Technique for biological treatment of mine acidic wastewater

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 achieve good treatment effect, no secondary pollution, and reduce wastewater treatment cost

Inactive Publication Date: 2008-07-16
TAIYUAN UNIV OF TECH
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AI-Extracted Technical Summary

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 an...
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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 H2S of 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.

Application Domain

Technology Topic

Slow sand filterChemistry +17

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  • Technique for biological treatment of mine acidic wastewater

Examples

  • Experimental program(20)

Example Embodiment

[0040] Embodiment 1. Sulfate biological reduction reactor, sulfate load is 7.0kgSO 4 2 /m 3 ·D, the temperature is 35℃, COD/SO 4 2- The value is 1.2, the pH value of the inlet water is 6.5, and the rising flow rate of EGSB in the anaerobic expanded granular sludge bed reactor v up The reflux ratio is 3.0m/h, the reflux ratio is 80:1, the hydraulic retention time HRT is 0.2d; the AF reflux ratio of the anaerobic biological filter is 20:1, HRT is 0.25d; the anaerobic baffle reactor ABR, HRT is 0.2d; Anaerobic fluidized bed reactor AFBR, HRT is 0.02d; colorless sulfur bacteria CSB biological oxidation S 2- The reactor has a pH of 8.0, a temperature of 15°C, and a sulfide load of 12.0kg/m 3 ·D, DO in the reactor ≈ 5.5mg/L; slow sand filter, filtration rate of 0.1m/h, filtration cycle of 25d, intercepting elemental sulfur S in the sand layer of 6cm on the surface; particle size of the sand filter layer is 1.2mm , Thickness 25cm; supporting layer sand grains from bottom to top, particle size 5.0mm, 2.5mm, 1.2mm, height of each layer 3cm; extraction equipment, with carbon disulfide CS 2 As the extractant, the scraped sand filter material and the extractant CS 2 Full contact of the solution to make CS 2 Fully dissolve elemental sulfur particles; solid-liquid separation equipment, the extractant CS is separated by filtration 2 Phase separation of solution, sand filter material and shedding biofilm; distillation equipment, temperature 48℃, distillation extractant CS 2 Solution, the elemental sulfur is precipitated, and the extractant is reused; the drying equipment, the temperature is 175°C, the precipitated elemental sulfur is dried for 1 hour to recover the elemental sulfur.

Example Embodiment

[0041] Embodiment 2. Sulfate biological reduction reactor with a sulfate load of 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 baffled reactor ABR, HRT is 0.6d; anaerobic fluidized bed The reactor AFBR and HRT are 0.16d, and the others are the same as in Embodiment 1.

Example Embodiment

[0042] Embodiment 3, sulfate biological reduction reactor, 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 baffled reactor ABR, HRT is 1.0d; anaerobic fluidized bed The AFBR and HRT of the reactor are 0.3d, and the others are the same as in Embodiment 1.
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Description & Claims & Application Information

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