Floatation wastewater biological treatment process

Abstract

The invention provides a floatation wastewater biological treatment process which comprises an adjusting buffer tank, a xanthate degradation tank and a sulfate reduction tank, wherein a xanthate degradation bacterium and a sulfate reduction bacterium are adopted to treat floatation wastewater; a sulfur source and a carbon source are provided for the sulfate reduction bacterium through metabolite of the xanthate degradation bacterium; sulfur ions can be generated from metabolism of the sulfate reduction bacterium; the sulfur ions can be reacted with heavy metal ions in the flotation wastewater so as to generate metal sulfide precipitate. The floatation wastewater biological treatment process has the advantages that through synergism of the xanthate degradation bacterium and the sulfate reduction bacterium, degradation of a beneficiation reagent xanthate in the flotation wastewater can be achieved, valent resources in the flotation wastewater can be recycled, and resource recycling can be achieved.

Description

technical field [0001] The invention relates to a biological treatment process for flotation wastewater, in particular to a process for synergistically treating flotation wastewater with xanthate-degrading bacteria and sulfate-reducing bacteria. Background technique [0002] With the rapid development of society and industry, the demand for mineral resources is also increasing. As a main method in mineral processing, flotation has been widely used. To be selected, it is necessary to add a large amount of flotation reagents in different operations, mainly collectors, foaming agents, activators and inhibitors. After the mineral separation process is completed, some metal ions, suspended solids, organic and inorganic reagents It will remain in the waste water solution of mineral processing, thus forming mineral processing wastewater containing a large amount of harmful substances. According to statistics, the total amount of wastewater discharged by mining mineral processing pl...

AI Technical Summary

Problems solved by technology

[0003] Judging from the current situation of domestic mineral processing wastewater treatment, due to the poor conventional treatment effect of mineral processing wastewater, a large amount of chemical agents and heavy metal ions remain in the treated water, resulting in a large drop in the yield of concentrate, so the current recycling rate of mineral processing wastewater Generally at 70% - 80%, complete reuse of wastewater is rare, how to achieve efficient and low-consumption treatment of mineral processing wastewater has become a problem that plagues the mineral processing industry

[0004] At present, the amount of water and waste water in mineral processing plants is very large. Natural clarification method, oxidation method, combined precipitation and oxidation treatment, coagulation sedimentation method, chemical neutralization method, aeration aeration method and other technologies are usually used to discharge mineral processing wastewater up to standard. Treatment, adding chemical agents for flotation wastewater treatment, not only requires a large investment, but also easily produces a large amount of non-reactive sludge and solid residues containing a large amount of metal elements, causing secondary pollution, and at the same time, causing loss and waste of metals in wastewater ; Xanthate (xanthate) as the most important class of flotation agents, its chemical name is alkyl dithiocarbonate, currently the most widely used is butyl xanthate, xanthate has the effect on the central nervous system Obvious inhibitory effect can cause animals to die of respiratory failure. 5mg / L xanthate can kill most fish within three days. Very low concentration can make water smell bad and have adverse effects on the environment

[0005] In the process of sulfide beneficiation, due to the addition of inhibitors (such as sulfate) and the oxidation of sulfide ore, the wastewater contains a large amount of sulfate and heavy metal ions. Due to the toxicity of metal ions, the beneficiation agents lack sufficient activity The microbial strains degrade it, and the flotation reagents that have not fully reacted in the flotation process accumulate in the wastewater, which has an adverse effect on the treatment of mineral processing wastewater