Treating method for reverse osmosis (RO) concentrated water

A reverse osmosis concentrated water and treatment method technology, which is applied in the field of reverse osmosis concentrated water treatment, can solve problems such as limited processing capacity and limited application range, and achieve the effects of solving difficult removal problems, improving treatment effect, and efficient removal

Active Publication Date: 2018-06-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This type of method mainly relies on denitrification to remove nitrite to deal with COD, the t

Method used

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  • Treating method for reverse osmosis (RO) concentrated water

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Embodiment 1

[0024] The preparation method of embodiment 1 microbial bacterial agent

[0025] (1) Inoculate Paracoccus FSTB-2, Microbacterium Kitami FSTB-4 and Pseudomonas stutzeri FSTB-5 on FSTB solid medium for activation respectively; denitrifying Paracoccus DN-3 and A Bacteria SDN-3 were respectively inoculated on the corresponding solid medium for activation; spread evenly and placed in a constant temperature incubator at 35°C for activation.

[0026] (2) Use the inoculation loop to inoculate the colonies of Paracoccus FSTB-2, Kitamibacterium FSTB-4 and Pseudomonas stutzeri FSTB-5 on the plate into the corresponding FSTB liquid medium respectively, and use the inoculation loop to Take the colonies of Paracoccus denitrificans DN-3 and Methylobacterium SDN-3 on the plate and inoculate them in the corresponding liquid medium respectively, and culture them with shaking at 30°C and 150rpm for 48 hours to the logarithmic growth phase to obtain liquid bacteria agent seed liquid.

[0027] (...

Embodiment 2

[0034] The RO concentrated water produced by a refinery company has a COD of 100mg / L, a total nitrogen of 80mg / L, a salt concentration of 5000mg / L, and a B / C ratio of less than 0.1. Treated by the method of the present invention, the sewage first enters the ozone catalytic oxidation unit, and the catalyst prepared by the embodiment 1 in CN201310621081.2 is used to load the reactor, the loading amount is 1 / 3 of the reactor volume, and the test conditions are: volumetric space velocity 0.5 h -1 ;O 3 Concentration 50g / m 3 , O 3 The dosage is 2000mg / L. The B / C ratio of the effluent from the ozone catalytic oxidation unit was increased to 0.7. Sewage after ozone oxidation enters the buffer tank to remove the remaining ozone. Then, according to the designed water volume, it enters the bio-enhanced treatment unit and is treated by three sets of alternately operating SBR processes. The operating time of a single set of SBR is 8 hours, aeration is 2 hours, stirring is 1 hour, circ...

Embodiment 3

[0036] The RO concentrated water produced by a refinery company has a COD of 300mg / L, a total nitrogen of 150mg / L, a salt concentration of 5000mg / L, and a B / C ratio of less than 0.1. Treated by the method of the present invention, the sewage first enters the ozone catalytic oxidation unit, and the catalyst prepared by the embodiment 1 in CN201310621081.2 is used to load the reactor, the loading amount is 1 / 3 of the reactor volume, and the test conditions are: volumetric space velocity 0.5 h -1 ;O 3 Concentration 70g / m 3 , O 3 The dosage is 3000mg / L. The effluent B / C of the ozone catalytic oxidation unit was increased to 0.8. Sewage after ozone oxidation enters the buffer tank to remove the remaining ozone. Then, according to the designed water volume, it enters the bio-enhanced treatment unit, and is treated by two sets of alternately operating SBR processes. The operating time of a single set of SBR is 12 hours, aeration is 3 hours, stirring is 2 hours, circulation is tw...

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Abstract

The invention relates to a treating method for RO concentrated water. The treating method mainly comprises the following steps: (1) treatment with an advanced oxidation unit: subjecting RO concentrated water to advanced oxidation to improve the biodegradability of the RO concentrated water; and (2) biologically strengthened treatment: allowing the RO concentrated water having undergone advanced oxidation to enter a biologically strengthened treatment unit, and adding a salt-tolerant COD-removing denitrifying microbial agent into a treatment system, wherein the microbial agent comprises at least one selected from a group consisting of Paracoccus sp. FSTB-2, Microbacterium kitamiense FSTB-4 and Pseudomonas stutzeri FSTB-5, and further comprises at least one selected from a group consisting of Paracoccus denitrificans DN-3 and Methylobacterium phyllosphaerae SDN-3. The treating method of the invention adopts a combination of an advanced oxidation treatment process and a biologically strengthened treatment process, and the salt-tolerant microbial agent is added into the biologically strengthened treatment unit, so COD and total nitrogen in the RO concentrated water are both removed efficiently, and effluent meets emission requirements.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a treatment method for reverse osmosis concentrated water. Background technique [0002] The reverse osmosis technology (RO), which is widely used in the advanced treatment and reuse of industrial wastewater, not only produces pure reuse water, but also produces concentrated water with a high concentration of pollutants. The concentrated water usually accounts for 1% of the recycled water. / 3. The COD of this kind of wastewater generally exceeds the discharge standard and cannot be discharged directly. In the process of wastewater reuse in the oil refining industry, the COD of the concentrated water produced by reverse osmosis treatment is generally about 200mg / L, the total nitrogen is about 100mg / L, the petroleum is about 10mg / L, and the TDS (total dissolved solids) ≥ 5000mg / L L and B / C are relatively low, which makes the concen...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/72C02F3/34
CPCC02F1/72C02F1/722C02F1/725C02F1/78C02F3/34C02F9/00
Inventor 高会杰郭志华孙丹凤赵胜楠陈明翔
Owner CHINA PETROLEUM & CHEM CORP
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