INTERACTION OF MICROBIOLOGICAL AND MEMBRANE TECHNOLOGIES OF WASTEWATER TREATMENT

Abstract

The combination of microbiological and membrane technologies for wastewater treatment from organic substances of various origins is considered. An experimental installation of a membrane-distillation bioreactor is proposed. When carrying out the proposed wastewater treatment in one device, the process proceeds in two stages. The first stage is biological treatment under anaerobic conditions of biogas production, and the second stage is post-treatment using membrane distillation on ultrafiltration membranes. We analyze anaerobic wastewater treatment through horizontal channels by passing through media - thin-sheet filter loads (drains), which contain immobilized microorganisms that form a biofilm layer. Anaerobic digestion is accompanied by the production of biogas, which is collected and discharged into a special tank. Under the action of bacteria during the acetogenic phase, acetic acid is additionally produced from the substances formed in the previous phase, which is decomposed into methane, carbon dioxide and water during methanogenesis. It has been shown that ultrafiltration membranes are used as a wastewater treatment. It is proved that wastewater diffuses through the drainage under the influence of a pressure drop of 200 mmHg and at a temperature of 35-38 °C. It is determined that the treated water can have a high content of organic matter from 100 to 104 mg of impurities/liter of water. As a result of the anaerobic process, the biogas yield was found to be from 0.1 to 6 m3 of biogas/(m2∙day), depending on the content of organic matter in the wastewater. A continuous process of wastewater treatment in a closed technological cycle is proposed.