Application Examinations / Technology

FRINGS IMMERSIBLE AERATORS and PROREACT T - environmental systems have been used in various sectors of industrial sewage treatment for many years, such as dairies, breweries, tanneries, slaughter houses, food and beverage industry and the starch and textile industry.

FRINGS IMMERSIBLE AERATORS, both the self-aspirating TA and TAK designs and the TRG design, which was designed for primary pressure operation, are used in the sectors of a sewage treatment works, where atmospheric oxygen must be introduced for aerobic wastewater treatment, such as mixing and equalization basins, aeration basins, single-basin- and SBR-plants. FRINGS IMMERSIBLE AERATORS facilitate air introduction with fine air bubbles and permanent circulation of this mixture, thus combining the tasks of aeration, oxygenation and mixing into one function. High levels of oxygenation and oxygen transfer efficiency, easy installation and maintenance, low susceptibility to blockages, and absolute resistance to winter characterise these units.

PROREACT T - environmental systems are used to standardise the flow of sewage, waste water purification and the further treatment of any excess sludge arising during the biological waste water purification.

  • In MIXING- and EQUALIZATION BASINS, the waste water peaks, contamination levels and pH value are standardised. The aeration using the IMMERSIBLE AERATOR prevents the sewage from going bad and unpleasant odours from developing. At the same time, deposits in the reactors are prevented. As a side effect, the oxygenisation can produce a partial biological decomposition of waste water contamination. This relieves the downstream communal purification plant and tends to lead to the discontinuation of the heavy pollution charge during waste water discharge. These systems are used with particular frequency in breweries, malt houses, the beverage industry and dairies.

  • In SINGLE-BASIN- and SBR-PLANTS, biological cleaning of the waste water is carried out using micro-organisms, as is the case in conventional aeration plants. The procedure corresponds, in principle, to a cascading aeration basin with the special feature that the individual process phases (nitrification, denitrification, biological phosphorous elimination and sedimentation) drain into just one reactor controlled by a timer. In single-basin- and SBR-plants, depending on the required cleaning objective, degradation performances can be achieved up to a direct discharger quality.

  • HIGH-PERFORMANCE REACTORS are only used for the biological preliminary cleaning of waste waters with very high contamination levels (e.g. yeast factories, distilleries, pharmaceutical operations). High-performance reactors are closed and work with a constant water level. Due to the large reactor height of more than 10m and the very high oxygen demand, only the TRG-aerator, which is operated using primary pressure, is used. Through aeration with a high introduction of air, foam can be formed, which can be safely controlled by using our FOAMEX foam centrifuges. High-performance reactors represent an alternative to anaerobic reactors, in which biogas arises. The process heat arising through the biological decomposition can be discharged using appropriate installation and used for heating purposes or energy production.

  • In SLUDGE STABILISATION SYSTEMS, the sludge from the sewage treatment systems is aerobically treated until all organic components are oxidised and deposition is possible without any odour issues. This procedure proves itself to be economical for sludge digestion, which works anaerobically, i.e. using air exclusion, as the treatment time can be considerably shortened by the self-heating of the sludge. The process of aerobic sludge stabilisation requires intensive ventilation and mixing. These tasks are combined into one function by the FRINGS Immersible Aerator.

PROREACT N - NEUTRALIZATION SYSTEMS are designed for the neutralization of alkaline wastewater, e.g. for dairy factories. In PROREACT N - neutralization systems, in the place of cost-intensive and highly-aggressive chemicals, carbon dioxide - either in its pure form or as a component of flue gas - is used as a cost-effective and non-corrosive neutraliser. A particular advantage of this technology is that overacidification of the waste water can be ruled out by the carbon dioxide. The gas is introduced into the system using regenerative a FRINGS IMMERSIBLE AERATOR. The use of hydrochloric acid as a neutraliser, which leads to an increased pollution due to chlorides, is only required for peak loads (pH >>12).