SU958328A1 - Method for purifying effluents from animal breeding complexes - Google Patents

Description

(54) METHOD FOR CLEANING WASTE WATER

Livestock Complexes The invention relates to methods for the treatment of wastewater from livestock breeding complexes and can be used to clean the wastewater of farms for growing and fattening industrial and young cattle. Wastewater from livestock farms is formed as a result of life. livestock, as well as cleaning of industrial premises by means of hydraulic washing. These drains are very specific and are characterized by the content of components, g / l: urea 46OO; nitrogen compounds 2.40; organic matter COD 46 50O; suspended solids 7.6 and hydrogen sulfide 116.0. Sewage staining by optical density 3, the number of microorganisms .- 6 cells / l. The known method of biological purification of slurry using activated sludge 1. The disadvantage of this method is the complexity of the technological scheme of wastewater treatment plants, including a three-stage cleaning in aeration tanks. - septic tanks, silt floaters, stockpiles and floor flvtratraosh. The presence of three sedimentation tanks leads to the contamination of a significant area of the surrounding space with an infectious microflora and the formation of hydrogen sulfide as a result of the rotting process. Half of all wastewater treatment, after cleaning on the floor of the filtration, contains a significant amount of organic (cleaning compared to the original COD at 6O%) and suspended solids (cleaning at 5O%). These pollution have a negative effect on the ecology of the environment, especially in humid climates, where evaporation is difficult. The closest to the technical essence and the achieved result to the invention is the method of sewage treatment, which means that after separation of coarse mechanical impurities, wastewater is subjected to electrical treatment in a uniform electric field with a voltage of 7 - 30 V / cm, followed by 39583 sewage treatment in biological ponds in which the bacteria BaciPEUS rnuci oainosus (strain E-19) are introduced first in a volume ratio of 5. 1OO-10 100 to waste water and in 2-3 days the Black Sea microalga PPdtanionas viridisB its volume ratio to waste water e 5 10010-100. As a result of wastewater treatment, they reduce the content of suspended. substances by 98.8%, hydrogen sulfide by 100%, organic substances in terms of COD by 98%. urea by 8.2%, nitrogenous compounds by 86%, the number of microorganisms is reduced by a factor of 100, and the pigmentation in optical units becomes O, ZG23. The disadvantages of this method are incomplete treatment of wastewater from urea and other nitrogenous compounds, as well as insufficient reduction of pigmentation of wastewaters and significant residual bacterial contamination. Incomplete utilization of urea and other nitrogenous compounds leads to their accumulation in wastewater, which excludes the use of treated wastewater for flushing out - recycled water supply, and in the case of discharge of treated wastewater into the reservoir - to a negative impact on the environment. The aim of the invention is to increase the degree of purification of wastewater of livestock farms from urea and nitrogenous compounds while reducing their pigmentation and bacterial contamination of wastewater. The goal is achieved by the fact that according to the proposed method of purification of wastewater from livestock farms, include the separation of coarse mechanical impurities, before electrotreatment in a uniform electric field at a intensity of 7–30 V / cm, the bacteria Proteus vuCcjaris are fed and cleaned in microalgae biological ponds mi vuPcjotris Beijershtam 342-1, introduced in volume ratio to waste water (10-15); 10O, followed by chlorination of purified water. The introduction of bacteria before the treatment of effluent in an electric field accelerates the purification and improves its performance, which seems to be due to the enhancement of physiological functions under the action of the electric field on bacteria, causing the organo-megaloalgous compounds to activate the morninggrowth ammonium nitrogen, and 4 hydrogen. At the same time, the content of hydrogen sulfide is reduced to such an extent that further purification of the currents with the help of freshwater micro Pt -nH is possible. Proteus vuPtg-aris bacteria are cultured on solid nutrient media (io-peptone agar with 0.2% glucose) for 24 hours. Bacterial concentration 5:20 mg / ml,. CtiPoreCed vuE fciris eijer microalgae (strain 342-1) is cultivated on a mineral medium. The concentration of microalgae is 1.7: 2.1 "Utslet", the introduction of the chlorination stage of the effluent after cleaning allows both to completely infect the effluent and use it in the circulating water supply for the hydraulic system. Wastewater treatment is carried out in containers in the light at 20 ° C. The growth of bacteria is judged by the formation of a film, and the cleaning by clarification of the liquid and the formation of a precipitate at the bottom of the tank. Algae growth is judged by increasing the intensity of green color. The cleaning effect is determined by the content of urea in the supernatant, total nitrogen, suspended substances, oxygen, hydrogen sulfide, COD organic substances, as well as measuring the optical density of the treated effluent, determined the total number of microorganisms in 1 ml of the purified effluent. Example 1, Stocks of livestock complexes in a volume of 1 l, which have passed the separation of coarse mechanical impurities containing, mg / l: urea 460O; total nitrogen 240O; suspended substances 76OO, organic substances according to COD 46540; hydrogen sulfide 116; O oxygen, transparency O with a strong odor, pigmentation in optical units 3, the number of microorganisms in 1 ml - 6-10 cells, placed in containers, 50 ml of bacteria Proteus vuP g-aris (volume ratio 5 1OO) are added and carried out immediately electric treatment in a uniform electric field with a voltage of 15 V / cm and a time of 5 min. The material of the electrodes: the cathode is stainless steel (1 v 18N9T), the anode is aluminum. On the 3rd day of the experiment, 100 mg (10: 1OO) of freshwater microalgae; ChCorePPa VU (jqri5 Beijer (strain 342-1)) is added. On the 10th day of the production, a clear interface between the liquid and the sediment is formed.

liquid chlorine. The transparency of the solution on the nephelometer 93, the oxygen content of 4.8 mg / l, hydrogen sulfide Oh, urea 12, other nitrogenous compounds 14 mg / l suspended solids COD 240 mg / l, the smell in the sample is completely absent. Stock pigmentation in optical units 0.16. The number of microorganisms i 10O cells in 1 l.

PRI mme R 2. Same as in Example 1, but the intensity of the floor during electrical treatment is 7 V / cm. The transparency of the solution according to a nephelometer is 89, the oxygen content is 4.6 mg / l, hydrogen sulfide is O, urea is 19 mg / l, other nitrogenous compounds are 17 mg / l, suspended substances by COD are 268 mg /, the smell is completely absent in the sample. Stock pigmentation in optical units 0.17. The number of microorganisms i 1OO cells in 1 l. Example 3. Same as in example 1, but the intensity of the floor when electro-treated is 30 V / cm, the transparency of the solution according to a nephelometer is 91, the content of components, mg / l: oxygen 5.0; hydrogen sulfide O; urea 1O; other nitrogen compounds 12.0; suspended solids; 135; organic matter COD 231 mgOl / l. The smell in the sample is completely absent. Stock pigmentation in optical units 0.15. The number of microorganisms 10 cells in 1 l. Example 4. Same as above in Example 1, but 70 ml (7. 10 O) bacteria and 15 O ml (15: 10 O) microalgae are added to a container with waste water. A clear boundary between liquid and sediment is formed on the eighth day of the experiment. The transparency of the solution on the nephelometer 93, the content of components, mg / l: oxygen 5,2; hydrogen sulfide O; urea 8; other nitrogen compounds 10; weighted things 123; organic matter COD 218 mg. The smell in the sample is COMPLETELY: absent1. Stock pigmentation in optical units 0.16. The number of microorganisms 1OO cells in 1l.

Example 5. Same as in Example 1, but microalgae are introduced on the fifth day of the experiment. As a result of the treatment on the seventh day, a clear boundary is formed between the liquid and the sediment. The transparency of the solution according to a nephelometer 95, the content of components, mg / l: urea Q nitrogenous compounds 1O, oxygen 5.0; hydrogen sulfide O; weighted items 154; Organic substances on hGTK 154 mg. The smell in the sample is completely absent. Stock pigmentation in optical units 0.13. The number of microorganisms 1OO cells in 1l. Comparison of wastewater treatment results using the proposed “and known methods are presented in the table. Thus, as a result of purification by the proposed method, the content of urea, other nitrogen-containing compounds and hydrogen sulfide is reduced by almost 1OO%. At the same time, the content of organic substances decreases by almost 100%, suspended substances by 93.4%, Pigmentation decreases by 2.5 times compared to the prototype, and the number of microorganisms does not exceed sanitary norms, which allows the use of treated wastewater water supply for flushing.

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Claims (2)

Invention Formula The wastewater treatment method of livestock farms, including the separation of coarse mechanical impurities, elect-5, followed by chlorination of the robo-processing in a uniform electric field at a intensity of 7–30 V / cm, biological treatment using bacteria and microalgae that, in order to increase the degree of wastewater purification from mozhevina and other nitrogenous compounds while reducing their pigmentation and bacterial contamination, before electrotreatment the bacteria are introduced into the wastewater and Proteus VuB (yar-is and aftertreatment is carried out in biopogic | X ponds with microalgae Ctioreeea voEqfar s Beijer - strain 342-1 in bulk with waste water (lO - 15): 100 Sources of information taken into account during examination 1 Proposals for trimming and using manure at a complex for growing and fattening young cattle for 2,000 heads in the Pashsky State Farm. NIPTIMESH, L. Pushkin, 2. USSR author's certificate in application number 2901837, cl. C 02 C 5/10, 198O ..