Using membrane filtration system, pulp and paper
mills can now effectively treat the effluent streams. Using latest
membrane filtration system, effluent streams can be treated without the
fouling problems. The treatment with membrane system effectively reduce
BOD,COD, TDS, TSS and color bodies from effluent streams that is
discharged pulp and paper mills. The liquid fraction is filtered freely
without the building up of solids over membrane, thereby reducing the
fouling possibilities.
Membrane that is popularly used are ultrafiltration or nanofiltration
membrane to treat the effluent. These membrane separate fibers, fines,
fillers and organic materials or dissolved solids and hence generates
stream which meets water discharge or reuse criteria. If there is a
possibility of TDS buildup, reverse osmosis filtration can be used. The
treated wastewater can be discharged or recycled back into the mill for
reuse.
Waster Water Treatment In Pulp Industry
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As per diagram, the membrane in used in secondary and tertiary
stage. The effluent from the primary clarifiers is treated by using
membrane in secondary treatment step whereas the effluent from the
secondary clarifiers is treated again in a tertiary treatment step using
membrane. The water so treated can be either reused or discharged. In
every stage of water treatment biological oxygen demand (BOD) and (COD)
is reduced considerably.
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