Conventional Waste Sources:
• Unused Rework powder
• Caustic/Acid waste from CIP
• High strength wastewater BOD/COD/Nutrients rich
wastewater from raw materials
• Oil and grease
• Cleaning agents (sterbac, divosan, divoquat, etc.)
Piping & Instrumentation Diagram
Chiller Heat Exchanger
Domestic and plant wastewater enters the rotating drum
screen which filters any incoming trash or serve as grit
removal. Drum screened wastewater enters the influent
pump station which contains pumps to transfers the
wastewater to the equalization tank.
Wastewater is neutralized and equalized in the equalization tank.
Sulfuric acid and caustic soda are used to neutralize the pH. Antifoam
is also used.
Recirculation pumps together with the equalization blowers are used to
efficiently mix and aerate the contents of the equalization tank and keep
it aerobic. Anaerobic would produce H2S and gaseous ammonia.
Coagulation/Flocculation/ Dissolve Air
Chemical treatment via coagulation and
flocculation combined with
dissolved air flotation reduces the
COD of the wastewater by roughly 30 to 40%. The DAF
float/sludge is transferred to the DAF sludge tank which is
further transported via the DAF sludge/solids pumps to the
sludge holding tank. Treated DAF effluent is fed to aeration
tanks. The DAF serves as a pre-treatment to the MBR.
Chemicals needed: Pacl, polymer
Air is the driving force
Dissolve Air Floatation
After injecting air
Biological treatment is employed to further treat the
wastewater using microorganisms. Chemicals needed
include: phosphoric acid, antifoam, caustic
The MBR system comes with a cooling package. The chillers together
with the heat exchanger regulate the temperature of the bioreactor
mixed liquor before feeding to the membrane tanks. Needs antifoam.
Hollow fiber membranes which filter the wastewater coming from
During permeation During backwash
Sludge Holding Tank
The sludge holding receives sludge from WAS (waste
activated sludge) from the MBR and sludge from the DAF
(dissolved air flotation) floatation and feeds to the
decanting centrifuge. SHT needs polymer and antifoam.
The centrifuge dewaters DAF float and waste activated
sludge from the MBR. It uses centrifugal force to separate
the solids efficiently. Needs polymer.
Issues with Conventional
Activated Sludge WWTP
• Ineffective in degrading sucralose, research by Cesar Torres and Rosa
Krajmalnik-Brown at the Arizona State University’s Biodesign Institute
• Micro plastics from portions of polyester, acrylic and other Synthetic
polymers had contaminated 18 shores across six continents, research
by Mark Anthony Browne of the University College Dublin Ireland,
School of Biology and Environmental Science
• In 2010, the government of Canada proposed for new stricter rules to
regulate the effluents of wastewater treatment plants
Deleterious Substance National standard
Ave carbonaceous BOD ≤ 25 mg/L*
Ave total residual chlorine concentration ≤ 0.02 mg/L*
Maximum conc. of un-ionized NH3 < 1.25 mg/L#
Ave concentration of suspended solids ≤ 25 mg/L*