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Equipment and treatment process for removing phosphorus from anaerobic digestion wastewater by using solid wastes

An anaerobic digestion and solid waste technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. Unstable phosphorus removal effect, difficult nitrogen and phosphorus removal effect, etc., to achieve the effect of facilitating treatment and resource utilization, improving phosphorus removal effect, and reducing phosphorus removal cost

Pending Publication Date: 2022-04-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] with A 2 In contrast to the O method, chemical phosphorus removal mainly uses phosphorus removal agents, such as: calcium hydroxide, ferric chloride, etc.; currently A 2 The combined use of O method and chemical phosphorus removal scheme exists in the whole process: (1) A variety of microorganisms, including nitrifying bacteria, denitrifying bacteria and phosphorus accumulating bacteria, etc., these microorganisms participate in various complicated processes, and various factors interact with each other The inherent defects of checks and balances make the effect of nitrogen and phosphorus removal unstable and difficult to improve; (2) There is a competitive relationship between bacterial species, A 2 O process has a carbon source competition relationship, which makes it difficult to improve the nitrogen and phosphorus removal effect of the system; (3) there is a contradiction between phosphorus accumulating bacteria and nitrifying bacteria in the sludge residence time, and it is difficult to ensure the nitrogen and phosphorus removal effect ; (4) except A 2 In addition to the O method, the disadvantages of chemical phosphorus removal are that the phosphorus removal agent is expensive, the dosage is large, and the cost is high. These are the problems that A 2 Technical Defects Existing in the Combination of O Method and Chemical Phosphorus Removal

Method used

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  • Equipment and treatment process for removing phosphorus from anaerobic digestion wastewater by using solid wastes
  • Equipment and treatment process for removing phosphorus from anaerobic digestion wastewater by using solid wastes
  • Equipment and treatment process for removing phosphorus from anaerobic digestion wastewater by using solid wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Utilize described equipment to carry out the process of anaerobic digestion waste water dephosphorization, concrete method is:

[0062] Organic waste enters into the centrifugal dehydrator 6 under the action of the centrifugal feeding pump 8, and at the same time, the solution in the flocculant mixing tank 9 is discharged into the centrifugal dehydrator under the action of the metering pump 10. In the dehydrator 6, after being mixed in the centrifugal dehydrator 6, the solid-liquid separation is carried out through dehydration treatment, and the high-phosphorus wastewater enters into the lime concentration mixing tank 2 under the action of the water pump 7;

[0063] The lime located in the lime storage bin 12 enters into the lime settling chamber 11 under the action of the lime powder screw feeder 13, and undergoes settling treatment to obtain settled lime; the settled lime is fed into the lime Under the action of the device 14, it enters the lime digestion tank 1 to re...

Embodiment 2

[0067] The preparation steps are the same as in Example 1, except that the calcium ratio of desulfurized gypsum and calcium hydroxide is replaced from 20mmol / L:40mmol / L to 40mmol / L:40mmol / L.

Embodiment 3

[0069] Utilize described equipment to carry out the process of anaerobic digestion waste water dephosphorization, concrete method is:

[0070] Organic waste enters into the centrifugal dehydrator 6 under the action of the centrifugal feeding pump 8, and at the same time, the solution in the flocculant mixing tank 9 is discharged into the centrifugal dehydrator under the action of the metering pump 10. In the dehydrator 6, after being mixed in the centrifugal dehydrator 6, the solid-liquid separation is carried out through dehydration treatment, and the high-phosphorus wastewater enters into the lime concentration mixing tank 2 under the action of the water pump 7;

[0071] In the lime concentration mixing tank 2, desulfurization gypsum and high-phosphorus wastewater are mixed and reacted first, and then ferric chloride is added and reacted to obtain a mixture; the quality of the desulfurization gypsum, the quality of the ferric chloride and the The volume ratio of high phospho...

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Abstract

The invention relates to the technical field of wastewater treatment equipment, in particular to equipment for removing phosphorus from anaerobic digestion wastewater by using solid wastes and a treatment process. The equipment comprises a lime slaking tank used for reacting and dissolving lime, and an anaerobic digestion tank used for carrying out anaerobic digestion on the solid waste to remove phosphorus from the wastewater, the lime centralized mixing tank is used for mixing the high-phosphorus wastewater, desulfurized gypsum and lime; the desulfurized lime sedimentation tank is used for carrying out calcium sedimentation treatment; filter pressing equipment is arranged between the tower pump buffer tank and the desulfurization lime sedimentation tank, and the tower pump buffer tank is used for storing dephosphorizing waste liquid subjected to filter pressing; and the ammonia water pump is used for discharging the dephosphorization waste liquid and is arranged on the tower pump buffer tank in a penetrating manner. The desulfurization gypsum is compounded with the traditional phosphorus removal agent calcium hydroxide, so that the phosphorus removal effect of the wastewater is improved, and safe discharge of the wastewater is ensured; in addition, secondary utilization of the desulfurized gypsum is also realized, the dephosphorization cost is greatly reduced, and meanwhile, the treatment problem of the desulfurized gypsum is favorably and properly solved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment equipment, and in particular relates to equipment and a treatment process for anaerobic digestion waste water dephosphorization by using solid waste. Background technique [0002] Anaerobic digestion is an important method for organic waste management and renewable energy production, and the difficult treatment of anaerobic digestion biogas slurry is one of the bottlenecks in the scale development of the industry, and the disposal of biogas slurry is a common problem in the industry. At present, the ideal way to dispose of biogas slurry is to return it to the field as fertilizer, but excessive phosphorus in biogas slurry will cause phosphorus loss and eutrophication of water body. The biogas slurry that cannot be returned to the field may need to be treated to meet the discharge standards. It needs to be separated from solids and liquids, and then chemical or biological phosphorus re...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52C02F101/10
Inventor 徐芙清陈锐梁嘉威马鸿祯
Owner XI AN JIAOTONG UNIV