CASE STUDY
Ozone & COD Colour Removal
Industrial Wastewater
South East Asia WWTP (ozonia® ozoneozonia® Ozone / H2O2AOP Solutions)
Background
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New regulations in Thailand required stringent COD discharge concentrations
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Process goal to remove >60% COD
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Client required additional contaminant removal
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Removal of a specific (hard to remove) compounds the SUEZ solution
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pH regulated ozonia® Ozone / H2O2AOP system
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SUEZ process guarantees ozone production
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98% ozone transfer efficiency
Wastewater Treatment
Flow:
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900 m3 / day
AOP Contact Method:
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Side stream injection
Ozone dose:
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Max 875 ppm (1stand 2ndstage)
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1:1 ratio (Ozone : H2O2)
Completion Date:
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August 2015
Ozonia® AOP System
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Ozone generators: 2 x ozonia® CFV-30 (45 kg/h)
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LOX supply system: filter, LOX tank, vaporizer, gas supply
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Nitrogen supply system: compressor, after cooler, refrigerant dryer, tank, adsorption dryer
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2 x contacting systems (including injection)
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H2O2 dosing system: 1 tank, 2 feeding pumps benefits
Benefits
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Laboratory testing was completed in at the ozonia® ozone innovation centre in Zurich allowed efficient definition of solutions, dosing, and equipment needs
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2 stage AOP process combining O3 then O3 / H2O2 delivers optimum results
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Lower CAPEX
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Intelligent process design allows combination of both reaction pathways in the most cost-effective arrangement to lower operational costs (OPEX)
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Hydroxyl radical reactions were required to break down the remaining refractory (hard to degrade)colour compounds & COD AOPs may serve as a polishing step in future