Method for deeply treating sewage by using calcined pyrite as filtering material

Abstract

The invention discloses a method for deeply treating sewage by using calcined pyrite as a filtering material. The method is characterized in that calcined pyrite is adopted as the filtering material. Anaerobic microbes such as denitrifying bacteria, thiobacillus denitrificans, iron-oxidizing bacteria depending on nitrate, ammonia-oxidizing bacteria, and the like are loaded on the surface of the filtering material. Second-stage treatment discharged water from a domestic sewage treatment factory, eutrophic ground surface water, or aquaculture water is continuously delivered to a filtering tank loaded with calcined pyrite for treatment, until phosphorous concentration of discharged water exceeds 0.1mg / L. With the method provided by the invention, a comprehensive effect of synchronous nitrogen removing, phosphorous removing, and organic pollutant concentration reducing is provided. The treatment efficiency is high.

Description

1. Technical Field [0001] The invention relates to a method for deep denitrification and dephosphorization treatment of domestic sewage and eutrophic water. 2. Background technology [0002] With the intensification of water pollution, eutrophication has generally occurred in surface water bodies in my country. This requires stricter nitrogen and phosphorus removal treatment for sewage. The nitrogen in the secondary effluent of domestic sewage and the surface landscape water mainly exists in the form of ammonia, nitrate, nitrite and organic nitrogen, and the phosphorus mainly exists in the form of orthophosphate and organic phosphorus. [0003] At present, the advanced treatment of ammonia nitrogen in water is mainly through microbial nitrification in the aerated biological filter, which converts ammonia nitrogen into nitrate and nitrite nitrogen. The removal rate of ammonia nitrogen can reach more than 90%, and the removal rate of total nitrogen is not high, generally 20 -40%. ...

AI Technical Summary

Problems solved by technology

[0010] Third, Thiobacillus denitrificans is an anaerobic microorganism and cannot play a role in an aerobic system, but water always contains a certain amount of dissolved oxygen. How to use technology to provide anaerobic ecological environment for anaerobic microorganisms such as Thiobacillus denitrificans , promoting the metabolism of such microorganisms to reduce nitrate is the key issue;

[0011] Fourth, some anaerobic nitrate-reducing bacteria such as Thiobacillus denitrification are autotrophic bacteria, and the value-added rate is slow, especially at the start-up stage of the treatment system, the concentration of anaerobic denitrification microorganisms is low, and the treatment effect is poor

[0012] Although the activity of natural pyrrhotite is higher than that of pyrite, since the particle size of natural pyrrhotite is in the micron-millimeter range and the specific surface area is small, the hydraulic retention time of 10- 24h, resulting in low processing efficiency

Images