SU1175877A1 - Method of multistep biochemical treating of sewage - Google Patents

Abstract

one . METHOD OF SHOWING EXPOSURE BIOCHEMICAL CLEANING OF WASTE WATER aerobic cultivation of yeast r. Candida and mushroom r. Trichosporon at certain flow rates, characterized in that, in order to increase the degree of purification and increase the specific oxidative capacity, the purification is carried out in three steps, by aerobic cultivation of the yeast p. Candida and mushroom r. At the first stage of the second stage, Trichosporon is cleaned with activated at elevated temperatures, activated species, the species composition of which is represented by circular infusoria Vooticella convollaria, Epistylis plicatilis, and at the third stage - by active sludge under continuous seeding with its pure Second Level culture 2. 2. At the third stage 1, characterized in that aerobic cultivation is carried out by yeast and fungi in the amount of 70-60 and 30-40%, respectively, with a specific speed of photocurrent 0.2-0.6, air supply 40-50. H, at pH 4 (L 5 and 39 +. 3. Method by paragraphs I and 2, distinguishing so that purification in the second stage is carried out with active sludge with a specific flow rate of 0.2-1.0, pH 5-7. 4. The method according to claim 1-3, characterized in that the purification is eaten in the third stage carried out with a 00 specific flow rate of 0.1 m 0.3 h, air supply 10-20 m / m h pH 7-8.

Description

The invention relates to the biochemical treatment of wastewater, chemical-. Coal, hydrolysis, food and pulp and paper industry, namely, the biochemical purification of the brew, 5 obtained after growing yeast on the hydrolysates of plant raw materials and their mixture with the alcohol-containing vinous bard.

The aim of the invention is to increase the degree of purification and increase the specific oxidative power.

The method is carried out as follows.

Sewage water - after-flotation PDB with BOD, od, up to 20 g / l, not containing antifoam agent, is fed to the first purification stage in a yeast-growing apparatus with an elevation from Istema air diffusion with a specific rate of pro current of 0.2-0 0.2-0, 6 hours, depending on the concentration of contaminants, with an air supply of 40-50 m / m h, where cleaning is carried out with a mixture of yeast-like fungus of the genus Trichosporon (70-60%) and yeasts of the genus Candida (30-40%) at C and pH 4.0-5.0, The resulting biomass from the first stage of purification is floated, separated and dried together with the yeast of the main production ,thirty

After the first cleaning stage, after separating it from the biomass, the mashine enters the second cleaning stage in a yeast plant with an air-lift air distribution system; 35 here also comes a post-separation brew, containing an antifoam agent with a total specific flow rate of 0.2-1.0 hours, depending on the concentration of contaminants, where cleaning is carried out with activated sludge with a predominantly round-sprung Vozicella convicaria Episf.ylis plicatilis at. and pH of 5.0-7.0.

The culture fluid from the second 45 stage, which simultaneously serves as an active sludge generator, goes to the third stage tertiary treatment - bio-oxygenated plant with arbottage air distribution and a built-in settling basin. 50 The cultivation of active or lead with a specific flow rate of 0.1-0.3 h, pH 7, 0-8.0, with air supply 1020 h. Excess activated sludge is continuously separated in the built-in $ 5 settler and is used in the hydrolysis cycle yeast production. Wastewater treated to the standards required by SNiP 11-32-74 is drained to the sewage system or used in the main production.

PRI me R 1. Purification subjected waste water - afterburning baraju (PDB). The PDB obtained after yeast extraction on the hydrolysates of vegetable raw materials in mixture with the molasses distillery stillage is divided into two streams: post-flotation, non-defoaming, and post-separation (after the yeast has been concentrated on separators), content defoamer. This PDB is a waste of hydrolyzed-dart production and the main polluter of wastewater.

For the PDB purification process, two chamber air-lift aroute fermenter-bio-oxidizer with a capacity of 30 liters each and a working volume of 10 liters with a raised air distribution system, two medium selections and one bio-oxidizer with bubbling air distribution and a built-in sump of 50 liters and with a working volume of 50 liters and with a working volume of 50 liters and with a working volume of 50 liters and with a working volume of 50 liters and with a working volume of 50 liters.

Post-flotation PDB with. 8 g / l and pH 4-4.5 are served without dilution into the biooxidizer of the first purification stage at a flow rate of 4 l / h with a temperature of 39 +, which corresponds to a specific flow rate of 0.4 h and thus achieves the purification effect with a mixture of cultures of Trichosporon cutaneum (70-60%) and Candida scottii (30-40%) by. 43%. Grown biomass is selected according to the upper selection in the amount of 1 l / h.

After separation PDB (2 l / h) is mixed with PDB (З l / h 1 from the lower selection of the first stage bio-oxidant and is fed to the second-stage bio-oxidant, where further utilization of organic substances from microorganisms active or with the prevalence of protozoa Vooticel1 convallaria, Epistylis plicatilis with a specific flow rate of 0.5 and a temperature of 39 + 1 ° C achieved a cleaning effect on BOD, up to 71.5%.

Activated sludge from municipal sewage treatment plants, the microflora of which at 27 ° C is diverse, is taken as the starting point for cultivation at the second stage. With a gradual increase in the temperature of the process of growing activated sludge on PDB to 3839 C, some of the organisms disappear, its species composition becomes monotonous with the prevalence, mainly of round-craw Vuztiella convollariaj Epistylis plicatili i, with the help of such silt, the PDB purification effect is 71.5% of the CPD. After the second stage, the culture liquid flows to the third stage, where it is cleaned with active sludge at 39 ± ° C and a specific flow rate of 0.17, while achieving a purification effect of 98-99% after fellKfjgy Residual BOD, after the third stage 0.02 g / l . Excessive activated sludge produced in the process of biological purification of PDB is selected for its use in hydrolysis, yeast production. The performance of the bio-oxidant in comparison with the prototype is shown in Table 1. Example 2. Waste water is treated - the post-yeast brew according to the scheme described in equipment I. Example I. EUKfiof contaminated with contaminants 15 / g enters the first bio-oxidizer steps with a specific flow rate of 0.28 h, where it is cleaned with a mixture of Trichosporon, cutaneum (70%) and Candida scottii (30%) cultures by 45%. In the bio-oxidation of the third stage, the PDB is fed from a specific flow rate of 0.33 hours, where it is purified by an additional 72% of activated sludge. In the third stage biooxidant, the PDB is fed at a specific flow rate of 0.14, where it is cleaned with an adapted active force by 99%. Data on the work of bio-oxidants are given in table. 2. And p and m e. R 3. Waste water is subjected to purification - a post-yeast brew according to the scheme and on the equipment described in examples 1 and 2. PDB contaminated with BOD 20 g / l, as can be seen from the table. 3, enters the first stage of purification with a specific flow rate of 0.22 h, where it is cleaned with a mixture of cultures of Trichosporon cutaneum (70%) and Candidar scottii (30%) according to BSH by 48%. At the second stage, the PDB is cleaned with an adapted active of another 75% with a specific flow rate of 0.25 h. The tfa of the third step is cleared with 99% of the adapted active sludge with a specific flow rate of 0.12 h. The data on the work of bio-oxidants is given in Table. 3. Table 1

BPKdd, incoming 1ChB,

under .. G / l

BOD ", outgoing PDB,

half g / l

Working volume, l

Specific flow rate, h

Air consumption, l / l.h Temperature PDB, ° С РН

I The specific oxidative power, kg / m, days

4.56

0.0:

1.3

0.02 0.02

1,3

0.02

thirty

ten

0.06

4 0.5

0.5

0.17 20 39 + 1 50

39j: i4,5-6-6-7

1.5

5.2 39

5 0.03-4-5

Ttichosporon and

Candida ai ai

Cleaning efficiency

43 at.

Process indicators I stage 1 I stage 2

 incoming PDB, g / l BPKdtsd output DDB g / l volume, l Specific flow rate,

Air flow,

о Temperature PDB, С

pH

Specific oxidative capacity, kg / m "day

The working concentration of the micro-or - - 1 ganisms, g / l and, p.

Culture

BOD cleaning efficiency

The continuation of the table.1 0.5

AI

AI

98-99 98-99

75 71.5

table 2

3 step

2.3

8.25

0.02

2.3

thirty

ten

0.14

0.33

20

50

3911

6.0-7.0

4,5-7,0

,five

6.5

50 4-5

Trichosporon

AI

and Candida AI

99

72

Claims (4)

1. METHOD OF MULTI-STAGE BIOCHEMICAL WASTE TREATMENT of post-yeast brew, including aerobic cultivation of yeast ' R. Candida and fungi p. Trichosporon at certain flow rates, characterized in that, in order to increase the degree of purification and increase the specific oxidative power, the purification is carried out in three stages, performing aerobic cultivation of yeast p. Candida and fungi p, Trichosporon in the first stage, in the second stage, they are cleaned with activated sludge adapted to elevated temperatures, the species composition of which is represented by round-ciliated infusoria Vooticella convollaria, Epistylis plicatilis steps4 2. The method of pop. 1, characterized in that the aerobic cultivation is carried out by yeast and mushrooms in an amount of 70-60 and 30-40Z, respectively, with a specific flow rate of 0.2-0.6 air supply of 40-50 m ^e / m ³ .h, at a pH of 45 and 39 + 1 ° C. 3. The method according to PP. 1 and 2, characterized in that the purification in the second step is carried out asset nym sludge with a specific flow rate of 0.2-1.0 h ^'1, pH 5-7. 4. The method according to PP. 1-3, characterized in that the cleaning in the third stage is carried out with a specific flow rate of 0.1- _? 0.3 h '\ 10-20 m air supply ^? / m h pH 7-8. SU <, „1175877>