DefinePK

Abstract

Abstract: The treatment of acidic and lead contaminated waste water from an automotive battery production plant was carried out. 1N NaOH, NaOH 98 %, Ca(OH)2 and Na2CO3 were used as four different neutralizers to neutralize the waste water from the positive plate and negative plate washing having pH 1 and 2  in each case. Experiments were carried out to investigate the effect of temperature from 20 OC to 80 OC on the amount of each neutralizer required to bring the pH of the treated water to 7. For waste water of pH 1 from the positive plate, It was found that three neutralizers i.e. NaOH 98 %, Ca(OH)2 and Na2CO3 have shown reduction in the amount as the temperature was increased in the mentioned range. The amount of 1N NaOH, however remains unchanged in response to the increase in temperature. For the negative plate wash water of pH 1, positive plate wash water of pH 2 and negative plate wash water of pH 2, the dose of  1 N NaOH and NaOH 98 %  remains unchanged while a decline in the dose of  Ca(OH)2 and Na2CO3 was observed as the temperature was increased from 20 OC to 80 OC. The treatment of lead contaminated waste water has shown reduction in the amount of lead after passing through marble waste from a minimum of 32 % in the case of negative plate wash water having pH 2 to a maximum of 47 % in the case of positive plate wash water having pH 1. Overall an average of 40 % reduction in the level of lead was achieved by employing marble waste . Lead is removed from the waste water by adsorption on the marble waste.