REVOLUTIONARY SOLUTION FOR SEWAGE TREATMENT AND REUSE
A REVOLUTIONARY CONCEPT IN SEWAGE TREATMENT SOLUTION AND REUSE
An ideal sewage and grey water treatment and reuse for
Apartments, office buildings, Info Parks, Hospitals and
Hotels.
Chempure’s Membrane Biological Reactor(MBR) plant is a robust wastewater treatment process with inherent features designed to reduce maintenance and provide reliable and efficient wastewater treatment for small scale applications.
Chempure has a technical tie-up with NORIT- Netherlands for the cross flow membrane technology for domestic and industrial wastewater treatment and reuse application. The product is named Crossmem.
Chempure also tied up with TRISEP- USA for the submerged sidestream membrane biorector technology for domestic wastewater treatment. and reuse The product is named as Submem.
Principle of the membrane bioreactor(MBR) :
| The membrane bioreactor (MBR) combines biological treatment with membrane separation. The treated water is separated from the purifying bacteria (active sludge) by a process of membrane filtration rather than in a settling tank as in conventional systems. Only the treated effluent passes through the membrane. It is then pumped out. The sludge is recovered and dewatered. Improved performance. The biomass contained in an MBR is far more concentrated, varied and lasting than in a conventional system. These properties enhance treatment efficiency. |
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The conventional biological system is sensitive to wastewater composition. Due to variations in wastewater composition and/or the presence of complex or toxic substances, high salt concentrations or low oxygen concentrations, the biomass floc formation is poor and the settling process will not perform well. This results in the discharge of the micro organisms and poor effluent quality. The membranes will, however, withhold all biomass and other suspended solids, ensuring a high effluent quality.
Very compact design :Due to the membrane separation the active micro organism population in the bioreactor can be maintained at a concentration 4-5 times higher than in conventional systems. This results in bioreactor tank volumes of only 20-25% of the size of conventional systems. A clarifier, which is a space-consuming tank, is not required.
High effluent quality :
The ultra filtration membranes withhold all micro organisms and most suspended solids, resulting in a clear and highly purified effluent. The effluent may be reused as low-grade process water or for irrigation purposes.
Low sludge production :
The MBR can operate at a low F/M ratio, i.e. the feed of organic substance per quantity of micro organisms per time unit. This results in a high mineralization of the sludge. In conventional systems 1 kg COD will result in about 0,3 -0,4 kg of biomass. With MBR systems 1 kg COD is converted to 0 - 0.2 kg biomass (zero biomass production can be obtained when operating at high temperatures). The discharge of biomass can have significant impact on the operational costs of the system.
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Submem :
Submem is based on the conventional biological wastewater process, but the separation of micro organisms is performed by submerged membrane filtration. Wastewater is pumped into the bioreactor and oxygen is dissolved into the bioreactor by means of fine bubble aerators located at the bottom of the reactor.
The submerged membranes are located in a separate tank beside the bioreactor where the aerated sewage is pumped to the MBR tank. The permeate pumps draws the filtered water through the modules. It goes into the back flush mode based on a timer sequence. The concentrated biomass in the MBR tank flows back to the aeration tank during back flush and maintains a high MLSS in the aeration tank. Excess sludge is withdrawn periodically.
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Crossmem :
CrossMem is based on the conventional biological wastewater process, but the separation of micro organisms is performed by cross flow filtration.
Wastewater is pumped into the bioreactor. Oxygen is dissolved into the bioreactor by means of fine bubble aerators located at the bottom of the reactor.
The mixture of biomass is continuously circulated through a membrane filtration unit. The filtration unit consists of series of several ultra-filtration membrane modules.
A membrane module contains several hollow membranes which form the filter unit. The biomass mixture is pumped at high velocity through the membrane tube. High velocity is required for the constant cleaning (by turbulence) of the wall of the tube, which is the actual filtering membrane. The membrane is permeable to water and dissolved compounds, but retains the biomass and other suspended matter. The pressure on the feed of the biomass mixture is the driving force for filtration.