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An Introduction to Biological Treatment and Membrane Filtration 397

9.13 SUMMARY

The pilot plant study shows that proper sludge acclimation makes it possible
to treat difficult wastewater (BOD/COD <0.4). The study conducted with
innovative MBR membrane modules shows that the operating flat mem-
brane in side stream mode is effective and very efficient. It can handle
municipal as well as various industrial wastewaters successfully. Pilot scale
module operations with wastewater verified the design and also confirmed
the flexibility of the biological sludge handling capacity. In the present case
study, the objectives of achieving permeate quality were fulfilled by a
two-stage sequential bioreactor process, which was used for removal of car-
bon and reduction of TKN. The biological parameters such as MLSS and
SRT were readjusted from the conventional activated sludge, which
resulted in achieving COD reduction (>90% COD), along with reduction
of BOD and TKN. The Aqua EMBR pressurized membrane module shows
consistent solids rejection with turbidity very suitable for reverse osmosis
application. The product generated from the wastewater treatment facility
is being reused successfully in the process after treatment with reverse osmo-
sis in addition to satisfying other non-potable water needs in the plant.

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