Preparation and application of an enhanced sulfate reduction composite bacteria-embedded bioactive filler

Abstract

The invention relates to the preparation and application of an enhanced sulfate reduction compound bacteria-embedded bioactive filler, which belongs to the field of wastewater treatment. Including directional culture enhancement of sulfate-reducing compound bacteria, embedding raw material composition: PVA 20-30%; sulfate-reducing bacteria culture 50%; diatomite 15-20%; 100-mesh wood activated carbon 4-6%; calcium carbonate 4‑5%; the remaining 1% is an inorganic mixture, prepared as a colloidal investment; extruded tube strips, glued in saturated boric acid solution for 4 hours, cleaned, cut, placed in 5% sodium sulfate Soaking in the solution was carried out for 4 hours to form the final embedded filler product. The formation of this technical method has brought more favorable technical basic conditions for the production and application of embedded bioactive fillers.

Description

Technical field:

[0001] The invention belongs to the field of waste water treatment, and in particular relates to the preparation and application of sulfate-reducing compound bacterial culture and embedding bioactive filler. Background technique:

[0002] High-concentration sulfate content has always been a typical feature of industrial production, especially the wastewater produced by heavy metal mining and metal smelting enterprises. The wastewater produced by heavy metal mining and metal smelting enterprises also contains a large amount of heavy metals.

[0003] Sulfate-Reducing Bacteria (SRB), which have the S +6 Revert to S -2 The ability, once the sulfur is reduced, it can be oxidized to S by sulfur oxidizing bacteria 0 , and then through coagulation and sedimentation technology, it is separated from the wastewater. Through this process, not only sulfate can be removed, but also elemental S can be recovered. Sulphate wastewater containing heavy metals can also be re...

Examples

Embodiment 1

[0020] 1. Preparation of filler (1)

[0021] Oriented cultivation and strengthening of sulfate-reducing compound bacteria: take the sediment from the heavy metal sulfate wastewater storage tank, concentrate the sediment to a water content of 97%, and add it to the culture tank for sulfate-reducing bacteria. The volume is about 1 / 3 of the effective volume of the culture tank ; Under the low-intensity stirring condition of 80n / min, the water temperature is 28±2°C, and artificially prepared sulfate wastewater is added. As the concentration of sulfate in the culture tank decreases, the amount of sulfate input is continuously increased; the electron donor organic matter required for the reaction is preferably sodium lactate, and the dosage is controlled to be twice the molar amount of sulfate reduction; in this state, the detection of mixed Sulfate concentration in the culture solution; pH control at 7.5-8.5; add trace element solution 5mL / L (trace element solution composition: ZnS...

Embodiment 2

[0027] 1. Sulfate-reducing bacteria culture culture and filler preparation (same as example 1)

[0028] 2. Application of sulfate reduction embedded active filler (copper mining and smelting mixed wastewater)

[0029] Set up a reactor with an effective volume of 4000L, add 4000 sulfate reducing filler balls prepared in 1., and finally form a sulfate reducing bacteria-embedded bioactive filler with a filling rate of 20%, water temperature of 28±2°C, HRT= 8h , the pH is 8.0±0.5, the reactor feed water is copper mining and smelting wastewater, and the sulfate content is 6500-8200mg / L. The electron donor organic matter required for the reaction is sodium lactate, and the dosage is controlled to be twice the amount of sulfate reduction. A water reflux pump is installed at the end of the reactor, and the reaction liquid flows back from the end to the water inlet of the reactor (the purpose of this part is to stabilize the pH of the reactor), and the reflux ratio is 80% of the water...

Technical field:

[0001] The invention belongs to the field of waste water treatment, and in particular relates to the preparation and application of sulfate-reducing compound bacterial culture and embedding bioactive filler. Background technique:

[0002] High-concentration sulfate content has always been a typical feature of industrial production, especially the wastewater produced by heavy metal mining and metal smelting enterprises. The wastewater produced by heavy metal mining and metal smelting enterprises also contains a large amount of heavy metals.

[0003] Sulfate-Reducing Bacteria (SRB), which have the S +6 Revert to S -2 The ability, once the sulfur is reduced, it can be oxidized to S by sulfur oxidizing bacteria 0 , and then through coagulation and sedimentation technology, it is separated from the wastewater. Through this process, not only sulfate can be removed, but also elemental S can be recovered. Sulphate wastewater containing heavy metals can also be re...

Examples

Embodiment 1

[0020] 1. Preparation of filler (1)

[0021] Oriented cultivation and strengthening of sulfate-reducing compound bacteria: take the sediment from the heavy metal sulfate wastewater storage tank, concentrate the sediment to a water content of 97%, and add it to the culture tank for sulfate-reducing bacteria. The volume is about 1 / 3 of the effective volume of the culture tank ; Under the low-intensity stirring condition of 80n / min, the water temperature is 28±2°C, and artificially prepared sulfate wastewater is added. As the concentration of sulfate in the culture tank decreases, the amount of sulfate input is continuously increased; the electron donor organic matter required for the reaction is preferably sodium lactate, and the dosage is controlled to be twice the molar amount of sulfate reduction; in this state, the detection of mixed Sulfate concentration in the culture solution; pH control at 7.5-8.5; add trace element solution 5mL / L (trace element solution composition: ZnS...

Embodiment 2

[0027] 1. Sulfate-reducing bacteria culture culture and filler preparation (same as example 1)

[0028] 2. Application of sulfate reduction embedded active filler (copper mining and smelting mixed wastewater)

[0029] Set up a reactor with an effective volume of 4000L, add 4000 sulfate reducing filler balls prepared in 1., and finally form a sulfate reducing bacteria-embedded bioactive filler with a filling rate of 20%, water temperature of 28±2°C, HRT= 8h , the pH is 8.0±0.5, the reactor feed water is copper mining and smelting wastewater, and the sulfate content is 6500-8200mg / L. The electron donor organic matter required for the reaction is sodium lactate, and the dosage is controlled to be twice the amount of sulfate reduction. A water reflux pump is installed at the end of the reactor, and the reaction liquid flows back from the end to the water inlet of the reactor (the purpose of this part is to stabilize the pH of the reactor), and the reflux ratio is 80% of the water...

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