GSBR® - GRENEX SEQUENCING BATCH REACTOR
(GSBR® - GRENEX SEQUENCING BATCH REACTOR)
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.
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.
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.
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.
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.
Ammonia polluted water is also produced by:
TERTIARY TREATMENT - POSTNITRIFICATION
Where to apply
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
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.
ANAEROBIC TREATMENT SYSTEM
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.