SU1315390A1 - Method for biochemical treatment of waste water - Google Patents

Abstract

The invention relates to methods for the biochemical treatment of wastewater from organic and inorganic impurities and may be found in the chemical, petroleum refining, food, petrochemical, and pulp and paper industries. The aim of the invention is to increase the degree of purification and increase the oxidizing power of the treatment plant. The biochemical purification method involves treating a preconcentrated population of the original activated sludge with nitrosomethyl urea or dimethyl sulfate, followed by introducing it into the wastewater. Preferably, the mutagen is subjected to a pre-concentrated population of the original activated sludge to a concentration in the suspension of 10-50 g / l. 1 hp f-ly, 2 tab. (O S / s

Description

The invention relates to methods for the biochemical treatment of wastewater from organic and inorganic impurities and may find application in the chemical, petroleum refining, food, petrochemical and pulp and paper industries.

The purpose of the invention is to increase the degree of purification and increase the oxidizing power of sewage treatment plants.

The method is carried out as follows.

- The initial sludge population is concentrated by any known method (for example, pressure flotation) to a slurry concentration in a suspension of 10-50 g / l. Concentrated sludge in the amount of 4900 ml is treated by the known method with a mutagen (nitrosomethylurea), 1 g of which is pre-dissolved in .100 ml of phosphate buffer pH 5.5-6 and mixed with a suspension of activated sludge during aeration. Depending on the required time, they are maintained for 1, 3, 5, 6, 10, 18 and 24 hours. To the treated sludge, add a 2% alkali solution to pH 9 in order to decompose the mutagen residues and mix thoroughly.

The treated sludge is introduced into the treatment plant, to which the concentrated wastewater is supplied. On the second or third day, the concentration of activated sludge in the sludge liquid is 2.5-3 g / l, i.e. the working concentration at which the purification is carried out.

Example 1. Active sludge from a sewage treatment plant in an amount of 1 liter at a concentration of 2.5 g / liter is concentrated to a content of 10 g / liter. Obtain 0.25 l of a suspension of active sludge, which is treated by a known method with a mutagen (nitrosomethylurea, dimethyl sulfate) at the rate of 0.7 g of mutagen per 1 l of suspension. After exposure at 1,3,5,6,10,18 and 24 hours exposure and release from the mutagen residues, the treated sludge is put into the eyes

ten

15

20

25

thirty

35

40

45

50

The facility, which serves concentrated wastewater.

PRI mme R 2. Active sludge from a treatment plant in an amount of 1 liter at a concentration of 2.5 g / liter is concentrated by pressure flotation to a content of 20gl / l. 0.125 l of a suspension of active sludge is obtained, which is treated by a known method with a mutagen at the rate of 0.7 g mutagen per 1 l of suspension. After exposure at exposures of 1, 3, 5, 6, 10, 18 and 24 hours and the release of mutagen residues, the treated sludge is introduced into a sewage treatment plant, where concentrated wastewater is supplied.

PRI me R 3. Active sludge from a treatment plant in an amount of 100 liters at a concentration of 2.8 g / l is concentrated to a sludge content of 50 g / l. Get 5,55 l of suspension, which is treated with a mutagen at the rate of 0.7 g of mutagen per 1 l of suspension. After exposure at exposures of 1, 3, 5, 6, 10, 18 and 24 hours and the release of mutagen residues, the treated sludge is introduced into a sewage treatment plant, where concentrated wastewater is supplied. On the third day, the concentration of sludge in the sludge liquid is 3 g / l and the cleaning process is carried out.

EXAMPLE 4: Active sludge from a treatment plant in an amount of 100 liters at a concentration of 5 g / l is concentrated by gravity compaction to 10 g / l, then the resulting suspension is concentrated by centrifugation to 60 g / l. 8.3 L of the ointment mass is obtained, through which air bubbling is difficult, the contact of the phases deteriorates. With the available technical means it is not possible to technologically process the process, since stagnant zones are created, which leads to the decay of the activated sludge and the loss of its activity. The process almost does not go.

The results of biological wastewater treatment in examples 1-3 in comparison with the known method are given in table. one.

Method of ravine - Concentration eagr e- Degree

a COD, mCO / l, cleaning.

in water

X

I arrive after cleaning

with

Proposed

2 3

natural

13080

15800

26800

1197

92

126

134

54

99.3 99.2 99.5

95.5

In tab. 2 presents comparative data on the concentration of activated sludge and the consumption of a mutagen according to the invention.

Claims (2)

1. A biochemical wastewater treatment method with activated sludge, which involves treating a population of activated sludge with nitrosomethylurea or dimethyl sulfate followed by introducing mutated activated sludge into wastewater, characterized in that, in order to increase the degree of purification and oxidizing power Compiled by G. Lebedev Editor N. Rogulich Tehred A. Kravch.uk Proofreader L. Patay Order 2268/22 Circulation 851 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5 Production and printing company, Uzhgorod, Projecto st., 4 Table 1 3.2 3.2 3.5 1.5 24 24 24 24 26 28 27 40 12988 15674 26666 1153 11.3 13.5 23.1 This method is based on the cleaning capacity of the facilities at the Volgodonsk Chemical Plant. Tavlitsa2 treatment facilities, treatment with mutagen is subjected to a pre-concentrated population of the original activated sludge. 2. The method of claim 1, wherein the mutagen is subjected to a pre-concentrated population of the original activated sludge to a suspension concentration of 10-50 g / l.