Wastewater inflow and outflow takes place in a single reactor tank. Normally the process follows the basic steps of Fill, React, Settle and Decant. The ability to create aerobic and anoxic conditions within a single reactor results in flexible operation, better treatment of waste and optimum effluent quality due to the true batch treatment mode.

GSBR® Features

The patented floating decanter (GSBR® - GRENEX SEQUENCING BATCH REACTOR) ensures consistent effluent water quality. Aeration can be provided by surface aerators, fine or coarse bubble diffusers.


  • Excellent handling capability and reliability
  • Tolerates variable hydraulic loads
  • Tolerates variable organic loads
  • Controls filamentous growth
  • No secondary clarifier is needed reducing foot print
  • All components retrievable and accessible
  • Minimal manpower requirements or supervision
  • Low installation costs
  • Easy maintenance

GSBR® Components

  • Diffusers
  • Mixer
  • Decanter (Treated water discharge device)
  • Excess sludge pump
  • Control Panel

MSBR - Modified Sequencing Batch Reactor

The Modified SBR combines the advantages of sequencing batch reactor technology (SBR) with a traditional flow-through activated sludge process (such as A2O).

MSBR is an economical and effective treatment process to remove biological nitrogen and phosphorus. No additional equipment or controls are required in order to use the system for nitrification, denitrification or phosphorus removal.

MSBR maintains a constant water level in the bioreactor with a continuous inflow of raw water. Depending on the characteristics of the wastewater to be treated MSBR can be designed from a minimum of 3 cells up to 9 cells.

MSBR Features

  • Constant water level
  • Continuous flow
  • Capable of handling high peak hydraulic flows due to storm events
  • Optimized biological nutrient removal

MSBR Advantages

  • No need for separate structures such as a clarifier - means smaller footprint
  • Unique flow through system
  • Low TSS discharge, effective nitrification, denitrification and phosphorus removal
  • Ideal for larger flows > 10,000 m3/day
  • Fully automated control system
  • Many installations in Korea, China, Thailand and South America


BioLens® is the registered name in Korea for the patented porous Lentikats biocatalyst. Made from PVA (Polyvinyl Alcohol), its matrix captures (encapsulates) the micro-organism cells and allows diffusion of media/pollutants toward the entrapped biomaterial where it is metabolised by the cells. The reaction products or treated water are then freely released.

BioLens® enables the immobilization of pure cultures of bacteria in lentil-shaped carriers and uses them as a novel alternative for nitrogen reduction in wastewater treatment.


  • A compact solution for removal of nitrogen pollution from municipal and industrial wastewaters that will allow reuse or meet strict discharge limits,
  • Lentikat’s biocatalyst BioLens® enables the treatment system to operate at faster and more efficient flow rates,
  • Smaller footprint, quick installation and start-up, low power cost, easy operation,
  • Large fluctuations in the wastewater load quickly adapt to the input control of organic carbon,
  • long-term higher process stability and easy control,
  • Effective and reliable results - can achieve up to 95% nitrogen and organic pollution reduction,
  • A high concentration as well as the removal of a low concentration of nitrogen compounds tertiary treatment,
  • Guaranteed lifetime of BioLens® is 10 years


Nitrification is biological process undertaken by ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) that oxidize ammonia to nitrates via nitrites under oxic conditions. We immobilise in BioLens biocatalyst a mixture of nitrification bacteria Nitrosomonas europaea(oxidation of N-NH4+ to N-NO2-) and Nitrobacter winogradskyi + Nitrospira spp. (oxidizing N-NO2- to N-NO3-).


In activated sludge mixed liquor there is only up to 4% of AOB and NOB in the heterotrophic microbial environment.
In activated sludge processes nitrification is quite sensitive to retention time, aeration and sufficient oxygen and the presence of any inhibitors.
In contrast to activated sludge mixed liquors, the nitrification process using BioLens® ensures 100% of effective nitrification bacteria and 16X higher in abundance. Immobilization of cells offers higher stability and control over the biological process of nitrification.


  • Neutralization by caustic soda (30%) feeder
  • Air injection blower
  • BioLens® separator. An accessory that is attached to the nitrification reactor


  • Treatment of reject waters produced in anaerobic stage of municipal WWTP
  • Treatment of reject water after anaerobic digestion in biogas plants

Ammonia polluted water is also produced by:

  • chemical and fertilizer industry
  • electronic engineering industry
  • pharmaceutical industry
  • animal farms


Where to apply

  • Retrofit of insufficient WWTP, (removal of residual ammonia)
  • At any WWTP based on activated sludge with increased ammonia concentrations in effluent
  • At a wetland treatment plant to increase ammonia removal efficiency


6NO3- + 5CH3OH = 3N2 + 5CO2 + 7H2O +6O2-

Denitrification is the conversion of nitrates to nitrogen gas under anoxic conditions. We immobilise pure cultures of heterotrophic strains Paracoccus denitrificans or Pseudomonas fluorescens, etc.

Denitrification is the second of two processes involved in the biological removal of nitrogen - the conversion of nitrates to nitrogen gas. Heterotrophic bacteria use the nitrate as an oxygen source under anoxic conditions to break down organic substances present in wastewaters. They do not require aeration to live. Denitrification requires a carbon source (organic substrate) for the reduction of nitrate to nitrogen gas. The following is one possible denitrification reaction mechanism:


The process of denitrification can be easily controlled using BioLens® in suspension and with appropriate dosing of an organic substrate (eg methanol). Traditional technologies based on activated sludge fail to respond to variations in nitrogen loads resulting in sludge wash-off or process instability.

Using BioLens® maintains treatment capacity, eliminates process uncertainty and requires at least 10% less organic substrate compared to activated sludge process


  • Tertiary treatment - post denitrification
  • BOD removal and selective biodegradations

NIDEAS<sup>®</sup> Process

NIDEAS® Process

Nitrification combined with denitrification based on activated sludge

NIDEAS® bacterial nitrification process has up to 16 times higher occurrence of nitrification bacteria than normal activated sludge. NIDEAS® is new process for removing both organic matter and nitrogen, and at the same time can reduce by up to 50% the size of the nitrification reactor.


  • up to 16 times higher nitrification bacteria than normal activated sludge,
  • up to 50% reduction in the size of nitrification tank,
  • no risk of nitrification bacteria wash out due to fluctuations of flow,
  • energy saving in aeration system,
  • process stability
  • smaller footprint


Anaerobic treatment is a biological process wherein organic wastes are broken down by anaerobic microorganisms in the absence of oxygen. As BOD is removed, biogas, containing energy rich methane is produced. A small amount of stable sludge is also produced which can be beneficial for agricultural purposes. Anaerobic technology is well suited for pre-treated warm and high-strength wastewater.

Anaerobic Hybrid Reactor

The Hybrid reactor is a high-rate system that combines two anaerobic processes - the UASB (up-flow anaerobic sludge blanket) on bottom and UFF (up-flow fixed film) on top - and retains the process advantages of each. It also requires less space than other treatment methods.