reliability: As the operator, you are responsible for compliance with the limit values. With the Destcontrol pH controller, you can be sure that the treated wastewater reliably complies with the pH limit values.