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A kind of hypophosphite treatment device and method for preventing iodine loss

A hypophosphite and treatment device technology, which is applied in energy wastewater treatment, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of incomplete hypophosphite oxidation and high treatment cost, and achieve high selectivity and high oxidation efficiency. , The effect of simple process operation control

Active Publication Date: 2022-07-12
ZHEJIANG HI TECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, phosphite can also react with calcium ions or iron ions to form precipitates and remove them. However, the existing hypophosphite oxidation processes directly oxidize it to orthophosphate. There is no selectivity in the oxidation process, and the treatment cost is high. Incomplete oxidation of phosphate

Method used

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  • A kind of hypophosphite treatment device and method for preventing iodine loss
  • A kind of hypophosphite treatment device and method for preventing iodine loss
  • A kind of hypophosphite treatment device and method for preventing iodine loss

Examples

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Effect test

Embodiment 1

[0068] The device and method of the present invention are used to treat the chemical nickel plating waste liquid collected separately in a sewage treatment plant in an electroplating park. The daily treated water volume is 40t, the hypophosphite content is 500mg / L, and the operation time of the device is 12h / d.

[0069] The electroless nickel plating waste liquid to be treated is first subjected to ultrafiltration treatment by the ultrafiltration treatment unit to intercept the suspended solids and macromolecular organic matter in the waste liquid, and then enter the reaction unit. The reaction unit is three sets of reactor assemblies operating in parallel, and each reactor assembly includes a first main reactor and a second main reactor. The first main reactor and the second main reactor are uniformly filled with a plurality of activated carbon columns, and the diameter of each activated carbon column is 1 m, and the height of the granular activated carbon filled in the activ...

Embodiment 2

[0071]An electroplating sewage treatment plant conducts centralized treatment of chemical nickel wastewater discharged from multiple production workshops. The wastewater is first discharged into a regulating tank, and then treated by the treatment device of the present invention. The average amount of water entering the device is 60t / d, and the concentration of hypophosphite in the influent is about 750mg / L. In the design process, considering the large daily processing capacity and the input of activated carbon, nanofiltration treatment is added to the pretreatment unit, and the effluent enters the main reaction unit after passing through the dosing unit. The reaction units are 5 main reactor groups operating in parallel, and each reactor assembly includes a first main reactor and a second main reactor. There is only one activated carbon column in the first main reactor and the second main reactor respectively, and the activated carbon column completely fills the inner cavity ...

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Abstract

The invention discloses a hypophosphite treatment device for preventing iodine loss and a method thereof. The device comprises an ultrafiltration treatment unit, a dosing unit and a reaction unit which are connected in sequence through pipelines; The reactor assembly includes a first main reactor and a second main reactor, and the water inlet pipe entering the reactor assembly is divided into a first passage and a second passage; the first main reactor and the second main reactor have the same structure, and both include interception Net, orifice plate, at least one activated carbon column and shell for adsorbing iodine element; the bottom of the shell is provided with a water inlet, and the top is provided with a water outlet; the inner cavity is axially divided into a water inlet area and a reaction area by the intercepting net and the orifice plate and outlet area. The invention periodically changes the opening and closing of the first passage and the second passage, so that only one passage is opened, so as to avoid loss and loss caused by the separation of the iodine element from the activated carbon column during the migration process of the water flow.

Description

technical field [0001] The invention belongs to the field of complex heavy metal wastewater treatment, and in particular relates to a hypophosphite treatment device and a method for preventing iodine loss. Background technique [0002] Electroless nickel plating solution is mainly composed of nickel salt, complexing agent, reducing agent and additives. Nickel salt is the main salt of the plating solution. Nickel sulfate is generally used, followed by nickel chloride, and nickel acetate and nickel carbonate. At the same time, it can prevent the precipitation of hydroxide and phosphite; sodium hypophosphite is generally used as the reducing agent, and its function is to provide active hydrogen atoms through catalytic dehydrogenation, and reduce nickel ions to metallic nickel. [0003] The huge electroless plating industry not only promotes the rapid development of modern industry, but also brings serious environmental pollution problems. Periodically scrapped electroless plat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/10C02F103/16
CPCC02F9/00C02F2101/105C02F2103/16C02F1/444C02F1/66C02F1/766C02F1/281C02F1/442Y02W10/37
Inventor 张世新何晓洁杨青张浩俊刘国庆林金威邵元卿金素素楼洪海
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH
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