漓江水质变化对水处理工艺的影响

Li River water quality influence water treatment

漓江作为桂林市的重要水源,近年来其水质变化较大,尤其是水体中的NH_3-N和浊度变化最明显,最高值分别达到0.75 mg/L和2040 NTU,水体富营养化严重,造成藻类大量繁殖,影响净水厂原处理工艺的正常运行。根据其不同时期的水质变化特点,将原来常规水处理工艺中的慢滤池改造为气水反冲洗均质滤池;对于漓江水质的突变情况,采取了加大投氯量,提高滤料过滤效果,改造取水构筑物等措施,使出水水质达到饮用水标准。根据水质变化情况选择合适的水处理工艺。

The water quality of Li River has changed a lot in recent years. Especially the changes of NH3 - N and turbidity are very obvious, at most with 0. 75 mg/L and 2 040 NTU respectively. Over-nutrition becomes serious : algae reproduces so greatly that it affects the process of waterworks. According to the feature of the changes , many methods are taken, such as changing the slow filter which is a kind of conventional process to the homogeneous filter with water and gas flushing back. In order to deal with the present water quality change of Li River, some innovations are made and benefit the water treatment process by increasing the chlorine dosage, improving the filtering material and the technology of the construction and so on. So the quality of outlet falls into the Standard of Drink Water. In short, the process of treatment is based on the changes of water quality.