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Technique for biological treatment of mine acidic wastewater
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A technology for acid mine wastewater and biological treatment, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to reduce wastewater treatment cost, no secondary pollution, and good treatment effect
Inactive Publication Date: 2010-08-11
TAIYUAN UNIV OF TECH
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Problems solved by technology
Biological treatment of acid mine wastewater has obvious effects and advantages compared with the above-mentioned methods, but there is still the problem of selecting a technically feasible and economically reasonable sulfate-reducing bacteria carbon source, and the disposal of the final product of biological treatment also needs to be determined. Towards Economical Rationalization
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Embodiment approach 1
[0040] Embodiment 1, sulfate bioreduction reactor, the sulfate load is 7.0kgSO 4 2- / m 3 d, the temperature is 35°C, COD / SO 4 2- The value is 1.2, the influent pH value is 6.5, and the rising flow rate V of the anaerobic expanded granular sludge bed reactor EGSB up is 3.0m / h, the reflux ratio is 80:1, and the hydraulic retention time HRT is 0.2d; the reflux ratio of the anaerobic biofilter AF is 20:1, and the HRT is 0.25d; the anaerobic baffle reactor ABR, HRT is 0.2d; or anaerobic fluidized bed reactor AFBR, HRT is 0.02d; colorless sulfur bacteria CSB biological oxidation of S 2- Reactor, pH 8.0, temperature 15°C, sulfide loading 12.0kg / m 3 d, DO≈5.5mg / L in the reactor; slow sand filter, with a filtration rate of 0.1m / h and a filtration cycle of 25d, intercepting elemental sulfur S in the sand layer of the surface layer 6cm; the particle size of the sand filter layer is 1.2mm , thickness 25cm; supporting layer sand particle size from bottom to top 5.0mm, 2.5mm, 1.2mm, e...
Embodiment approach 2
[0041] Embodiment 2, sulfate bioreduction reactor, the sulfate load is 4.0kgSO 4 2- / m 3 d, anaerobic expanded granular sludge bed reactor EGSB, HRT is 0.5d; anaerobic biological filter AF, HRT is 0.75d; anaerobic baffle reactor ABR, HRT is 0.6d; or anaerobic fluidized Bed reactor AFBR, HRT is 0.16d, other is the same as Embodiment 1.
Embodiment approach 3
[0042] Embodiment 3, sulfate bioreduction reactor, the sulfate load is 1.0kgSO 4 2- / m 3 d, anaerobic expanded granular sludge bed reactor EGSB, HRT is 0.85d; anaerobic biological filter AF, HRT is 1.25d; anaerobic baffle reactor ABR, HRT is 1.0d; or anaerobic fluidized Bed reactor AFBR, HRT is 0.3d, other is the same as embodiment 1.
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Abstract
The invention relates to a process for biologically treating wastewater with sulfate and hydrochloric acid and recycling elemental sulfur, belonging to the technical fields of environmental protection and wastewater treatment, which is characterized in that in the process, the sludge acidic fermentation products from a wastewater treatment plant is used as carbon source sulfate reducing bacteria for treating acidic sulfate wastewater and recycling the elemental sulfur; the sulfate reducing bacteria SRB in an anaerobic biological reactor reduces sulfate SO4<2-> creature as hydrogen sulfide H2Sof colorless sulfur bacteria CSB in an aerobic biofilm reactor reduces H2S or S<2->creature as the elemental sulfur and then the obtained substance is filtered and sand-scrapped by a slow sand filter; the elemental sulfur S in sand filtering material is completely dissolved by an extraction equipment; the extractant CS2, the sand filtering material and the biofilm are separated by a solid-liquid separator; the extracted solution is distilled by a distillation equipment; the distilled solution is parched by a drying device and then the elemental sulfur is recycled.In the invention the mine wastewater with the sulfate and the hydrochloric acid is treated; the elemental sulfur is recycled and the sludge from the wastewater treatment plant achieves resource utilization and harmlessness.
Description
1. Technical field [0001] The invention discloses a process for biologically treating acidic mine wastewater, which belongs to the technical field of environmental protection and wastewater treatment. Specifically, it is a technical scheme for biologically treating sulfate-containing acidic mine wastewater and recovering elemental sulfur. 2. Background technology [0002] Wastewater discharged from the mining industry contains high concentrations of sulfate, its SO 4 2- The content is mostly 2000~3000mgSO 4 2- / L, some are higher than 3000mgSO 4 2- / L, even up to 5000~6000mgSO 4 2- / L. The wastewater is mostly acidic, with a pH as low as 2.5 to 3.0, and contains various heavy metals such as Fe, Mn, Ni, Zn, Cu, Al, Mg, Cd, and Pb. If this sulfate-containing acidic mine wastewater is discharged directly into the water body without treatment, it will acidify the receiving water body, lower the pH, harm aquatic organisms, and cause potential corrosion. Sulfate-containi...
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