SU1308566A1 - Method of processing sewage of cocoon reeling industry - Google Patents

Abstract

The invention relates to the treatment and reuse of industrial wastewater from silk-milling factories and can be used in the plumbing management of silk-processing enterprises. The aim of the invention is to increase the proteolytic activity of the treated water. The wastewater of coconomotal production is mixed with activated sludge and subsequently aerated in the cells of the cellular aerotechnical propellant; and disinfect. 1 tab. yu (L

Description

Of course, the introduction relates to the treatment and reuse of industrial wastewater from silk-milling factories and can be used in the plumbing management of silk-processing enterprises.

The aim of the invention is to increase the proteolytic activity of the treated water. ,

The method is carried out as follows.

At the local treatment facilities of silk-reel enterprises, the wastewater of coconomal production is mixed with active sludge and is subsequently aerated in the first and subsequent cells of the cellular aerotank-tester. Sludge mixture in the amount of 2-10% of the total flow rate is fed from the first cell to the last. The sludge mixture from the last cell of the aero-tank is directed to separation, for example, to secondary sedimentation tanks, where the purified water is separated from the activated sludge. Purified water is subjected to purification, for example, by filtration, and disinfection, for example, by ozonation. Treated wastewater with high proteolytic activity

YU

f5

20

25

27 u / l The treated water is recycled (: 1 is processed during cocoon processing. The specific consumption of cocoon raw material is 3.58 kg / kg of raw silk.

PRI mme R 2. The process is carried out analogously to example 1, but the sludge mixture from the first cell of the aerotank is fed to the latter in the amount of 6% 6 tons of the total consumption. The silt index is equal to 90 Secondary settling time 1.5 h. Filtration rate 10 m / h. Dose of ozone at 8 mg / l. Proteolytic activity in treated water is 36 U / L. The specific consumption of cocoon raw materials is 3.5 kg / kg of raw silk.

PRI me R 3. The process is carried out analogously to example 1, but the sludge mixture from the first cell of the aerotank is fed to the latter in the amount of 10% of the total consumption. Silt index 90. Secondary settling time 1.5 .h. Filtration rate 10 m / h. Ozone dose 8 mg / l. Proteolytic activity in treated water is 40 U / L. The specific consumption of cocoon raw materials is 3.45 kg / kg of raw silk.

PRI me R 4. The process is carried out analogously to example 1, but the sludge mixture from the first cell of the aerotank is fed to

27-40 u / l, again last in the amount of 1% of the total

used in the processing of cocoons, as a result, the specific consumption of cocoon raw material is reduced by 0.12-0.25 kg in the production of 1 kg of raw silk.

Example 1, Sewage water coconutal production with BPCp 320 mg / l with a flow rate of 250 is mixed with activated sludge. The concentration of activated sludge in a mixture is 2 g / l. The silt mixture is successively aerated in the cells of 4 cells of the aero jar propellant. From the first cell, the sludge mixture in the amount of 2% of the total consumption is fed to the last cell. The silt index is 90 cm- / g. The silt mixture from the last cell of the aerotank is fed to the secondary clarifiers, where the gravitational separation of purified water from the activated sludge takes place. The time of secondary settling is 1.5 hours. After the secondary settling, purified water undergoes tertiary treatment on frame-filling filters. Filtration rate 10 m / h. After filtration, water is disinfected by ozonation. Ozone dose 8 mg / l. Proteolytic activity in treated water

five

0

five

27 u / l The treated water is recycled (: 1 is processed during cocoon processing. The specific consumption of cocoon raw material is 3.58 kg / kg of raw silk.

PRI mme R 2. The process is carried out analogously to example 1, but the sludge mixture from the first cell of the aerotank is fed to the latter in the amount of 6% 6 tons of the total consumption. Silt index is 90. The secondary settling time is 1.5 hours. The filtration rate is 10 m / h. Ozone dose 8 mg / l. Proteolytic activity in treated water is 36 U / L. The specific consumption of cocoon raw materials is 3.5 kg / kg of raw silk.

PRI me R 3. The process is carried out analogously to example 1, but the sludge mixture from the first cell of the aerotank is fed to the latter in the amount of 10% of the total consumption. Silt index 90. Time of secondary settling 1,5 .h. Filtration speed 10 m / h. Ozone dose 8 mg / l. Proteolytic activity in treated water is 40 U / L. The specific consumption of cocoon raw materials is 3.45 kg / kg of raw silk.

PRI me R 4. The process is carried out analogously to example 1, but the sludge mixture from the first cell of the aerotank is fed to

expense. Silt index 90. The secondary settling time is 1.5 hours. The filtration rate is 10 m / h. Ozone dose 8 mg / l. Proteolytic activity 35 in treated water 5 u / l. The consumption of cocoon raw materials is 3.7 kg / kg of raw silk.

PR and meR 5. The process is carried out analogously to Example 1, but the sludge mixture and the first cell of the aeration tank are fed to the last in the amount of 15% of the total consumption. Silt index 121. The time of secondary settling is 2 hours. The filtration rate is 7 m / h. Ozone dose of 10 mg / l. Proteolytic activity in treated water is 18 U / L. The specific consumption of cocoon raw materials is 3.66 kg / kg of raw silk.

50 Comparative data are presented in the table.

When applying the sludge mixture from the first cell to the last one in an amount of less than 2% of the total consumption of proteolytic activity in treated water does not increase in comparison with the known method, and the specific consumption of cocoon raw material does not decrease. When feeding the sludge mixture from the first cell

in ps1s.11nee in a specific amount exceeding 10% of the total consumption, proteolytic activity in the treated water

Claims (1)

reduced, and the reduction in specific consumption of cocoon raw material is insignificant. This is due to the increase in the sludge index in aerotanks and, accordingly, the complication of the subsequent stages of water treatment, which leads to the destruction of the The method of treating sewage from coco-motile productions for their reuse in the processing of a significant part of the proteolithic cocoon cocoons, which includes mixing the waste enzymes in the treated water. In addition, the complication of the following stages after aeration in aeration tank is the inverse aeration of the mixture in the cells of a cell aeration displacer, separation of purified water from activated sludge, its fS after-treatment and decontamination, after all In order to increase the proteolytic activity of the treated water, the sludge mixture of the method used, as compared with the known amount of 2-10% of the total consumable, allows the proteolytic 20 to be increased and the aeration activity of the treated water is fed from the first cell and snitel last. water treatment leads to an increase in capital and operating costs for wastewater treatment. I Thus, the application of the pre-amount of the sludge mixture supplied from the first cell of the aerotank to the last cell, in% of the total consumption of the sludge mixture None (prototype method) 0.5 1.0 2.0 6.0 ten 13 15 20 18 eleven m -  3085 6b4 to reduce the specific consumption of definitive and expensive cocoon raw material in the production of raw silk. 5 claims inae Specific consumption of cocoon raw materials, kg / kg of raw silk Reducing the specific consumption of cocoon raw materials in comparison with the known method, kg / kg of raw silk 90 90 90 90 90 90 04 3.7 3.7 3.7 3.58 3.5 3.45 3.64 ABOUT ABOUT . ABOUT 0.12 0.2 0.25 0.06 3.66 3.68 0.04 0.02