Method for deeply removing phosphorus by mineral packed column

A technology of packed columns and minerals, used in chemical instruments and methods, water pollutants, multi-stage treatment of water/sewage, etc., can solve the problems of low electrodialysis and reverse osmosis efficiency, difficult to achieve stable total phosphorus standards, and high cost. , to achieve the effect of realizing solid waste recycling, convenient local material acquisition, and low cost

Pending Publication Date: 2020-10-30
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult for the total phosphorus in the effluent treated by the biological phosphorus removal process to reach the standard stably, and it is difficult to reduce the total phosphorus in the effluent to below 1mg/L with a simple biological method
The ion exchange method uses various types of ion exchange resins to remove phosphate in water. Although the removal effect for low-concentration phosphorus is obvious, the cost is high and the operation is complicated.
Microfiltration, reverse osmosis and electrodialysis are the most common physical phosphorus removal technologies at present.

Method used

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  • Method for deeply removing phosphorus by mineral packed column
  • Method for deeply removing phosphorus by mineral packed column
  • Method for deeply removing phosphorus by mineral packed column

Examples

Experimental program
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Effect test

Example Embodiment

[0032] Example 1Fe 2+ To PO 4 -P removal enhancement

[0033] 1. Put 100mg CaCO 3 Particles added to Fe 2+ 100mL FeSO with a concentration of 200mg / L 4 The solution was stirred for 240 minutes by a magnetic stirrer at 500 rpm. Using scanning electron microscope to observe the change characteristics of particle morphology before and after the action, the result is figure 1 Shown. figure 2 -A means CaCO 3 The original morphology of the particles is a typical hexagonal crystal structure with complete morphology. After Fe 2+ After the action, its appearance is like figure 2 -B shows that most of CaCO 3 The particles have been dissociated into small and irregular particles, which proves that Fe 2+ For CaCO 3 It has obvious corrosive effect. Therefore, it can be inferred that in the solution, Fe 2+ Can significantly promote CaCO 3 Middle Ca 2+ Dissolution.

[0034] 2. Use CaCO 3 The particle-packed filter column processes the same batch of PO 4 -P water sample, explore the enhancement ...

Example Embodiment

[0037] Example 2 A method for deep dephosphorization of mineral packed column

[0038] Pack the calcite particles into the cuboid column, the calcite filler size distribution (weight ratio): 3 PO 4 ) Configured to a P concentration of 0.5mg / L to be treated liquid 10L, and adjust the pH to 7.0. A 2L beaker is used as a pretreatment tank, control Fe / P=1, add 0.016mM ferrous sulfate to each liter of phosphorus-containing samples (FeSO 4 ), the magnetic stirring speed is 100 rpm, and after the stirring is even, the solution in the beaker is transferred from the bottom of the filter column into the column with a peristaltic pump, and the flow rate is controlled to maintain the hydraulic residence time in the column at 10 min. Sampling was taken at the outlet of the upper part of the filter column every 12 hours to detect the total Fe and total P content in the sample. The results showed that the pH of the water was stable at 7.4, and the concentration of Fe in the effluent was always l...

Example Embodiment

[0039] Example 3 A method for deep dephosphorization of mineral packed column

[0040] Fill the limestone particles into the cuboid column, the distribution of limestone filler size (weight ratio): 3 PO 4 ) Is configured to contain P concentration of 3mg / L to be treated liquid 10L, and adjust the pH to 7.0. 2L beaker is used as a pretreatment tank, control Fe / P=1, add 0.097mM iron nitrate (Fe (NO 3 ) 3 ), the magnetic stirring speed is 100 rpm, and after the stirring is uniform, the solution in the beaker is transported from the bottom of the filter column into the column with a peristaltic pump, and the flow rate is controlled to maintain the hydraulic retention time in the column at 30 min. Sampling was taken at the outlet of the upper part of the filter column every 12 hours to test the total Fe and total P content in the sample. After running for 7 consecutive days, the result showed that the water pH was stable at 7.1, the Fe concentration was lower than 0.01 mg / L, and the P ...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for deeply removing phosphorus by using a column structure process of a calcareous mineral-iron ion coupling enhancer. According to the method, phosphorus-containing sewage pretreated by an iron ion enhancer is introduced from one side of a calcareous mineral filter column and is discharged from the other side of the filter column after staying, so that low-concentration phosphorus in the sewage is efficiently removed. According to the method, few iron ions are used as strengthening ions,a natural calcareous mineral is adopted as a filter material, and the physical and chemical effects among calcareous particles, iron ions and phosphate radicals are brought into full play, so that the phosphorus removal effect is enhanced by more than ten times, the P effluent concentration is controlled to be 0.1 mg/L or below, the iron ions are also fixed in the column body and cannot be left in water to be discharged, and secondary pollution to the environment is avoided.

Description

Technical field: [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for deep phosphorus removal using a column structure process of a calcareous mineral-iron ion coupling enhancer. Background technique: [0002] With the increase of human activities, the pollution of phosphorus in the water body is becoming more and more serious. A large amount of phosphorus-containing domestic sewage and industrial wastewater are discharged into lakes, rivers and other water bodies, which increases the nutrients in the water body and causes the abnormal reproduction of algae and aquatic plants in the water body. Eutrophication. At present, my country's "Pollutant Discharge Standards for Urban Sewage Treatment Plants" has a first-level standard, a second-level standard and a third-level standard, respectively specifying that the maximum allowable discharge concentration of total phosphorus is 0.5-1mg / L, 3mg / L and 5mg / L. Studie...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10
CPCC02F9/00C02F1/58C02F1/001C02F1/281C02F2101/105
Inventor 赵旭李学伟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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