Experimental Study on Electrochemical Technology for Treating Gasification Ash Water

Gasification ash water, due to its high hardness, high suspended solids, and high concentrations of scaling ions such as Ca²⁺ and Mg²⁺, easily leads to scaling issues and reduced heat transfer efficiency. Traditional chemical reagent methods have high reagent costs, secondary pollution, and are unable to completely eliminate scaling. This study, based on electrochemical technology and the actual conditions of gasification ash water from a coal chemical plant in Ningxia, conducted experimental rese arch on the electrochemical treatment of gasification ash water. Through observations during the experimental process and testing and analysis of water quality changes, the feasibility of this technology was verified. From the analysis of water quality ind icators, the composition of cathode adsorption products, and the appearance of the plates, it was found that the hardness indicator of the water quality decreased significantly (hardness reduction over 80%), total dissolved solids decreased by more than 30%, and both chloride ion and silica content decreased by over 80%. The overall improvement in water quality was evident. From the observation of the cathode plate after the experiment, scaling was clearly present, with a total content of CaO and MgO in the adsorption products reaching 78%. The experimental results show that electrochemical technology, through the synergistic effect of special plate materials and electrolysis current, can remove scaling factors such as Ca²⁺ and Mg²⁺ from the water quality so urce, and also significantly reduce and improve the total dissolved solids and silica content in the water. This achieves multi-effect synergistic treatment of gasification ash water. By using physical-chemical actions, it treats, manages, and recycles gasification ash water from its source, providing a new innovative approach for the treatment of gasification ash water.