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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. Their disadvantages are that on the one hand, the cost is too expensive, and on the other hand, the efficiency of electrodialysis and reverse osmosis is not high, generally only 10% can be removed total phosphorus
Lin Yunxia (Study on Chemical Precipitation Method for Treating Pesticide Phosphorus Wastewater[J]. Tianjin Chemical Industry, 2014, 28(01): 47-49) Adding polyaluminum chloride to pesticide phosphorus wastewater, when the pH is 8.5-9 , the total phosphorus dropped from 129mg / L to 5.16mg / L, the removal rate can reach 96%, but the effluent concentration is far greater than 0.2mg / L

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
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1Fe 2+ to PO 4 Enhancement by -P removal

[0033] 1. Mix 100mg CaCO 3 Particles added to Fe 2+ 100mL FeSO with a concentration of 200mg / L 4 solution, and stirred with a magnetic stirrer at a speed of 500 rpm for 240 minutes. Using a scanning electron microscope to observe the characteristics of particle morphology changes before and after the action, the results are as follows figure 1 shown. figure 2 -A means CaCO 3 The original morphology of the particles is a typical hexagonal crystal structure with regular and complete morphology. After Fe 2+ After the action, its appearance is as figure 2 -B, most CaCO 3 The particles have been dissociated into irregular fine particles, which proves that Fe 2+ to CaCO 3 has obvious corrosive effect, therefore, it can be deduced that in solution, Fe 2+ Can significantly promote CaCO 3 Medium Ca 2+ dissolution.

[0034] 2. Using CaCO 3 Particle packed filter column to treat the same batch containing PO 4 -...

Embodiment 2

[0037] Embodiment 2 A kind of method for the deep phosphorus removal of mineral packed column

[0038] Fill the calcite particles into the cuboid column, the calcite filler particle size distribution (weight ratio): 3 PO 4 ) is configured to contain P concentration and be 0.5mg / L to be treated liquid 10L, and adjust pH to be 7.0. The 2L beaker is used as the pretreatment pond, controls Fe / P=1, adds 0.016mM ferrous sulfate in the phosphorus-containing sample of every liter (FeSO 4 ), the magnetic stirring speed is 100rpm, after stirring evenly, the solution in the beaker is transported into the column from the bottom of the filter column with a peristaltic pump, and the flow rate is controlled to keep the hydraulic retention time in the column to be 10min. Samples were taken every 12 hours at the discharge port on the upper part of the filter column, and the total Fe and total P content in the sample was detected. After continuous operation for 7 days, the results showed that ...

Embodiment 3

[0039] Embodiment 3 A kind of method for the deep phosphorus removal of mineral packed column

[0040] Fill the limestone particles into the cuboid column, the particle size distribution of limestone filler (weight ratio): 3 PO 4 ) is configured to contain P concentration and be 3mg / L to be treated liquid 10L, and adjusting pH is 7.0. The 2L beaker is used as pretreatment pool, controls Fe / P=1, adds 0.097mM iron nitrate (Fe nitrate) in the phosphorus-containing sample of every liter (NO 3 ) 3 ), the magnetic stirring speed is 100rpm, after stirring evenly, the solution in the beaker is transported into the column body from the bottom of the filter column with a peristaltic pump, and the flow rate is controlled to keep the hydraulic retention time in the column body at 30min. Samples are taken every 12 hours at the outlet of the upper part of the filter column, and the total Fe and total P content in the sample is detected. After 7 days of continuous operation, the results sh...

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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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