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Cuss - Chriwa Umwelt-Systemtechnik und Service GmbH - Technology

Mechanical and chemical pre-treatment

  • Mixing and equalising systems
  • Setting of pH value and nutrition ratio
  • Solids and sand removal; oil separator
  • Flotation and other technologies

Anaerobic treatment

  • Methane reactor with lamella separator
  • UASB reactor
  • EGSB reactor

Energy-efficient by biogas production

The anaerobic wastewater treatment has reached increasing importance in recent years. Again, CUSS has successfully implemented various projects and gained a high reputation in the market through well-engineered concepts and customer-dedicated project execution. Especially in industries with highly contaminated wastewater, anaerobic treatment is an excellent solution with individual benefits. Biogas from the anaerobic digestion of organic matter represents a considerable energy potential for electricity and heat generation. For environmental protection and resource conservation, the use of this potential is of considerable importance.

The emission of biogas (methane) into the atmosphere is prevented, so that the environment is protected. Through the use of biogas to replace fossil fuels, the operating costs are significantly reduced. The CO2 emission is reduced.The use of combined heat and power (CHP) in conjunction with water treatment plants is an integral part of our product range and will gain further importance in the future.

Aerobic treatment

  • Cycle aeration plants with round or rectangular clarifier
  • SBR system
  • MBR system (with special technology for saving cleaning chemicals)
  • Sprinkling filter

Treatment by biological processes

The aerobic wastewater treatment is the most widely used and proven technology. A decomposition/conversion of the organic and chemical pollutants ( BOD , COD, nitrogen N and phosphate as P by aerobic biological processes, i.e. by various microorganisms (mainly bacteria) that require elementary oxygen to live as oxidative metabolism. The phosphate reduction is carried out by sedimentation.

The reduction of BOD and COD and the conversion to activated sludge is possible up to 95-98%, the reduction of N and P up to 50 %. As outlet value for BOD <50 mg/l is reached.By the activated sludge in the presence of oxygen , the conversion of non- suspended solids in colloidal or dissolved form to biological flocs which are removed by sedimentation and sludge from the system is accomplished. This results in a substantial secondary clarification of the wastewater. In blending the incoming wastewater with return activated sludge, a fast reduction of the organic pollutants is achieved.The excess sludge formed in the process will be treated and disposed of by means of sludge thickeners and dewatering chamber- or belt filter presses . The excess sludge can possibly be sold as fertilizer or seed sludge for other plants.The proven CUSS aerobic technology includes, for example:
Inlet screening grit, sand- oil- and grease trap, intake pumping station, static or rotary drum screens, screenings compaction, biological mixing and equalization tanks (BENB), pH adjustment/neutralization, lamella separators, emergency storage tanks, biological treatment by so-called SBRs ( sequential batch reactors ), aeration tanks, sludge sedimentation and extraction. Water aeration is accomplished by submerged or special membrane aerators, driven by side channel blowers, monitoring and control instrumentation, sludge thickeners, sludge dewatering.The customer benefits are:
Small necessary reactor volume, high process reliability, easy maintenance and process technology, low investment and operating costs , precise controllability of the cleaning process. If necessary, a variable process flow is possible. By sufficiently sized and carefully operated mechanical-biological wastewater treatment plants the wastewater can be cleaned to the extent that fish can live in the fish pond or effluent and control aquarium.

Cleaning and Reuse

  • Gravel and activated carbon filtration
  • Membrane technologies (e.g., ultrafiltration, reverse osmosis)
  • Disinfection (e.g. UV lamps, ozone, chlorination)

Sludge treatment

  • Sludge dewatering (e.g. by screen filter press, centrifuge, chamber filter press)
  • Sludge thickening/storage

Biogas treatment and use

  • Biogas cleaning as per requirements
  • Emergency flares
  • Reuse in a boiler
  • Reuse in cogeneration

Waste air treatment

  • Biological systems (e.g. in in the aeration tanks)
  • Activated carbon filtration

Waste to Energy


  • Wastewater as a source for renewable energies
  • Anaerobic treatment of wastewater makes it an efficient source for power generation
  • Can be used for industries and production plants
  • Significant reduction of environmental pollution
  • Excess power can be used for energy supply

Concept: Biogas plants

  • Fish tins
  • Bagasse
  • Leftovers from seeds and fruit
  • Leftovers from abattoirs
  • Leftovers from beer and rum production
  • Leftovers from food production

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