Acidic high sulfate organic wastewater treatment process and apparatus

Abstract

The present invention discloses an acidic high sulfate organic wastewater treatment process and apparatus. The present invention belongs to the technical field of wastewater treatment. The specific process comprises the steps of: (1) neutralization and precipitation treatment: using lime milk to adjust PH of wastewater, and forming CaSO4 precipitation separated from the water; (2) first-stage anaerobic treatment, entering the first-stage anaerobic treatment after neutralization and precipitation treatment, introducing nitrogen into the bottom of an anaerobic reactor with stirring and blowing off, parsing H2S from an aqueous phase into a gas phase above a liquid level, introducing the H2S in the gas phase to a dry desulfurizer for desulfurization, and re-introducing the sulfur removed nitrogen into the first-stage anaerobic reactor for recycling through a blower; and (3) second-stage anaerobic treatment, introducing the sulfur removed wastewater into a second-stage anaerobic reactor to complete an anaerobic methane production reaction, and taking second-stage anaerobic effluent into an aerobic reaction tank for further processing. According to treatment process disclosed by the present invention, inhibition and toxic effects generated by the SO42- and S2- to the anaerobic biological treatment can be effectively reduced, and sewage treatment effects can be improved.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a treatment process and device for acidic high sulfate organic waste water. Background technique [0002] Acidic high sulfate organic wastewater covers chemical, pharmaceutical, papermaking, food processing, mining and other industries, such as turmeric saponin wastewater, monosodium glutamate wastewater, yeast wastewater, sulfate process papermaking wastewater, antibiotics (penicillin, oxytetracycline, Maddie mold element, etc.) wastewater, acid mine wastewater, some chemical wastewater, etc. The entry of sulfate wastewater into surface water will lead to acidification of the water body, affecting the growth of aquatic organisms; polluting the soil, causing soil compaction, and destroying the ecological balance of the soil; the H produced by sulfate reduction 2 S and other malodorous gases escape from the water body into the atmosphere, causing air pollution. The...

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Problems solved by technology

Due to CaSO 4 Slightly soluble, the removal rate is low, and a large amount of lime residue and sludge are produced;

[0006] (2) Add barium salt to produce BaSO 4 Precipitation, the precipitation effect is good, the removal rate is high, but the barium salt is toxic, and the operating cost is high, the sludge production is large, and it is easy to cause secondary pollution;

[0007] (3) Two-stage anaerobic treatment process is adopted. The first stage of anaerobic reaction is mainly the hydrolytic acidification stage, and the second stage of anaerobic reaction stage is mainly the methanogenic stage. This process can reduce the S 2- and sulfate-reducing bacteria on anaerobic production, but most of the S produced by the system 2- It still exists in sewage, and the treatment effect is limited;

When using air stripping, the oxygen in the air can inhibit anaerobic; when using biogas stripping, the biogas is flammable, explosive and dangerous; using CO 2 During stripping, CO 2 Poor stability, easily soluble in water

The above methods all have some shortcomings and deficiencies in the treatment of acidic high sulfate organic wastewater, and cannot effectively and reliably eliminate SO 4 2- The impact on the anaerobic treatment system limits the anaerobic treatment of high-concentration sulfate wastewater

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