PROCESS FOR PURIFICATION TREATMENT OF WASTEWATER AND APPARATUS FOR PURIFICATION TREATMENT OF WASTEWATER

摘要

A process for purification treatment of polyvinyl alcohol-containing wastewater according to a membrane separation activated sludge method, comprising adding a nutrient into the system. It is preferable that the nutrient is added into an aeration tank. It is preferable that the nutrient contains nitrogen. It is preferable that the initial quantity of the nutrient added is 5 to 25% in terms of nitrogen. The process includes a step for measuring the post-treatment nitrogen content. It is preferable that the quantity of the nutrient to be added is regulated on the basis of the result of the measurement while checking the effect on the basis of chemical oxygen demand. The addition of the nutrient into the aeration tank may be carried out by a mechanism for adding the nutrient into the treatment system or by throwing the nutrient manually into the treatment system.