SU842052A1 - Method of active silt treatment - Google Patents

Description

1 The invention relates to methods for treating wastewater from various industries of the food and microbiological industry, as well as to methods for disinfecting sludge resulting from biological treatment of wastewater. Biological treatment used to treat wastewater} 4 waters containing significant amounts of protein substances does not always meet sanitary requirements, as a result of which the sludge contains the remaining protein and organic impurities. On contact with air, the process of rotting of the remaining protein proceeds with the formation of hydrogen sulphide. In humid climatic conditions, there is no intense evaporation of water from the sludge plots, which makes it necessary to occupy large areas for storing sludge. This in turn leads to contamination of the ecological basin. In order to reduce the area occupied by activated sludge, they are used with dehydration events. In particular, a method of dewatering activated sludge by a mechanical method is known, for example by evacuating G1 J. There is also a known method of dewatering sludge using chemical reagents, flocculent B 2. There is also a known replacement method in biological treatment of waste sludge from activated sludge with various volts i, such as chlorococcal, blue-green, diatom, etc. f 3}. This method also does not solve the problem of complete disinfection of activated sludge. The use of such methods allows only to reduce the indicators of chemical oxygen consumption (COD) and biochemical oxygen consumption (TLC) in wastewater, however, after purification, the complete separation of microorganisms from wastewater is not achieved. Some of the cultivated microorganisms enter the final reservoir with effluents and cause an outbreak of life in the wastewater zone, as well as salinization of the discharge site and its biological contamination. In addition, a method is known for deactivating activated sludge by dewatering it with centrifugals. With subsequent application of a Fougat into the soil using a hydroborer and heat treatment of the resulting cake T4.

The disadvantage of this method is that it can only be used in enterprises with a small amount of wastewater, as well as pollution of groundwater, in addition, expensive equipment is used and high electricity costs are used for drying wet sludge. The use of this method of disposal of activated sludge during the treatment of wastewater from the food and microbiological industry is not possible due to the specificity of the wastewater from these industries, but primarily Neschichi in the wastewater of protein substances and the associated (belks1m) hydrogen sulfide.

Closest to the proposed technical essence and the achieved result is a method of neutralizing activated sludge by treating it with calcium chloride. The resulting activated sludge from biological treatment of wastewater from the protein-vitamin concentrate enters the sludge chambers of the secondary sedimentation tanks, from there .- to the active sludge tanks, and then is pumped to the sludge compactors. The sludge is compacted and it is chlorinated. From the sludge compactor, activated sludge with a moisture content of 99.6% is released onto the sludge floor Csj.

The disadvantage of this method is that calcium chloride does not purify Hl from hydrogen sulphide, therefore only partial disinfection of activated sludge occurs. In addition, this method leads to an increase in the salt content of sludge by increasing the concentration of the -chloride ion.

The purpose of the invention is to increase the degree of purification of activated sludge from hydrogen sulfide and the elimination of areas for sludge floors.

The objective is achieved by introducing the bacteria Bacillus mucMaglnosus into active sludge and treatment is carried out in ponds followed by the introduction of the Black Sea microalga Piatymonos viridis.

Preferably, the Bacillus bacterium (VagiVag) nosus and the Black Sea micro-EODOro, CUL Piatymonos viridis should be administered in a volume ratio of 1.21, 3: 100 silt, moreover, it is preferable to introduce the Black Sea microalga into the pond 5-6 days after the introduction of the bacterium Bacillus mucilaglnosus.

The choice of ratios 1.2: 100-1.3: 100 was made according to the technical and economic efficiency indicator, determined by the ratio of the costs of growing the culture to the operating costs of the sewage treatment plant. Piatymonos viridis microalgae is isolated from: Black Sea water and cultured on Goldberg medium as modified by Kabakova. The concentration of microalgae is 2, 68-3.35-10 cells per ml. Bacillus muci1aqinosus bacteria are cultured on solid nutrient media. The bacterial washes with saline were adjusted to a concentration of 10 units. turbidity, which corresponds to 2.6-3.510® cells per ml.

The Black Sea Alga has the ability to multiply in wastewaters containing significant amounts of hydrogen sulphide and adapt to low salinity. When using the symbiosis of Piatymonos viridis with the soil bacterium Bacillus mucilaginosus, the hydrolyzing effect on the waste of the powerful enzymatic system of the bacterium is enhanced. The biocenosis of marine microalgae and soil bacteria is formed in biological ponds, in which waste (silt), which has undergone preliminary biological treatment, is concentrated. Treated in this way, the sludge enters the freshwater reservoir. At the same time, the temporary biocenosis of algae and bacteria disintegrates. Algae in fresh water, upon dying off, form detritus, which is naturally mineralized by biosystems that purify this body of water. Soil bacteria Bacillus mucilaginosus form in fresh water in adverse conditions of support, germinating only in the case of them. fall into the soil.

The use of other algae and bacteria for the disposal of activated sludge does not lead to a positive effect, since the hydrogen sulfide contained in the sludge is an inhibitor of cell division of most of the microorganisms in the sludge fields.

The model is sludge from sludge fields of a biochemical plant. The test of microalgae and bacteria for their ability to multiply is carried out in containers in the light when. The growth of bacteria is judged by the formation of a film and the turbidity of the liquid, and the purification of a liquid by the clarification of the liquid and the formation of a precipitate at the bottom of the tank. The growth of algae is judged by increasing the intensity of green color. The cleaning effect is determined by the transparency of the water column above the precipitate and the formation of a clear interface.

In the supernatant, the fluid U is determined: T is hydrogen sulfide and oxygen.

P p and p 1. In 1.0 l of activated sludge, formed as a result of biological treatment and containing 1200 mg / hydrogen sulfide, with transparency O and oxygen content O, 12.0 ml (1.2: 100) of the bacterium lacIMus muc P hell i nosus. On the fifth

On the experimental day, 12.0 ml (1.2: 100) of Platymonos V i g i d i S microalgae was added. On the eighth day of the experiment, a clear interface forms between the liquid and the sediment. The transparency of the solution according to the nephelometer is 98.0, the hydrogen sulfide content is 9.1 mg / l, and the oxygen content is 6.7 mg / l.

Example2. As in example 1, but microalgae are added to the staves of the day of the experiment. The formation of a clear boundary between the liquid and the sediment is observed on the ninth day of the experiment. The transparency of the solution on nephelome. Tru -, the content of hydrogen sulfide - 8.9 mg / l, oxygen 6, 8 mg / l.

Example 3. Same as in example 1, but in 1.0 l of activated sludge, 13.0 ml (1.3: 100) of bacteria and 13.0 ml (1.3: 100) of microalgae are introduced. The transparency of the solution is 100, the hydrogen sulfide content is 8.5 mg / l, and the oxygen content is 6.7.

Thus, the disposal of sludge resulting from biological treatment of food and microbiological wastewater can be carried out by biocenosis of marine microalgae Platymonos viridis with the soil bacterium Bacill usmucilaqinosus in biological ponds. The use of the symbiosis of these microalgae and bacteria makes it possible to intensify the process of sludge neutralization and reduce the amount of hydrogen sulfide from 1200 mg / l to 9 mg / l, i.e. 130 times. The symbiosis of these microalgae and bacteria also improves the sanitary and hygienic indicators of purified sludge and wastewater that is drained into biological ponds, supports the continuous processing of organic substances, Beka and hydrogen sulfide, and creates the possibility of safe disposal of them into the natural reservoir, i.e. completely excluded silt floor, and therefore.

cleaning of the air and water basin is carried out.

Claims (4)

Invention Formula i. The method of treatment of activated sludge after the biological purification of protein-containing wastewater, and with the aim of increasing the degree of purification of activated sludge. from hydrogen sulphide to eliminate plots under sludge floors, bacteria Bacillus mucilagtnosus is injected into active sludge and treatment is carried out in ponds followed by the introduction of the Black Sea microalgae Platymonos viridis. I 2. The method according to claim 1, in which the bacteria Bacillus muc ilag 4 nosus and the Black Sea Piatymonos viridis bacteria are introduced in a volume ratio of 1.2-1.3: 100 3. The method of PP, 1 and 2, about the t of l and the fact that the Black Sea microalga is introduced into the pond through 5-6 days after introduction of Bacillus mucilaainosus into the sludge. Sources of information taken into account in the examination 1. KusLev Yu. I., Gordeev Yu. A. and others. Pulp, paper and cardboard. 1977, p. 11-12. 2. Effluent and water Treat, 1973, 13, 2, p. 77. 5, 3. Protsenko, D.F., et al. Collection of Referential Information on Scientific Research and Educational Work in Universities of the Ukrainian SSR. BIOLOGY, Kiev, 1978, issue 12. with. 24.. 0 4. USSR author's certificate number 341759, cl. From 02 to 3/00, 1972. 5 Technological regulations of the Kirishi Biochemical Plant. Requisite code 5021678, - 1976 (prototype).