📍 Project Location: Dongguan Electroplating Industrial Park, Guangdong / Jinhua Surface Treatment Zone, Zhejiang
🔩 Application Scenarios: Electroplating workshop collection tank, chemical precipitation reactor, ion exchange/RO pretreatment, final discharge compliance monitoring
📅 Implementation: 2024 – present  |  Equipment: GAIMC GWQ-MP200 Multi-parameter Water Quality Analyzer (supports pH/ORP/Conductivity/Turbidity/COD/Residual Chlorine, digital sensors)

Electroplating wastewater contains complex pollutants: heavy metals (chromium, nickel, copper, zinc), cyanides, COD, acids and alkalis. In conventional treatment, pH control accuracy directly determines heavy metal precipitation efficiency, while ORP regulation affects hexavalent chromium reduction. However, manual sampling lags behind and scattered data often lead to non-compliance risks and chemical waste. The GWQ-MP200 multi-parameter analyzer features a high-reliability RTOS and connects digital sensors for pH/ORP, conductivity, turbidity, COD, residual chlorine, etc. It enables 24/7 online monitoring of equalization tanks, reactors, clarifiers, and final discharge. Data is transmitted via RS485 (Modbus-RTU) and 4-20mA to seamlessly control dosing pumps and mixers, achieving precise control, ensuring stable heavy metal compliance (e.g., total Ni <0.1mg/L, total Cr <0.5mg/L), and reducing chemical consumption by over 20%.

At a centralized WWTP in a large Guangdong electroplating industrial park (3,000 tons/day), two GWQ-MP200 units were deployed to monitor the Comprehensive regulating tank, chromium reduction tank, neutralization/precipitation tank, and final discharge. With pH/ORP PID to dosing pumps, after 6 months: hexavalent chromium reduction efficiency increased to 99.5%, total Cr, Ni, and Cu consistently met the Electroplating Pollutant Discharge Standard (GB 21900); lime/sodium sulfide consumption reduced by over 25%; ORP early warning prevented excessive reducing agent addition and secondary pollution. Clarifier effluent turbidity dropped by 40%, significantly reducing the load on downstream membrane systems.

Based on segregated treatment and final compliance needs, GWQ-MP200 recommended configurations:

• Chromium reduction unit: ORP + pH (2 channels) for precise reduction potential and reaction pH control;
• Heavy metal precipitation unit: pH + Turbidity (2 channels) to ensure settling efficiency and detect solids carryover;
• Cyanide breakpoint & advanced treatment: Residual Chlorine + ORP (2 channels) to ensure complete oxidation without residual chlorine;
• Final discharge compliance: pH + Conductivity + Turbidity + COD (4 channels) for direct integration with environmental data loggers.

When ordering, specify number of channels, parameter type per channel, measurement range, and cable length. Compatible only with digital sensors. Acid/alkali resistant and anti-fouling electrode options available.

“After installing the GWQ-MP200, our reactor pH no longer fluctuates beyond limits. ORP and reducing agent dosing now form a closed-loop automatic control. Operators have reduced manual sampling from every two hours to daily walkthroughs. The data storage feature provided complete compliance evidence during multiple environmental inspections.” — Plant Manager, Dongguan Electroplating Industrial Park WWTP