Method for treating phosphate-containing wastewater

A phosphate and wastewater technology, applied in water softening, special treatment targets, multi-stage water treatment, etc., can solve problems such as high treatment costs, hidden dangers of excessive discharge, and strict control of technical parameters, etc., to achieve stable production and operation, The effect of achieving zero emissions

Inactive Publication Date: 2018-10-19
深圳市华虹清源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process method has the following problems: the control of technical parameters is relatively strict; the content of PO43- and NH4﹢ in the discharged water after treatment cannot meet the long-term stable standards, there is a large hidden danger of excessive discharge, and it is increasingly difficult to adapt to the environmental protection requirements under high pressure; At the same time, the added value of magnesium ammonium phosphate is low, and the valuable components in wastewater cannot be rationally utilized and recycled.
[0003] In addition, in the treatment of phosphorus- and nitrogen-containing industrial wastewater, biological methods are currently used to remove nitrogen and phosphorus components in the water body to meet the requirements of water purification. Difficulty in dealing with long-term stable operation, while sludge and bottom sludge are strictly controlled wastes, cumbersome subsequent disposal methods and high treatment costs are all unfavorable factors that limit the application of biological processes

Method used

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Examples

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Effect test

no. 1 example

[0038] The method for the treatment of phosphate-containing wastewater provided by the present embodiment specifically includes the following steps:

[0039] (1) One-step precipitation: the waste water is lifted to the mixed reaction tank through the pump, and the pH value is adjusted to 4.9 by adding ammonia water to form a primary reaction solution. Under the stirring reaction, the Fe in the waste water is 3+ Form Fe(OH) 3 precipitation. The primary reaction solution forms primary precipitation and primary filtrate after plate and frame pressure filtration, and the primary filtrate enters the subsequent process for processing. The primary precipitation is conveyed to the paddle dryer for processing by a screw, and the nitrogen content in the obtained primary precipitation dry material is 7.5 %, the content of phosphorus pentoxide is 41.6%, and the water content is 4.8%.

[0040](2) Two-step precipitation: the primary filtrate is adjusted to pH 8.7 by adding ammonia water t...

no. 2 example

[0048] The method for the treatment of phosphate-containing wastewater provided by the present embodiment specifically includes the following steps:

[0049] (1) One-step precipitation: the waste water is lifted to the mixed reaction tank through the pump, and the pH value is adjusted to 5.1 by adding ammonia water to form a primary reaction solution. Under the stirring reaction, the Fe in the waste water is 3+ Form Fe(OH) 3 precipitation. The primary reaction solution forms primary precipitation and primary filtrate after plate and frame pressure filtration, and the primary filtrate enters the subsequent process for processing. The primary precipitation is conveyed to the paddle dryer for processing by a screw, and the nitrogen content in the obtained primary precipitation dry material is 7.8 %, the content of phosphorus pentoxide is 40.5%, and the water content is 5.2%.

[0050] (2) Two-step precipitation: the primary filtrate is adjusted to pH 8.8 by adding ammonia water ...

no. 3 example

[0058] The method for the treatment of phosphate-containing wastewater provided by the present embodiment specifically includes the following steps:

[0059] (1) One-step precipitation: the waste water is lifted to the mixing reaction tank through the pump, and the pH value is adjusted to 5.0 by adding ammonia water to form a primary reaction solution. Under the stirring reaction, the Fe in the waste water is 3+ Form Fe(OH) 3 precipitation. The primary reaction solution forms primary precipitation and primary filtrate after plate and frame pressure filtration, and the primary filtrate enters the subsequent process for processing. The primary precipitation is conveyed to the paddle dryer for processing by a screw, and the nitrogen content in the obtained primary precipitation dry material is 7.5 %, the content of phosphorus pentoxide is 41.9%, and the water content is 4.9%.

[0060] (2) Two-step precipitation: the primary filtrate is adjusted to pH 9.0 by adding ammonia water...

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Abstract

A method for treating phosphate-containing wastewater comprises the following steps: the wastewater is lifted to a mixed reaction tank by a pump, and the pH value of the wastewater is adjusted to a first range by using an inorganic alkali in order to precipitate first-type metal cations from a formed primary reaction liquid in order to obtain a primary precipitate and a primary filtrate, wherein the first precipitate includes phosphorus and nitrogen salts; the pH value of the primary filtrate is adjusted to a second range by using the inorganic alkali to precipitate second-type metal cations from a formed secondary reaction liquid in order to obtain a secondary precipitate and a secondary filtrate, wherein the second precipitate includes phosphorus and nitrogen salts; a secondary reactionliquid is filtered by a tubular microfiltration membrane to obtain micro-filtered water; and the micro-filtered water goes through a concentrating reverse osmosis device to obtain concentrated water and freshwater, and the concentrated water is mechanically evaporated by an evaporator to obtain industrial grade ammonium sulfate and ammonium dihydrogen phosphate. The method for treating phosphate-containing wastewater has the advantages of stability in production running, environmental protection, high efficiency, and realization of zero discharge of sewage.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, and in particular to a method for treating phosphate-containing wastewater. Background technique [0002] In the process of preparing new energy battery precursor material iron aluminum phosphate, chemical mother liquor wastewater will be generated, and this type of wastewater contains phosphate. Specifically, the pollution factors in this type of wastewater are mainly PO43-, NH4+, Mn2+, etc. The current traditional treatment method is to use the magnesium ammonium phosphate precipitation method to treat phosphate-containing industrial wastewater, and the magnesium ammonium phosphate precipitate can be collected as feed additives or fertilizer additives. This process method has the following problems: the control of technical parameters is relatively strict; the content of PO43- and NH4﹢ in the discharged water after treatment cannot meet the long-term stable standards, there is a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/441C02F1/444C02F1/64C02F1/66C02F5/02C02F9/00C02F2101/105C02F2209/06C02F2209/18C02F2301/08C02F2303/14
Inventor 吴宋超包佩单升益
Owner 深圳市华虹清源环保科技有限公司
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