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A treatment method for wastewater containing high-concentration phosphite

A phosphite and treatment method technology, which is applied in the field of industrial wastewater treatment, can solve the problems of unconsidered chemical sludge treatment and disposal, and achieve the effects of solid-liquid separation, high oxidation efficiency, and high solubility

Active Publication Date: 2015-11-04
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Application Information

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Problems solved by technology

[0006] Treatment and disposal of the chemical sludge produced is not considered in most studies

Method used

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  • A treatment method for wastewater containing high-concentration phosphite
  • A treatment method for wastewater containing high-concentration phosphite
  • A treatment method for wastewater containing high-concentration phosphite

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The chemical production of acrylamide in a refining and chemical company adopts sodium hypophosphite reduction method to prepare copper catalyst. The total phosphorus content in the production wastewater is 850-2100 mg / L, of which phosphorus accounts for 75% to 80% of the total phosphorus content; the pH value is 12.5-14.0. Five batches of water were taken from the site successively for testing. The test parameters and results are shown in Table 1.

[0030] Table 1

[0031]

[0032]

[0033] X-ray diffraction and X-ray fluorescence broad-spectrum analysis were performed on the chemical sludge produced by the primary precipitation and secondary precipitation respectively. The results showed that the main composition of the primary sediment was CaHPO 3 ·H 2 O, the secondary precipitate is mainly composed of Ca 9.8 (PO 4 ) 6 (OH) 1.92 .

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Abstract

The invention relates to a treatment method for wastewater containing high-concentration phosphate. The treatment method is characterized in the total phosphorus of effluent is less than 1mg / L by adopting a three-level chemical phosphorus removal process. The treatment method specifically comprises the following steps: adding excessive precipitator into wastewater in a primary reaction pond and adding a settling agent and PAM into a primary flocculation basin to settle; after effluent enters into a secondary reaction pond, putting ozone into the pond to generate undissolved substances and adding the settling agent and PAM into a mixed liquid in a secondary flocculation basin to settle; after effluent enters into a third flocculation basin, adding PAC and PAM for flocculent precipitate so as to remove residual small particle undissolved substances in wastewater so as to further reduce the total phosphorus content of the wastewater; and finally, adjusting the pH value or removing hard substances from the effluent according to demand, wherein the precipitator is calcium chloride and the settling agent is one or more of ground calcium carbonate, quick lime / slaked lime and gypsum powder.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment. The invention relates to a treatment method for wastewater containing high-concentration phosphite. Background technique [0002] As a reducing agent, sodium hypophosphite can be used for electroless nickel plating, copper plating, and copper powder preparation. It is widely used in electronics, machinery, petroleum, chemical, pharmaceutical and other industries. The waste water produced contains high concentrations of phosphite and a small amount of phosphate. , and its content far exceeds the wastewater discharge requirements. There are few relevant patent documents on the treatment of phosphite wastewater, but there are relatively many patent documents on the conversion of wastewater containing reduced phosphorus into orthophosphorus by oxidation methods, and then by chemical precipitation. [0003] Chinese invention patent high phosphorous wastewater treatment process (applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/52
CPCC02F1/52C02F1/5236C02F1/56C02F1/78C02F9/00C02F2101/105C02F2301/08
Inventor 陆彩霞邵强钱光磊孙玉凤张艳芳滕厚开陈爱民
Owner CNOOC TIANJIN CHEM RES & DESIGN INST