JPS5980388A - 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 ammonia-contg. liquid matter disposal, by adding the specified amount of fine powdery magnesium hydroxide sludge after being dehydratively dried to the dry precipitate of water granulated slag after being treated with an acid. CONSTITUTION:Granulated slag from a steel-making furnace after being finely pulverized to at least 200-mesh is dissolved in an aqueous inorganic acid solution, and precipitate formed by making said solution alkaline is washed with water and dried to obtain dry precipitate. Said dry precipitate of granulated slag treated with an acid is mixed with dehydratively dried fine powdery magnesium hydroxide sludge at a wt. ratio of 1:1-5:1, and the mixture is baked at a temp. of 350-900 deg.C for 15min-2hr to obtain the agent for ammonia-contg. liquid matter disposal. 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 method for simultaneously producing ammonia and
Ammonia,
This invention relates to an integrated treatment method for an ammonia-containing liquid material that simultaneously removes COD and color.

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

-Denitrification techniques include, for example, ammonia stripping method, biological nitrification/denitrification method, selective ion exchange method, and discontinuous point chlorine injection treatment method. technology is being developed.

However, it has not been known to simultaneously remove ammonia, COD and color from waste water, waste liquids or other liquids, and no good and economical method exists yet.

Unexploded IJJ people focused on this point and as a result of intensive research, they arrived at the present invention.The gist of the invention is as described above. Simultaneously removing ammonia, COD and color from A71i or other liquids' 1-8 An integrated treatment agent for ammonia-containing liquids and a method for the integrated treatment of ammonia-containing liquids using the agent. C. The pulverized granulated slag obtained from a steelmaking 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 water bath solution, and the precipitated precipitate is removed. The acid-treated granulated slag dried precipitate obtained by washing the washed precipitate with water, and then dehydrating and drying the washed precipitate, was further dehydrated and dried with finely powdered magnesium hydroxide sludge in a weight ratio of 1:1 to 5. : 1, and the mixture was mixed at a ratio of 35
The present invention resides in an ammonia-containing liquid integrated beating agent calcined at a temperature of 0 to 900°C for 15 minutes to 2 hours, and the main feature of the present invention is to provide the above-mentioned calcined acid-treated granulated slag/magnesium hydroxide sludge. The processing agent is added to the C in the liquid to be processed.
It is added to the liquid to be treated in an amount of 5 to 20 times the amount of ODMn, and air or water vapor is added to the liquid to be treated, so that the amount of CODMn in the liquid to be treated is equal to the addition rate of the treatment agent. A small amount (both 1
1414 agent in the liquid material to be treated.
1 separate and thus the ammonia meter E J'i&!
The present invention provides an integrated treatment method for an ammonia-containing liquid that simultaneously removes ammonia, COD, and color from the proboscis.

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.

Table 1 Magnenium hydroxide sludge (usually about 60% water content) used in the present invention is the sludge obtained after recovering magnesium hydroxide from seawater, and its composition (absolutely dry state) is as shown in Table 2. It is.

Table 2 Magnesium hydroxide sludge (typically 60% water content) can be dehydrated and dried by a conventional treatment at 110° C. for 12 hours.

In the present invention, as the inorganic acid for dissolving the granulated slag, for example, HCl, HNO3, H2SO4, I (C104, etc.) are preferably used, and the granulated slag is dissolved at a dissolution temperature of room temperature or heating up to 100°C. Examples of the alkaline water bath solution to be added to the inorganic acid aqueous solution include NaOH.

Aqueous solutions of KOH, NH4OH, (NH2)2Co, etc. are used.

Incidentally, as the inorganic acid aqueous solution, an IN to 5N water bath solution is preferably used, and an inorganic acid water bath solution of 100+nI! Preferably, the granulated slag is added in a proportion of at most 152%.

In the present invention 1, the granulated slag used is at least 20
Although it can be pulverized to 0 mesh, it is not preferable to use 2 mesh or more because the solubility in inorganic acids decreases and undissolved residue remains.

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

The firing time is related to the crystallinity of the firing, and the firing time is strictly limited to 15 minutes at a firing temperature of 9°C (15 minutes at 350°C and 2 hours at 350°C).

The addition ratio of the treatment agent is 5 to 20 times the amount of CODMn in the wastewater, which was obtained from the relationship with the content of organic matter in the wastewater, and it is usually 5 to 20 times the amount of CODMn in the wastewater. It is sufficient.

Regarding the amount of conduction of air, dust, or water vapor, it is related to the removal of ammonia, and the amount of conduction is controlled by temperature and pH.
In that case, the above-mentioned addition amount, that is, 5 to 20 times the amount, is appropriately determined so as to be maintained.

The present invention will be explained in more detail below by way of examples.

Example 1 Granulated blast furnace slag 1007 shown in Table 1, pulverized to about 230 ml, was added to 10,100 O of a 4N-HC7 water bath, and heated at 200 r using a Madai tick stirrer.
p.m.

to obtain a solution, to which 1000rnl of water was added, and then a 4N-NaOH aqueous solution was gradually added to reduce the pH of the bath liquid.
H was set to 11.0. The precipitate thus precipitated was separated by JT, washed with water until the pH of the washing solution became 7 to 8, and the washed precipitate was dried at 110°C for about 12 hours to obtain 1.
311! .

Acid-treated granulated slag dried precipitate and pre-formed dehydrated finely powdered magnesium hydroxide sludge were mixed at a weight ratio of 1=1, and the mixture was calcined at a temperature of 400°C for 1 hour. Calcined acid-treated granulated slag/magnenium hydroxide slurry mixed treatment agent (AI) SMgS) is a) j.

The treatment of (1) municipal waste landfill leachate and (2) activated sludge treated molasses wastewater using the treatment agent (ADSMgS) obtained as described above is as follows.

(1) pH 7.70, CODMn 764 ppm,
Chromaticity 1.244 (457℃m absorbance) and ammonia 7
The above treatment agent (ADS) was added to 1000 ml of municipal waste landfill leachate containing 16 ppm CODMn in the leachate.
Add 10 times the amount vertically to the liquid to be treated at about 80°C.
Steam was passed through the reactor for 1 hour so that the amount of distillate at °C was 2 me/min VC/1'.

(2) pH 7.53, CODM, 797 ppm
Activated sludge treated molasses wastewater with color Jf-1,835 (457 plane absorbance) and 795 ppm ammonia was treated under the same conditions as above.

The results are shown in Table 3.

Measurements in Table 3 (conducted at 1C) The results in Table 3 show that the mixed treatment agent for calcined acid-treated granulated slag and magnesium hydroxide sludge is excellent at removing COD, reducing chromaticity, and removing ammonia. Removal was remarkable.

Regarding the addition ratio of the processing agent, X20 shows the best results, but considering the different j° of the processing agent after treatment, XI
O to X15 are preferred.

Example 2 The calcined acid-treated granulated slag obtained in Example 1 and the magnesium hydroxide sludge mixed treatment agent (ADSMgS) were added to the activated sludge-treated molasses wastewater shown in (2) of Example 1: 301) m
Add 10 times the amount of CODMo in 1, and add it to W at 80°C.
Air was passed through the wastewater at a rate of 900 ml'mln for 1 hour at iA degrees. The results are as shown in Table 4.

Table 4 From the results shown in Table 4, the calcined acid-treated granulated slag/magnesium hydroxide/umsurasodi mixed treatment agent showed a 1" difference in the removal of Cot) and the reduction of chromaticity, which was particularly noticeable in the removal of ammonia. Ta.

! Chamberlain applicant Director of the Agency of Industrial Science and Technology Kawa 1) Yutaka Immediate question
Kenji Tashiro, Patent Attorney, Environmental Technology Development Co., Ltd.

Claims (2)

[Claims] (1) Granulated slag obtained from a steelmaking furnace pulverized to at least 200 mesh is dissolved in an inorganic acid aqueous solution, the solution is made alkaline by further adding an alkaline aqueous solution, and the precipitated precipitate is separated by P and washed with water. Then, to the acid-treated granulated slag dried precipitate obtained by dehydrating and drying the water-washed precipitate, further dehydrated and dried fine powdered magnesium hydroxide sludge was added in a ratio of 1 to 5:1 by weight. The mixture was baked at a temperature of 350 to 900°C for 15 minutes to 2 hours to obtain an ammonia-containing liquid integrated treatment agent. (2) At least 20 I) Granulated slag obtained from a steelmaking furnace pulverized into a mesh is bath-dissolved in an inorganic block solution, and the solution is made alkaline by further adding an alkaline water bath solution, and the precipitation is carried out. 1. The precipitate was washed separately with water, and then the washed precipitate was dehydrated and dried. M amount of dehydrated and dried fine powder magnesium hydroxide sludge was added to the acid-treated granulated slag dry precipitate obtained. CODM in the liquid material to be treated is obtained by baking a mixture mixed at a ratio of 1:1 to 5:1 at a temperature of 350 to 900° C. for 15 minutes to 2 hours. 5 to 20 times the amount of CODMn added to 3 g of the liquid material, and air or water vapor is added to the material to be treated, so that the amount of CODMn in the liquid material to be treated and the addition rate of the additive are as described above. The treatment agent in the liquid to be treated is separated by f-1, and thus ammonia, ammonia, and
A comprehensive treatment method for ammonia-containing liquids that simultaneously removes COD and color.