Activation of biological wastewater treatment
|
The acid capacity plays a decisive role in biological wastewater treatment. A minimum acid capacity of 1.5 mmol/l, or better 2 mmol/l, in the effluent of the biological treatment plant is recommended, since the biological processes are otherwise severely disrupted by excessively low pH values (< 7.0).
According to the equation: CaCO3 + CO2 + H2O ? Ca(HC3)2 an acid capacity of 2 mmol/l can be produced by adding 1 mmol/l chalk (100 g/m3).
Compared to other chemicals, the natural product chalk has the following advantages:
- Cost-efficiency
- High reactivity and rapid dissolution
- Simple handling
- No risk of exceeding pH values
- No encrustation in pipelines
- No sedimentation
In addition to stabilising the pH value, chalk has positive effects on the entire wastewater treatment process, such as:
- Sludge weighting
- Improved dewatering properties
- Support of biological P elimination
- Buffer system
The Optical 20 grade is a suitable type from our product range.
Optical – fine chalk from the Plant Söhlde
|
|
