Jami, Mohammed Saedi and Ohn, Than and Iritani, Eiji
(2010)
Efficient method for the purification of coagulated sewage secondary effluent.
In: IIUM Research, Innovation & Invention Exhibition (IRIIE 2010), 26 - 27 January 2010, Kuala Lumpur.
Abstract
Constant rate microfiltration experiments are conducted in purification of sewage secondary effluent
pretreated with polyaluminum chloride (PAC). Monolithic ceramic membrane having a nominal pore
size of 1.0 micro meter with 19 tubular channels is used as a filter medium. The system is capable of
selecting the required mode of membrane cleaning, i.e., physical backwashing or chemically enhanced
backwashing, based on the set value of the operating parameters. Flow resistance resulted from the
formation of the filter cake is reduced by the physical backwashing, but in spite of this, the flow
resistance increases gradually in a longer period of operation due to irreversible pore blocking. Hence
chemically enhanced backwashing should be conducted occasionally. Sodium hypochlorite is used as
cleaning agent and it is injected automatically when pore blocking reached to the preset level. The
experimental results showed that the chemically enhanced backwashing is effective in restoring the
increased portion of the flow resistance. The fully automatic system was found to be stable regardless of
the variable influent quality and could be run at relatively higher flux of 3.0 m/d for a long period of time.
The filtrate is free from pathogens and can be reused as reclaimed water for toilet flushing, car washing,
etc. Furthermore, the results obtained under various operating conditions indicated that when process
optimization is considered, there should be a trade off between the energy consumption and the amount of
cleaning agent used per net filtrate volume.
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