Chemical Engineering September 2020 - 40

Equalization
Coagulation and
flocculation
DNF
Sludge
Recirculation
Oil-sludge
treatment
Bio-sludge
treatment
FIGURE 3. This illustration shows the overall wastewater-treatment scheme used for the Lake Charles
chemicals complex
concentrations should not exceed
5 mg/l. For this reason, special attention
should be given to the pretreatment
selection. this reasoning
was the basis for choosing dnF
technology - a highly efficient pretreatment
step commonly used in
the hydrocarbon and chemical process
industries (cpi) to remove suspended
solids, grease and insoluble
oil from wastewater prior to a biological
treatment process. composed of
flotation units that use nitrogen gas,
dnF treatment typically includes
the following:
* online coagulation for colloidal
material
* a tank is provided for solids settling
(floc formation) and oil coalescence
to help form pin floc compatible
with the flotation process
* a flotation tank equipped with
a centrally driven surface-scraper
mechanism
* a pressurization system for nitrogen
dissolution under pressure and
formation of micro-bubbles required
by the flotation process
* dnF sludge tanks for sludge
storage
Following the dnF, the mBr was
the adopted solution for addressing
the type of wastewaters produced at
MBR
Direct discharge
the lake charles complex. this solution
was especially well-suited for
meeting sasol's needs due to its capacity
for robust removal of chemical
oxygen demand (cod) and biological
oxygen demand (Bod). at the core of
the mBr system is the uF hollow-fiber
membrane, which offers an absolute
barrier to suspended solids, producing
consistent high-quality effluent.
mBr technology integrates membrane
solids separation with a suspended-growth
biological
process
in
a bioreactor. the membranes
are immersed directly in the mixedliquor
suspended solids with permeate
drawn into the fibers by a gentle
suction mechanism. contaminants
in the wastewater are rejected by
the membrane and retained in the
process tank, providing solids-free
treated water. the solids matrix on
the membrane surface is non-porefouling
and easily rejected. additionally,
the system can operate at low
pressures with resulting low power
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40
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ChemiCal engineering www.Chemengonline.Com September 2020

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Chemical Engineering September 2020

Table of Contents for the Digital Edition of Chemical Engineering September 2020

Contents
Chemical Engineering September 2020 - Cover1
Chemical Engineering September 2020 - Cover2
Chemical Engineering September 2020 - Contents
Chemical Engineering September 2020 - 2
Chemical Engineering September 2020 - 3
Chemical Engineering September 2020 - 4
Chemical Engineering September 2020 - 5
Chemical Engineering September 2020 - 6
Chemical Engineering September 2020 - 7
Chemical Engineering September 2020 - 8
Chemical Engineering September 2020 - 9
Chemical Engineering September 2020 - 10
Chemical Engineering September 2020 - 11
Chemical Engineering September 2020 - 12
Chemical Engineering September 2020 - 13
Chemical Engineering September 2020 - 14
Chemical Engineering September 2020 - 15
Chemical Engineering September 2020 - 16
Chemical Engineering September 2020 - 17
Chemical Engineering September 2020 - 18
Chemical Engineering September 2020 - 19
Chemical Engineering September 2020 - 20
Chemical Engineering September 2020 - 21
Chemical Engineering September 2020 - 22
Chemical Engineering September 2020 - 23
Chemical Engineering September 2020 - 24
Chemical Engineering September 2020 - 25
Chemical Engineering September 2020 - 26
Chemical Engineering September 2020 - 27
Chemical Engineering September 2020 - 28
Chemical Engineering September 2020 - 29
Chemical Engineering September 2020 - 30
Chemical Engineering September 2020 - 31
Chemical Engineering September 2020 - 32
Chemical Engineering September 2020 - 33
Chemical Engineering September 2020 - 34
Chemical Engineering September 2020 - 35
Chemical Engineering September 2020 - 36
Chemical Engineering September 2020 - 37
Chemical Engineering September 2020 - 38
Chemical Engineering September 2020 - 39
Chemical Engineering September 2020 - 40
Chemical Engineering September 2020 - 41
Chemical Engineering September 2020 - 42
Chemical Engineering September 2020 - 43
Chemical Engineering September 2020 - 44
Chemical Engineering September 2020 - 45
Chemical Engineering September 2020 - 46
Chemical Engineering September 2020 - 47
Chemical Engineering September 2020 - 48
Chemical Engineering September 2020 - 49
Chemical Engineering September 2020 - 50
Chemical Engineering September 2020 - 51
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Chemical Engineering September 2020 - 53
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Chemical Engineering September 2020 - 56
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Chemical Engineering September 2020 - 58
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Chemical Engineering September 2020 - 60
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Chemical Engineering September 2020 - 72
Chemical Engineering September 2020 - Cover3
Chemical Engineering September 2020 - Cover4
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