METHOD FOR WASTEWATER TREATMENT FOR WASTEWATER CONTAINING ALUMINIUM, MAGNESIUM, AND MANGANESE

摘要

The present invention provides the drainage processing method that manganese is selectively removed from the sulfuric acid draining containing aluminium, magnesium and manganese. By adding acid or alkali in draining to sulfuric acid, the pH of draining is adjusted to 4.0 or more 6.0 hereinafter, the process for being separated into liquid and aluminum precipitation object after dealuminzation; Paste materialization solution is added into aluminum precipitation object, forms paste, then adds alkali, pH adjustment is carried out, so that the pH is adjusted to 9.0 or more 9.5 hereinafter, the process for forming aluminum precipitation object paste after pH adjustment; Liquid adds alkali after to dealuminzation, pH adjustment is carried out, so that pH is adjusted to 8.0 or more 9.0 hereinafter, then, addition oxidant carries out oxidation neutralization, the process for forming paste after oxidation neutralizes; And the process that paste is separated by solid-liquid separation after aluminum precipitation object paste and oxidation are neutralized. By above-mentioned operation, inhibits the precipitating of manganese from the sulfuric acid draining containing aluminium, magnesium and manganese, obtain the drainage processing method of demanganize draining.