Method of removing phosphorus from waste liquid

 

The invention relates to the field of urban wastewater and wastewater from food processing industries and cattle-breeding complexes and is designed to remove waste fluid phosphorus, presented in the form of ions RHO3-4. The method includes mechanical, biological treatment of waste liquid and physico-chemical treatment of sludge water with the consolidated return activated sludge depleted in phosphorus, from lopatnits in the aeration tank. Sludge water released from ions of phosphoric acid in the sump physico-chemical treatment and enriched volatile fatty acids produced in acidification working on raw sludge from the primary clarifiers in operation of the first stage of anaerobic digestion, is mixed with activated sludge from the secondary clarifiers and served in lopatriello. Effect: the high quality of waste liquid from phosphorus and reduced operating costs. 1 Il.

The invention relates to the field of urban wastewater and wastewater from food processing industries and cattle-breeding complexes and is designed to remove waste fluid phosphorus, presented in the form of ion the wastewater treatment containing phosphorus. The Gilbert Victor Levin (USA), George Jiri Topol (Canada), Alexander Gregor Carney (USA). M. CL.302 F 3/30. Publ. 30.11.80), including mechanical, biological treatment of waste liquid, physico-chemical treatment of sludge water in which the degree of release of phosphorus from the cells of microorganisms increases with increasing the residence time of activated sludge under anaerobic conditions.

The liquid waste goes through a primary settling tanks, aeration tanks, secondary clarifiers, is exempt from phosphorus and fed to further processing. Activated sludge from the secondary clarifiers is sent to lopatriello for its separation in anaerobic conditions into two fractions: silt water and thickened activated sludge. In lopatnitsa under anaerobic conditions is the release of phosphorus from microorganisms of activated sludge and enrichment of silt water. In the same building is the compaction of the sludge separation of sludge water. Sludge water with a high content of phosphates in the number of 75-25% of the daily flow of waste fluid is diverted from lopatnits on the physico-chemical treatment, where it entered the reagent most commonly used CA(Oh)2in combination with flocculants. CA(Oh)2serve the growth delayed in the pits physico-chemical treatment and then removed for subsequent use as a low grade fertilizer. Sludge water from the tanks physico-chemical treatment is returned again to repeat the cleaning. Concentrated activated sludge depleted in phosphorus, in the amount of 25-75% is returned to the aeration tank, where it absorbs phosphorus, cleansing, thus, the liquid waste from biogenic element. The efficiency of phosphorus removal from waste fluid depends on many factors, the main of which is the residence time of activated sludge under anaerobic conditions.

The disadvantage of this method is insufficiently high quality of waste liquid, a considerable amount of lopatnitsa and high capital costs required for their construction.

The closest to the essence and the achieved result claimed is a method of removing phosphorus from waste liquid (Zaletov N. A., Isaeva, N. In. Efficient processes for phosphorus removal from municipal wastewater. Proceedings of the Akha them. K. D. Panfilov, "Effective technological processes and equipment for wastewater treatment" M: jist the Akha, 1988, S. 36-37 - prototype), including mechanical, biological treatment of waste liquid and physico-chemical treatment of sludge water in which to increase the degree of liberation of f is according to this method, the liquid waste goes through a primary settling tanks, the aeration tanks, secondary clarifiers, is exempt from phosphorus and fed to further processing. Activated sludge from the secondary clarifiers is sent to lopatriello before which is injected sulfuric or acetic acid. In lopatnitsa under anaerobic conditions is the release of phosphorus from microorganisms of activated sludge and enrichment of silt water. In the same building is the compaction of the sludge separation of sludge water. Silt, water is diverted for physico-chemical treatment, providing for the introduction of reagents (CA(Oh)2and flocculant) to bind ions RHO3-4in a sparingly soluble compound, and then after carbonization is reset before primary sedimentation tanks for re-cleaning. Compacted silt depleted in phosphorus is returned to the biological treatment in the aeration tanks, where the replacement of lost them in lopatnitsa phosphorus.

According to this method, the effect of removing phosphorus from waste liquid is 90-97% for the duration of the seals 1-6,5 hours.

The disadvantages of the prototype are not high enough quality of waste liquid due to the pollution caused by waste liquid sulfur, the need for additional reagent is eskay task solved in the present method, is to improve the quality of the sewage liquid from phosphorus.

The technical problem is solved as follows. In the method of removing phosphorus from waste liquids, including mechanical, biological treatment of waste liquid and physico-chemical treatment of sludge water with the consolidated return activated sludge depleted in phosphorus, from lopatnits in the aeration tank, according to the invention the sludge water released from ions of phosphoric acid in the sump physico-chemical treatment and enriched volatile fatty acids produced in acidification working on raw sludge from the primary clarifiers in operation of the first stage (acid or hydrogen) anaerobic digestion, is mixed with activated sludge from the secondary clarifiers and served in lopatriello.

The liquid waste goes through a primary settling tanks, aeration tanks, secondary clarifiers, is exempt from phosphorus and fed to further processing. Activated sludge from the secondary clarifiers is sent to the mixer where it is mixed with the sludge water released from ions of phosphoric acid in the sump physico-chemical treatment and enriched AGV produced in acidification working at damp the e l e C where is the seal sludge separation of sludge water, which then goes on physico-chemical treatment, providing for the introduction of reagents for binding ions PO3-4in a sparingly soluble compound, and then after carbonization is reset before primary sedimentation tanks for re-cleaning. Compacted silt depleted in phosphorus is returned to the biological treatment in the aeration tanks, where the replacement of lost them in lopatnitsa phosphorus.

Through the use of to intensify the release of phosphorus from sludge microorganisms of water released from ions of phosphoric acid in the sump physico-chemical treatment and enriched AGV produced in acidification working on raw sludge from the primary clarifiers in operation of the first stage of anaerobic digestion, is high quality of waste liquid from phosphorus, and reduce operating costs.

The invention is illustrated in the drawing, which shows a flow chart of phosphorus removal from waste liquid.

Indicate on the drawing: 1 - primary sedimentation tank; 2 - aeration tank; 3 - secondary clarifier; 4 - lopatriello; 5 - mixer, 6 - sump physico-historycznego sump; 11 - compacted activated sludge depleted in ions RHO3-4; 12 recirculating activated sludge depleted in ions RHO3-4; 13 - excess activated sludge; 14 - sludge water, enriched ions RHO3-4; 15 - residue containing Ca5OH(RHO4)3and MgNH4PO46H2O; 16 - sludge water with a residual phosphorus content (0.1-0.5 mg/l); 17 - carbonated liquid with a pH of 8-8,5; 18 - raw sludge from the primary clarifiers; 19 - sludge water, ions released from RHO3-4in the sump of physico-chemical purification and enriched AGV produced in acidification working on raw sludge from the primary clarifiers in operation of the first stage of anaerobic digestion; 20 - the sediment that passed the first stage of anaerobic digestion; 21 - submission of CA(Oh)2; 22 - submission of flocculant; 23 - supply of carbon dioxide (purified flue gases from a local source); 24 - mixer, a 25 - residue containing iron hydroxide - production waste water treatment facilities in the preparation of groundwater for domestic needs; 26 - sump physico-chemical treatment; 27 - sludge from the clarifier physico-chemical treatment; 28 - sludge water, enriched ions RHO3-4and AGV produced in air traffic management, 29 - acidification.

The inventive method of phosphorus removal from waste liquids involves skipping a waste liquid through the primary clarifiers aeration tanks 1 and 2. The sludge mixture, after passing through the secondary clarifiers 3, is divided into two components: a biologically purified waste fluid 9 is supplied for further processing, and activated sludge 10, circulating and the excess is sent to the mixer 8, and then in lopatriello 4. The microorganisms of the activated sludge, while in anaerobic conditions, can release into the environment of the phosphorus in the form of ions RHO3-4. To intensify the process of releasing phosphorus, and hence reduce lopatnitsa, in the mixer 8 is introduced sludge water 19 of acidification 29, enriched AGV. The production of AGV in acidification occurs in the course of the first stage (acid or hydrogen) anaerobic digestion of raw sludge 18 coming from the primary clarifiers. Partially fermented and compacted sediment 20 of acidification is sent for further processing - thickening, stabilization, and dewatering. Compacted activated sludge depleted in ions of phosphorus 11 is unloaded from lopatnits. A big part 12 returns to aareceive to absorb phosphorus, and excess activated sludge 13 is removed for processing - thickening, stabilization and dehydration.

Because the sludge water in acidification enriched not only AGV, but ions RHO3-4to enhance the effect of removing phosphorus from the waste liquid in the sludge water from acidification 29 prior to being fed into the mixer 8 is introduced precipitate containing iron hydroxide - production waste water treatment facilities in the preparation of groundwater for domestic needs 25. Next, this mixture is directed into the sump physico-chemical treatment 26 in which there is deposition of crystals FO4and MgNH4PO46H2O. the Precipitated crystals 27 are removed from the sump. Exempt from ions RHO3-4but containing AGV sludge water 19 from the sump physico-chemical treatment (26) is sent to the mixer 8.

Sludge water 14 ions enriched RHO3-4in the mixer 5 is mixed with CA(Oh)221 and flocculant 22, for example VPK-402, Praestol, polyox, and is directed into the sump physico-chemical treatment 6, in which the deposition of crystals of CA5HE(RHO4)3and MgNH4PO46H2O. the Precipitated crystals 15 are removed from the sump and can use the in carbonization 7, where are supplied with carbon dioxide (purified flue gases from a local source) 23 to lower the pH to 8-8,5, and binding of CA2+with the formation of caso3. Carbonated liquid 17 is reset before primary sedimentation tanks for re-cleaning.

According to the claimed method the effect of removing phosphorus from the waste fluid is 92-98% when the degree of recirculation of activated sludge 1.0, time seal 1-5 hours and the pH of the compact recirculating activated sludge 6-7,5. Higher values correspond to greater effect the degree of compaction of silt (65% silt water, 35% of the compacted silt) and a higher concentration of activated sludge (9-12 g/l), loaded into lopatriello.

Thus, using the proposed method provides a high quality of waste fluid and reduced operating costs due to the mixing of activated sludge from the secondary clarifiers with sludge water released from ions of phosphoric acid in the sump physico-chemical treatment and enriched AGV produced in acidification working on raw sludge from the primary clarifiers in operation of the first stage of anaerobic digestion.

Claims

Method of removing phosphorus from the RL sludge water with the consolidated return activated sludge, depleted in phosphorus, from lopatnits in the aeration tank, characterized in that the sludge water released from ions of phosphoric acid in the sump physico-chemical treatment and enriched volatile fatty acids produced in acidification working on raw sludge from the primary clarifiers in operation of the first stage of anaerobic digestion, is mixed with activated sludge from the secondary clarifiers and served in lopatriello.

 

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