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| Waste Water Recycling Including Zero Discharge |
Incorporation of Membrane System in Effluent Treatment |
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Tertiary Treatment By RO
Generally primary and secondary effluent treatments are given by industries to meet the statutory requirements set by State & Central Pollution Control Boards for disposal of industrial effluents. The import parameters which are deciding criterion to evaluate the quality of treated effluents are total dissolved solids (TDS), total suspended solids (TSS), pH, Biochemical oxygen demand (BOD), Chemical oxygen demand (COD), Oil & grease, colour, many heavy metals etc.
The major effort in primary and secondary effluent treatment is
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directed towards meeting the above-mentioned parameters. Even though it may be possible to achieve necessary disposable quality by primary and secondary treatments the treated water never becomes reusable and therefore it is discharged into sewer/water bodies such as canal/creek/sea/rivers. It is also difficult to monitor the quality of the effluent discharged by individual units about their consistency in meeting the required parameters. As per the existing law water cess is being levied on all the industries which are disposing treated/untreated effluents out of their factory premises. |
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In order to produce reusable grade water from the primary/secondary treated effluent Reverse Osmosis (as a tertiary treatment) is being used regularly. Incorporation of RO ensures very high quality water which is almost free from colour, BOD, COD, TDS, TSS and other heavy metals etc. This is found to be extremely beneficial as it significantly reduces the water cost of an industry on one hand and achievement of almost zero discharge on the other. |
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