Online COD Analyzer

Online chemical oxygen demand (COD) analyzers continuously measure the oxygen equivalent required to oxidize organic compounds in a water or wastewater sample. They provide real-time effluent quality data for industrial discharge compliance and wastewater treatment process control. Furthermore, they eliminate the 2-hour laboratory dichromate digestion procedure that standard batch COD testing requires.

Online COD analyzers use three primary measurement approaches. Wet chemistry analyzers replicate the dichromate oxidation method in a miniaturized flow-through reactor. They digest a continuous sample stream at elevated temperature. The residual oxidant is then measured colorimetrically. These cover COD ranges from 5 mg/L to 15,000 mg/L. Furthermore, UV absorption analyzers measure sample absorbance at 254nm. They correlate UV absorbance to COD concentration through a matrix-specific calibration. These require no reagents and deliver continuous measurement with sub-minute response times. As a result, they suit rapid process feedback at wastewater treatment plant inlets and industrial discharge points.

Electrochemical COD sensors use hydroxyl radical oxidation on a boron-doped diamond electrode. They mineralize organic compounds and generate a proportional current. Moreover, these require no chemical reagents or UV lamp maintenance. Additionally, TOC-based COD estimation systems measure total organic carbon through high-temperature combustion. They apply a COD:TOC ratio factor to deliver a reagent-free COD surrogate for consistent wastewater matrices.

Output interfaces include 4–20mA analog, Modbus RTU, and Profibus. These connect to SCADA systems, PLC dosing controls, and environmental data platforms. Auto-calibration cycles and self-cleaning flow cells minimize maintenance on continuously operating installations.

These analyzers serve Pakistan’s textile plants in Faisalabad and Lahore, tanneries in Sialkot, pharmaceutical wastewater compliance programs in Karachi, sugar mill discharge operations, and Pakistan Environmental Protection Agency monitoring requirements.

Tactical Supply Pakistan supplies online COD analyzers for industrial effluent compliance, wastewater treatment control, and environmental discharge management procurement across Pakistan.