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CN-121974518-A - Simple substance phosphorus oxidation recovery method for phosphorus-containing wastewater

CN121974518ACN 121974518 ACN121974518 ACN 121974518ACN-121974518-A

Abstract

The application discloses an elemental phosphorus oxidation recovery method for phosphorus-containing wastewater, belongs to the field of pollutant treatment, and aims to solve the problems of high density and difficult oxidation of elemental phosphorus in the elemental phosphorus wastewater treatment process. The application breaks through the limitation that the traditional simple substance phosphorus wastewater only focuses on pollution treatment, successfully realizes the dual targets of 'pollution depth treatment' and 'phosphorus resource closed-loop recovery', and has both environmental benefit and economic benefit. The application adopts the grading treatment logic of 'temporary storage oxidation pond (simple substance phosphorus oxidation) →dephosphorization sedimentation pond (preliminary dephosphorization) →refined dephosphorization sedimentation pond (deep dephosphorization)', and is matched with the tail end purification of a sand filter, thereby not only ensuring the efficient oxidation of simple substance phosphorus (solving the problem that the sediment is difficult to contact air), but also controlling the phosphate of the outlet water at an extremely low level, and finally the outlet water of the reuse pond can be directly reused. The application not only improves the utilization rate of water resources, but also reduces the consumption cost of fresh water, and gives consideration to the treatment efficiency and the recycling value.

Inventors

  • XU DAIHONG
  • YU GANG
  • Wu Tangwen
  • PENG LIANG
  • YANG YUE

Assignees

  • 绵阳启明星磷化工有限公司

Dates

Publication Date
20260505
Application Date
20260205

Claims (9)

  1. 1. The simple substance phosphorus oxidation recovery method for the phosphorus-containing wastewater is characterized by comprising the following steps of: (1) Feeding the wastewater containing the elemental phosphorus into a temporary storage oxidation pond, introducing air for aeration, and adding an oxidant into the temporary storage oxidation pond to quickly oxidize the elemental phosphorus in the wastewater containing the elemental phosphorus, thereby obtaining first treated wastewater; (2) Feeding the first treated wastewater into a coarse phosphorus removal sedimentation tank, regulating the pH value of the first treated wastewater to 9-10, then adding calcium chloride into the coarse phosphorus removal sedimentation tank to generate phosphate sediment, and recording the effluent of the coarse phosphorus removal sedimentation tank as second treated wastewater; (3) Feeding the second treated wastewater into a refined phosphorus removal sedimentation tank, respectively adding a phosphorus removal agent and a flocculating agent into the refined phosphorus removal sedimentation tank, carrying out phosphorus removal and flocculation sedimentation treatment, and respectively obtaining third sludge and third treated water; (4) Sending the third treated water into a sand filter for filtering treatment, obtaining fourth treated water, and recycling the fourth treated water; (5) Sending the third sludge in the sludge pond to a sludge dehydrator for dehydration treatment, and adding a dehydrating agent into the third sludge while carrying out dehydration treatment to obtain fifth dry sludge; (6) Mixing the fifth dry mud with the rotary drum ash, and then pelletizing to obtain a sixth spherical material; (7) The sixth spherical material is adopted to replace part of phosphate ore, and the sixth spherical material, phosphate ore, coke and silica are sent into an electric furnace according to a set proportion to produce yellow phosphorus.
  2. 2. The method according to claim 1, wherein in the step (1), the wastewater containing the elemental phosphorus is sent into a temporary storage oxidation tank, a micro-nano aeration disc is arranged at the bottom of the temporary storage oxidation tank, oxygen is introduced into the micro-nano aeration disc, and the wastewater containing the elemental phosphorus is subjected to aeration treatment.
  3. 3. The method according to claim 2, wherein in the step (1), the oxygen content of the wastewater in the temporary oxidation pond is measured by an on-line dissolved oxygen meter.
  4. 4. A method according to any one of claims 1 to 3, wherein in the step (1), the oxidizing agent added to the temporary oxidation pond is sodium hypochlorite.
  5. 5. The method according to claim 1, wherein in the step (2), calcium phosphate precipitate is formed, and the formed calcium phosphate is recycled.
  6. 6. The method according to claim 1, wherein in the step (4), a sand filter medium is provided in the sand filter, and the third treated water is fed into the sand filter to be filtered, and the fourth treated water is obtained.
  7. 7. The method according to any one of claims 1 to 6, wherein in the step (4), the fourth treated water is used in a cooling or flushing process to realize recycling of water resources.
  8. 8. The method of claim 1, wherein in step (6), the drum ash is produced after the phosphorus sludge is recovered by drum steaming.
  9. 9. The method according to any one of claims 1 to 8, wherein in the step (7), phosphate ore, coke and silica are used as raw materials, the raw materials are fed into an electric furnace to produce yellow phosphorus, and in the process of producing yellow phosphorus, a part of phosphate ore is replaced by a sixth spherical material, so that the sixth spherical material is recycled.

Description

Simple substance phosphorus oxidation recovery method for phosphorus-containing wastewater Technical Field The application relates to the field of pollutant treatment, in particular to a simple substance phosphorus oxidation recovery method for phosphorus-containing wastewater. More specifically, the application provides the simple substance phosphorus wastewater for simple substance phosphorus wastewater, which can effectively realize deep pollution treatment and closed-loop recovery of phosphorus resources and has environmental benefit and economic benefit. Background The simple substance phosphorus wastewater (wherein the simple substance phosphorus is mainly yellow phosphorus P 4) is a characteristic pollutant in phosphorus chemical production (such as yellow phosphorus smelting and phosphide synthesis), has the characteristics of strong toxicity, flammability, difficult degradation and the like, and forms a serious threat to ecological environment and human health. After the elemental phosphorus enters the water body, the elemental phosphorus can be deposited at the water bottom (the density of the elemental phosphorus is about 1.6 g/cm 3 and is larger than that of water), and the toxicity is slowly released for a long time, so that aquatic organisms are influenced, and the aquatic organisms are enriched through a food chain, so that the human health is finally endangered. Meanwhile, the simple substance phosphorus is easy to spontaneously ignite (self-ignition point is 30 ℃), combustion accidents can be caused in the wastewater treatment process, and potential safety hazards exist. If the water is not effectively treated and directly discharged, water eutrophication can be caused, blue algae burst is initiated, and water resource utilization is seriously affected. Currently, aiming at the wastewater containing the simple substance phosphorus, the core of removing the simple substance phosphorus is mainly surrounded, and common treatment methods comprise a physical separation method, a single chemical oxidation method, an oxidation-precipitation combination method, a membrane separation strengthening method and the like. However, existing treatment methods have certain drawbacks. For example, aiming at simple substance phosphorus wastewater, a physical separation method mainly adopts a precipitation and air floatation separation mode to deposit phosphorus, but only 60% -80% of large-particle phosphorus (> 10 mu m) can be removed, the fine particle removal rate is less than 30%, hazardous waste disposal is needed for sludge, a single chemical oxidation method mainly adopts sodium hypochlorite for oxidation, but the oxidation rate is only 50% -70% due to insufficient contact, the sodium hypochlorite addition amount is about 20 times of the mass of phosphorus, the cost is higher, an oxidation-precipitation combination method mainly adopts a mode of combining air aeration and calcium salt precipitation, but air bubbles are difficult to reach the water bottom, the oxidation reaction needs 24-48 hours, the calcium phosphate sludge utilization rate is 0, the treatment cost is high, a membrane separation strengthening method adopts a mode of high-pressure interception filtration after oxidation, but the system recovery rate is only 50% -70%, the production of 30% -50% of concentrated water needs to be reprocessed, and the membrane replacement cost is about 40% of operation cost and is higher. The existing simple substance phosphorus wastewater treatment method generally has the problems that the contact of an oxidant is insufficient, the oxidation efficiency is low, the consumption of a medicament is high, and oxidized products are not recycled, so that the vicious circle of pollution control, waste production and pollution control of the simple substance phosphorus wastewater is formed. For this reason, a new method and/or apparatus is urgently needed to solve the above-mentioned problems. Disclosure of Invention The application aims to provide an oxidation recovery method of elemental phosphorus for phosphorus-containing wastewater, aiming at the problems of high density and difficult oxidation of the elemental phosphorus in the process of treating the elemental phosphorus wastewater. The application breaks through the limitation that the traditional simple substance phosphorus wastewater only focuses on pollution treatment, successfully realizes the dual targets of 'pollution depth treatment' and 'phosphorus resource closed-loop recovery', and has both environmental benefit and economic benefit. In order to achieve the above purpose, the present application adopts the following technical scheme: a simple substance phosphorus oxidation recovery method for phosphorus-containing wastewater comprises the following steps: (1) Feeding the wastewater containing the elemental phosphorus into a temporary storage oxidation pond, introducing air for aeration, and adding an oxidant into the temporary storage oxidation