System and method for treatment of contact hydrolysis-algae micro-aeration composite wastewater

Abstract

The invention provides a system and a method for treatment of contact hydrolysis-algae micro-aeration composite wastewater. The system is a complex food chain and microorganism system composed of anaerobion, amphimicrobe, aerobic bacteria and algae; the main body adopts a reaction tank with the water depth being 5-6 m; a filler with the height of 3.5-4 m and large in specific surface area is filled in the reaction tank; water at the upper layer of the filler has the depth of 0.5-1.0 m; a row of aeration facilities is uniformly distributed at the bottom of the water outlet side of the reaction tank; air is introduced to enable a water outlet end to keep the oxygen dissolving rate being about 2 mg / L, and concentration of the dissolved oxygen is in a gradient increase trend in the water flowing direction. According to the method for treatment of wastewater, under the condition of air introduction and combined action of the anaerobion, amphimicrobe, aerobic bacteria and algae, carbonization, nitration, denitrification, absorption and adsorption reactions are performed simultaneously in a reaction system, so that COD, BOD, NH3-N, total nitrogen, total phosphorus and other contaminants in the wastewater are removed. The system has the advantages of low energy consumption and cost, small difficulty in management, and relative small occupied area.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a contact hydrolysis-algae micro-aeration composite sewage treatment system and method. [0002] Background technique [0003] Water is an indispensable natural resource for human development and the material basis for the survival of human beings and all living things. However, with the continuous development of science and technology, a large amount of sewage is produced in production and life, and these sewage is discharged into rivers, which brings serious water pollution problems and seriously threatens human health. It can be seen that it is urgent to start the sewage treatment system. [0004] The existing traditional sewage treatment process usually adopts hydrolytic acidification + contact oxidation, activated sludge method, land treatment of sewage, artificial wetland and other methods to treat domestic sewage or pretreated industrial sewage. However, t...

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Problems solved by technology

[0005] (1) The traditional activated sludge sewage treatment process consumes a lot of energy, and the treatment effect of total phosphorus and total nitrogen is unstable; a large amount of sludge will be produced during the treatment process, which will bring about high costs for sludge treatment and disposal; and the sewage There are also gas pollution sources such as odor in the mud treatment process; in addition, more equipment and more difficult management are also the shortcomings of this treatment process

[0006] (2) The hydrolytic acidification + contact oxidation treatment method also has the problems of high energy consumption and poor removal effect of total phosphorus, as well as the problems of sludge treatment and disposal, but the number of equipment is less than that of the traditional activated sludge method

[0007] (3) Although methods such as land treatment of sewage or artificial wetlands have low energy consumption and less equipment, they occupy a large area, and wetlands still have plant harvesting, clearing and other management