Ionic mine wastewater treatment device and operation method thereof

Abstract

The invention relates to an ionic mine wastewater treatment device and an operation method thereof. The ionic mine wastewater treatment device comprises a combined air floatation system consisting of four rectangular flocculation tank body units and four rectangular air floatation tanks, the combined air flotation system comprises a water inlet area, a flocculation area, a contact area, an air flotation area, a water outlet area, a dissolved air tank and a backflow pipeline area which are sequentially arranged in the water flow direction. According to the treatment device and the operation method thereof, by reasonably controlling the sulfide content, the pH value and the air flotation deslagging process in the acid wastewater at different stages, neutralization precipitation and valuable metal grading recovery of the whole system are achieved; the system has the advantages of simple process, convenience in maintenance, low treatment cost and small occupied area, and the treated wastewater reaches the discharge standard of class 3 water bodies of surface water. The ionic type mine wastewater treatment device can still operate well even under the conditions of unstable water inflow and high pollution load, it is guaranteed that sewage is effectively purified, and the effluent quality is good.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an ionic mine wastewater treatment device and its operating method, and in particular to a wastewater capable of effectively removing heavy metal pollutants in wastewater under conditions of lower pH and higher sulfate content Processing device and method of operation thereof. Background technique [0002] The uncontrolled discharge of mine wastewater without proper treatment poses a serious threat to the ecological environment function of groundwater and public health and safety. Inorganic pollution of groundwater has become one of the main problems of water quality safety in China. Iron and manganese are common elements of inorganic pollution in groundwater, usually due to the dissolution of iron and manganese in insoluble compounds of rocks and minerals through microbial-mediated oxidation reactions, and mainly exist in the form of ferrous ions and manganes...

AI Technical Summary

Problems solved by technology

[0004] However, in the application of biological sulfide precipitation method, it is difficult for conventional treatment devices to suppress the production of hydrogen sulfide gas while achieving the strict anaerobic environment required by sulfate-reducing bacteria, and the device requires high air tightness; and it is in direct contact with mine wastewater The stress of heavy metal ions on microorganisms will affect the efficiency of reducing sulfate, and the generation of divalent sulfide ions is unstable, and it is impossible to carry out fractional precipitation according to the difference in the solubility product of different insoluble compounds.

Furthermore, the particle size of the complex formed by the biological sulfide precipitation method is small, and it is difficult to clarify and separate; the single-stage bioreactor is not easy to clean, and the recovery of heavy metals is difficult, and improper treatment will cause secondary pollution

Images