Device and method for forming and separating elemental sulfur in situ

Abstract

The invention discloses a device and a method for forming and separating elemental sulfur in situ. The device comprises a reaction device and a collection device, wherein a separation membrane is arranged in the reaction device, is of a biological membrane-microfiltration membrane double layer structure and divides the reaction device into a reaction zone and an accumulation zone, a biological membrane is located on the side of the reaction zone, and a microfiltration membrane is located on the side of the accumulation zone; the collection device is divided into a gas collection device and a liquid collection device, the gas collection device collects gas discharged from the reaction device, the liquid collection device collects liquid and solid discharged from the reaction device, the gascollection device is connected to the reaction zone, and the liquid collection device is connected to the accumulation zone. The device introduces a concept of forming and separating solid particlesin situ into a membrane bioreactor, uses water flow pressure to drive elemental sulfur formed on the surface of microorganism to pass through the microfiltration membrane, and collects the elemental sulfur passing through the microfiltration membrane in time, so that no excessive oxidation or reduction of elemental sulfur occurs when sulfide is oxidized to elemental sulfur.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a device and method for forming and separating elemental sulfur in situ. Background technique [0002] With the rapid development of my country's economy, the improvement of public environmental awareness, and the increase of government investment, the total COD discharge of wastewater in China in 2015 decreased by 11.37% compared with 2012, but it was still as high as 21.481 million tons. Among them, a considerable part comes from petroleum refining, papermaking, slaughtering, and pharmaceutical industries. It is inevitable to produce a large amount of wastewater containing sulfate, sulfide, ammonia nitrogen / nitrate in the production process of these industries. If this type of wastewater is not properly treated, it will produce Great harm: (1) Sulfate. Excessive discharge of sulfate will increase the concentration of sulfate in the water. If the water contains high sulfate (>...

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Problems solved by technology

Among them, a considerable part comes from petroleum refining, papermaking, slaughtering, and pharmaceutical industries. It is inevitable to produce a large amount of wastewater containing sulfate, sulfide, ammonia nitrogen / nitrate in the production process of these industries. If this type of wastewater is not properly treated, it will produce Great harm: (1) Sulfate. Excessive discharge of sulfate will increase the concentration of sulfate in the water. If the water contains high sulfate (>400mg / L), there will be a sense of bitterness. If it reaches 1000~ 1200mg / L will cause diarrhea; secondly, the natural environment and wastewater are often rich in a large amount of organic matter, so sulfate is easily reduced to sulfide by sulfate-reducing bacteria, resulting in secondary pollution

(2) Sulfides are polar toxic, corrosive, and foul-smelling. Direct discharge not only affects air quality, but also corrodes drainage pipes and directly poisons organisms in water bodies.

[0004] At present, the activated sludge reaction device in the prior art cannot solve the problem of sulfur overoxidation and overreduction in the process of sulfide oxidation, and requires multiple operating parameters (hydraulic retention time, influent load, ratio between pollutants, etc.) Precise and mutually adjustable, low elemental sulfur formation

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