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CN-121974505-A - Inorganic phosphorus recovery method aiming at traditional secondary sedimentation tank water outlet depending on biological phosphorus removal filler

CN121974505ACN 121974505 ACN121974505 ACN 121974505ACN-121974505-A

Abstract

An inorganic phosphorus recovery method aiming at a traditional secondary sedimentation tank water outlet depending on biological phosphorus removal filler belongs to the fields of pollution control, low carbon and resource regeneration. The biological phosphorus removal treatment unit comprises a first biological phosphorus removal filler pool, a second biological phosphorus removal filler pool and a sedimentation pool, the phosphorus enrichment and recovery treatment unit comprises a phosphorus-rich water storage pool and a chemical phosphorus recovery pool, the residual sludge phosphorus recovery unit comprises an anaerobic phosphorus release pool, a sludge concentration pool and a sludge dewatering workshop, and the characteristics of phosphorus release by phosphorus accumulating bacteria in an anaerobic state and phosphorus absorption under an aerobic condition are fully utilized, so that the invalid phosphorus circulation in the sewage treatment process is reduced, the phosphorus in the sewage is efficiently removed, and the phosphorus is enriched into the phosphorus-rich water storage pool, and the recycling of the phosphorus in the sewage is facilitated. The biological active filler of special functional flora is manufactured by adopting a microorganism immobilization technology to treat sewage, so that the running stability of the system is obviously enhanced, and the dephosphorization efficiency is greatly improved.

Inventors

  • YANG HONG

Assignees

  • 杨宏

Dates

Publication Date
20260505
Application Date
20251202

Claims (9)

  1. 1. The inorganic phosphorus recovery device is characterized by comprising a biological phosphorus removal treatment unit, a phosphorus enrichment recovery treatment unit and a surplus sludge phosphorus recovery unit, wherein the biological phosphorus removal treatment unit comprises a first biological phosphorus removal filler pool (2), a second biological phosphorus removal filler pool (3) and a sedimentation tank (4), the phosphorus enrichment recovery treatment unit comprises a phosphorus-rich water storage pool (5) and a chemical phosphorus recovery pool (6), and the surplus sludge phosphorus recovery unit comprises an anaerobic phosphorus release pool (7), a sludge concentration pool (8) and a sludge dewatering workshop (9); The number of the biological dephosphorization filler pools is at least 2, namely, the first biological dephosphorization filler pool (2) and the second biological dephosphorization filler pool (3) can be increased appropriately according to actual demands so as to adapt to different application scenes, a plurality of biological dephosphorization filler pools are arranged in parallel and used for alternately working, and each biological dephosphorization filler pool is filled with high-efficiency dephosphorization embedded biological active fillers; each biological dephosphorization filler pool is connected with a water inlet oxygenation system and an organic carbon source adding system through valves, wherein the water inlet oxygenation system comprises a blower (25), and the organic carbon source adding system comprises a static mixer (51), an organic carbon source adding pipe (52) and a phosphorus-rich water pump (53); The connection relation and parallel connection alternate work of the first biological phosphorus removal filler pool (2) and the second biological phosphorus removal filler pool (3) are used for explanation, and the phosphorus-containing effluent of the secondary sedimentation pool (1) is respectively connected with the first biological phosphorus removal filler pool (2) and the second biological phosphorus removal filler pool (3) through valves; the first biological phosphorus removal filler pool (2) and the second biological phosphorus removal filler pool (3) are respectively connected with the sedimentation pool (4) through valves, a sludge outlet at the bottom of the sedimentation pool (4) is connected with the sludge concentration pool (8) through valves, meanwhile, the first biological phosphorus removal filler pool (2) and the second biological phosphorus removal filler pool (3) are respectively provided with a phosphorus-rich water gap with valves, the phosphorus-rich water gap is divided into two branches, one branch is connected with the phosphorus-rich water storage pool (5) through the valves, the other branch is sequentially connected with the phosphorus-rich water storage pool (5) through the valves, the static mixer (51), the organic carbon source adding pipe (52) and the phosphorus-rich water pump (53), the phosphorus-rich water storage pool (5) is connected with the chemical phosphorus recovery pool (6), the chemical phosphorus recovery pool (6) is provided with a phosphorus removal chemical agent adding pipe (61), a phosphorus removal stirrer (62) and a spiral lifter (63), the bottom of the chemical phosphorus recovery pool (6) is in a conical structure, the lower end of the spiral lifter (63) is positioned in the conical structure, the other end of the spiral lifter (63) extends upwards to the chemical recovery pool (6), the other end of the spiral elevator (63) is provided with a downward extending phosphorus recovery product collecting pipe (66) which is connected with the phosphorus recovery tank (64); the sludge outlet at the bottom of the secondary sedimentation tank (1) is connected with an anaerobic phosphorus release tank (7) through a valve, the anaerobic phosphorus release tank (7) is provided with an organic carbon source feeding pipe (71) and a second stirrer (72), the anaerobic phosphorus release tank (7) is connected with a sludge concentration tank (8), the supernatant outlet of the sludge concentration tank (8) is connected with a chemical phosphorus recovery tank (6) and is conveyed into the chemical phosphorus recovery tank (6), meanwhile, the sludge outlet of the sludge concentration tank (8) is connected with a sludge dewatering workshop (9), and the dewatered supernatant of the sludge dewatering workshop (9) is connected with the chemical phosphorus recovery tank (6) and is conveyed into the chemical phosphorus recovery tank (6).
  2. 2. The inorganic phosphorus recovery device for the traditional secondary sedimentation tank water outlet supported biological phosphorus removal filler according to claim 1, wherein the efficient phosphorus removal embedded biological active filler is prepared by fixing a cultured phosphorus accumulating bacterial colony in a filler carrier in an embedded mode by a microorganism immobilization technology.
  3. 3. A method for inorganic phosphorus recovery using the apparatus of claim 1 or 2, comprising the steps of: (1) Biological phosphorus removal moiety After the effluent of the secondary sedimentation tank (1) is subjected to main flow mud-water separation, the effluent hardly contains activated sludge; the effluent of the secondary sedimentation tank (1) is effluent which is not subjected to dephosphorization treatment, and enters a first biological dephosphorization filler tank (2) or a second biological dephosphorization filler tank (3), the biological active filler in the tank is in an empty tank state after the phosphorus release process is completed, the effluent of the secondary sedimentation tank (1) flows into the first biological dephosphorization filler tank (2) or the second biological dephosphorization filler tank (3), the sequencing batch biological dephosphorization process is carried out under the aerobic aeration condition, the water after each dephosphorization enters a sedimentation tank (4), the first biological dephosphorization filler tank (2) or the second biological dephosphorization filler tank (3) continuously enters water and water along with the sequencing batch, the biological active filler in the tank can continuously absorb phosphorus to reach a saturated state, at the moment, the effluent of the secondary sedimentation tank (1) is adjusted to the corresponding second biological dephosphorization filler tank (3) or the first biological dephosphorization filler tank (2) or the second biological dephosphorization filler tank (3), the first biological dephosphorization filler tank (2) or the second biological dephosphorization filler tank (3) which reaches phosphorus saturation is filled into the sedimentation tank (3) along with the sequencing batch, the biological dephosphorization filler tank (3) is filled with the biological dephosphorization filler (5) simultaneously, the biological dephosphorization filler (2) is filled in the biological dephosphorization filler tank (2) at the same time, the biological dephosphorization filler (2) is filled in the biological dephosphorization filler tank is filled in the sedimentation tank, and the biological dephosphorization filler (3) is filled in the water, and the biological dephosphorization filler tank is filled in the water, and the water is filled in the water, the process is characterized in that the anaerobic phosphorus release of the bioactive filler is carried out, high-concentration phosphorus-rich water with higher relative concentration (relative to the phosphorus-rich water just entering) is formed, and after the phosphorus release is complete, all the pond water of the first biological phosphorus removal filler pond (2) or the second biological phosphorus removal filler pond (3) is discharged into a phosphorus-rich water storage pond (5) for storage, so that the primary biological phosphorus removal process is completed; The first biological phosphorus removal filler pool (2) or the second biological phosphorus removal filler pool (3) is ready to enter the biological phosphorus removal process of the next round, and the first biological phosphorus removal filler pool (2) and the second biological phosphorus removal filler pool (3) are subjected to the alternate biological phosphorus removal process; (2) Phosphorus recovery section The phosphorus-rich water collected in the phosphorus-rich water storage tank (5) gradually increases the phosphorus concentration after repeated phosphorus release circulation, when the phosphorus concentration in the phosphorus-rich water storage tank (5) is accumulated to reach a preset level, the phosphorus is introduced into the chemical phosphorus recovery tank (6), chemical phosphorus removal agent is added into the chemical phosphorus recovery tank (6) through a phosphorus removal chemical agent adding pipe (61) and is fully stirred by a stirrer (62) to promote the chemical phosphorus removal reaction, after the reaction is finished, stirring is stopped to naturally settle the precipitate, the precipitated chemical phosphorus precipitate is cleaned and separated through a spiral lifter (63), so that pure recovered phosphorus is obtained, and the phosphorus recovery products are stored in the phosphorus recovery tank (64); (3) Excess sludge phosphorus recovery section In the main process of sewage treatment, the surplus sludge generated by a secondary sedimentation tank (1) is conveyed to an anaerobic phosphorus release tank (7), an organic carbon source is added into the anaerobic phosphorus release tank (7) through an organic carbon source adding pipe (71), and is fully stirred by a stirrer (72), so that phosphorus in the sludge is fully released, the sludge after phosphorus release and the precipitated sludge generated by a precipitation tank (4) are discharged to a sludge concentration tank (8) together for concentration, the concentrated sludge is conveyed to a sludge dehydration workshop (9) for dehydration, the dehydrated sludge is transported to the outside for treatment, and concentrated supernatant obtained in the sludge concentration tank (8) and sludge dehydration liquid obtained in the sludge dehydration workshop (9) flow into a chemical phosphorus recovery tank (6) together for chemical phosphorus recovery.
  4. 4. A method according to claim 3, wherein in operation, DO under anaerobic conditions is controlled below 0.2mg/L, DO under aerobic conditions is greater than 2mg/L, and anaerobic and aerobic hydraulic retention times are both greater than 40 minutes.
  5. 5. A method according to claim 3, characterized in that the sedimentation tank (4) collects and sedimentates the effluent after the dephosphorization treatment in the first biological dephosphorization filler tank (2) and the second biological dephosphorization filler tank (3), the supernatant after sedimentation is discharged as final effluent after dephosphorization, and the sedimentated sludge is conveyed to the sludge concentration tank (8) for sludge concentration.
  6. 6. A method according to claim 3, characterized in that the phosphorus-rich water storage pool (5) is used for storing phosphorus-rich water after anaerobic phosphorus release of the first biological phosphorus removal filler pool (2) or the second biological phosphorus removal filler pool (3).
  7. 7. The method according to claim 3, wherein the chemical phosphorus recovery tank (6) is provided with a chemical agent feeding pipe (61), a stirrer (62), a spiral lifting machine (63) and a phosphorus recovery product collecting tank (64), wherein the chemical agent feeding is selected from calcium salt, ferric salt, magnesium salt and the like, preferably calcium salt, the pH value is controlled within the range of 8-11 during the phosphorus recovery reaction of the chemical phosphorus recovery tank (6), the reaction time is not less than 10 minutes, and the precipitation time is not less than 30 minutes.
  8. 8. The method according to claim 3, characterized in that the water content of the sludge after concentration in the sludge concentration tank (8) is not more than 97%, the sludge is introduced into the sludge dewatering workshop (9), the removed water is introduced into the chemical phosphorus recovery tank (6) for phosphorus recovery, the hydraulic retention time in the sludge concentration tank (8) is 10-16 h, and the effective water depth is generally 4m.
  9. 9. A method according to claim 3, characterized in that the sludge dewatering plant (9) dewaters the concentrated sludge, separates out water, the water content of the dewatered sludge is generally 60% -80%, the sludge is convenient for the next step of outward transportation and treatment, and the dewatered sewage is led into the chemical phosphorus recovery tank (6) for phosphorus recovery.

Description

Inorganic phosphorus recovery method aiming at traditional secondary sedimentation tank water outlet depending on biological phosphorus removal filler Technical Field The invention belongs to the field of water pollution control, low carbon and resource regeneration, and particularly relates to an inorganic phosphorus recovery technology aiming at a traditional secondary sedimentation tank effluent depending on biological phosphorus removal filler. Background In sewage treatment, phosphorus removal is of paramount importance. The excessive existence of phosphorus can cause eutrophication of water body, which leads to algae propagation and destroys ecological balance. Excessive exploitation of phosphorite, large-scale use of phosphate fertilizer and random discharge of phosphorus-containing sewage lead to high concentration of phosphorus in the sewage, and the phosphorus recycling technology is imperfect, so that phosphorus resources become more precious and scarce. Therefore, the effective sewage treatment and phosphorus recovery technology has important significance for protecting water resources, maintaining ecological balance and recycling phosphorus resources. The domestic sewage contains a large amount of phosphorus, and the main purpose of dephosphorization in the field of domestic sewage treatment is to ensure eutrophication control of the discharged water body. The phosphorus removal in sewage treatment technology is mainly achieved by two technical methods of biology and inorganic chemistry. The biological phosphorus removal utilizes the characteristic of phosphorus accumulating bacteria, namely the phosphorus accumulating bacteria release phosphorus into a liquid phase by utilizing an organic carbon source under the anaerobic condition, and the phosphorus accumulating bacteria can excessively absorb the phosphorus in the liquid phase to remove the phosphorus in sewage under the aerobic condition, and the phosphorus accumulating bacteria realize the removal of the phosphorus through the difference between the release and the absorption. However, in the existing phosphorus removal process, the phosphorus is not effective to circulate, namely phosphorus in sewage is absorbed by phosphorus accumulating bacteria in an aerobic way, phosphorus released by an anaerobic section is required to be absorbed together, a large amount of organic matters are consumed, the biological phosphorus removal process is complex, sludge is required to react alternately in an anaerobic state and an aerobic state, the phosphorus concentration in the finally treated effluent is difficult to be ensured to be maintained at a lower level in the traditional sewage treatment process, and the phosphorus removal in a sewage treatment plant is also required to be assisted by chemical phosphorus removal. The chemical dephosphorization technology utilizes the reaction of chemical agent and inorganic phosphorus in water to form indissoluble inorganic phosphorus-containing matter. These indissolvable substances are settled together with the activated sludge by a sedimentation tank, thereby realizing the removal of phosphorus in water. The phosphorus-containing sludge, whether obtained by biological or chemical phosphorus removal, is eventually mixed with excess sludge and treated by an excess sludge discharge system. This treatment results in all of the removed phosphorus being mixed in the sludge and difficult to recycle and utilize separately. Thus, while these methods are effective in removing phosphorus from wastewater, the recovery of phosphorus still presents certain challenges. In recent years, with the increasing awareness of non-renewable phosphorus resources, people begin to pay attention to recycling of phosphorus, and mainly adopt a technical method of drying and incinerating residual sludge containing phosphorus and recycling phosphorus elements by treating inorganic ash, but the method can cause that the recycled phosphorus is polluted by harmful substances such as heavy metals in the residual sludge, thereby negatively affecting the environment and soil. Biological dephosphorization is carried out by an activated sludge method, and is easily influenced by natural climate change, so that the activity of flora in a system is reduced, and the sewage treatment effect is influenced. In addition, a large amount of polysaccharide bacteria exist in the activated sludge, and the bacteria can compete with the phosphorus accumulating bacteria for organic carbon sources, so that the phosphorus accumulating bacteria have low abundance, and the phosphorus removing effect is affected. In order to solve the problems, the invention uses a microorganism immobilization technology to immobilize the cultured phosphorus accumulating bacteria in a filler carrier in an embedding way, and uses the biological phosphorus removing filler to carry out sewage phosphorus removal treatment. The biological phosphorus removal filler has the advantages of