As a core monitoring device in wastewater treatment processes, online pH controllers significantly improve treatment efficiency and reduce operating costs through real-time measurement and precise regulation. The technical principle is based on the glass electrode method. When the electrode contacts the solution, hydrogen ions exchange on the surface of the sensitive glass film, forming a potential difference related to the pH value. The controller collects this signal and outputs high-precision measurement values after temperature compensation, filtering and amplification processing.
In the field of electroplating wastewater treatment, a certain East China electroplating park processes 800 tons of alkaline wastewater (pH 10-12) per day. An online pH controller is used in conjunction with a sulfuric acid dosing system to accurately control the pH value within the range of 8.5-9.0 through real-time monitoring. This system improves the efficiency of heavy metal precipitation by 20%, increases the removal rate of nickel ions from 70% to 95%, and stabilizes the total nickel concentration in the effluent below 0.1mg/L, in accordance with the "Emission Standards for Electroplating Pollutants". The operating cost of the project is only 8 yuan/ton, which is 25% lower than traditional processes, and the treated water is partially reused for ground flushing, achieving water resource recycling.
In the treatment of chemical wastewater, a certain chemical plant optimized the neutralization reaction process through an online pH controller, improving the pH control accuracy from ± 0.3 to ± 0.1, increasing the yield of raw materials by 8% and reducing impurity content by 50%. The built-in automatic alarm function of the controller can start the dosing pump in a timely manner when the pH value deviates from the set range, avoiding excessive dosing of drugs and saving more than 30 tons of acid and alkali usage annually.
In the field of municipal sewage treatment, an online pH controller is linked with a PLC system through a 4-20mA signal output to control the opening of the dosing pump in real time, stabilizing the pH value of the effluent within the standard range of 6-9. After the application of a certain sewage treatment plant, the dosage of chemicals decreased by 30%, the remote monitoring coverage rate increased from 30% to 100%, and the fault response time was shortened to 30 minutes, ensuring the compliance of the discharged water quality.