JPS614597A - Method for simultaneously decomposing, denitrifying and dephosphorizing organic material in sewage component and multipurpose floating filter medium used in said method - Google Patents

Abstract

PURPOSE:To satisfy efficiently regulatory values by throwing a filter medium consisting of a metallic material of high ionization tendency and having puckers and a buoyancy chamber into an aeration vessel. CONSTITUTION:A multipurpose floating filter medium having buoyancy equivalent to the weight of the filter medium is thrown into an aeration vessel, and moved in the current along with a turning flow. Consequently, aerobic microorganism are deposited and propagated on the outer surface of a hollow body 3 of the multipurpose floating filter medium and at the inlet part of the pucker 4, and the organic materials in the sewage components are decomposed and nitrated by said microorganisms. The deep of the pucker 4 and the inside of the hollow body 3 are made anaerobic, and organic nitrogen and ammoniacal nitrogen in said places are converted into nitric nitrogen. The nitric nitrogen is denitrified in the anaerobic part of the filter medium.

Description

[Detailed Description of the Invention] The present invention aims to solve the problem of eutrophication, which has become a problem with the recent rapid development of culture, economy, and industry.
It concerns a method of decomposing, denitrifying, and dephosphorizing organic matter in sewage components that are the cause of this problem, and a filter medium used in the method. There are various methods for decomposing organic matter in sewage components, and the current mainstream method is the standard activated sludge method specified in the standards for sewage facilities. However, although the standard activated sludge method can achieve the legally regulated values for removing BOD, COD, 88, etc.
Since denitrification and dephosphorization are insufficient, a tertiary treatment facility must be installed to remove this.

Currently, there are two methods for treating nitrogen: chemical treatment and biochemical treatment; the former includes ammonia stripping,
Zeolite adsorption method, hydrogen injection method, ion exchange method, etc. The latter include cyclic nitrification and denitrification method, methanol injection method, submerged rotating disk method, etc. Next, regarding dephosphorization, dephosphorization is mainly performed as a metal oxide. Namely, a method of coagulation by adding a coagulant, a catalytic dephosphorization method using cal/umenohydroquine apatite, a biological dephosphorization method,
There are also adsorption methods.

In short, in order to equip sewage terminal facilities using the standard activated sludge method currently in use with denitrification and dephosphorization equipment,
Avoid the need for large sites and large construction costs, as well as the large number of wasteful and redundant parts that are not designed with denitrification and dephosphorization in mind from the beginning. This is something that cannot be done.

The present invention is capable of efficiently clearing legal regulation values while minimizing remodeling and expansion of old facilities, that is, N%P,
An object of the present invention is to complete the treatment of wastewater in a secondary treatment facility such as a sewage treatment plant.

Next, as a means to solve the above-mentioned problems, first, the organic matter is biochemically decomposed by opportunistic microorganisms as before. In other words, when a multi-purpose floating filter material with a buoyancy equal to the weight of the filter material is placed in an aeration tank into which air or pure oxygen is blown out from an aeration device, and the material is moved through the flow with a swirling flow, the In addition, aerobic microorganisms are resistant to propagation on the outer surface of the hollow body 3 of the multipurpose floating filter medium and the inlet portion of the pleats 4, and these microorganisms decompose and nitrify organic matter in the sewage components.

The deep part of the folds 4 of the filter medium and the vicinity of the inside of the hollow object 3 are as follows:
The air from the air diffuser cannot reach the air, resulting in an anaerobic condition. Roast it,
The inflowing organic nitrogen, ammonia nitrogen, and nitrite nitrogen are nitrified by the action of aerobic microorganisms and converted to nitrate nitrogen. This nitrified nitrate nitrogen is denitrified by the action of anaerobic microorganisms in the anaerobic portion of the filter medium.

Next, regarding dephosphorization, the material in the example is made of iron, which gradually corrodes as it floats in sewage, and microorganisms are present on the outer and inner surfaces of the pleats 4 and the hollow object 3. It becomes sticky and sticky. A portion of the iron material turns into iron ions, which combine with phosphoric acid dissolved in the sewage to become iron phosphate and precipitate. A part of the phosphoric acid is absorbed by aerobic microorganisms, and after the microorganisms die, it becomes sludge and settles.

Now, regarding the effects of the invention, the decomposition of organic matter and nitrification by aerobic microorganisms have already been generally confirmed and used in the standard activated sludge method, and denitrification by anaerobic microorganisms can also be achieved using submerged rotating disks. Its effectiveness has been confirmed through experiments. Regarding dephosphorization, the clay layer in the soil is known to have a dephosphorizing effect. This is because clay contains a lot of iron ions. Therefore, this multipurpose floating filter medium is effective in decomposing organic matter, nitrification, denitrification, and denitrification.

[Brief explanation of drawings]

Figure 1 is a side view, Figure 2 is a plan view, Figure 3 is Figure 1A-
A sectional view.

Claims (1)

[Claims] 1. A filter medium made of a metal material with a high ionization tendency and having pleats (4) and a buoyancy chamber (1) is placed in an aeration tank of a sewage treatment facility, etc., and aeration is carried out. A sewage system characterized in that the filter medium is suspended along with the swirling flow of sewage generated by an aeration device in the tank to simultaneously perform decomposition, denitrification, and dephosphorization of organic matter in the sewage components. A method of simultaneously performing decomposition, denitrification, and dephosphorization of organic matter in components. 2 Decomposition of organic matter in sewage components made by assembling hollow objects (3), folds (4), and buoyancy chambers (1) made of metal materials with a high ionization tendency with spacers (2), etc. A multi-purpose floating filter medium characterized by simultaneous denitrification and dephosphorization.