Chemical wastewater advanced treatment agent, preparation method and application

Abstract

The invention discloses a chemical wastewater advanced treatment agent, a preparation method and application, and belongs to the field of chemical wastewater treatment. The agent comprises activated carbon with the size of 280-300 meshes, diatomite, polymeric ferric salt, polymeric aluminum salt, magnesium salt and poly dimethyl diallyl ammonium chloride, wherein the activated carbon can adsorb organic matters in wastewater and reduce the COD value and chromaticity; magnesium salt can react with phosphate and ammonia nitrogen to form stable precipitate, so that total phosphorus and ammonia nitrogen are removed; the polymeric ferric salt and the polymeric aluminum salt can polymerize, precipitate and remove suspended colloidal macromolecular pollutants; the poly dimethyl diallyl ammonium chloride is a high-molecular cationic flocculant, and also has an excellent decolorizing effect. Through the synergistic effect of the adsorbent and the coagulant, chromaticity, ammonia nitrogen, total phosphorus and COD in wastewater can be better removed, meanwhile, the advanced treatment agent is easy to add and convenient to operate, the wastewater advanced treatment cost can be effectively reduced, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and in particular relates to a chemical wastewater advanced treatment agent, a preparation method and an application. Background technique [0002] As the country becomes more and more strict on environmental protection, the advanced treatment technology and pharmaceutical development of chemical wastewater have received extensive attention. Chemical wastewater, such as coking wastewater, printing and dyeing wastewater, pharmaceutical intermediate wastewater, etc., often still contains high chroma, total phosphorus, ammonia nitrogen and COD after anaerobic or aerobic biochemical treatment. Currently, Fenton technology, coagulation Technology etc. for in-depth processing. [0003] The Fenton reaction refers to the hydrogen peroxide (H 2 o 2 ) at Fe 2+ Under the catalysis of salt, the reaction of hydroxyl radicals is generated. Through this technology, the refractory organic matter ...

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Problems solved by technology

The Fenton oxidation method can have a good removal effect on various refractory organic wastewater, and has the advantages of fast reaction speed and stable treatment effect. 2 o 2 with Fe 2+ The ratio of the ratio is demanding, and after the reaction, a large amount of alkali needs to be added to adjust the pH value, resulting in a large amount of chemical sludge, which makes the treatment cost high and the treatment process complicated

[0004] Coagulation technology is mainly to add coagulant to wastewater, such as inorganic coagulant polyaluminum chloride, polyaluminum sulfate, polyferric chloride, polyferric sulfate, etc. The colloidal macromolecular pollutants suspended in the wastewater are polymerized, precipitated and removed through the combined action of the particles and the groups with positive (negative) charges. It has the advantages of simple operation and low treatment cost, but its solubility The removal effect of organic pollutants is poor, and the wastewater after coagulation treatment still has high chroma and COD

[0005] For the decolorization of chemical wastewater, the organic decolorizer commonly used in China - dicyandiamide formaldehyde resin and its derivatives, is affected by the raw materials and preparation process, and the finished product contains high free formaldehyde and amine small molecular organic matter, although It has a good decolorization effect on chemical wastewater, but adding it in the advanced treatment stage will increase the ammonia nitrogen content and COD value in the wastewater, thus limiting its application in advanced wastewater treatment

[0006] Coking wastewater, printing and dyeing wastewater, and pharmaceutical intermediate wastewater often contain high chroma, total phosphorus, ammonia nitrogen and COD after anaerobic or aerobic biochemical treatment. After advanced treatment with inorganic coagulants, although total phosphorus has Good removal effect, but chromaticity and COD still cannot meet the emission standards