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Application: Disinfection of tertiary treated effluent for re-use In many new residential developments, it is mandatory to install on-site treatment plants so that solid and aqueous waste is to very high standards. This especially applies to environmentally sensitive areas around the coast. Effluent is treated biologically and then polished with UF and RO membranes. Permeate is disinfected with chlorine dioxide for re-use as irrigation or washing water.
For small flow applications, the low capital and chemical running cost of the CDLa generator was the ideal choice. Dioxide Pacific was engaged to design, build and commission the generator and residual control system. The generator consists of two metering pumps dosing 3% sodium chlorite and 6% hydrochloric acid into a reactor. In the reactor a solution of 0.5% is produced which is safe to pump.
Chlorine dioxide solution is dosed through LDPE tube to the dosing point. Redox (ORP) and amperometric chlorine dioxide sensors are used to monitor residual. Control is from a ProMinent D1C monitor with PID control.
Dioxide Pacific provided the complete plant as a skid mounted assembly as shown.
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