Treatment method for phosphorus-containing electroplating wastewater

Abstract

The invention belongs to the technical field of chemical equipment, and discloses a treatment method for phosphorus-containing electroplating wastewater. The treatment method for the phosphorus-containing electroplating wastewater comprises the following steps: performing dephosphorization treatment on the phosphorus-containing waste liquid by utilizing a mechanical mixing reactor, a high-efficiency inclined-tube precipitator and lime, and performing precipitation nickel removal treatment by adding sodium hydroxide and adding a heavy metal trapping agent M1; preparing a modified improved attapulgite adsorbent; adding the attapulgite adsorbent into the waste liquid, and performing adsorption treatment on the phosphorus-containing waste liquid under pressurization and stirring; performing centrifugal separation on the treated waste liquid by utilizing a high-speed centrifuge, performing suction filtration, and measuring a phosphorus content in the filtrate by adopting a dimethylglyoximephotometric method and a 7200 spectrophotometer; and performing suction filtration on the used attapulgite, and performing accumulation to prepare phosphate fertilizer farmyard manure. According to the method provided by the invention, the waste liquid treated by the method meets the national discharge standards in China, and after the used attapulgite is subjected to suction filtration, the obtained material can be accumulated to prepare the phosphate fertilizer farmyard manure, so that the utilization rate of the waste is improved, and a large amount of costs are saved.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a treatment method for phosphorus-containing electroplating wastewater. Background technique [0002] At present, the commonly used existing technology in the industry is as follows: the electroless nickel plating waste liquid contains a large amount of phosphorus and nitrogen, and phosphorus is the main factor leading to eutrophication of water bodies. If it is discharged without treatment, it will cause serious pollution to the environment. Accelerate the formation of eutrophication in water bodies. The currently used attapulgite has not been modified, and the effect of adsorbing phosphorus in the waste liquid is poor, and the treatment efficiency is low. At present, the phosphorus waste liquid is discharged after reaching the discharge standard, and the utilization rate of the waste is low, and the cost increases. [0003] In summary, the problems in th...

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Problems solved by technology

[0004] (1) The attapulgite currently used has not been modified, and the effect of adsorbing phosphorus in the waste liquid is poor, and the treatment efficiency is low;

[0005] (2) At present, phosphorus waste liquid is discharged after reaching the discharge standard after treatment, the utilization rate of waste is low, and the cost increases;

[0006] (3) In the prior art, phosphorus-containing electroplating wastewater also has heavy metal ions such as nickel to exist, and the wastewater after treatment is used as phosphate fertilizer due to the presence of nickel, which will cause heavy metal pollution of the soil, affect soil balance, and destroy the stability of the ecosystem

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