Method for treating heavy metal-containing acidic waste water and recycling heavy metal with biomass fixed bed

Abstract

The invention discloses a method for treating acidic waste water containing heavy metal and reclaiming the heavy metal through a biomass fixed bed, which is characterized in that dry solid biomass capable of being decomposed by microbes is granulated and filled into a container with a supporting layer and a water distributing device so as to form a fixed bed microbe reactor; sewage disposal plant sludge containing sulfate reducing bacteria is taken as the source of microbe bacteria on the fixed bed, and the microbes are cultured, proliferated and acclimated to adapt to the environment of the biomass filler fixed bed through the backflow circulation of the outputted water or taking ferrous sulfate aqueous solution as the inputted water; acid effluent containing heavy metallic ions is led into the fixed bed for direct filtration; and when the water filtering speed can not meet the preset requirements, the operation is stopped, substances in the fixed bed are taken out, the heavy metal is reclaimed through smelting, and the fixed bed microbe reactor is refilled. The method is suitable for waste water containing Cr2O7 <2->, AsO3 <2->, Cu <2+>, Hg <2+> Ag <+>, Cd <2+> and the like. The method can be used for reclaiming the valuable metal resources with low waste water treatment cost.

Description

technical field

[0001] The invention relates to the technical field of environmental protection, in particular to a method for treating acid drainage containing heavy metals and recovering heavy metals. Background technique

[0002] Acidic drainage containing heavy metals comes from mining, metallurgy, electroplating and other industries. Heavy metal-containing acid drainage treatment mainly uses alkaline substances such as lime, carbonate rock, and soda ash to chemically neutralize and hydrolyze precipitation. This treatment method will produce a large amount of sludge, and the content of valuable metals in this type of sedimentation sludge is low. , the recycling process is complicated and the cost is high. When the neutralized sediment sludge cannot be recycled, it is classified as hazardous solid waste and needs to be further disposed of at a high cost. Such high-economic-cost technologies are already under enormous economic pressure. In recent years, research on low-...

Examples

Embodiment 1

[0030] First, the harvested and dried rape straw is made into particles with a length of 20-30mm, and then the processed rape straw particles are filled into a container with a supporting layer and a water distribution device at the bottom to form a fixed-bed microbial reactor. The reactor is made of a PVC pipe with a diameter of 10 cm, a height of 200 cm, and an effective volume of 12 liters.

[0031] Put 1 liter of concentrated sludge from domestic sewage treatment plant into straw fixed-bed reactor, inoculate mixed flora containing sulfate-reducing bacteria as a source of microbial strains, and use ferrous sulfate aqueous solution with a sulfate concentration of 500mg / L as influent, Adjust the water outlet speed of the fixed-bed microbial reactor, keep the hydraulic retention time at 60 hours, cultivate and acclimatize until the oxidation-reduction potential of the outlet water is lower than -150mv.

[0032] Prepare acid drainage with a copper ion concentration of 5-30mg / L,...

Embodiment 2

[0036] Firstly, the dry rice straw is processed into particles with a length of 30-50mm by a shredder, and then the processed rice straw particles are filled into a container with a support layer and a water distribution device at the bottom to form a fixed-bed microbial reactor. The reactor is made of a PVC pipe with a diameter of 10 cm, a height of 200 cm, and an effective volume of 12 liters.

[0037] Add 1 liter of concentrated sludge from a domestic sewage treatment plant into a straw fixed-bed reactor, and inoculate a mixed flora containing sulfate-reducing bacteria as a source of microbial strains.

[0038] Prepare acid drainage with a copper ion concentration of 5-30mg / L, a sulfate radical concentration of 500-1000mg / L, and a pH value of 3, and use a peristaltic pump to feed the prepared acidic water containing heavy metals into the upper part of the fixed-bed microbial reactor in a downflow manner Deal with acidic water. Adjust the flow rate of the peristaltic pump, ...

Embodiment 3

[0044] First, the harvested and dried rape straw is processed into particles with a length of 20-40mm by a shredder, and then the processed rape straw particles are filled into a container with a supporting layer and a water distribution device at the bottom to form a fixed bed of microorganisms reactor. The reactor is made of a PVC pipe with a diameter of 10 cm, a height of 200 cm, and an effective volume of 12 liters.

[0045] Add 1 liter of concentrated sludge from a domestic sewage treatment plant into a straw fixed-bed reactor, and inoculate a mixed flora containing sulfate-reducing bacteria as a source of microbial strains.

[0046] Use the leaching water from the weathering and oxidation of Xinqiao pyrite sulfide ore as the acid drainage water source (copper ion concentration 50-30mg / L, zinc ion concentration 10-15mg / L, cadmium ion concentration 3-10mg / L, iron ion concentration 100 -300mg / L, sulfate radical concentration 1000-2000mg / L, pH value 3-4), use a peristaltic ...

technical field

[0001] The invention relates to the technical field of environmental protection, in particular to a method for treating acid drainage containing heavy metals and recovering heavy metals. Background technique

[0002] Acidic drainage containing heavy metals comes from mining, metallurgy, electroplating and other industries. Heavy metal-containing acid drainage treatment mainly uses alkaline substances such as lime, carbonate rock, and soda ash to chemically neutralize and hydrolyze precipitation. This treatment method will produce a large amount of sludge, and the content of valuable metals in this type of sedimentation sludge is low. , the recycling process is complicated and the cost is high. When the neutralized sediment sludge cannot be recycled, it is classified as hazardous solid waste and needs to be further disposed of at a high cost. Such high-economic-cost technologies are already under enormous economic pressure. In recent years, research on low-...

Examples

Embodiment 1

[0030] First, the harvested and dried rape straw is made into particles with a length of 20-30mm, and then the processed rape straw particles are filled into a container with a supporting layer and a water distribution device at the bottom to form a fixed-bed microbial reactor. The reactor is made of a PVC pipe with a diameter of 10 cm, a height of 200 cm, and an effective volume of 12 liters.

[0031] Put 1 liter of concentrated sludge from domestic sewage treatment plant into straw fixed-bed reactor, inoculate mixed flora containing sulfate-reducing bacteria as a source of microbial strains, and use ferrous sulfate aqueous solution with a sulfate concentration of 500mg / L as influent, Adjust the water outlet speed of the fixed-bed microbial reactor, keep the hydraulic retention time at 60 hours, cultivate and acclimatize until the oxidation-reduction potential of the outlet water is lower than -150mv.

[0032] Prepare acid drainage with a copper ion concentration of 5-30mg / L,...

Embodiment 2

[0036] Firstly, the dry rice straw is processed into particles with a length of 30-50mm by a shredder, and then the processed rice straw particles are filled into a container with a support layer and a water distribution device at the bottom to form a fixed-bed microbial reactor. The reactor is made of a PVC pipe with a diameter of 10 cm, a height of 200 cm, and an effective volume of 12 liters.

[0037] Add 1 liter of concentrated sludge from a domestic sewage treatment plant into a straw fixed-bed reactor, and inoculate a mixed flora containing sulfate-reducing bacteria as a source of microbial strains.

[0038] Prepare acid drainage with a copper ion concentration of 5-30mg / L, a sulfate radical concentration of 500-1000mg / L, and a pH value of 3, and use a peristaltic pump to feed the prepared acidic water containing heavy metals into the upper part of the fixed-bed microbial reactor in a downflow manner Deal with acidic water. Adjust the flow rate of the peristaltic pump, ...

Embodiment 3

[0044] First, the harvested and dried rape straw is processed into particles with a length of 20-40mm by a shredder, and then the processed rape straw particles are filled into a container with a supporting layer and a water distribution device at the bottom to form a fixed bed of microorganisms reactor. The reactor is made of a PVC pipe with a diameter of 10 cm, a height of 200 cm, and an effective volume of 12 liters.

[0045] Add 1 liter of concentrated sludge from a domestic sewage treatment plant into a straw fixed-bed reactor, and inoculate a mixed flora containing sulfate-reducing bacteria as a source of microbial strains.

[0046] Use the leaching water from the weathering and oxidation of Xinqiao pyrite sulfide ore as the acid drainage water source (copper ion concentration 50-30mg / L, zinc ion concentration 10-15mg / L, cadmium ion concentration 3-10mg / L, iron ion concentration 100 -300mg / L, sulfate radical concentration 1000-2000mg / L, pH value 3-4), use a peristaltic ...

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