Method for adsorbing glycerol contained in wastewater by using resin treated by boric acid

Abstract

The invention provides a method for adsorbing glycerols contained in wastewater by using a resin treated by boric acid. The method comprises the following steps: using a macroporous anion resin to form a boric acid ion resin through boric acid treatment; placing the boric acid ion resin in a wastewater treatment device containing the glycerols; taking out the boric acid ion resin adsorbed with the glycerols when the glycerol content in outlet water of the wastewater treatment device reaches a set value; eluting a boric acid and glycerol complex adsorbed to the boric acid ion resin through acid and alkali treatment; and then continuing to use the boric acid ion resin, wherein the specific steps are as follows: (1), pretreatment of the adsorbing resin, (2), modification of the adsorbing resin, (3), adsorption of the glycerols in the wastewater, and (4), desorption of the boric acid and glycerol complex adsorbed to the boric acid ion resin; and the treated resin can be recycled. On the basis of a principle that the boric acid can react with the glycerols, the invention provides the novel method for adsorbing the glycerols in the wastewater; therefore, the wastewater containing the glycerols can be effectively treated and purposes of saving resources and protecting the environment are achieved.

Description

technical field [0001] The invention relates to the technical field of chemical engineering and sewage treatment by chemical methods, in particular to a method for adsorbing glycerin contained in waste water with resin treated with boric acid. Background technique [0002] With the vigorous development of biodiesel and other new energy industries in various countries, there will be a large surplus of glycerin, a by-product of biodiesel production. In this case, someone has developed a process for directly producing epichlorohydrin from glycerin. However, the wastewater produced by this process is high-salt organic wastewater, and most of the organic matter in the wastewater is glycerin. [0003] The applicant of the present invention has already applied for a patent on how to treat the above wastewater, see Chinese Patent Application No. 200910046417.0 "Method and device for treating wastewater from producing epichlorohydrin using glycerol as raw material". Since the patent...

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Problems solved by technology

Since the patent application only adsorbs glycerin, but does not convert it, the recovery device must be rinsed with water to desorb the adsorbed glycerin. The desorbed water only contains glycerin. Although it is easy to handle, the waste water cannot be returned to In glycerin to epichlorohydrin plant, new waste will be created if reprocessing is not carried out