PROREACT N - Neutralization Systems

Alkaline wastewater must be neutralized before it can be fed into an outlet channel or into the treatment system. At the same time, it is necessary to prevent any fouling of the organic waste water, the resulting odour accumulation and the deposit of suspended substances in the reactor.

All aforementioned tasks - neutralization, oxygenation and a good mixing of the reservoir - can be achieved optimally and simultaneously in FRINGS PROREACT N - neutralization systems.

System and Process Description:

PROREACT N - neutralization systems normally consist of a reactor in a tower structure. The relevant size and number of reactors depends essentially on the water quantity, the pH values and the neutralization objective set by the legislator. When selecting the material for the reactors, a huge range of materials, such as stainless steel, steel enamel and even a classic concrete structure, can be used.

The core of the neutralization system is the FRINGS IMMERSIBLE AERATOR, which is installed on the floor of the reactor and connected to the carbon dioxide source and the atmosphere using pipes. The immersible aerator independently aspirates air, mixes this intensively with the wastewater and distributes the wastewater-air mixture evenly and in fine bubbles in the reactor. The ascending air ensures a powerful mixing of the entire reactor volume.

If the pH value exceeds the officially determined threshold, the process is automatically switched over to flue gas aspiration using a pH measuring and regulating device or carbon dioxide is dosed into the air inlet pipe. If the wastewater is sufficiently neutralized, then the process is switched back to air aspiration or the CO2 dosing is interrupted, while the immersible aerator continues to ensure oxygenation and good mixing in the reservoir.

Carbon dioxide, either in its pure form or as a component of flue gas, is a cost-effective and non-corrosive neutralizer. Hyperacidity of the waste water is ruled out by means of the carbon dioxide and makes it superfluous to use of corrosive acids as neutralizers, which leads to an increased pollution due to chlorides.

Only high-quality materials and components are used for the neutralization systems, which guarantee long service lives with low maintenance costs. The entire procedure is largely automated and normally only requires routine maintenance works, e.g. calibration of the probes. 

System advantages:

  • Environmentally-friendly wastewater neutralization with carbon dioxide
  • Loss-free utilisation of the carbon dioxide
  • Prevention of unpleasant odours
  • Prevention of deposits
  • Low investment costs
  • Simple and cost-effective retrofitting into existing reactors