Which chlorination method is described as having little value in sewage works practice?

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Disinfection in wastewater plants needs a method that is reliable, easy to control, and tolerant of highly variable flow and water quality. An electrolytic cell chlorinator makes hypochlorite by electrolyzing a salt solution, which requires clean operation, a steady brine supply, and ongoing maintenance. In sewage streams, the presence of solids, organics, sulfides, and ammonia tends to foul electrodes and cause scaling or corrosion, making chlorine production unstable and prompting more downtime and higher costs. Gas chlorination and sodium hypochlorite dosing are simpler, more robust, and easier to adjust to maintain the desired residual, which is why the electrolytic cell approach is considered of little value for sewage works practice.