In-situ upgraded treatment method for realizing zero discharge of refinery and chemical wastewater and biological stuffing used in in-situ upgraded treatment method

A technology for in-situ upgrading and refining sewage, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of reducing the treatment effect of oil refining sewage below 5mg/L Difficulty in showing, gathering, etc.

Active Publication Date: 2014-07-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose of using fillers is to increase the microbial biomass per unit volume of the biochemical pool. The physical properties of the fillers such as shape, structure, porosity, and chemical properties such as hydrophilicity directly affect the attachment of microbial films to the fillers, thereby affecting the sewage treatment effect; for One of the main problems found in the experimental application of existing biological fillers is that it is difficult for microorganisms to form obvious biofilms on the surface of fillers, so it is difficult to enhance the effect of refining wastewater treatment, which is different from domestic sewage or other The middle and high concentration sewage that is easier to degrade is significantly different
In addition, the filling method (such as fixed bed, suspended or fluidized bed) of the filler in the biological treatment structure (aeration tank) also has an important impact on the sewage treatment results. Biofluidized packing, however, for most of the biological treatment units whose structures are mainly corridor structures, the biofluidized packing may gather along the direction of water flow, how to achieve uniform fluidization of the biofluidized packing in the corridor type biological treatment structure, is also a problem with the technology
In general, the COD of refinery sewage can be guaranteed to reach 60-100mg / L and ammonia nitrogen to 5-15mg / L after being treated by the current biological treatment unit, but it is still difficult to reduce the COD of biochemical effluent to below 50mg / L. Ammonia nitrogen drops below 5mg / L
If you want to lower the COD and ammonia nitrogen values ​​of the effluent, you need to build a new advanced treatment structure on the basis of the biochemical treatment process. no floor plans available

Method used

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  • In-situ upgraded treatment method for realizing zero discharge of refinery and chemical wastewater and biological stuffing used in in-situ upgraded treatment method
  • In-situ upgraded treatment method for realizing zero discharge of refinery and chemical wastewater and biological stuffing used in in-situ upgraded treatment method
  • In-situ upgraded treatment method for realizing zero discharge of refinery and chemical wastewater and biological stuffing used in in-situ upgraded treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The modified polyurethane fluidized filler in Comparative Example 1 was replaced with the activated carbon modified polypropylene cylindrical hollow three-dimensional filler of the present invention. Activated carbon (specific surface area 1300m 2 / g, particle size 300-400 mesh) accounts for 3% of the mass percentage of polypropylene, and 0.1% of 1-3mm acrylic fiber is added. The filler after molding is a hollow cylindrical structure with two layers inside and outside, and the diameter of the inner cylinder is 1.2 cm, the diameter of the outer cylinder is 2.5cm, the inner and outer cylinders are connected by 8 edges, and the density of the hollow cylindrical filler is 0.98g / cm 3 , the specific surface area is about 800m 2 / m 3 . Place the hollow three-dimensional filler in a rectangular stainless steel mesh cage with a specification of 950mm×1400mm×2500mm. The mesh of the stainless steel mesh cage is 1cm×1cm, and the filler dosage accounts for 30% of the cage volume....

Embodiment 2

[0087] The three-dimensional hollow filler cage in embodiment 1 is changed into alternately discharged hollow filler cage and modified polyurethane filler cage (polyurethane foam filler, hollow filler are respectively identical with aforementioned comparative example 2 and embodiment 1), that is, each The biochemical pool discharges fillers in the following order: modified polyurethane filler cage - three-dimensional hollow filler cage - modified polyurethane filler cage - three-dimensional hollow filler cage. The packing amount of each mesh cage is 30% of the mesh cage volume, and the size and specifications of the mesh cage and other operating parameters etc. are all the same as in Example 1.

[0088] After stable operation, the effluent water quality indicators of each process section are shown in Table 4. It can be seen that after adopting the above two kinds of modified biological fillers and uniform fluidized distribution of fillers, the COD, ammonia nitrogen and total n...

Embodiment 3

[0092] The fillers of the filler cages in Example 2 are increased by 10%, that is, the filler dosage is about 40% of the water volume of the biochemical tank, the reflux ratio of the mixed liquid in the aeration tank is 200%, and the sludge reflux ratio is 40%. Other conditions and implementation The same as Example 2, the effluent water quality indicators of each process section after stable operation are shown in Table 5. It can be seen that after the filler is increased from 30% to 40%, the control of effluent COD and ammonia nitrogen is further improved, but the effect is not obvious.

[0093] Table 5 Concentration of pollutants in each stage of in-situ upgrading treatment process of oil refinery wastewater (mg / L)

[0094]

[0095] Through the above method for treating oil refining sewage of the present invention, without changing the original structure of the sewage treatment plant, by changing the operating process, and adopting the modified biological filler of the p...

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Abstract

The invention relates to an in-situ upgraded treatment method for realizing zero discharge of refinery and chemical wastewater and particularly relates to an upgraded treatment process for treating refinery and chemical wastewater by using an activated sludge process and a hydrolytic acidification-activated sludge process and an implementing method of the upgraded treatment process. According to the method provided by the invention, the existing refinery and chemical wastewater treatment structure is adopted, and specific hollow three-dimensional stuffing and polyurethane foam stuffing are filled in a corridor biological reaction tank for biological membrane hydrolytic acidification and biological membrane contact oxidation, so that operation process parameters are regulated, and a biological membrane-activated sludge symbiotic A / O (anaerobic / aerobic) wastewater treatment process is formed. The method has the advantages that the number of the wastewater treatment structure is not increased, and the in-situ upgraded treatment method is suitable for upgrading and modifying the traditional wastewater treatment system, stable in effluent quality and high in COD (chemical oxygen demand) (namely CODcr, same as follows) as well as ammonia nitrogen and total nitrogen removal ratio, wherein the COD of effluent is less than 50mg / L, the ammonia nitrogen content is less than 5mg / L and the total nitrogen content is less than 20mg / L, so that the upgraded discharge standard requirement is met.

Description

technical field [0001] The invention relates to a method for treating sewage, in particular to a method for in-situ upgrading and discharge treatment of refinery sewage and a biological filler used in the method. Background technique [0002] At present, my country's refinery sewage treatment mainly adopts the "old three sets" of oil separation-air flotation-biochemical-filtration process, among which, the biochemical treatment mainly adopts ordinary activated sludge method and activated sludge-based hydrolysis acidification-contact oxidation process (A / O process), a small number of new sewage treatment plants have adopted the biofilm treatment process. Biofilm treatment process is a general term for a large class of biological treatment methods, including biofilm hydrolysis acidification, contact oxidation, aerated biological filter, MBR, etc., and its common feature is that microorganisms attach and grow on the surface of the filler to form biofilm. With the biofilm treatm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/10
CPCY02W10/10
Inventor 陈进富陈怡崔文峰任立鹏李洪莉田艳荣赵立军郭春梅
Owner BC P INC CHINA NAT PETROLEUM CORP
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