Combined treatment method of polycyclic aromatic hydrocarbon wastewater

Abstract

The invention discloses a combined treatment method for polycyclic aromatic hydrocarbon wastewater, and relates to a wastewater treatment technology. According to the method, the polycyclic aromatic hydrocarbon wastewater is treated by utilizing an ozone and wet oxidation process, so that up-to-standard discharge is realized. According to the treatment method of the polycyclic aromatic hydrocarbon wastewater, the polycyclic aromatic hydrocarbon wastewater is subjected to ozone oxidation pretreatment by using the airlift loop reactor, so that the biodegradability of the polycyclic aromatic hydrocarbon wastewater is improved. And after pretreatment, wet oxidation is carried out by using a micro-channel, and refractory substances are degraded. The polycyclic aromatic hydrocarbon wastewater treatment method effectively solves the problems of discharge and treatment of chemical wastewater, and is high in sewage treatment efficiency, stable in effect and convenient to popularize and use.

Description

technical field

[0001] The invention relates to a method for jointly treating polycyclic aromatic hydrocarbon wastewater by using ozone oxidation and wet oxidation, which belongs to wastewater treatment technology. Background technique

[0002] At present, PAH wastewater is mainly divided into physical methods, chemical methods and biological methods; physical methods mainly include adsorption, coagulation and sedimentation, etc.; chemical methods mainly include different advanced oxidation methods; biological methods mainly include aerobic biological treatment, anaerobic biological treatment, etc. oxygen biological treatment.

[0003] Advanced oxidation mainly includes electrochemical oxidation, photocatalytic oxidation, ozone oxidation, Fenton oxidation and wet oxidation. Among them, the ozone oxidation method refers to the wastewater treatment technology that uses ozone as an oxidant to oxidize the organic matter in the wastewater, which can improve the B / C and the biode...

Examples

Embodiment 1

[0034] (1) Get polycyclic aromatic hydrocarbon wastewater (COD: 23476mg / L, BOD: 2817mg / L, B / C=0.12, content of polycyclic aromatic hydrocarbons=1265mg / L) add in the waste water storage tank and adjust pH to be 1, through The metering pump enters the air-lift loop reactor, in which ozone enters from the air inlet at the bottom of the tower, and a gas splitter is installed at the bottom of the tower, and the wastewater enters the reactor from the downflow area of ​​the reactor. The COD mass ratio is 1:1. The reaction time is 1h.

[0035] (2) The waste water after the reaction flows out from the water outlet at the bottom of the tower, and it is detected by sampling. At this time, the effluent COD=6703mg / L, BOD=1609mg / L, B / C=0.24, and the content of polycyclic aromatic hydrocarbons=690mg / L.

[0036] (3) The wastewater oxidized by ozone enters the microchannel reactor through the metering pump (wherein the structural combination is a-straight channel, b-circular cake type pulse v...

Embodiment 2

[0039] (1) Get polycyclic aromatic hydrocarbon wastewater (COD: 22954mg / L, BOD: 2525mg / L, B / C=0.11, polycyclic aromatic hydrocarbon substance content is 1480mg / L) and add in the waste water storage tank and adjust pH to be 2, through The metering pump enters the air-lift loop reactor, in which ozone enters from the air inlet at the bottom of the tower, and a gas splitter is installed at the bottom of the tower, and the wastewater enters the reactor from the downflow area of ​​the reactor. The COD mass ratio is 1:2. The reaction time is 1.5h.

[0040](2) The waste water after the reaction flows out from the water outlet at the bottom of the tower, and it is detected by sampling. At this time, the effluent COD=6003mg / L, BOD=2041mg / L, B / C=0.34, and the content of polycyclic aromatic hydrocarbons=101mg / L.

[0041] (3) The wastewater oxidized by ozonation enters the microchannel reactor through the metering pump (wherein the structural combination is a-straight channel, c-orthorho...

Embodiment 3

[0044] (1) Get polycyclic aromatic hydrocarbon wastewater (COD: 30279mg / L, BOD: 4239mg / L, B / C=0.14, polycyclic aromatic hydrocarbon substance content is 1585mg / L) and add in the waste water storage tank and adjust pH to be 3, through The metering pump enters the air-lift loop reactor, in which ozone enters from the air inlet at the bottom of the tower, and a gas splitter is installed at the bottom of the tower, and the wastewater enters the reactor from the downflow area of ​​the reactor. The COD mass ratio is 1:3. The reaction time is 2h.

[0045] (2) The waste water after the reaction flows out from the water outlet at the bottom of the tower, and it is detected by sampling. At this time, the effluent COD=6075mg / L, BOD=2005mg / L, B / C=0.33, and the content of polycyclic aromatic hydrocarbons=121mg / L.

[0046] (3) The wastewater after ozone oxidation enters the microchannel reactor through the metering pump (wherein the structural combination is b-round cake type pulse variabl...

technical field

[0001] The invention relates to a method for jointly treating polycyclic aromatic hydrocarbon wastewater by using ozone oxidation and wet oxidation, which belongs to wastewater treatment technology. Background technique

[0002] At present, PAH wastewater is mainly divided into physical methods, chemical methods and biological methods; physical methods mainly include adsorption, coagulation and sedimentation, etc.; chemical methods mainly include different advanced oxidation methods; biological methods mainly include aerobic biological treatment, anaerobic biological treatment, etc. oxygen biological treatment.

[0003] Advanced oxidation mainly includes electrochemical oxidation, photocatalytic oxidation, ozone oxidation, Fenton oxidation and wet oxidation. Among them, the ozone oxidation method refers to the wastewater treatment technology that uses ozone as an oxidant to oxidize the organic matter in the wastewater, which can improve the B / C and the biode...

Examples

Embodiment 1

[0034] (1) Get polycyclic aromatic hydrocarbon wastewater (COD: 23476mg / L, BOD: 2817mg / L, B / C=0.12, content of polycyclic aromatic hydrocarbons=1265mg / L) add in the waste water storage tank and adjust pH to be 1, through The metering pump enters the air-lift loop reactor, in which ozone enters from the air inlet at the bottom of the tower, and a gas splitter is installed at the bottom of the tower, and the wastewater enters the reactor from the downflow area of ​​the reactor. The COD mass ratio is 1:1. The reaction time is 1h.

[0035] (2) The waste water after the reaction flows out from the water outlet at the bottom of the tower, and it is detected by sampling. At this time, the effluent COD=6703mg / L, BOD=1609mg / L, B / C=0.24, and the content of polycyclic aromatic hydrocarbons=690mg / L.

[0036] (3) The wastewater oxidized by ozone enters the microchannel reactor through the metering pump (wherein the structural combination is a-straight channel, b-circular cake type pulse v...

Embodiment 2

[0039] (1) Get polycyclic aromatic hydrocarbon wastewater (COD: 22954mg / L, BOD: 2525mg / L, B / C=0.11, polycyclic aromatic hydrocarbon substance content is 1480mg / L) and add in the waste water storage tank and adjust pH to be 2, through The metering pump enters the air-lift loop reactor, in which ozone enters from the air inlet at the bottom of the tower, and a gas splitter is installed at the bottom of the tower, and the wastewater enters the reactor from the downflow area of ​​the reactor. The COD mass ratio is 1:2. The reaction time is 1.5h.

[0040](2) The waste water after the reaction flows out from the water outlet at the bottom of the tower, and it is detected by sampling. At this time, the effluent COD=6003mg / L, BOD=2041mg / L, B / C=0.34, and the content of polycyclic aromatic hydrocarbons=101mg / L.

[0041] (3) The wastewater oxidized by ozonation enters the microchannel reactor through the metering pump (wherein the structural combination is a-straight channel, c-orthorho...

Embodiment 3

[0044] (1) Get polycyclic aromatic hydrocarbon wastewater (COD: 30279mg / L, BOD: 4239mg / L, B / C=0.14, polycyclic aromatic hydrocarbon substance content is 1585mg / L) and add in the waste water storage tank and adjust pH to be 3, through The metering pump enters the air-lift loop reactor, in which ozone enters from the air inlet at the bottom of the tower, and a gas splitter is installed at the bottom of the tower, and the wastewater enters the reactor from the downflow area of ​​the reactor. The COD mass ratio is 1:3. The reaction time is 2h.

[0045] (2) The waste water after the reaction flows out from the water outlet at the bottom of the tower, and it is detected by sampling. At this time, the effluent COD=6075mg / L, BOD=2005mg / L, B / C=0.33, and the content of polycyclic aromatic hydrocarbons=121mg / L.

[0046] (3) The wastewater after ozone oxidation enters the microchannel reactor through the metering pump (wherein the structural combination is b-round cake type pulse variabl...

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