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2016年6月,滨海新区部分地区自来水出现嗅味异常问题,经过对水源水和自来水水质的检测分析,确定了致嗅物质为土臭素,且释放土臭素的藻类为鱼腥藻。试验结果表明,水源水中的土臭素主要存在于鱼腥藻细胞内,但在出厂水中,大部分的土臭素已被释放到水中,且呈溶解态。针对土臭素的应急处理,采用粉末活性炭吸附技术,当取水口距离水厂位置较远时,建议在取水口附近和水厂进水口均投加活性炭;当取水口距离水厂位置较近时,建议在取水口附近或水厂进水口投加活性炭。自6月19日,在事发地区取水口上游投加10 mg/L的粉末活性炭,并在水厂进水口处二次投加5 mg/L的粉末活性炭,6月20日,出厂水基本上无异味,用户投诉减少。
In June 2016, there was an abnormal smell odor in tap water in some areas of Binhai New Area. After testing water quality and tap water quality, it was confirmed that the olfactory substance was geosmin and the algae that released geosmin were Anabaena. The results showed that the geosmin in the source water mainly existed in the Anabaena cells, but in the factory water, most of the geosmin had been released into the water and were dissolved. For the emergency treatment of geosmin, the use of activated carbon powder adsorption technology, when the water intake far away from the location of the water plant, it is recommended near the water intake and the water inlet are dosing activated carbon; when the water intake near the water plant location, It is recommended to add activated carbon near the water intake or at the water inlet of the waterworks. Since June 19, 10 mg / L of powdered activated carbon was added upstream of the water intake in the incident area and 5 mg / L of powdered activated carbon was added twice at the water inlet of the water plant. On June 20, No smell on the user complaints reduced.