CN116217018B - Oily wastewater treatment process - Google Patents
Oily wastewater treatment process Download PDFInfo
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- CN116217018B CN116217018B CN202310504778.5A CN202310504778A CN116217018B CN 116217018 B CN116217018 B CN 116217018B CN 202310504778 A CN202310504778 A CN 202310504778A CN 116217018 B CN116217018 B CN 116217018B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 36
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 16
- 238000005336 cracking Methods 0.000 claims abstract description 37
- 239000002351 wastewater Substances 0.000 claims abstract description 37
- 239000010802 sludge Substances 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 27
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 27
- 230000003647 oxidation Effects 0.000 claims abstract description 21
- 230000020477 pH reduction Effects 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 230000007062 hydrolysis Effects 0.000 claims description 16
- 238000006460 hydrolysis reaction Methods 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 14
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 239000013049 sediment Substances 0.000 claims description 5
- 238000007605 air drying Methods 0.000 claims description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 29
- 238000005097 cold rolling Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention relates to the field of wastewater treatment, and particularly discloses an oily wastewater treatment process which comprises the steps of adjusting, mixing, ultrafiltering, cracking, air floatation, oxidation and hydrolytic acidification, wherein the pH is adjusted to 6-8 by utilizing residual sludge generated in a hydrolytic acidification tank to realize a preliminary demulsification effect, meanwhile, the biodegradability of wastewater is improved, concentrated water of an ultrafiltration system and/or a multistage filter is conveyed to a cracking tank, the sludge adsorbed with oil drops is cracked under the action of high temperature, and meanwhile, the high temperature promotes the collision of the oil drops in water to form large oil drops, so that the subsequent separation of oil and wastewater is more facilitated, and the load of the subsequent treatment air floatation process is reduced.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to an oily wastewater treatment process.
Background
A large amount of oily wastewater can be generated in the cold rolling treatment process of steel enterprises, the highest oil content of the wastewater can reach 20-40g/L, and the wastewater has the characteristics of large water quality change range, poor biodegradability and the like, so that the cold rolling oily wastewater is wastewater with great treatment difficulty. Along with the continuous improvement of the water treatment technology, combined treatment technologies such as electrocatalytic oxidation, ultrafiltration, nanofiltration and the like are developed, and the quality of effluent is greatly improved. However, as the national pollutant emission indexes of iron and steel enterprises are increasingly strict and standard, the running cost of the existing process is extremely high in daily running, meanwhile, the treated effluent cannot meet the pollutant emission standard of the current iron and steel industry, and a plurality of bottleneck problems of pollution system water quality and the like exist in internal recycling, so that the production and sustainable development of high-quality products of the iron and steel enterprises are severely restricted.
CN104118949a discloses a cold rolling wastewater treatment process, which utilizes a multi-medium filter, an ozone contact reaction tower, an intermediate water tank and a biological activated carbon filter tank to carry out advanced treatment on the cold rolling wastewater; CN112408716a discloses a method for treating cold rolling wastewater, which comprises the steps of removing impurities and oil from the cold rolling wastewater, performing ozone catalytic oxidation and desalting, and sequentially performing reverse osmosis, biological oxidation and second ozone catalytic oxidation to obtain purified water. However, the oil content in the wastewater is not recovered in the treatment process of the method, and the wastewater is oxidized by using an advanced oxidation technology, so that the usage amount of the oxidant is excessive, the treatment cost is high, and the large-scale popularization is difficult.
CN104743748A discloses a process for treating high-concentration sewage of oil refining wastewater, which uses air floatation to adsorb organic pollutants and greasy dirt in the sewage, uses activated sludge to adsorb the organic pollutants and greasy dirt, and then performs hydrolytic acidification treatment, so that the oil content in the wastewater after the activated sludge is adsorbed can be greatly reduced. Therefore, the development of a high-efficiency oil-containing wastewater advanced treatment process realizes the treatment method for reutilizing oil-containing wastewater resources, can save water resources for iron and steel enterprises, particularly iron and steel enterprises in water-deficient areas, and has great significance for improving the water environment of the iron and steel enterprises and realizing water conservation and emission reduction.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an oily wastewater treatment process, which utilizes the mixing process of activated sludge and wastewater in an adjusting tank to adsorb oil, and then carries out ultrafiltration, cracking, air floatation, biochemistry and other processes on the wastewater, so that the oil in the wastewater can be recovered and recovered, and the energy consumption and the medicine consumption of wastewater treatment can be greatly reduced.
To achieve the above object, an embodiment of the present invention provides an oily wastewater treatment process, including:
(1) And (3) adjusting: conveying the oily wastewater to a regulating tank, adding acid sludge into the regulating tank, wherein the acid sludge is surplus sludge generated in a hydrolysis acidification tank, and regulating the pH to 6-8;
(2) Mixing: delivering the wastewater in the regulating tank to a mixing tank for mixing, and adding dried sludge into the mixing tank, wherein the adding amount of the dried sludge is 30-60g/L;
(3) Ultrafiltration: conveying the supernatant in the mixing tank to an ultrafiltration system, wherein the ultrafiltration system adopts a plate-frame ultrafiltration system, and the effluent of the ultrafiltration system is conveyed to a biochemical system;
(4) Cracking: delivering concentrated solution produced by the ultrafiltration system to a cracking tank for cracking, wherein the cracking tank is Wen Pojie tank high, high-temperature steam or high-temperature flue gas is added into the high-temperature cracking tank, and waste gas produced in the high-temperature cracking tank is subjected to waste gas treatment;
(5) Air floatation: conveying mixed liquid generated by the high-temperature cracking tank to an air floatation tank, wherein a skimming machine is arranged on the air floatation tank for skimming, the scum collected by the skimming machine is conveyed to a residue filtering machine, waste liquid filtered by the residue filtering machine is conveyed to a regeneration tank for extraction and regeneration treatment, and effluent of the air floatation tank is conveyed to the biochemical system;
(6) Oxidizing: conveying sediment generated by the air floatation tank to a filter press for filter pressing treatment, conveying filter press effluent to an oxidation tank for oxidation treatment, and conveying mud cakes generated by the filter press to an incinerator for incineration;
(7) Hydrolysis acidification: delivering the effluent of the oxidation pond to a hydrolysis acidification pond, and delivering the effluent of the hydrolysis acidification pond to the biochemical system;
in one or more embodiments of the present invention, the oil residue obtained by the residue filter is transported to the incinerator for incineration;
in one or more embodiments of the invention, the mixing tank sediment is collected and transported to a cracking tank for cracking;
in one or more embodiments of the present invention, the dried sludge added in the mixing tank is obtained by air-drying the surplus sludge generated by the biochemical system;
in one or more embodiments of the invention, the high temperature steam or high temperature flue gas temperature delivered by the cracking tank is 150-300 ℃;
in one or more embodiments of the present invention, the biochemical system sequentially sets an AO process and an MBR process;
in one or more embodiments of the invention, a multi-stage filter is arranged between the mixing tank and the ultrafiltration system, and concentrated water of the multi-stage filter is conveyed to the cracking tank;
in one or more embodiments of the invention, the oxidation tank adopts ozone oxidation, the oxidation reaction time is 20-30 min, and the ozone in the ozone oxidation reaction tank is 200 mg/L;
compared with the prior art, the embodiment of the invention has the following advantages:
(1) The residual sludge generated in the hydrolysis acidification tank is mixed with the oily wastewater to be adjusted, and the pH is adjusted to 6-8, so that a preliminary demulsification effect can be realized, and the biodegradability of the wastewater is improved; the dried sludge is added into the mixing tank and uniformly mixed, so that oil drops in the wastewater can be adsorbed, meanwhile, the sludge sedimentation is promoted, and the load of an ultrafiltration system is greatly reduced;
(2) Concentrated water of an ultrafiltration system and/or a multistage filter is conveyed to a cracking tank, under the action of high temperature, sludge adsorbed with oil drops is cracked, and meanwhile, the collision of the oil drops in the water is promoted to form large oil drops at high temperature, so that the subsequent separation of the oil from the wastewater is facilitated, and the load of a subsequent treatment air floatation process is reduced;
(3) Carrying out air floatation treatment on the water discharged from the cracking tank, reducing the temperature of the mixed solution, further promoting the collision of oil drops to form large oil drops, and simultaneously floating solid particles with lighter density and the oil drops on the water surface so as to facilitate the slag skimming of a skimming machine;
(4) Insoluble substances contained in sediments generated by the air floatation tank can adsorb oil stains with high molecular weight, and the insoluble substances and the oil residues are burnt together after filter pressing treatment, so that the discharge of oil sludge is reduced while heat is generated and supplied to a high-temperature cracking process;
(5) The residual oil in the wastewater can be further recovered through air floatation, skimming and residue filtering machine treatment, and the recovery efficiency of the oil in the wastewater is improved;
(6) The slag is added into the mixing tank, and as the steel rolling oily wastewater contains scrap iron, the slag contains various oxides of iron, and the slag has porosity, and the slag can further adsorb oil in the wastewater and improve sedimentation effect when being added into the mixing tank.
Drawings
FIG. 1 is a schematic diagram of an oily wastewater treatment process according to one embodiment of the invention;
FIG. 2 is a schematic diagram of an oily wastewater treatment process including an air drying process according to one embodiment of the invention;
fig. 3 is a schematic diagram of an oily wastewater treatment process including a multi-stage filter according to one embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
Example 1
The COD (chemical oxygen demand) value of oily wastewater generated in the steel rolling process of a certain iron and steel enterprise is 26000mg/L, the ammonia nitrogen is 180mg/L, and the suspended matters are 560mg/L; as shown in fig. 1 to 3, an oily wastewater treatment process according to a preferred embodiment of the present invention comprises:
(1) And (3) adjusting: conveying the oily wastewater to an adjusting tank, adding acid sludge into the adjusting tank, wherein the acid sludge is surplus sludge generated in a hydrolytic acidification tank, adjusting the pH value (PH value) to 6-8, and adsorbing greasy dirt by part of the acid sludge, and meanwhile, demulsifying part of emulsified oil to form floating oil in the acid-base adjustment process;
(2) Mixing: delivering the wastewater in the regulating tank to a mixing tank for mixing, and adding dried sludge into the mixing tank, wherein the adding amount of the dried sludge is 30-60g/L, the dried sludge is mixed and adsorbed with floating oil generated in the regulating step in the mixing process to form blocky sludge which is easy to precipitate and remove, the COD (chemical oxygen demand) of effluent is 6960mg/L, and the suspended solids are 168mg/L, and the dried sludge added in the mixing tank is obtained by air-drying the residual sludge generated by the biochemical system;
(3) Ultrafiltration: conveying the supernatant in the mixing tank to an ultrafiltration system, wherein the ultrafiltration system adopts a plate-frame ultrafiltration system, the effluent of the ultrafiltration system is conveyed to a biochemical system, and the COD (chemical oxygen demand) of the effluent of the ultrafiltration system is 1200-2300mg/L; a multi-stage filter is arranged between the mixing tank and the ultrafiltration system, and concentrated water of the multi-stage filter is conveyed to the cracking tank;
(4) Cracking: delivering concentrated solution produced by the ultrafiltration system to a cracking tank for cracking, wherein the cracking tank is Wen Pojie tank high, high-temperature steam or high-temperature flue gas is added into the high-temperature cracking tank, waste gas generated in the high-temperature cracking tank is subjected to waste gas treatment, and the temperature of the high-temperature steam or the high-temperature flue gas delivered by the cracking tank is 150-300 ℃;
(5) Air floatation: conveying mixed liquid generated by the high-temperature cracking tank to an air floatation tank, wherein a skimming machine is arranged on the air floatation tank for skimming, scum collected by the skimming machine is conveyed to a residue filtering machine, waste liquid filtered by the residue filtering machine is conveyed to a regeneration tank for extraction and regeneration treatment, and effluent of the air floatation tank is conveyed to the biochemical system, wherein the retention time of the air floatation tank is 1.5h;
(6) Oxidizing: conveying sediment generated by the air floatation tank to a filter press for filter pressing treatment, conveying the water discharged by the filter press to an oxidation tank for oxidation treatment, wherein the oxidation tank adopts ozone oxidation, the oxidation reaction time is 20-30 min, and the ozone in the ozone oxidation reaction tank is 200 mg/L; delivering mud cakes generated by the filter press to an incinerator for incineration, delivering oil residues obtained by the filter residue machine to the incinerator for incineration, collecting bottom mud of the mixing tank, and delivering the bottom mud to the filter press for filter pressing treatment;
(7) Hydrolysis acidification: the method comprises the steps of conveying oxidation pond effluent to a hydrolysis acidification pond, conveying the hydrolysis acidification pond effluent to a biochemical system, staying for 2.5h in the hydrolysis acidification pond, controlling the concentration of dissolved oxygen in the hydrolysis acidification pond to be 0.3mg/L, controlling the concentration of sludge to be 12gVSS/L (VSS is a volatile suspension), rapidly intercepting and adsorbing granular substances, colloid substances, oils and the like in water in the hydrolysis acidification pond by a large amount of microorganisms in the hydrolysis acidification pond, converting the substances into small molecular substances through catabolism, rapidly realizing acidification of organic substances under the catalysis of facultative bacteria enzymes, converting organic substance molecules with complex structures into organic substances which are easy to biodegrade, further improving the treatment rate of subsequent biochemical treatment, and sequentially setting an AO (anoxic process) process and an MBR (membrane biological reaction process) process in the biochemical system, wherein the COD (chemical oxygen demand) of the MBR process effluent is 112mg/L, and the ammonia nitrogen is 8mg/L.
Example 2
On the basis of the specific embodiment 1, the slag generated by burning the incinerator is conveyed to the mixing pool, the adding amount of the slag is 100-200g/L, the COD of effluent is reduced to 5120mg/L, and the suspended matters are 173mg/L. The COD of the effluent of the MBR process is 72mg/L, and the ammonia nitrogen is 6mg/L.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (3)
1. An oily wastewater treatment process, which is characterized by comprising the following steps:
(1) And (3) adjusting: conveying the oily wastewater to a regulating tank, adding acid sludge into the regulating tank, wherein the acid sludge is surplus sludge generated in a hydrolysis acidification tank, and regulating the pH to 6-8;
(2) Mixing: delivering the wastewater in the regulating tank to a mixing tank for mixing, and adding dried sludge into the mixing tank, wherein the adding amount of the dried sludge is 30-60g/L;
(3) Ultrafiltration: conveying the supernatant in the mixing tank to an ultrafiltration system, wherein the ultrafiltration system adopts a plate-frame ultrafiltration system, and the effluent of the ultrafiltration system is conveyed to a biochemical system;
(4) Cracking: delivering concentrated solution produced by the ultrafiltration system to a cracking tank for cracking, wherein the cracking tank is Wen Pojie tank high, high-temperature steam or high-temperature flue gas is added into the high-temperature cracking tank, waste gas generated in the high-temperature cracking tank is subjected to waste gas treatment, and the temperature of the high-temperature steam or the high-temperature flue gas delivered by the cracking tank is 150-300 ℃;
(5) Air floatation: conveying mixed liquid generated by the high-temperature cracking tank to an air floatation tank, wherein a skimming machine is arranged on the air floatation tank for skimming, the scum collected by the skimming machine is conveyed to a residue filtering machine, waste liquid filtered by the residue filtering machine is conveyed to a regeneration tank for extraction and regeneration treatment, and effluent of the air floatation tank is conveyed to the biochemical system;
(6) Oxidizing: conveying sediment generated by an air floatation tank to a filter press for filter pressing treatment, conveying water discharged by the filter press to an oxidation tank for oxidation treatment, conveying mud cakes generated by the filter press to an incinerator for incineration, wherein the oxidation tank adopts ozone oxidation, the oxidation reaction time is 20-30 min, ozone in the ozone oxidation reaction tank is 200mg/L, conveying slag generated by incineration of the incinerator to the mixing tank, and the slag adding amount is 100-200g/L;
(7) Hydrolysis acidification: delivering the effluent of the oxidation pond to a hydrolysis acidification pond, and delivering the effluent of the hydrolysis acidification pond to the biochemical system;
a multi-stage filter is arranged between the mixing tank and the ultrafiltration system, concentrated water of the multi-stage filter is conveyed to the cracking tank, bottom mud of the mixing tank is collected, the bottom mud is conveyed to the cracking tank for cracking, and oil residue obtained by the residue filter is conveyed to the incinerator for incineration;
the oily wastewater is generated in a steel rolling process of an iron and steel enterprise; COD (chemical oxygen demand) value of the oily wastewater is 26000mg/L, ammonia nitrogen is 180mg/L, and suspended matters are 560mg/L.
2. The process for treating oily wastewater according to claim 1, wherein the dried sludge added to the mixing tank is obtained by air-drying excess sludge produced by the biochemical system.
3. An oily wastewater treatment process according to claim 1, wherein the biochemical system is provided with an AO process and an MBR process in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310504778.5A CN116217018B (en) | 2023-05-08 | 2023-05-08 | Oily wastewater treatment process |
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| CN115583764A (en) * | 2022-11-04 | 2023-01-10 | 上海宝冶工程技术有限公司 | Method for treating coal gasification wastewater |
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| CN103011515A (en) * | 2012-12-13 | 2013-04-03 | 杭州绿色环保技术开发有限公司 | Soybean wastewater biochemical treatment process and device |
| CN103408200A (en) * | 2013-08-27 | 2013-11-27 | 武汉钢铁(集团)公司 | Cold rolling oily wastewater treatment process |
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| CN115583764A (en) * | 2022-11-04 | 2023-01-10 | 上海宝冶工程技术有限公司 | Method for treating coal gasification wastewater |
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