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Method for removing sulphur and nitrogen in inorganic waste water synchronously

A technology for the removal of inorganic wastewater, which is applied in the direction of anaerobic digestion and treatment, can solve the problems of high energy consumption, high operating costs, secondary pollution, etc., and achieve high treatment efficiency, small floor space, and low sludge yield Effect

Active Publication Date: 2008-11-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the disadvantages of high energy consumption, high operating cost and easy to cause secondary pollution in the existing process for removing sulfur and nitrogen in inorganic wastewater; and to provide a method for synchronously removing sulfur and nitrogen in wastewater

Method used

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  • Method for removing sulphur and nitrogen in inorganic waste water synchronously
  • Method for removing sulphur and nitrogen in inorganic waste water synchronously
  • Method for removing sulphur and nitrogen in inorganic waste water synchronously

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specific Embodiment approach 1

[0011] Specific embodiment one: the method for synchronously removing sulfur and nitrogen in the inorganic waste water in the present embodiment is carried out according to the following steps: one, in the sealed reactor, add anaerobic activated sludge and filler, pass into nutrient solution then Perform bio-filming on the filler, keep the pH value of the culture solution at 7.5-8.3, replace the nutrient solution every 12-24 hours, and complete the bio-filming when the sulfate removal rate reaches 80%; 2. Pass the inorganic waste water into reactor, while adding an organic carbon source to the influent to make COD and SO 4 2- The mass concentration ratio is 1.7~2.1:1, the sulfate in the inorganic wastewater in the biofilm is converted into sulfide, the sulfide diffuses on the surface of the biofilm to be oxidized into elemental sulfur, and the nitrate is denitrified into nitrogen, the process operation Conditions: the reaction temperature is 25°C to 35°C, the pH value is 7.5 ...

specific Embodiment approach 2

[0017] Embodiment 2: This embodiment differs from Embodiment 1 in that: the filler is corncob particles, and the particle diameter of the corncob particles is 3-5 mm. Others are the same as in the first embodiment.

[0018] Compared with other types of fillers, corncob fillers have a rough surface and a large specific surface area, which is suitable for microbial attachment, and the price of corncob fillers is low, reducing operating costs.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the reactor in Step 1 is an anaerobic film-attached expanded bed reactor. Others are the same as in the first embodiment.

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Abstract

The invention provides a method for synchronously removing sulfur and nitrogen in inorganic wastewater, relating to the method for treating the inorganic wastewater. The method overcomes the defects of complicated process, high energy consumption, high cost and easily caused secondary pollution in the prior process for removing the sulfur and the nitrogen in the inorganic wastewater. The method comprises the following steps of: 1. adding anaerobic activated sludge into a reactor for biofilm formation, or for cultivating granular sludge; 2. feeding the inorganic wastewater into the reactor, and adding an organic carbon source into the wastewater, so that sulfate in wastewater in a biofilm or in the granular sludge is transformed into sulfide, the surface of the sulfide diffusion biofilm or the surface of the granular sludge is oxidized into elemental sulfur, and nitrate in the wastewater is denitrified into nitrogen; 3. discharging the wastewater which is treated via the second step, and separating and recycling suspended particles of the elemental sulfur; therefore, synchronous removal of the sulfur and the nitrogen in the inorganic wastewater can be completed. The method has the advantages of simple process, convenient operation, high treatment efficiency, no secondary pollution, occupied area reduction, low operating cost, low sludge yield and small energy consumption.

Description

technical field [0001] The present invention relates to a method for treating inorganic waste water. Background technique [0002] With the rapid development of industries such as mining and thermal power plants, the discharge of a large amount of inorganic sulfur- and nitrogen-containing wastewater has become a major threat to the environment. Sulfur compounds can be reduced to sulfides by microorganisms under anaerobic conditions, which not only cause biological corrosion, but also produce toxic and harmful hydrogen sulfide gas, which brings great harm to people's production and life; It will over-digest the dissolved oxygen in the water, causing aquatic organisms to die without enough dissolved oxygen, thus destroying the water ecosystem; in addition, it will also destroy the soil structure and cause soil compaction. The discharge of nitrogen-containing wastewater into the water body will cause eutrophication of the water body, resulting in algal blooms, red tides and ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 王爱杰刘春爽任南琪韩洪军陈川
Owner HARBIN INST OF TECH
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