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在单用石灰石接触池的条件下,滤速≤4 m/h时,其出水的饱和指数IL、稳定指数IR、碳酸钙沉淀势CCPP和侵蚀指数AI都在可接受的范围之内,但是出水的拉森比率LR依然大于0.5.采用CO2与石灰石接触池联用工艺,若出水不进行CO2的脱除处理,其pH值较低,导致出水的IL、IR、CCPP和AI都不在可接受的范围内,出水呈腐蚀性.但是由于出水碱度的升高,LR可降至0.5以下.对出水中残留的CO2进行脱除,提高出水的pH值,使其达到8.0左右,结果表明:IL、IR、CCPP、AI和LR都达到可以接受的范围,从而达到水质化学稳定.
In the case of single limestone contact tank, the saturation index IL, stability index IR, calcium carbonate precipitation potential CCPP and erosion index AI of the effluent were within the acceptable range when the filtration rate was ≤ 4 m / h, but the effluent Of the Larsen ratio LR is still greater than 0.5 using CO2 and limestone contact pool combination process, if the water without CO2 removal, the lower the pH, resulting in effluent IL, IR, CCPP and AI are not acceptable Within the range, the effluent is corrosive, but due to the increase of effluent alkalinity, the LR can be reduced to less than 0.5.The residual CO2 in the effluent is removed and the effluent pH is increased to about 8.0, the result shows that IL , IR, CCPP, AI and LR are all within acceptable limits to achieve chemical stability of water quality.