Adsorbent for adsorbing heavy metal ions in wastewater and adsorption process

Abstract

The invention relates to the technical field of wastewater purification, in particular to an adsorbent for adsorbing heavy metal ions in wastewater, i.e., waste residues obtained after xylitol is prepared by using corncobs. An adsorption process for heavy metal ions in wastewater comprises the following steps of: placing the adsorbent into wastewater containing heavy metal ions; adsorbing at a certain pH value and temperature for a certain time; and after the adsorption is ended, filtering to obtain filtrate, adjusting the filtrate to be neutral and discharging. The adsorbent for adsorbing heavy metal ions in wastewater has high adsorption capacity and can be directly filtered and removed after the adsorption process is ended, therefore, the cost is low, and the process is simple; and after being used, the adsorbent can be directly filtered and separated from the water, burned or further treated so as to play very important roles in solving the problem of environment pollution and promoting the recycle of wastes.

Description

technical field [0001] The invention relates to the technical field of wastewater purification, in particular to an adsorbent for heavy metal ions in wastewater and an adsorption process using the adsorbent. Background technique [0002] A large amount of chromium-containing wastewater produced by electroplating, tanning, printing and dyeing, mining and other industries has seriously polluted the environment, and electroplating wastewater alone discharges 4 billion m3 per year. 3 . Chromium-containing wastewater is extremely harmful, especially hexavalent chromium. Once absorbed and accumulated by the human body, it will cause various diseases such as cancer. High concentrations of trivalent chromium in water will lead to fish death. The chromium wastewater is treated to meet the discharge standard. At present, the treatment of chromium-containing wastewater mainly adopts biological method, electrolysis method, ion exchange method, redox method, adsorption method and so ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the waste residue utilization problem of xylitol production enterprises and the problem that the adsorption treatment of waste water containing heavy metals still cannot reach the standard, the present invention proposes a method of producing wood from corncobs. Adsorbent for heavy metal ions in waste water after sugar alcohol as raw material