Chemical-Dosing-System

Chemical Dosing Systems
Series CDS

  • Fully adjustable output capacity fof up to 12 L/hr
  • Manual function control for stroke rate & length
  • Thermally protected solenoid with auto-reset
  • Bleed valve assembly
  • Include PVC head/fittings and PE tank
  • Highly reliable timing circuit
  • Corrosion resistance
  • Factory tested to insure quality
  • 1 Year warranty

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Chemical Dosing SystemCDS System components

  • Diaphragm pump
  • PE Tank
  • Chemical of choices

Diaphragm Pump LMIDiaphragm pump components

  • Pump Head: PVC
  • Diaphragm: Teflon-faced
  • O-Rings: Polyprel
  • Balls: Ceramic
  • Fittings: PVC
  • Tubing: Clear PVC / White PE
  • Tank / Cover: Polyethylene

chemical Dosing LMI PumpCustom requirement

  • Specific capacity
  • Specfic dosing pump (Brand, model, quantity)
  • Speciftc tank (size, material, quantity)
  • Specific chemicals
  • Specific dosing system configuration
  • Specific control system

Membrane fouling and chemicals required

   There are four types of fouling common to UF and RO membrane operations including particulate, biological, inorganic, and organic.

   Particulate fouling is caused by suspended solids, colloids, and turbidity that can be reduced by coagulation, sedimentation, clarification, and media filtration. The common cleaning method for particulate fouling is air scour and backwash.

   Biological fouling is caused by the growth of microorganisms that can be reduced by using in-line chemical feed of chlorine or biocide or by elimination of nutrients by using PAC, GAC, or coagulation. The common cleaning method for removal of biological fouling is Chemically Enhanced Backwash (CEB) with oxidizers or biocides (Cl2, H2O2, SBS).

   Inorganic fouling is caused by the precipitation of inorganics on the membrane that can be reduced by using oxidation/precipitation and filtration as pretreatment to the UF or in some cases using low hardness water for the alkali chemically enhanced backwash. The common cleaning method for removal of inorganic fouling is chemically enhanced backwash with acid at pH 2 (HCl, H2SO4, Citric, Oxalic Acid).

   Organic fouling is caused by organics adsorbing on the membrane (silt, organic acids, humus) that can be reduced by using PAC, GAC, or coagulation. The common cleaning method for removal of organic fouling is CEB with alkali at pH 12 (NaOH).

 

Ordering information
Part number

Chemicals

Cap.
(L/hr)
Pressure
(Bar)
Thank size
(Liter)
AF-CDS-01 Cl2 12 1.5 200
AF-CDS-02 0.2% NaOCI 12 1.5 200
AF-CDS-03 2% C6H8O7 12 1.5 200
AF-CDS-04 0.1% NaOH 12 1.5 200
CL2 = Chlorine, NaOCl = Sodium hypochlorite, C6H8O7 = Citric acid, NaOH = Sodium Hydroxide