Emergency handling method for paroxysmal representative heavy metal pollution of water source of city

Abstract

Disclosed is an emergency treatment method of sudden typical heavy metal pollution of city water-supply source, comprising: measuring the content of heavy metal in raw water, putting a coagulant into the raw water when the concentration exceeds a certain numerical value; controlling the filtering velocity at a proper numerical value and setting down a drainage closing time point of initial filter water; and back flushing in a filter chamber. The method aims at three typical heavy metal pollutants of arsenic (As), plumbum (Pb) and cadmium (Cd) and is an emergency treatment technique developed on the basis of the general water treatment process (namely, coagulation, precipitation, filtration and sterilization) flow, and has rather broad applicable range and strong utility value; and secondly, the method can maximally reduce the time of water supply stopping; and has strong reliability, and can well control the three typical heavy metal pollutants of arsenic (As), plumbum (Pb) and cadmium (Cd), and can also properly control other water quality indexes such as turbidity degree, COD(Mn), disinfection by-products, total manganese, total iron, total aluminum and pH value.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a water purification technology emergency treatment technology proposed for sudden heavy metal pollution of urban water supply sources and applicable to water purification plants. Background technique [0002] In recent years, there have been many major heavy metal sudden pollution incidents in many rivers and basins in my country, which directly endanger the drinking water sources of cities and cause many social problems that residents have no water to drink. For example, on December 15, 2005, the Guangdong Beijiang cadmium pollution incident caused pollution of drinking water sources in Guangzhou, Foshan, Qingyuan and other places. In January 2006, the cadmium pollution incident in the Xiangjiang River in Hunan caused difficulty in drinking water in Xiangtan, Changsha, Zhuzhou and other places. On September 8, 2006, a sudden incident of arsenic pollution in drinking water occurred...

AI Technical Summary

Problems solved by technology

At present, domestic and foreign studies on sudden pollution of drinking water sources are mainly focused on early warning and assessment, and emergency plans for water supply cities are mostly focused on considering the optimal dispatch of multiple water sources and multiple pumping stations to avoid the impact of pollution. Polluted water sources or reducing the water supply of polluted water sources, etc. are more passive ways to deal with; from the perspective of water purification technology, establish a complete emergency strengthening technology of water treatment process to ensure uninterrupted water supply and water supply quality in emergency situations Studies are rare, especially on heavy metal pollution

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