Abstract: Canneries discharge a large amount of wastewater every day, with high organic content and serious environmental pollution. Taking the Dandong Cannery Factory as an example, by using the air flotation MBR treatment process, the cannery's drainage can reach the national Class A discharge standard for urban sewage treatment plants.
Keywords: organic matter; air flotation; MBR membrane
Foreword
MBR, the full name of membrane bioreactor, is a method of applying membrane technology to sewage treatment Emerging Technologies. MBR can simultaneously achieve the degradation of pollutants by microorganisms and the separation of pollutants by ultrafiltration membranes in a compact space. There is a synergistic effect between degradation and separation. It is an efficient and practical sewage treatment technology. The effluent contains no suspended solids and has very low COD. Only a small amount of disinfectant is added, which avoids secondary pollution of pipelines. The drainage can be reused or directly discharged, realizing the resource utilization of sewage. However, MBR is not used in many actual projects in China. The main reason is that the price of membranes is relatively high, which increases project investment. However, with the maturity of membrane technology and the large-scale production of membrane modules, the price of membranes has been decreasing year by year. At the same time, after the wastewater discharge standards are improved, the MBR process has obvious advantages over the traditional three-stage wastewater treatment method, so this process has broad application prospects. This article combines the sewage treatment project of Dandong cannery factory to introduce the MBR system design of the sewage treatment project of the factory.
Dandong Cannery is an enterprise that produces, processes, and stores canned chestnuts and fruits. Its products are exported to Japan, South Korea, Southeast Asia and other countries and regions. During the production of cans, a large amount of wastewater is produced, and the concentration of suspended solids and organic matter is high, which seriously pollutes the environment. With the enhancement of people's environmental awareness and the intensification of national energy conservation and emission reduction efforts, Dandong Cannery has built a sewage treatment system, using the air flotation MBR treatment process, so that the drainage of the cannery has reached the level A discharge of the national urban sewage treatment plant. standard.