SU1460045A1 - Method of biological purification of waste water of non-ionogenic surfactants - Google Patents

Description

The invention relates to microbial treatment of industrial wastewater and can be used for the purification of wastewaters of fine organic synthesis enterprises. . The purpose of the invention is to reduce the cleaning time and the possibility of wastewater treatment from highly destructive non-ionic surfactants.

The method is carried out as follows.

The cleaning is carried out in a continuous-flow installation consisting, for example, of 40 cylindrical containers connected in series, in which

 2

fiberglass is incorporated as a carrier of microorganisms. Cumulative culture of anaerobic microorganisms derived from fermented sediment. Preparation of the fermented sediment is carried out by temperature treatment at 80-90 ° C for 5-10 minutes in the presence of a water-insoluble carrier and water-polluting organic substances, in order to eliminate non-specific microflora and preferential development of special microorganisms of the fermented sediment — destructors of nonionic surfactants of various kinds chemical structure (ethoxylated alcohols, acids.

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ABOUT

about

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alkylphenols, block copolymers of ethylene and propylene oxides, polyhydroxy compounds) with a total concentration of 30 g / l.

The technological scheme allows creating conditions for the development of specific microorganisms on the site. In 1-3 tanks, microorganisms of the genera Bacillus and Pseudomonas develop, destroying mild nonionic surfactants in microaero-fgshnyh conditions, in 3-19 containers. - facultative anaerobes of nonionic surfactants, destroying denitrifying bacteria, further 19–35 containers — strict ana-grains — sulfate-reducing bacteria capable of destroying very hard nonionic surfactants, and, finally, methane-forming (35–40 capacity) bacteria. The totality of anaerobic microorganisms allows to ensure the dissolution: e 1s of nonionic surfactants of various chemical structure with an initial concentration of 30 g / l and their degradation products, resulting in a content of nonionic surfactants in such locally purified by the proposed method water will be 10-20 mg / This allows the water to be directed to general biological wastewater treatment plants with active sludge. The degree of cleaning for surfactant removal is 99.5-100%, the residence time of the flow in the structure is no more than 1-2 hours.

Example. The load on the structure - the content of nonionic surfactants (syntanrl DS-10, stearox 920, Triton X-100, Proxanol Shch1-3, EU Precella, PEG-115) in waste water 30 g / l, CODbichr 47000 mg Oj / l, The initial concentration of the fermented sludge in the first tank is 5 g / l. The fermented sludge is preliminarily heat treated at 80 ° C for 8 minutes in the presence of a mixture of nonionic surfactants at a total concentration of 30 g / l. The concentration of microorganisms in the aqueous phase in the construction of 10 cells / ml. Dwell time

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0

in the construction 2 hours. Cleaning is carried out in a continuous-flow installation under anaerobic conditions. Each of the 40 tanks has a volume of 225 liters. The degree of purification to remove organic pollutants is 99.5%.

The proposed intervals of the preliminary heat treatment mode are given in table 1.

The proposed boundary values of the temperature and heat treatment of the fermented sediment of 85-90 ° C for 5-10 minutes lead to 99-100% 5 destruction of organic pollutants in the wastewater. If the fermented sludge is treated for 3 or 15 minutes, i.e. below or above the proposed limit, the final results of purification deteriorate and the degree of purification is reduced to 75%. A similar picture is observed if the temperature treatment is increased at a temperature higher or lower than in the proposed limit. So, when processing at a temperature of 55 ° C, the destruction of nonionic surfactants occurs by only 40%, and at a temperature of 95 ° C - by only 10%.

Comparative data on the proposed and known methods are presented in table 2.

The proposed method allows to purify wastewater containing nonionic surfactants of different chemical structure (all chemical types of nonionic surfactants) and high initial concentrations of 30 g / l, with a high degree of purification, reaching 99.5-100%. It should be noted that the known method does not allow to purify these waste waters, but only a certain composition with an initial concentration of 6.5 g / l. In addition, the proposed method allows to reduce the treatment time of the drain by 12 times.

The rationale for the processing of microorganisms is presented in table. 3

five

0

five

0

five

Table 1

Fermented sediment

Nonionic surfactants in the treated water

The initial concentration of nonionic surfactants, g / l

CODbichr (initial), g Oj / l

Cleaning time, h Degree of cleaning,%

In the numerator - the degree of wastewater treatment from stearox-b, OS-20, hydropol-200, polyethylene glyx-35 at a concentration of 6.2 g / l, in the denominator - the degree of wastewater treatment, purified by the proposed method, but under conditions known .

Without heat treatment

Thermoprocessed

Sintanol DS-10, stearox 920, Triton X-100, Proxanol CP-3, EU Precelll, polyethylene glycol - 1 15%

thirty

47 1-2 99.97

Microbial processing sequence

Offered

Denitrifiers sulfate, - duktory- microaerofs, genus Bacillus and Pseudonranas methanogens

Sulfate reducers - denitrifiers - microaerophiles of the genera Bacillus and Pseudomonas methanogens

Methanogens - microaerophiles of the genera Bacillus and Pseudomonas Denitrifiers - - sulfate - reducers

T a b whether c a J

The concentration of the mixture of substances, g / l

initial

is finite

0.15

19.2

thirty

thirty

Claims (1)

1 . METHOD FOR BIOLOGICAL WASTE WATER TREATMENT FROM NON-IONOGENIC SURFACE-ACTIVE SUBSTANCES, including treatment with fermented sediment