CN-224212536-U - Sequential reaction device suitable for passive treatment of acid mine wastewater

Abstract

The utility model relates to a sequential reaction device suitable for passive treatment of acid mine wastewater, which comprises a water storage tank, a neutralization reaction tank, an MOB reactor and an SRB reactor which are sequentially connected by pipelines and the heights of liquid outlets of which are gradually reduced, wherein the lower parts of the water storage tank, the neutralization reaction tank, the MOB reactor and the SRB reactor are respectively provided with corresponding liquid inlets, and corresponding reaction units are arranged in the neutralization reaction tank, the MOB reactor and the SRB reactor. The method is based on water quality characteristics, the topography and oxygen supply conditions are reasonably utilized, the collected AMD is passively treated, manganese oxidizing bacteria are introduced, mn (II) oxidation is promoted by means of Mn (III/IV) manganese oxide generated by the manganese oxidizing bacteria, other heavy metal ions are adsorbed, the manganese removal efficiency is greatly improved, the multi-stage treatment of a neutralization reaction tank and an SRB reactor is combined, the pH of effluent water is improved while heavy metal ions and sulfate radicals in the AMD are removed, the multi-stage purification of the AMD is completed, and the method is particularly suitable for acidic heavy metal mine wastewater with high manganese ion concentration.

Inventors

• YANG LIHONG
• HUANG ZHIXIONG
• LIU BAOBO
• WANG JIANWEI
• LIU ZUN

Assignees

• 中节能大地（杭州）环境修复有限公司

Dates

Publication Date

20260508

Application Date

20250511

Claims (10)

1. 1. The sequential reaction device suitable for the passive treatment of the acid mine wastewater is characterized by comprising a water storage tank, a neutralization reaction tank, an MOB reactor and an SRB reactor which are sequentially connected by pipelines, wherein the heights of liquid outlets of the water storage tank, the neutralization reaction tank, the MOB reactor and the SRB reactor are gradually reduced; The lower parts of the neutralization reaction tank, the MOB reactor and the SRB reactor are respectively provided with corresponding liquid inlets, and corresponding reaction units are arranged in the neutralization reaction tank, the MOB reactor and the SRB reactor.
2. 2. The sequential reaction device suitable for passive treatment of acid mine wastewater according to claim 1, wherein the distance between the liquid outlet of the water storage tank and the liquid inlet of the neutralization reaction tank is larger than a preset value, and an overflow port is arranged above the liquid outlet of the neutralization reaction tank.
3. 3. The sequential reaction device for passive treatment of acid mine wastewater according to claim 1, wherein any one of the pipelines is provided with a flow regulating valve.
4. 4. The sequential reaction device for passive treatment of acid mine wastewater of claim 1, wherein water distribution pipelines are arranged at the bottoms of the inner sides of the neutralization reaction tank, the MOB reactor and the SRB reactor, inlets of the water distribution pipelines are connected with liquid inlets of the neutralization reaction tank, the MOB reactor and the SRB reactor, and liquid outlets are arranged on the water distribution pipelines.
5. 5. The sequential reaction device for passive treatment of acid mine wastewater of claim 1, wherein the reaction unit in the neutralization reaction tank comprises a plurality of alkaline gravel layers for neutralizing the acid mine wastewater.
6. 6. The sequential reaction device for passive treatment of acid mine wastewater of claim 5, wherein the particle size of the alkaline gravel layer gradually decreases from bottom to top.
7. 7. The sequential reaction apparatus for passive treatment of acid mine wastewater of claim 1, wherein said MOB reactor and said SRB reactor comprise carriers for inoculating microorganism cells in a predetermined ratio.
8. 8. The sequential reaction device for passive treatment of acid mine wastewater of claim 7, wherein the reaction unit comprises a plurality of biological floating balls, and the carriers are filled in the biological floating balls.
9. 9. The sequential reaction device for passive treatment of acid mine wastewater of claim 8, wherein a carbon source donor is further filled in the biological suspension ball matched with the carrier.
10. 10. The sequential reaction device suitable for passive treatment of acid mine wastewater of claim 1, wherein a sealing cover is arranged in cooperation with the SRB reactor, and a tail gas collecting hole is arranged on the sealing cover.

Description

Sequential reaction device suitable for passive treatment of acid mine wastewater Technical Field The utility model relates to the technical field of treatment of water, wastewater, sewage or sludge, in particular to a sequential reaction device suitable for passive treatment of acid mine wastewater. Background The waste rock yards and goaf produced in the exploitation of sulfur-containing metal often expose minerals such as pyrite (FeS 2) contained in ore bodies to natural environment, and acid mine wastewater (Acid and Metalliferous Drainage, AMD) is generated under the combined action of oxygen, water and microorganisms. AMD usually has a pH below 4.0 and contains high concentrations of sulfate and heavy metal ions such As iron (Fe), manganese (Mn), zinc (Zn), lead (Pb), cadmium (Cd), copper (Cu), arsenic (As), etc., which if not collected and treated, can cause rapid acidification of water and soil in its basin and overproof concentrations of heavy metal ions, and these heavy metals can gradually accumulate in organisms through the food chain, posing a serious threat to the safety of the basin's water and soil ecosystem and to the health of the residents. The traditional physical and chemical treatment processes have high running and maintenance costs, and development of AMD passive treatment technology based on a microbiological method is a necessary trend for mining areas which need long-term treatment but cannot provide operation and maintenance support, particularly abandoned mining areas. The AMD passive treatment technology using the microbiological method as the basic process has the advantages that firstly, the microbiological method removes pollutants in the wastewater by utilizing the metabolic activity of specific microorganisms, reduces the risk of secondary pollution, is more friendly to the environment than the traditional chemical method, and secondly, the microbiological treatment unit is usually operated passively due to the fact that the microorganisms can self-reproduce and exert effectiveness under proper conditions, so that the operation cost is low, maintenance measures are few, even unmanned under certain conditions can be achieved, and in addition, the microbiological treatment technology has a synergistic effect and shows higher flexibility and adaptability when the wastewater with more complex components is treated. Among the passive treatment technologies of acid mine wastewater, common technologies include reducing sulfate to hydrogen sulfide by sulfate reducing bacteria (Sulfate Reducing Bacteria, SRB), forming metal sulfide with extremely low solubility by S 2- and heavy metal ions, achieving the purpose of removing heavy metals, and oxidizing Mn (II) to Mn (IV) by manganese oxidizing bacteria (MANGANESE-oxidizing Bacteria, MOB) to form insoluble manganese oxide, thereby removing manganese ions in wastewater. The two types of microorganisms can effectively treat various pollutants in the acid mine wastewater under the combined action, and a more sustainable solution is provided for the development of the passive treatment technology of the acid mine wastewater. However, the prior art also has the following disadvantages: (1) Due to the special chemical property of manganese, the traditional AMD passive treatment system mainly comprising Sulfate Reducing Bacteria (SRB) cannot effectively capture Mn (II), so that the treatment efficiency of Mn (II) in AMD with high manganese ion concentration is poor, and the damage of manganese to the water environment and water ecology of a flow field is caused; (2) The metabolic reactions with SRB require continuous electron donors, which lead to increased demands on organic matter, thus bringing high costs, making implementation challenging; (3) When the concentration of heavy metals in AMD is too high, the inhibition of SRB activity may lead to a decrease in the processing efficiency of the processing system and, in severe cases, even to a breakdown of the system. Disclosure of utility model The utility model solves the problems existing in the prior art and provides a sequential reaction device suitable for passive treatment of acid mine wastewater. The technical scheme adopted by the utility model is that the sequential reaction device suitable for the passive treatment of acid mine wastewater comprises a water storage tank, a neutralization reaction tank, an MOB reactor and an SRB reactor which are sequentially connected by pipelines, wherein the heights of liquid outlets of the water storage tank, the neutralization reaction tank, the MOB reactor and the SRB reactor are gradually reduced; The lower parts of the neutralization reaction tank, the MOB reactor and the SRB reactor are respectively provided with corresponding liquid inlets, and corresponding reaction units are arranged in the neutralization reaction tank, the MOB reactor and the SRB reactor. Preferably, the distance between the liquid outlet of the water storage tank and t