SU785224A1 - Method of waste water purification - Google Patents

Description

The invention relates to methods of purification of wastewater from nitrates, mainly wastewater production of caprolactam, and can be used at the enterprises of the chemical industry.

Known methods of wastewater treatment by biological method, the essence of which lies in the ability of microorganisms.

in the course of its vital activity, use organic compounds and under-oxidized mineral substances contained in the waste waters of the river D.

The closest to the proposed invention is a method for purifying waste water by denitrification, nitrate wherein neutralization is achieved by reduction of bacteria nitric acid salts to free nitrogen under slight _w of soluble oxygen £ 2].

The disadvantage of this method is the impossibility of achieving a high degree 2

Nor 'ι treatment of highly concentrated nitrate wastewater.

The aim of the invention is to increase the degree of purification of highly concentrated nitrate wastewater.

This goal is achieved by introducing riboflavin into activated sludge. Riboflavin is a stimulating factor regulating the synthesis of the enzyme nitrate / copper, which carries out the final process of hydrogen transfer from organic compounds to the oxygen of nitrates. Thereby, the oxidation of organic substances and the reduction of nitrates to free nitrogen in the process of denitrification are carried out. *

The invention consists in the following.

Through activated sludge, V -3 l, treated with riboflavin (1-10mmkg of riboflavin per 1 ml of sludge mixture), a highly concentrated nitrate runoff with a pH of 7.2, having the following composition mg / l, is passed through the day:

785224

Nitrogen Nitrogen N (ΝΟ3) 510

Ammonium Nitrogen Μ (MH4) 70

Nitrite nitrogen Μ (Ν0 _? (16,2

COD. 4080

Phosphates 9.24

Concentration ^: sludge in denitrif [gator C (sludge) 7.0

Concentration of dissolved 0 ^ in silt "1,7"

Flow temperature '26 ^In C

Purified runoff CPH 9.2 has the following composition, mg ^ l:.

Nitrogen Nitrate -M (Missing

Ammonium Nitrogen No. (ΝΗ4) '4.8 Nitrite Nitrite N (N00) 0.08

COD '510

Phosphates Traces

Sludge C (sludge) concentration. 7.0

Dissolved concentration

0 ₂ 1.7 M

The flow temperature is 26 ° С;

Comparative data in the table

15

With the addition of riboflavin Without adding riboflavin M <- 140¾), mg / l N (ΝΟ3), mg / l Incoming stock Purified I act • Clean

25

ten

Table continuation

With the addition of ri Zez add boflavin riboflavin N (Oe), mg / l Ν (Η0 "\ μγ / π I enter Cleared Proceedings Wipe running stock ny running stock puppy 820 "Y 585 47 / 980 and 650 90

Cleaning degree

100% - ......... 86%

The table shows that in the case of adding riboflavin to activated sludge, the degree of purification increases to 100% and the concentration of nitrates in wastewater undergoing reduction can be increased by 2-2.5 times as compared with the known method.

Claims (2)

The invention relates to methods for the purification of wastewater from nitrates, preferably wastewater produced by Caprolactam, and can be used in chemical industry. The methods of sewage treatment by biological method are known, the essence of which is the ability of microorganisms to use organic compounds and under-accumulated mineral substances contained in wastewater flj "in their life processes. The closest to the proposed invention is the method of wastewater treatment by denitrification method, where it is deactivated nitrates are solved by reducing the nitrate nitric acid with bacteria to free nitrogen under conditions of low levels of soluble The disadvantage of this method is the impossibility of achieving the degree of CLEANING of highly concentrated nitrate wastewater. The aim of the invention is to increase the degree of purification of highly concentrated nitrate wastewater. This goal is achieved by the addition of riboflavin to activated sludge. Riboflavin is a stimulating factor regulating the enzyme nitrate 2) -cartase, which carries out the final process of transferring hydrogen from organic compounds to the oxygen of nitrates. In this way, the oxidation of organic substances and the reduction of nitrates to free nitrogen in the process of denitrification are carried out. The invention is as follows. activated sludge, V-3 l, treated with riboflavin (1-10mmkg of riboflavin per 1 ml of sludge mixture), pass over the course of the day highly concentrated HNN at the pH of 7.2, having the following composition mg / l: Nitrogen nitrate C (N0) 510 70 Nitrogen ammonium U (MN) Nitrite nitrogen 1 (NQ 9 16.2 COD / 4080 Phosphates 9,: 24 The concentration of K in the denitrizer C (nla) Concentration of the dissolved 0 l in silt Nitrate nitrogen .N (YAO) Omission nitrogen Ammonium nitrogen IJ) 4 Nitrite nitrite N (NOi) 0.08 PhosphatesHealth Sludge C concentration (sludge). 7.0 Dissolved O: Concentration ... Drain Temperature 26 0 Comparative data is given in the table With the addition of additives without adding Ifiiu2iaa§iffia. N (N03). MI NOj), mg / l Enrollment. Eyes Are Cleared, Incoming In. And Stock Stock LfflgHHJ Lack of Lack Same Same As Continued &amp; eHbja4K, cTKjK 100% -86% From the table it can be seen that if riboflavin is added to active sludge, the degree of purification can be increased to 100% and the concentration of nitrates in wastewater undergoing reduction can be increased by 2-2.5 times compared with the known method . The invented formula and the method of wastewater treatment by biological denitrification with activated sludge, characterized in that. In order to increase the degree of purification of highly concentrated nitrate wastewater, riboflavin is introduced into active sludge. Sources of information taken into account in the examination 1. Rogovska I.N., Biochemical method of purification of industrial wastewater. M .. Publishing house of literature on construction. 1967. C.5 .. 2. Koleshko I. A. Microbiologists. M .. Higher school. 1977. p.141, 210-211 (prototype) ..