Periodic Negative Pressure of Well Acidation Method

To against the disadvantages of lower increase of well discharge and serious pollution to groundwater in using the conventional methods of well acid treatment, the authors advanced a method of well acid treatment with periodic negative pressure. The stronger acid liquor in pit shaft are pushed into fissures of carbonatite aquifer and withdrawn the reaction products in the fissures by periodic negative pressure. Therefore the result using this method one time is equal to the conventional method and flushing for many times. Using periodic negative pressure and less amount of acid with multiple injection effectively reduces groundwater pollution. The practice results show that this method can increase 186% of average well discharge and reduce 59% of average drainage of polluted water in comparison with the conventional method. The method can be widely used because of its good results, lower pollution and cost, and convenient to be used.