Deep treatment technology and device for non-biodegradable wastewater

Abstract

The invention belongs to the technical field of wastewater treatment, in particular to a deep treatment technology for non-biodegradable wastewater. The deep treatment technology comprises the following steps: step 1: carrying out ozone and ultrasound cooperative oxidization treatment; step 2: carrying out biochemical treatment. A deep treatment device for the non-biodegradable wastewater comprises an ozone gas dissolving device, an ozone generator, an ultrasonic reactor, an ozone reactor and a CBR biofilm reaction cell, which are arranged in sequence. According to the deep treatment technology and the deep treatment device, an ozone and ultrasound cooperative oxidization technology and a CBR biochemical treatment technology are coupled, so that the ozone treatment cost can be reduced andozone can be utilized at maximum, and the optimal treatment effect of the non-biodegradable wastewater is realized; meanwhile, hazardous waste including sludge and the like are not generated and secondary pollution to the environment is not caused; the implementation cost of the technology is relatively low and the water quality of output water is good, so that the deep treatment technology and the deep treatment device are suitable for popularization and application.

Description

technical field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an advanced treatment process and device for non-biodegradable wastewater or tail water (collectively referred to as non-biodegradable wastewater). Background technique

[0002] The biodegradable wastewater after biochemical treatment has almost no biodegradability, especially the effluent of chemical wastewater biochemical treatment, the general COD concentration is 50-300mg / L, and the residual pollutants are basically biodegradable organic substances. At present, for the direct discharge of wastewater treatment facilities in chemical industry or chemical industry parks, the discharge standard generally requires Class I A, that is, COD is lower than 50mg / L, and some even require COD to be lower than 30mg / L to be discharged. At present, the treatment methods for this kind of biodegradable wastewater mainly include advanced oxidation (such as ozone oxidati...

Examples

Embodiment 1

[0017] The COD of the effluent after biochemical treatment in a centralized sewage treatment plant in a chemical industry park is as high as 200-300mg / L (BOD is less than 5 mg / L, which is not biodegradable), and the following treatment is carried out:

[0018] Step 1: Ozone ultrasonic synergistic oxidation treatment: non-biodegradable wastewater flows into the water inlet of the gas dissolver, and the ozone gas generated by the ozone generator enters the wastewater to be treated through the ozone inlet hole of the gas dissolver, and is fully mixed with the wastewater. Control the proportional relationship between the dosage of ozone and the amount of COD required to degrade, referred to as the O / C ratio, to control the dosage of ozone, and the O / C ratio is controlled at 2mgO 3 / mgCOD; then the wastewater dissolved with ozone gas is discharged from the diffusion section of the gas dissolver and enters the ultrasonic reactor (liquid whistle or reed ultrasonic generator), under th...

Embodiment 2

[0022] Such as figure 1 As shown, the advanced treatment device of a kind of biodegradable wastewater described in this embodiment includes an ozone reactor 1, an air dissolver 4, an ultrasonic generator 6 and a CBR biofilm reaction tank 2, and the air dissolver 4 and Ozone generator 3, water inlet pump, ultrasonic generator 6 are connected, and ultrasonic generator 6 is connected with ozone reactor 1, as figure 2 As shown, the gas dissolver 4 includes an inlet section 4-1, a contraction section 4-2, a throat 4-3 and a diffusion section 4-4, and an ozone inlet hole is provided at the throat 4-3 of the gas dissolver 4 5. The ozone inlet hole 5 is connected to the ozone generator 3; the inlet of the inlet section 4-1 of the gas dissolver 4 is connected to the water inlet pump, and the outlet of the diffuser section 4-4 of the gas dissolver 4 is connected to the liquid whistle ultrasonic generator 6 connection; the water outlet end of the ozone reactor 1 is connected with the w...

technical field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an advanced treatment process and device for non-biodegradable wastewater or tail water (collectively referred to as non-biodegradable wastewater). Background technique

[0002] The biodegradable wastewater after biochemical treatment has almost no biodegradability, especially the effluent of chemical wastewater biochemical treatment, the general COD concentration is 50-300mg / L, and the residual pollutants are basically biodegradable organic substances. At present, for the direct discharge of wastewater treatment facilities in chemical industry or chemical industry parks, the discharge standard generally requires Class I A, that is, COD is lower than 50mg / L, and some even require COD to be lower than 30mg / L to be discharged. At present, the treatment methods for this kind of biodegradable wastewater mainly include advanced oxidation (such as ozone oxidati...

Examples

Embodiment 1

[0017] The COD of the effluent after biochemical treatment in a centralized sewage treatment plant in a chemical industry park is as high as 200-300mg / L (BOD is less than 5 mg / L, which is not biodegradable), and the following treatment is carried out:

[0018] Step 1: Ozone ultrasonic synergistic oxidation treatment: non-biodegradable wastewater flows into the water inlet of the gas dissolver, and the ozone gas generated by the ozone generator enters the wastewater to be treated through the ozone inlet hole of the gas dissolver, and is fully mixed with the wastewater. Control the proportional relationship between the dosage of ozone and the amount of COD required to degrade, referred to as the O / C ratio, to control the dosage of ozone, and the O / C ratio is controlled at 2mgO 3 / mgCOD; then the wastewater dissolved with ozone gas is discharged from the diffusion section of the gas dissolver and enters the ultrasonic reactor (liquid whistle or reed ultrasonic generator), under th...

Embodiment 2

[0022] Such as figure 1 As shown, the advanced treatment device of a kind of biodegradable wastewater described in this embodiment includes an ozone reactor 1, an air dissolver 4, an ultrasonic generator 6 and a CBR biofilm reaction tank 2, and the air dissolver 4 and Ozone generator 3, water inlet pump, ultrasonic generator 6 are connected, and ultrasonic generator 6 is connected with ozone reactor 1, as figure 2 As shown, the gas dissolver 4 includes an inlet section 4-1, a contraction section 4-2, a throat 4-3 and a diffusion section 4-4, and an ozone inlet hole is provided at the throat 4-3 of the gas dissolver 4 5. The ozone inlet hole 5 is connected to the ozone generator 3; the inlet of the inlet section 4-1 of the gas dissolver 4 is connected to the water inlet pump, and the outlet of the diffuser section 4-4 of the gas dissolver 4 is connected to the liquid whistle ultrasonic generator 6 connection; the water outlet end of the ozone reactor 1 is connected with the w...

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