Wastewater treatment method using magnetism biological carrier and magnetic separation technique

Abstract

The invention relates to a sewage treatment method of adopting magnetic biological carrier and magnetic separation technique, belonging to the technical field of environmental protection, which comprises the following steps: magnetic biological carrier with density 1.0 to 1.4g / cm<3> and particle diameter 0.043 to 0.315mm is put into an aeration tank, the generated remained sewage can realize mud and water separation by magnetic separation technique, and then is put into a carrier de-molding separator, so as to realize the separation between mud and magnetic carrier, after magnetic separation, the magnetic carrier renews to be placed into the reactor, so as to realize recovery and reutilization of magnetic carrier. When the carrier additive is between 4 and 13g / L, the aeration amount is 50 to 100L / h, air apparent flow rate is 1.8 to 3.5m<3>(m<2> x h), waterpower retaining time is 1-5h, reflux ratio of the mixed liquid is 1-6, after checking, the removal ratio of effluent COD can reach 92.0 to 98.2%. When used for sewage treatment, the method in the invention has advantages of good treatment effect, simple method, strong controllability, and facility for industrial production; while obviously reducing effluent COD, the investment can be reduced and running cost can be lowered.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a sewage treatment method using magnetic biological carriers and magnetic separation technology. In particular, the magnetic biological carriers involved are added to the aeration tank in the sewage treatment by the activated sludge method, which can increase the aeration rate. The bioconcentration in the air pool improves the efficiency of sewage treatment. At the same time, the magnetic biological carrier realizes the separation of mud and water through magnetic separation technology, which can reduce the loss of the carrier and reuse it after stripping. Background technique [0002] At present, more than 40% of the existing sewage treatment plants in our country adopt the traditional activated sludge method, which has the disadvantages of large area, long treatment time, and low treatment efficiency per unit area. Therefore, improving the efficiency of sewage treatment an...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of existing biological carriers such as high energy consumption of circulation and reflux in wastewater treatment, difficulty in removing the film of the carrier, and complicated operation and management, so as to select a biocarrier with magnetic response performance, large specific surface area, easy film formation, density and The magnetic biological carrier is similar to the sewage, and the magnetic separation technology is used to realize the separation of mud and water, which can reduce the loss of the carrier, and then put it into the carrier stripping separator to achieve the purpose of separating the sludge and the magnetic carrier. Putting it into the reactor to realize the recovery and reuse of magnetic carrier is a kind of sewage treatment method