A process for removing phosphorus from industrial wastewater

A technology for industrial waste water and technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc. Significant phosphorus effect, low maintenance cost, and low wastewater treatment cost

Active Publication Date: 2011-12-14
MORITA NEW ENERGY MATERIALS ZHANGJIAGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid-base neutralization method is to add calcium hydroxide or calcium chloride and other calcium compounds to form a series of calcium salt precipitation such as calcium phosphate and other calcium salts in wastewater to achieve the purpose of phosphorus removal. However, due to the diversity of phosphoric acid in aqueous solution (different P exists in different forms at pH) and the corresponding solubility problems of a series of calcium phosphate salts lead to the limitation of this process; the treatment effect of RO reverse osmosis membrane method is very good, but the high cost of equipment installation and maintenance makes this process difficult to use promotion in large scale production

Method used

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  • A process for removing phosphorus from industrial wastewater
  • A process for removing phosphorus from industrial wastewater
  • A process for removing phosphorus from industrial wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The basic properties of wastewater are as follows: (phosphorus content 100~1000ppm, pH 4.2)

[0017] Specific steps are as follows:

[0018] The first step: Take three parts of 0.5 liters of waste water, add sulfuric acid solution to adjust the pH value of the solution to 1.0, 2.0, and 3.0 respectively, stir well and add calcium hydroxide solid powder to it several times until the pH value of the solution is neutral. Table 1 has provided the change data of waste water pH along with calcium hydroxide solid powder addition; figure 1 The trend chart of wastewater pH with the addition of calcium hydroxide solid powder is given.

[0019] Table 1 The change data of wastewater pH with the addition of calcium hydroxide

[0020]

[0021] The second step: centrifugal separation, analysis of phosphorus content in the filtrate, the results are shown in Table 2.

[0022] Table 2

[0023]

[0024] It can be seen from the above chart that the change trend of ...

Embodiment 2

[0027] Before treatment, the basic properties of wastewater are as follows: (phosphorus content 100~1000ppm, pH 4.6)

[0028] Add sulfuric acid solution to 8 cubic meters of the above-mentioned wastewater to adjust the pH of the wastewater to 1, and then gradually add 30% to 40% calcium hydroxide slurry (the rest is water), totaling 200kg. After adding, the pH of the wastewater is 6.9-7.1. Precipitate was precipitated, centrifuged and filtered, and the phosphorus content in the filtrate was detected to be 0.027ppm. The phosphorus content in the filtrate treated by the traditional acid-base neutralization method is 38.37ppm.

Embodiment 3

[0030] Before treatment, the basic properties of wastewater are as follows: (Phosphorus content is about 2000ppm, pH 10.3)

[0031] Add sulfuric acid solution to 8 cubic meters of the above-mentioned wastewater to adjust the pH of the wastewater to 1, then gradually add 30% to 40% calcium hydroxide slurry (the rest is water), totaling 260kg, after adding, the pH of the wastewater is 6.9-7.1. Precipitate was precipitated, centrifuged and filtered, and the phosphorus content in the filtrate was detected to be 0.036ppm. The phosphorus content in the filtrate treated by the traditional acid-base neutralization method is 66.95ppm.

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Abstract

The invention relates to a phosphorus removal process for industrial waste water. The process comprises the following steps of: (1) adjusting the pH value of industrial waste water to 1-3 and then gradually adding calcium hydroxide till the pH value is 6-8; and (2) centrifuging the waste water treated in the step (1), filtering to obtain a filtrate of which the phosphorus content is not more than0.05 ppm, and recycling a solid material. In the invention, on the basis of the conventional acid and alkali neutralizing phosphorus removal process, the acid and alkali neutralizing process is controlled strictly, and the phosphorus removal effect is very remarkable. Moreover, the phosphorus removal process has the advantages of low equipment installation and maintenance costs, low waste water treatment cost, and the like.

Description

technical field [0001] The invention relates to a process for removing phosphorus from industrial wastewater. Background technique [0002] At present, the treatment methods for phosphorus-containing industrial wastewater mainly include acid-base neutralization method and RO reverse osmosis membrane method. The acid-base neutralization method is to add calcium hydroxide or calcium chloride and other calcium compounds to form a series of calcium salt precipitation such as calcium phosphate and other calcium salts in wastewater to achieve the purpose of phosphorus removal. However, due to the diversity of phosphoric acid in aqueous solution (different P exists in different forms at pH) and the corresponding solubility problems of a series of calcium phosphate salts lead to the limitation of this process; the treatment effect of RO reverse osmosis membrane method is very good, but the high cost of equipment installation and maintenance makes this process difficult to use pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/66C02F1/38
Inventor 堀尾博英
Owner MORITA NEW ENERGY MATERIALS ZHANGJIAGANG CO LTD
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