Union modified montmorillonite adsorbent for denitration and dephosphorization and preparation method of adsorbent

Abstract

The invention provides a union modified montmorillonite adsorbent for denitration and dephosphorization and a preparation method of the adsorbent and belongs to the technical field of sewage treatmentadsorbents. According to the adsorbent, montmorillonite is used as an original modification substrate, and lanthanum and 1,4-butyl-bis(dodecydimethylammonium bronides) are used as inorganic and organic modification agents. The modification method comprises the steps that 1, montmorillonite is modified by lanthanum ions and 1,4-butyl-bis(dodecydimethylammonium bronides) in sequence; 2, centrifugation cleaning is conducted, and the product is dried, ground and sieved by a 100-mesh sieve to obtain the lanthanum / gemini quaternary ammonium salt union modified montmorillonite adsorbent. The adsorption quantity of the adsorbent for bitrate radicals and orthophosphate radicals can reach 70.7 mg / g and 49.4 mg / g respectively. The adsorbent has the advantages of large interlamellar spacing, synchronous adsorption for the bitrate radicals and orthophosphate radicals, high adsorption speed, high adsorption capacity and the like, and is suitable for treatment of living sewage and eutrophic water and particularly suitable for depth treatment of secondary effluent treatment of sewage treatment factories in cities and towns.

Description

technical field [0001] The invention relates to the technical field of sewage treatment adsorbents, in particular to a combined modified montmorillonite adsorbent for denitrification and phosphorus removal and a preparation method thereof. Background technique [0002] With the acceleration of urbanization and the continuous development of industry, the discharge of urban domestic sewage and industrial wastewater is also increasing rapidly. A large amount of untreated or substandard treated wastewater is discharged into natural water bodies, which is harmful to the surface water environment and groundwater environment. Cause direct and potential harm, among which the phenomenon of eutrophication of water body is the most serious, and the excess of nitrogen and phosphorus content is the main cause of eutrophication of water body. At present, the methods of denitrification and phosphorus removal include physical method, chemical method and biological method. Among them, the ch...

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Problems solved by technology

At present, the methods of denitrification and phosphorus removal include physical method, chemical method and biological method. Among them, the chemical method usually needs to add chemical agents, which is costly and easy to cause secondary pollution and other problems; the biological method is mainly based on activated sludge. such as A 2 / O method, SBR method, etc., the technological process is relatively complex, and the living environment and conditions of microorganisms change greatly, the effect of nitrogen and phosphorus removal is unstable, the effluent water quality fluctuates greatly, and at the same time, it has high investment and construction costs, and the purification time period is long. long-term disadvantages

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