Cyanide Wastewater Treatment-Water Quality Analyzer Water Quality Analyzer
Several modern industrial processes generate cyanide-containing wastes, including metal plating, hardfacing of steel, and refining of gold and silver ores. Wastewater from these processes contains even traces of cyanide and must be treated before being discharged into the sewage system. The treatment of cyanide wastewater is critical because cyanide waste is toxic to organisms. Specifically, cyanide may reduce or reduce oxygen utilization in organisms, including humans, making cyanide poisoning potentially fatal. Aquatic organisms, including microorganisms that participate in natural water purification streams, are particularly susceptible to cyanide poisoning. If waste containing cyanide enters agricultural or municipal water systems, the toxicity of cyanide will directly cause personal injury. Alkaline Chlorination System The main method of cyanide wastewater treatment is alkaline chlorination. This processing takes place in two steps. First, cyanide is oxidized to cyanate by sodium hypochlorite. The reaction can be carried out by adding sodium hypochlorite directly or by adding chlorine and sodium hydroxide. In the second step, cyanate is oxidized to carbon dioxide and nitrogen by further addition of selected oxidizing agents. pH and REDOX (ORP) Control in Cyanide Wastewater Treatment Systems To ensure that the alkaline chlorination process proceeds efficiently, it is critical to monitor pH and ORP during each oxidation step. pH Control Controlling the pH is critical during the oxidation of cyanide to cyanate. If the pH is too low (acidic) at this step, the reaction may produce toxic cyanogen chloride. Improper pH control can also lead to inefficient reactions: a suboptimal pH can negatively affect reaction speed and rapidly add more oxidizing reactants than stoichiometric requirements. ORP Control ORP is monitored at each oxidation step to track the progress of the reaction and ensure oxidation is complete before waste is discharged. As each oxidation reaction proceeds, the ORP increases and eventually levels off. The exact ORP values at which each plateau occurs depend on the specific reaction conditions of individual cyanide waste treatment schemes. The following table lists typical pH and ORP ranges: Cyanide Oxidation to Cyanate A typical cyanide wastewater treatment monitoring system will consist of two pH sensors, two ORP sensors and four controllers. A sensor with a well-protected reference junction is ideal for cyanide waste treatment applications, as preventing reference poisoning will extend the sensor's useful life. Gold-charged ORP sensors (as opposed to the usual platinum) are also recommended as they provide accurate measurements for efficient reagent control. 3S Colorimetric Cyanide Online Analyzer Cyanide Online Analyzer is an online continuous analysis instrument that uses LED light source for colorimetric analysis and measurement of cyanide concentration. The typical analysis procedure of the analyzer is set inside the system, such as: flush the optical reaction cell with the sample, extract a part of the sample at the same time, add one or more reagents, such as buffer or masking agent, and then perform a second measurement as a reference measurement value. Reference measurements can be disturbed by factors such as sample color and turbidity, as well as various colors from pharmaceuticals and refracted light. After obtaining the reference value, the color changes after adding potions. The sample is mixed and allowed time for the color to fully stabilize, and a second measurement is taken to obtain a second reading. The reference measurement value and the second measurement value are used to calculate the concentration value under certain process coefficients. The reaction cell is then emptied and rinsed several times before the next cycle of measurement is performed. Application field of cyanide online analyzer The application field of 3S online cyanide analysis instrument is relatively wide, and many environmental protection enterprises are involved. For example, many domestic wastewater treatment plants and industrial applications are aimed at underground surface water monitoring, ultra-pure water detection, and online detection of steam and condensed water. Osmotic plants, ion exchange systems, process optimization of boiler feed water wastewater treatment plants, monitoring of sewage treatment plant outlet system detection, surface water analysis and treatment, etc. 3S cyanide online analysis instruments can meet the detection data of the above enterprises.