KR19980077862A - Industrial wastewater denitrification and purification - Google Patents

Abstract

The present invention is to remove the total nitrogen (TN), color, COD, BOD and dispersed solids (SS) removal rate of all industrial wastewater, including dye wastewater, livestock wastewater and leather wastewater containing nitrate nitrogen and ammonia nitrogen It is a new technology that removes more than%.

In the present invention, the above-mentioned industrial wastewater is purified by electrolyzing 1,000-2,000 ppm of chloride solid powder or aqueous solution of metals such as ferric chloride, PAC and ferrous chloride at a voltage of 6-12V. .

Description

Industrial wastewater denitrification and purification method

The present invention uses femide bonds of manure or animal wastewater amino acids containing a large amount of dyeing wastewater or ammonia nitrogen, which are used as a dyeing agent when weaving or dyeing acrylics, and using ammonium sulfate as a cleaning agent containing a surfactant. In order to significantly reduce the total nitrogen (TN) of industrial wastewater such as leather wastewater containing a large amount of protein, a technique of electrolyzing chloride of metal such as ferric chloride into these industrial wastewater will be.

Nitrogen or phosphorus is used as an important food for microorganisms, but when the water content of total nitrogen (TN) and phosphorus (P) combined with ammonia nitrogen and nitrate nitrogen is excessive and the water temperature increases, green algae occur in solders, lakes and rivers. In salty offshore waters, red tide occurs, causing enormous damage to freshwater and ocean farming.

In order to prevent green algae and red tide, the total nitrogen must be regulated, so in Korea, the total amount of TN has been regulated to 60 ppm since the second half of this year.

However, no effective and economic method of TN regulation has been developed to date. However, the method of lowering the TN by installing aerobic aeration tank and anaerobic aeration tank at the same time has been developed. However, due to enormous equipment cost and technical difficulties, it is used only in industrial sites that are extremely limited at home and abroad.

In particular, the aerobic aeration tanks are installed in the industrial sites, including the dyeing industry in Korea, but there is a sad situation that even the space for installing anaerobic aeration tanks cannot be prepared.

In the present invention, the electrolytic apparatus is immersed in the reaction tank installed between the sump tank and the aeration tank to inject some metal chloride mixture or a single substance and then electrolyze to effectively reduce the COD, BOD, SS, color and TN of industrial wastewater. Developed new technology.

This technique is closely related to the patent applications 96-14619, 96-22480, 96-52501 prior to the present invention, but the invention described above for the denitrification effect has been carried out. none. An embodiment of the present invention that completely solves the economic, spatial and technical difficulties of the current denitrification technology (nitrogen removal technology) mentioned above will be mentioned as follows.

[Experiment 1]

2.0 ml of 3M ferric chloride solution was added to 1,000 ml of dyed wastewater having pH = 11.3 and COD = 921.0 ppm, and electrolyzed for 30 minutes while bubbling with air.

[Experiment 2]

2.0 ml of 3M ferric chloride solution was added to 1,000 ml of the same dyeing wastewater as in Experiment 1, and electrolyzed for 30 minutes while bubbling with air.

[Experiment 3]

Into the same dyeing wastewater 1,000ml of Experiment 1, 2.0M 3M PAC (polyalumium chloride) was added and decomposed for 30 minutes while bubbling with air.

[Experiment 4]

3M CaCl2.0ml was added to 1,000ml of the same dyeing wastewater as in Experiment 1, and electrolyzed for 30 minutes while bubbling with air.

[Experiment 5]

1,000 ml of the same wastewater as Experiment 1 was added with 1.0 ml of 3M FeCl and 1.0 ml of 3M PAC, followed by electrolysis for 30 minutes while bubbling with air.

[Experiment 6]

In 1,000 ml of the same dyeing waste water as Experiment 1, 0.5 ml of 3M FeCl 1.0 ml and 3 ml PAC and 0.5 ml of CaCl were added and subjected to electrolysis for 30 minutes while bubbling with air.

As shown in Table 1 to Table 6, when FeCl2.0ml was added to 1,000ml of dye wastewater with total nitrogen (TN) of 1,460 ppm and electrolyzed for 30 minutes, the TN removal rate was 91.6%, and FeCl, PAC and CaCl were the highest. TN removal rate was more than 80% when 2.0 ml of each or mixed reagent was added to 1,000 ml of the same dyeing waste water and electrolyzed for 30 minutes. The COD removal rate was 70-86%, and the chromaticity was almost completely colorless with 95% or more removal from black.

This phenomenon is caused by the denitrification and discoloration of chlorine ion (Cr) or reduction of chlorine molecules (Cl) produced by anodization by electrolysis in the reduction of ammonia nitrogen (NH-N) or nitrate nitrogen (HNO-N). You can think that it plays an important role.

Claims (4)

A method for denitrifying ammonia nitrogen and nitrate by electrolyzing dyeing wastewater with metal chlorides such as FeCl ₃ , FeCl 2, PAC and CaCl 2. Technology for treating manure and livestock wastewater by the method of claim 1 Technology for purifying petrochemical and leachate by the method of claim 1 A technique for treating all industrial wastewater including dyeing wastewater, animal husbandry wastewater, and petrochemical wastewater using all chlorine compounds or chlorine other than the metal chlorides as described in claim 1 by the method of claim 1.