JPS5980389A - Agent for comprehensive disposal of ammonia-contg. liquid matter and comprehensive disposal of said liquid matter - Google Patents

Abstract

PURPOSE:To obtain the titled agent for the comprehensive disposal of ammonia- contg. liquid matter such as waste water, by mixing the specified amount of fine powdery dolomite in the dry precipitate of water granulated slag treated with an acid, and baking said mixture at 350-900 deg.C for 15min-2hr. CONSTITUTION:After granulated slag obtd. from a steel-making furnace and finely pulverized to at least 200 mesh is dissolved in an aqueous inorganic acid solution, an aqueous alkali solution is added to the aforementioned solution to make it alkaline. The resulting precipitate is washed with water, dehydrated and dried to obtain the dry precipitate of water granulated slag treated with an acid. Said dry precipitate is mixed with fine powdery dolomite at a wt. ratio of 1:1-5:1, and the mixture is baked at 350-900 deg.C for 15min-2hr to obtain the agent for the comprehensive disposal of ammonia-contg. liquid matter. When said treating agent is to be added to waste water, its addition ratio is 5-20 times the value of CODMn in the waste water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a comprehensive process for simultaneously removing ammonia, COD and color from an ammonia-containing liquid.
The present invention relates to an integrated treatment method for an ammonia-containing liquid material that uses the processing agent to simultaneously remove ammonia, COD, and color from an ammonia-containing liquid material.

Conventionally, there are many technologies for removing COD or COD from waste water, waste liquid, etc., and they are being developed one after another.

On the other hand, denitrification techniques include, for example, the ammonia removal/denitrification method, the biochemical nitrification/denitrification method, the selective ion exchange method, and the discontinuous point chlorine injection treatment method, among which the ammonia stripping method also Various technologies are being developed.

However, it has been difficult to simultaneously remove ammonia, COD, and color from waste water, waste liquid, or other liquid materials, and there is still no simple and economical method.

The inventors of the present invention have focused on this point, and as a result of intensive research, they have arrived at the present invention. , COD and color can be simultaneously removed by using a comprehensive treatment agent for ammonia-containing liquid materials and a comprehensive treatment method for ammonia-containing liquid materials by said cutting, preferably at least 21)0 meshes of fine powder (HishiT). The granulated slag obtained from this iron-making furnace (hereinafter simply referred to as granulated slag) is dissolved in an inorganic acid water bath solution, the solution is made alkaline by further adding an alkaline aqueous solution, and the precipitate that has precipitated is heated by iH.
Acid-treated granulated slag dried precipitate +4C obtained by washing with water and then dehydrating and drying the washed precipitate +4C Further, fine powder dolomite is mixed in a weight ratio of 1:1 to 5:1. and an ammonia-containing liquid integrated processing agent obtained by baking the mixture at a temperature of 350 to 9 (H)°C for 15 minutes to 2 hours, and one aspect of the present invention is that the above-mentioned baking An acid-treated granulated slag/dolomite mixed treatment agent is added to the liquid to be treated in an amount of 5 to 20 times the amount of COI) M, 11 in the liquid to be treated, and air is added to the liquid to be treated. Alternatively, the COD in the to-be-treated material is
Conducting the treatment for at least 1 hour in such an amount that the addition ratio of Mn to the treatment agent is maintained within the above ratio, and then the treatment agent in the liquid to be treated is separated, thus removing ammonia from the ammonia-containing liquid. , COD and color removal at the same time 1-
The present invention relates to a method for comprehensively treating an ammonia-containing liquid material.

The granulated slag used in the present invention is obtained by rapidly cooling slag obtained from a steelmaking furnace, and an example of the composition of granulated blast furnace slag is shown in Table 1.

In the present invention, as the inorganic acid for dissolving the granulated slag, for example, HCt, HNO3, J(2SO4, ICto4, etc.) are preferably used. An example of the aqueous alkali solution added to the inorganic acid aqueous solution is NaOH.

KOII, NI+4011, (N112)2
A water bath solution such as Co is used.

As the inorganic acid water bath solution, an IN to 5N water bath solution is preferably used, and it is preferable to add granulated slag at a maximum ratio of 157 to 171,100 ml of the inorganic acid aqueous solution. The crushed slag must be pulverized to at least 200 mesh, or if more than 200 mesh is used, d) disintegration with inorganic acids will decrease;
This is not preferable because a dissolved residue remains.

Regarding the firing temperature, if the firing temperature is 350° C. or lower or 900° C. or higher, the specific surface area of the fired product will be small, and the adsorption reactivity will decrease.

The firing time is related to the firing temperature; if the firing temperature is 900°C, the firing time is 15 minutes, and if the firing temperature is 350°C, the firing time is 8'2 hours.

Regarding the addition ratio of treatment agent, C01)M in wastewater.

It is 5 to 20 times the amount, and is obtained from the relationship with the content of organic matter in wastewater, and is usually 5 to 20 times the amount.
Double the amount is sufficient.

The amount of air or water vapor conducted is related to the removal of ammonia, and is controlled by temperature and pi, in which case it should be appropriately determined so as to maintain the above-mentioned addition amount, that is, 5 to 20 times the amount. be.

The present invention will be explained in more detail below with reference to Examples.

Example: Granulated blast furnace slag 1007 pulverized to about 230 ml as shown in Table 1 was added to a 4N-HCt aqueous solution of 1000 rnl.
, plus 20 Or
, p, m.

To this, 1000 mJ of water was added, and then a 4N-Na0Il water bath solution was gradually added to bring the pJ of the solution to 11.0.
3, washed with water until the pH of the washing solution became 7 to 8, and dried the water-washed precipitate at 110°C for about 12 hours. Dolomite was mixed in a weight ratio of 1=1, and the mixture was heated to 8 [10°C
The mixture was fired at a temperature of 1 hour to obtain a fired granulated slag/dolomite mixed treatment agent (ADSD).

As above, use the processing agent DSD Tankoyoru (1).
) Municipal waste landfill leachate and (2) activated sludge treated molasses wastewater are treated as follows.

(1)p■I7.70. CODMn764ppm1 chromaticity 1.244 (457nm absorbance) and ammonia 716
ppm municipal waste landfill leachate 1000ml! To this, the above-mentioned treatment agent (ADS) was added in an amount 10 times the amount of CODMo in the leachate, and sea urchin water vapor was added to the treated liquid at about 80°C for 1 hour so that the distillate concentration was 2 mVmtn. It was communicated.

(2) pH 7,53, CODMn797 pptn
, chromaticity 1.835 (absorbance 457) and ammonia 7
95 ppm activated sludge treated molasses wastewater was treated under the same conditions as in (1) above.

The results are shown in Table 2.

Table 2 The results shown in Table 2 show that the calcined acid treated granulated slag/dolomite mixture treatment agent is excellent in removing COD and reducing chromaticity, especially in removing ammonia.

60

Claims (1)

[Scope of Claims] (2J) of granulated slag scraped from a steelmaking furnace, which has been pulverized to at least 200 meshes, is dissolved in a mechanical acid water bath solution, and alkaline water and solution are further added. The solution was made alkaline, and the precipitate was separated by
After washing with water 1~, the water-washed precipitate was then dehydrated and dried to obtain an acid-treated granulated slag dry precipitate, and finely powdered dolomite was further mixed in a weight ratio of 1=1 to 5:1. , the mixture was heated at a temperature of 350 to 9001C for 15 minutes to 2
Time-fired ammonia-containing liquid 1. (2) The granulated slag produced by T44 from a steelmaking furnace pulverized to at least 200 Metz/U is bath-dissolved in an inorganic 1 finished water bath solution,
The bath liquid is made alkaline by further adding an alkaline water bath liquid, and the precipitated precipitate is separated and washed with water, and then the water-washed precipitate is dehydrated and dried to obtain a dried precipitate of 1-sulfuric acid-treated granulated slag. Then, a mixture of finely powdered dolomite was added at a weight ratio of 1:1 to 5:1σ)','+1 to 9, and the mixture was heated at 350 to 900°C for 15 minutes to 2.
COD in the liquid to be treated,
, □5 to 20 ir'' for the amount of n; tlt IIC
and add it to the liquid material to be treated with
JK air or water vapor is used to remove CO in the liquid to be treated.
1) N4,. conduction for at least 1 hour in such an amount that the addition ratio of the additive to the amount is maintained within the above ratio, thereby removing the processing agent in the liquid to be treated, thus removing the ammonia-containing liquid from the ammonia-containing liquid. Simultaneously removes ammonia, C0I) and color1
- A method for comprehensively treating ammonia-containing liquids.