To eliminate the potential leakage hazards during transportation and storage arising from the importation of liquid chlorine, and secure a reliable supply of chlorine gas and sodium hypochlorite solution for the fresh water treatment, the WSD has launched a major construction project since 2016 to install onsite chlorine gas generation facilities at 12 major WTWs to produce chlorine gas on demand for drinking water disinfection. In January 2023, the upgrading of disinfection facilities from liquid chlorine to onsite chlorine gas generation at these WTWs was completed and the onsite chlorine gas generation facilities were put into operation in full swing. Pivoting innovation and technological advancement, the WSD has extensively applied the technology of generating chlorine gas on-site in disinfecting drinking water, the scale of which is the first of its kind in the world. By adopting the advanced ozone water treatment technology, the chlorine consumption in WTWs could be reduced by 30%. The chlorine gas generated can also be used immediately without the need for storage. The installation of onsite chlorine generation facilities at major WTWs signifies a major milestone in drinking water disinfection in Hong Kong. Aside from entirely reducing the potential hazards of chlorine leakage to nearby communities and mitigating the impact on the environment, the onsite chlorine gas generation facilities also help in enhancing the quality, safety and reliable supply of drinking water. 為消除進口液態氯時在運輸和貯存過程中的洩漏風險，及確保 用於食水處理的氯氣和次氯酸鈉溶液有穩定的供應，水務署自 二零一六年起已展開一項大型建設項目，為十二間主要濾水廠 安裝現場氯氣生產設備，供消毒食水使用。二零二三年一月， 這些濾水廠的消毒設備已完成升級，由使用液態氯轉為現場生 產氯氣，並已全面投入使用。 水務署重視創新和科技進步，大規模使用現場生產氯氣技術作 食水消毒為全球首例。透過採用先進的臭氧水處理技術，濾水 廠的氯消耗量減少了30%。現場生產的氯氣可立即使用，無需 貯存。 在主要濾水廠安裝現場氯氣生產設施無疑是香港食水消毒領域 的一大里程碑。這除了降低氯氣洩漏對附近社區的潛在危害及 對環境的影響外，亦有助改善食水質素、安全性及可靠供應。 在主要濾水廠現場生產氯氣取代使用從廣東省進口液態氯為食水消毒，藉此消 除與液態氯運輸和貯存相關的氯氣洩漏的風險，提升食水消毒作業的安全。 The liquid chlorine imported from the Guangdong Province being used for disinfection will be replaced by the chlorine gas generated at the major WTWs, therefore eliminating the risks of chlorine leakage during the transportation and storage of liquid chlorine and enhancing the safety of the disinfection operation. 水務署 二零二二至二三年年報 WSD Annual Report 2022/23 74 Scale up 升 級 開 拓
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