Domestic-wastewater efficient nitrogen-and-phosphorus-removal treatment method

Abstract

The invention discloses a domestic-wastewater efficient nitrogen-and-phosphorus-removal treatment method. The method includes the following steps that domestic wastewater is oxidized and enters a filtering pond filled with quartz sand and limestone for filtering; the filtered wastewater enters an aeration zeolite biological tank and is subjected to adsorption nitrogen-and-phosphorus-removal treatment through zeolite; the treated wastewater is injected into a flocculation settling pond for flocculation settling treatment; the water obtained after flocculation settling treatment enters a phosphorus-removal settling pond for phosphorus-removal treatment, the treated water is chlorinated, and purified water is obtained. By means of the method, nitrogen and phosphorus in domestic wastewater can be effectively removed, it can be prevented that domestic wastewater is directly discharged and pollutes the environment, secondary pollution can be avoided, and the treatment cost is low.

Description

Technical field: [0001] The invention relates to the field of waste water treatment, in particular to a treatment method for efficient denitrification and phosphorus removal of domestic waste water. Background technique: [0002] A large amount of sewage containing nitrogen, phosphorus and inorganic salts produced by human activities enters the water body, increasing the nutrients in the water body and promoting the vigorous growth of autotrophic organisms. With the development of eutrophication, the number of individual algae increased rapidly, while the species gradually decreased. The growth period of algae is short, the reproduction speed is very fast, and the dead aquatic organisms decompose under the action of microorganisms, continuously consume oxygen, or produce hydrogen sulfide under anaerobic conditions, which continuously deteriorates the water quality. Therefore, the above series of changes are all caused by the increase of algae, and the increase of algae is c...

AI Technical Summary

Problems solved by technology

The main disadvantages of the flocculation-sedimentation method are that a large amount of flocculant needs to be added, the economic operation cost is high, and a large amount of sludge that is difficult to handle is produced, which is easy to cause secondary pollution

Due to the complex process, high management requirements, unstable denitrification and phosphorus removal effect, and the effluent quality sometimes failing to meet the standards, the biological method still has certain difficulties and limitations in effective deep nitrogen and phosphorus removal.

The adsorption method overcomes the shortcomings of high operating cost, large amount of sludge that is difficult to handle, and unstable operation. It is currently one of the most effective methods for denitrification and phosphorus removal of wastewater with low investment in research and development, low operating costs, and simple operation and management. If the adsorbent used in the adsorption treatment method is improper, it will easily cause secondary pollution to the water body and increase the cost of wastewater treatment.