CN112979015B - Quality-divided treatment system and treatment method for port oily water - Google Patents
Quality-divided treatment system and treatment method for port oily water Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000010865 sewage Substances 0.000 claims abstract description 66
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 238000005191 phase separation Methods 0.000 claims abstract description 25
- 238000005345 coagulation Methods 0.000 claims abstract description 24
- 230000015271 coagulation Effects 0.000 claims abstract description 24
- 239000002351 wastewater Substances 0.000 claims abstract description 24
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000010802 sludge Substances 0.000 claims abstract description 16
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 93
- 239000002245 particle Substances 0.000 claims description 21
- 238000005188 flotation Methods 0.000 claims description 20
- 238000005086 pumping Methods 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 241000758789 Juglans Species 0.000 claims description 13
- 235000009496 Juglans regia Nutrition 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 13
- 235000020234 walnut Nutrition 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000006004 Quartz sand Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 10
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- 239000011148 porous material Substances 0.000 claims description 2
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- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
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- 238000005520 cutting process Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- 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
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- 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
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a port area oily water quality-based treatment system and a port area oily water quality-based treatment method, wherein the system comprises a first oily water treatment system, a second oily water treatment system, an oily water tank, a sludge tank and a biochemical treatment system; the first oily water treatment system comprises an adjusting tank, a three-phase separation adjuster and an axial-flow type cyclone oil-water separator; the second oily water treatment system comprises an inclined plate oil separation tank, a coagulation air floatation tank and a two-stage filtering device; the biochemical treatment system comprises an iron-carbon micro-electrolysis reaction device, a domestic sewage treatment system and a sewage deep treatment system; when in treatment, the first oily water treatment system, the second oily water treatment system and the biochemical treatment system are respectively used for treating oily water with low oil content, oily water with high oil content, port domestic sewage and wastewater which does not reach the standard and is treated by the systems; the system and the method can classify and treat the oil sewage with low oil content and the oil sewage with high oil content according to the characteristics of different types of oil sewage, thereby meeting the discharge requirement.
Description
Technical Field
The invention relates to the technical field of environment-friendly sewage treatment, in particular to a system and a method for treating port oily sewage according to qualities.
Background
At present, China vigorously carries out strengthening of energy conservation and emission reduction and pollution prevention, strict execution of national and local pollutant control standards and requirements of ship discharge areas, propulsion of measures in aspects of ship and port pollution prevention and the like so as to achieve strengthening of harbour area oily water treatment. According to the relevant national standards and regulations, a port oil sewage treatment station should be capable of treating oil sewage to not more than 10mg/L and even to meet the higher required discharge standards.
At the present stage, port oily water is uniformly collected to a port area oily water treatment system for uniform treatment; the port oily water treatment system comprises an adjusting tank, a advection oil separation tank (or an inclined plate oil separation tank, an inclined tube oil separation tank and a three-phase cyclone device), an oil-water separator, an air floatation device, a filter, a sludge dewatering unit, a waste oil storage unit and the like. However, the port oil sewage treatment method has the following problems: 1) the technological process of three-phase separation-air flotation-filtration can not meet the increasingly strict requirements of local discharge standards, especially for COD and BOD 5 The removal effect is poor; 2) the pollutant components in the oily sewage in the harbor area are very complex, the COD value of the main pollutant oil is changed greatly, the content is unstable, the water quality fluctuates frequently, the change range is large, and the traditional treatment process flow is difficult to meet the requirements of water quality and water quantity change; 3) the pollutant components in port oil polluted water are very complex, the oil component content is very high, the existing state is complex, and the oil components (floating oil, dispersed oil, emulsified oil, dissolved oil and the like) in the polluted water need to be treated in a targeted manner according to different characteristics of the oil components in the polluted water according to the existing mode of the oil in the polluted water.
Disclosure of Invention
The invention aims to provide a port area oily water quality-divided treatment system for solving the technical problems.
The invention also aims to provide a port area oily water quality-based treatment method realized by adopting the port area oily water quality-based treatment system
Therefore, the technical scheme of the invention is as follows:
a port area oily water quality-based treatment system comprises a first oily water treatment system, a second oily water treatment system, a dirty oil pool, a sludge pool and a biochemical treatment system; the first oily water treatment system comprises an adjusting tank, a three-phase separation adjuster and an axial-flow type rotational flow oil-water separator; the second oily water treatment system comprises an inclined plate oil separation tank, a coagulation air floatation tank and a two-stage filtering device; the biochemical treatment system comprises an iron-carbon micro-electrolysis reaction device, a domestic sewage treatment system and a sewage deep treatment system; wherein,
the first oily water treatment system is used for treating oily water with low oil content, and comprises ship ballast water in a harbor area, initial rainwater in an oil tank area, flushing water in a loading and unloading area of an oil depot area, fire-fighting wastewater in emergency drilling and accident states and the like; specifically, a liquid inlet of the three-phase separation regulator is connected with a liquid outlet of the regulating reservoir through a pipeline, and the liquid outlet is connected with a liquid inlet of the oil-water separator through a pipeline; a three-way valve is arranged at a liquid discharge port of the axial-flow type rotational flow oil-water separator, and two outlet ends of the three-way valve are respectively connected with a first liquid discharge pipe and a second liquid discharge pipe;
the second oily water treatment system is used for treating oily water with high oil content and high emulsified oil content, and comprises ship tank washing water, ship bilge oily water, oil tank cleaning water, oil tank cutting water in an oil reservoir area and hazardous waste room sewage in a harbor area; specifically, a first liquid inlet of the coagulation air flotation tank is connected with a liquid outlet of the inclined plate oil separation tank through a pipeline, a second liquid inlet of the coagulation air flotation tank is connected with a second liquid outlet pipe of the oil-water separator, and the liquid outlet of the coagulation air flotation tank is connected with a liquid inlet of the two-stage filtering device through a pipeline; a three-way valve is arranged at a liquid outlet of the two-stage filtering device, and two outlet ends of the three-way valve are respectively connected with a third liquid outlet pipe and a fourth liquid outlet pipe;
a liquid inlet of the iron-carbon micro-electrolysis reaction device is connected with a fourth liquid discharge pipe, and a liquid discharge port is connected with a liquid inlet of the domestic sewage treatment system through a pipeline; a liquid outlet of the domestic sewage treatment system is connected with a liquid inlet of the sewage advanced treatment system through a pipeline;
the sump oil discharge port of the three-phase separation regulator, the sump oil discharge port of the axial-flow type rotational flow oil-water separator and the sump oil discharge port of the inclined plate oil separation tank are respectively connected to the sump oil tank through pipelines; the sludge discharge port of the three-phase separation regulator, the sludge discharge port of the inclined plate oil separation tank and the scum discharge port of the coagulation air flotation tank are respectively connected into the sludge tank through pipelines;
and each pipeline and each liquid discharge pipe are provided with a regulating valve and a flow pump.
Furthermore, the length-diameter ratio of the axial-flow type rotational flow oil-water separator is 9.0, and a water outlet of the axial-flow type rotational flow oil-water separator is tangentially arranged.
Further, the three-phase separation regulator has the structural parameters as follows: the diameter of the liquid inlet is 0.25-0.30 times of that of the cyclone cavity, the diameter of the dirty oil discharge port is 0.020-0.022 times of that of the cyclone cavity, the diameter of the liquid discharge port is 0.15 times of that of the cyclone cavity, and the height-diameter ratio of the column section of the cyclone cavity is 2.8-3.0: 1.
Further, the double-stage filtering device is formed by connecting a quartz sand filter and a walnut shell filter in series, or is formed by connecting the walnut shell filter and a PE membrane filter in series.
Furthermore, the particle size of the quartz sand in the quartz sand filter is 2.0 mm; the particle size of the walnut shells in the walnut shell filter is 0.9-1.2 mm; the pore size of the PE membrane in the PE membrane filter was 0.50. mu.m.
Furthermore, an oil content detector is respectively arranged at the adjacent sides of the first liquid discharge pipe and the third liquid discharge pipe.
A quality-divided treatment method of oily water realized by adopting the quality-divided treatment system of oily water in a harbor district comprises the following steps:
step one, carrying out classification treatment on oily sewage in a harbor area:
dividing oily water in a harbor area by oil content, collecting and discharging oily water with low oil content into a regulating reservoir, collecting and discharging oily water with high oil content into an inclined plate oil separation tank, and discharging domestic sewage in the harbor area into a domestic sewage treatment system;
step two, treating the oily water with low oil content:
stirring and mixing the oily water with low oil content discharged into the tank body for 6-8 hours by using a stirring device of the regulating tank, and then pumping the oily water into a three-phase separation regulator to remove most of floating oil, silt and suspended matters in the oily water; then pumping the sewage into an axial-flow type rotational flow oil-water separator to remove fine oil particles in the oil sewage so as to finish the treatment of the oil sewage;
wherein, the structural parameter of three-phase separation regulator is: the diameter of the liquid inlet is 0.25-0.30 times of the diameter of the swirl cavity, the diameter of the sump oil discharge port is 0.020-0.022 times of the diameter of the swirl cavity, and the diameter of the liquid discharge port is 0.15 times of the diameter of the swirl cavity; the height-diameter ratio of the column section of the vortex cavity is 2.8-3.0: 1; the length-diameter ratio of the axial-flow type rotational flow oil-water separator is 9.0, and a water outlet of the axial-flow type rotational flow oil-water separator is tangentially arranged;
if the treated oily water is detected by an oil content detector to reach the discharge standard, the treated oily water can be directly discharged; if the treated oily water is detected by an oil content detector to be not in the discharge standard, pumping the treated oily water into a coagulation air floatation tank;
step three, treating the oily water with high oil content:
while the second step is carried out, the retention time of the oily water with high oil content discharged to the inclined plate oil separation tank in the water inlet tank, the inclined plate oil separation tank and the water storage tank is controlled to be 0.5-1.0 h, 45-60 min and at least 3.0h respectively so as to remove floating oil and dispersed oil with the oil content of more than 10 mu m; pumping the effluent of the inclined plate oil separation tank into a coagulation air flotation device, adding a composite flocculant in a feeding amount of 45-100 mg/L, and removing emulsified oil by a cavitation micro-bubble air flotation method; then pumping the effluent of the coagulation air flotation device into a two-stage filter, and sequentially passing through a coarse filter and a fine filter of the two-stage filter device to finish the removal of small-particle suspended oil;
if the treated oily water is detected by an oil content detector to reach the discharge standard, the treated oily water can be directly discharged; if the treated oily water is detected by an oil content detector to be not in the discharge standard, pumping the treated oily water into an iron-carbon micro-electrolysis reaction device;
step four, adjusting the pH value of the wastewater to 3-3.5 and discharging the wastewater into an iron-carbon micro-electrolysis reaction device for electrolysis treatment while performing the step two and the step three; wherein the adding amount of scrap iron is 40-45 g/L, the particle size of activated carbon particles is 1.5-3.0 mm, the particle size of scrap iron is 2-6 mm, and the weight ratio of the adding amount of activated carbon particles to the adding amount of scrap iron is 1-2: 1; the flow rate of air introduced into the aeration mixing zone by the aeration pump is 750-800 mL/min.L, and the retention time of the wastewater in the iron-carbon micro-electrolysis reaction bed is 160-180 min; after the electrolysis treatment, the sewage is pumped to a domestic sewage treatment system to be sequentially treated with the domestic sewage in the harbor district and the advanced treatment of the sewage, and the requirement of reaching the standard discharge is achieved.
Further, the composite flocculant is a polymeric aluminum ferric chloride-chitosan type composite flocculant or a polymeric aluminum ferric sulfate-chitosan type composite flocculant.
The components, the connecting pipelines, the valves and the like in the port area oily water quality-divided treatment system adopt the existing products sold in the market or the conventional systems in the field.
Compared with the prior art, the harbor oily water quality-classifying treatment system and the harbor oily water quality-classifying treatment method can classify and treat harbor oily water such as ship ballast water, initial rainwater of an oil tank region, ship cabin washing water, ship bilge oily water, oil tank cleaning water, oil tank cutting water of the oil storage region, hazardous waste sewage and the like according to the characteristics of different types of oily water, and are communicated with a domestic sewage treatment system to form a complete water treatment system suitable for harbor region production and life.
Drawings
FIG. 1 is a schematic structural diagram of a port area oily water quality-based treatment system.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
Example 1
As shown in figure 1, the port area oily water quality-divided treatment system comprises a first oily water treatment system, a second oily water treatment system, a dirty oil pool, a sludge pool and a biochemical treatment system; the first oily water treatment system comprises an adjusting tank, a three-phase separation adjuster and an axial-flow type rotational flow oil-water separator; the second oily water treatment system comprises an inclined plate oil separation tank, a coagulation air floatation tank and a two-stage filtering device; the biochemical treatment system comprises an iron-carbon micro-electrolysis reaction device, a domestic sewage treatment system and a sewage deep treatment system; wherein,
in the first oily water treatment system, a liquid inlet of a three-phase separation regulator is connected with a liquid outlet of an adjusting pool through a pipeline, and the liquid outlet is connected with a liquid inlet of an oil-water separator through a pipeline; a three-way valve is arranged at a liquid discharge port of the axial-flow type rotational flow oil-water separator, and two outlet ends of the three-way valve are respectively connected with a first liquid discharge pipe and a second liquid discharge pipe; the length-diameter ratio of the axial-flow type rotational flow oil-water separator is 9.0, and a water outlet of the axial-flow type rotational flow oil-water separator is tangentially arranged; with the size phase-match of axial-flow type whirl oil water separator, the structural parameter of three-phase separation regulator is: the diameter of the liquid inlet is 0.25-0.30 times of that of the cyclone cavity, the diameter of the dirty oil discharge port is 0.020-0.022 times of that of the cyclone cavity, the diameter of the liquid discharge port is 0.15 times of that of the cyclone cavity, and the height-diameter ratio of the column section of the cyclone cavity is 2.8-3.0: 1;
particularly, a plurality of collecting containers of the oily water with low oil content in the harbor area are respectively connected and communicated with a liquid inlet of an adjusting tank through connecting pipelines, so that the oily water with low oil content in the harbor area is firstly discharged into the adjusting tank, and the preliminary adjustment of water quality and water quantity is realized; wherein, the water quality regulation specifically means that different types of oily water entering the regulating tank are fully mixed, the fluctuation of the water quality of the inlet water is reduced as much as possible, and the homogenization effect is achieved; the water quantity regulation specifically refers to that the oily water with low oil content entering the regulating reservoir at different flow rates flows into the three-phase separation regulator at a reasonable flow rate after the oily water is subjected to water quality regulation and stays for a period of time; the three-phase separation regulator separates most of floating oil, silt and suspended matters in the low-oil-content oil wastewater, and the oil-water separator effectively removes fine oil particles which cannot be removed by the three-phase separator, so that a better oil-water separation effect is achieved; if the sampled water obtained by the first drainage pipe is detected as standard wastewater by an oil content detector, the wastewater can be directly drained; if the sampled water obtained by the first liquid discharge pipe is unqualified after being detected by the oil content detector, discharging the wastewater treated by the oil-water separator into a coagulation air floatation tank of a second oily water treatment system through a second liquid discharge pipe;
in a second oily water treatment system, a first liquid inlet of a coagulation air flotation tank is connected with a liquid outlet of an inclined plate oil separation tank through a pipeline, a second liquid inlet is connected with a second liquid outlet pipe of an oil-water separator, and a liquid outlet is connected with a liquid inlet of a two-stage filtering device through a pipeline; a three-way valve is arranged at a liquid outlet of the two-stage filtering device, and two outlet ends of the three-way valve are respectively connected with a third liquid outlet pipe and a fourth liquid outlet pipe; wherein the double-stage filtering device is formed by connecting a quartz sand filter and a walnut shell filter in series; specifically, the particle size of the quartz sand in the quartz sand filter is 2.0 mm; the particle size of the walnut shells in the walnut shell filter is 0.9-1.2 mm;
particularly, a plurality of collecting containers of oily water with high oil content in a harbor area are respectively connected and communicated with a liquid inlet of an inclined plate oil separation tank through connecting pipelines, so that the oily water with high oil content in the harbor area is firstly discharged into the inclined plate oil separation tank to remove floating oil and dispersed oil with the diameter of more than 10 mu m in the oily water, and emulsified oil and small-particle suspended oil in the oily water are separated from wastewater after emulsion breaking treatment is carried out on the emulsified oil and the small-particle suspended oil by a coagulation air flotation tank; then the wastewater sequentially passes through an intensive two-stage filtering device which integrates rough filtering (a quartz sand filter) and fine filtering (a walnut shell filter) to finish the treatment of oily water with high oil content and high emulsified oil content; if the sampled water obtained by the third liquid discharge pipe is detected by the oil content detector to be standard wastewater, the wastewater can be directly discharged; if the sampled water obtained by the third liquid discharge pipe is unqualified after being detected by the oil content detector, discharging the wastewater treated by the oil-water separator into an iron-carbon micro-electrolysis reaction device of a biochemical treatment system through a fourth liquid discharge pipe;
in the biochemical treatment system, a liquid inlet of the iron-carbon micro-electrolysis reaction device is connected with a fourth liquid discharge pipe, and a liquid discharge port is connected with a liquid inlet of the domestic sewage treatment system through a pipeline; a liquid outlet of the domestic sewage treatment system is connected with a liquid inlet of the sewage advanced treatment system through a pipeline;
in the synchronous working process of the three systems, the dirty oil discharge port of the three-phase separation regulator, the dirty oil discharge port of the axial-flow type cyclone oil-water separator and the dirty oil discharge port of the inclined plate oil separation tank are respectively connected into the dirty oil tank through pipelines, so that the floating oil or the oil stain generated in the water treatment process of the three systems are uniformly discharged into the dirty oil tank for collection so as to be periodically pumped and transported; the sludge discharge port of the three-phase separation regulator, the sludge discharge port of the inclined plate oil separation tank and the scum discharge port of the coagulation air flotation tank are respectively connected into the sludge tank through pipelines, so that sludge or scum generated in the water treatment process of the three are uniformly discharged into the sludge tank for collection, and are sucked and transported outwards at regular intervals; (ii) a
The pipelines and the liquid discharge pipes are provided with regulating valves and flow pumps to control the effluent of each stage to enter the next device at a proper flow rate; and the adjacent sides of the first liquid discharge pipe and the third liquid discharge pipe are respectively provided with an oil detector to respectively detect whether the wastewater treated by the first oily water treatment system and the second oily water treatment system meets the standard of direct discharge.
Example 2
The main sources of oily sewage in a certain port area of Shandong are ship bilge water, ship cabin washing water, ship ballast water, maintenance wastewater, oil depot washing water, initial rainwater, oil tank cutting water, oil tank washing water and emergency fire-fighting oily sewage. Wherein, the oil content of the high oil content oily water is more than 10000mg, and the oil content of the low oil content oily water is 3000-10000 mg/L.
The harbor district is originally provided with an independent oil sewage treatment station which consists of an adjusting tank, a three-phase separation adjuster, an oil-water separator, an air flotation device, a filter and a clean water tank which are connected in sequence; when the device is used, oily sewage with high oil content (ship tank washing water, ship bilge oily sewage, oil tank cleaning water and oil tank cutting water in an oil storage area) and oily sewage with low oil content (ship ballast water, initial rainwater in the oil tank area, flushing water in the loading and unloading area of the oil storage area and emergency fire-fighting oily sewage) generated in a port area are collected and discharged into a regulating tank, and the oily sewage is mixed uniformly and then sequentially enters a subsequent treatment device to complete oily sewage treatment. In the prior treatment process, the water quality condition of the regulating tank is as follows: the content of petroleum is 3000-30000 mg/L, the oil density is 0.769-0.9 mg/L, the SS is 2500-4000 mg/L, the temperature is 5-20 ℃, and the pH is 6-9; the concentrations of various pollutants in the effluent after being treated by the system are as follows: oil content of 6.0-10.0 mg/L, SS of 25-55 mg/L, BOD 5 16-40 mg/L, and COD 30-130 mg/L. The technical personnel analyze and think that the inlet water quality and the water quantity of the port have larger changes, and the processing device has poorer adaptability to the changes of the water quality and the water quantity, thereby leading to the situation that the port has larger changes of the inlet water quality and the inlet water quantity, and the port has lower adaptability to the changes of the water quality and the inlet water quantityThe treated oily water can not stably reach the comprehensive discharge standard of water pollutants in peninsula watershed of Shandong province, and the key problems are COD and BOD 5 And the indexes exceed the standard and do not meet the specified processing requirement.
In order to solve the problem, the port area oily water quality-divided treatment system of the embodiment 1 is constructed in the port area and a pilot test is carried out, and the specific implementation process is as follows:
step one, carrying out classification treatment on oily sewage in a harbor area:
dividing oily water in a harbor area by oil content, collecting and discharging oily water with low oil content into a regulating reservoir, collecting and discharging oily water with high oil content into an inclined plate oil separation tank, and discharging domestic sewage in the harbor area into a domestic sewage treatment system;
step two, treating the oily water with low oil content:
stirring and mixing the oily water with low oil content discharged into the tank body for 6 hours by using a stirring device of the regulating tank, and then pumping the oily water into a three-phase separation regulator to remove most of floating oil, silt and suspended matters in the oily water; then pumping the wastewater into an axial-flow type rotational flow oil-water separator to remove fine oil particles in the oil wastewater, thereby finishing oil wastewater treatment;
wherein, the structural parameter of three-phase separation regulator is: the diameter of the liquid inlet is 0.30 times of that of the cyclone cavity, the diameter of the dirty oil discharge port is 0.022 times of that of the cyclone cavity, and the diameter of the liquid discharge port is 0.15 times of that of the cyclone cavity; the height-diameter ratio of the column section of the vortex cavity is 3.0: 1; the length-diameter ratio of the axial-flow type rotational flow oil-water separator is 9.0, and a water outlet of the axial-flow type rotational flow oil-water separator is tangentially arranged;
the oil content detector detects the sampling water obtained through the first drainage pipe, and the detection result is as follows: oil content of 3.0-5.5 mg/L, SS of 20.0-33.6 mg/L, BOD 5 15.4-28.5 mg/L and 31.0-85.6 mg/L of COD, meets the requirements of various water qualities of standard wastewater and can be directly discharged;
step three, treating the oily water with high oil content:
while the step two is carried out, the retention time of the oily water with high oil content discharged to the inclined plate oil separation tank in the water inlet tank, the inclined plate oil separation tank and the water storage tank is controlled to be 1.0h, 45min and 3.0h respectively so as to remove floating oil and dispersed oil with the diameter of more than 10 mu m; pumping the effluent of the inclined plate oil separation tank into a coagulation air flotation device, adding a composite flocculant (polymeric aluminum ferric chloride-chitosan type composite flocculant) in a feeding amount of 65mg/L, and removing emulsified oil by a cavitation micro-bubble air flotation method; then pumping the effluent of the coagulation air floatation device into a double-stage filter, and sequentially passing through a quartz sand filter and a walnut shell filter of the double-stage filter device to finish the removal of small particle suspended oil;
the oil content detector detects the sampled water obtained by the third liquid discharge pipe, and the detection result is as follows: the oil content is 2.0-4.5 mg/L, the SS is 12.5-17.5 mg/L, the BOD5 is 10.6-25.0 mg/L, the COD is 33.0-70.5 mg/L, and the wastewater meets the requirements of various water qualities of standard wastewater and can be directly discharged;
step four, when the step two and the step three are carried out, the port area domestic sewage is sequentially subjected to domestic sewage treatment and sewage advanced treatment, and the requirement of reaching the standard discharge is met.
In the above-described pilot test, the water quality and the water amount were changed with reference to the oily water actually generated in the harbor area.
After three months of stable operation, the oily water treatment technology adopted in the test shows certain superiority, and the effluent treated by the first oily water treatment system and the second oily water treatment system can stably reach the comprehensive discharge standard of water pollutants in peninsula watershed of Shandong province.
Claims (7)
1. A quality-divided treatment method of oily water based on a port area oily water quality-divided treatment system is characterized in that the port area oily water quality-divided treatment system comprises a first oily water treatment system, a second oily water treatment system, a dirty oil pool, a sludge pool and a biochemical treatment system; the first oily water treatment system comprises an adjusting tank, a three-phase separation adjuster and an axial-flow type rotational flow oil-water separator; the second oily water treatment system comprises an inclined plate oil separation tank, a coagulation air flotation tank and a two-stage filtering device; the biochemical treatment system comprises an iron-carbon micro-electrolysis reaction device, a domestic sewage treatment system and a sewage deep treatment system; wherein,
the liquid inlet of the three-phase separation regulator is connected with the liquid outlet of the regulating reservoir through a pipeline, and the liquid outlet is connected with the liquid inlet of the oil-water separator through a pipeline; a three-way valve is arranged at a liquid discharge port of the axial-flow type rotational flow oil-water separator, and two outlet ends of the three-way valve are respectively connected with a first liquid discharge pipe and a second liquid discharge pipe;
the first liquid inlet of the coagulation air flotation tank is connected with the liquid outlet of the inclined plate oil separation tank through a pipeline, the second liquid inlet of the coagulation air flotation tank is connected with the second liquid outlet pipe of the oil-water separator, and the liquid outlet of the coagulation air flotation tank is connected with the liquid inlet of the two-stage filtering device through a pipeline; a three-way valve is arranged at a liquid outlet of the two-stage filtering device, and two outlet ends of the three-way valve are respectively connected with a third liquid outlet pipe and a fourth liquid outlet pipe;
a liquid inlet of the iron-carbon micro-electrolysis reaction device is connected with a fourth liquid discharge pipe, and a liquid discharge port is connected with a liquid inlet of the domestic sewage treatment system through a pipeline; a liquid outlet of the domestic sewage treatment system is connected with a liquid inlet of the sewage advanced treatment system through a pipeline;
the sump oil discharge port of the three-phase separation regulator, the sump oil discharge port of the axial-flow type rotational flow oil-water separator and the sump oil discharge port of the inclined plate oil separation tank are respectively connected to the sump oil tank through pipelines; the sludge discharge port of the three-phase separation regulator, the sludge discharge port of the inclined plate oil separation tank and the scum discharge port of the coagulation air flotation tank are respectively connected into the sludge tank through pipelines;
each pipeline and each liquid discharge pipe are provided with a regulating valve and a flow pump;
the quality-divided treatment method of the oily water is characterized by comprising the following steps:
step one, carrying out classification treatment on oily sewage in a harbor area:
dividing oily water in a harbor area by oil content, collecting and discharging oily water with low oil content into a regulating reservoir, collecting and discharging oily water with high oil content into an inclined plate oil separation tank, and discharging domestic sewage in the harbor area into a domestic sewage treatment system;
step two, treating the oily water with low oil content:
stirring and mixing the oily water with low oil content discharged into the tank body for 6-8 hours by using a stirring device of the regulating tank, and then pumping the oily water into a three-phase separation regulator to remove most of floating oil, silt and suspended matters in the oily water; then pumping the sewage into an axial-flow type rotational flow oil-water separator to remove fine oil particles in the oil sewage so as to finish the treatment of the oil sewage;
wherein, the structural parameter of three-phase separation regulator is: the diameter of the liquid inlet is 0.25-0.30 times of the diameter of the rotational flow cavity, the diameter of the dirty oil discharge port is 0.020-0.022 times of the diameter of the rotational flow cavity, and the diameter of the liquid discharge port is 0.15 times of the diameter of the rotational flow cavity; the height-diameter ratio of the column section of the vortex cavity is 2.8-3.0: 1; the length-diameter ratio of the axial-flow type rotational flow oil-water separator is 9.0, and a water outlet of the axial-flow type rotational flow oil-water separator is tangentially arranged;
if the treated oily water is detected by an oil content detector to reach the discharge standard, the treated oily water can be directly discharged; if the treated oily water is detected by an oil content detector to be not in the discharge standard, pumping the treated oily water into a coagulation air floatation tank;
step three, treating the oily water with high oil content:
while the second step is carried out, the retention time of the oily water with high oil content discharged to the inclined plate oil separation tank in the water inlet tank, the inclined plate oil separation tank and the water storage tank is controlled to be 0.5-1.0 h, 45-60 min and at least 3.0h respectively so as to remove floating oil and dispersed oil with the oil content of more than 10 mu m; pumping the effluent of the inclined plate oil separation tank into a coagulation air flotation device, adding a composite flocculant in a feeding amount of 45-100 mg/L, and removing emulsified oil by a cavitation micro-bubble air flotation method; then pumping the effluent of the coagulation air floatation device into a double-stage filter, and sequentially passing through a coarse filter and a fine filter of the double-stage filter device to finish the removal of small-particle suspended oil;
if the treated oily water is detected by an oil content detector to reach the discharge standard, the treated oily water can be directly discharged; if the treated oily water is detected by an oil content detector to be not in the discharge standard, pumping the treated oily water into an iron-carbon micro-electrolysis reaction device;
step four, adjusting the pH value of the wastewater to 3-3.5 and discharging the wastewater into an iron-carbon micro-electrolysis reaction device for electrolysis treatment while performing the step two and the step three; wherein the adding amount of the iron filings is 40-45 g/L, the activated carbon particles are 1.5-3.0 mm, the iron filings are 2-6 mm, and the weight ratio of the adding amount of the activated carbon particles to the adding amount of the iron filings is 1-2: 1; the flow rate of air introduced into the aeration mixing zone by the aeration pump is 750-800 mL/min.L, and the retention time of the wastewater in the iron-carbon micro-electrolysis reaction bed is 160-180 min; after the electrolysis treatment, the sewage is pumped to a domestic sewage treatment system to be sequentially treated with the domestic sewage in the harbor district and the advanced treatment of the sewage, and the requirement of reaching the standard discharge is achieved.
2. The method for treating the oily water according to the quality division of the oily water, which is described in claim 1, wherein the length-diameter ratio of the axial flow type cyclone oil-water separator is 9.0, and a water outlet of the axial flow type cyclone oil-water separator is tangentially arranged.
3. The oily water quality-separating treatment method according to claim 1, wherein the three-phase separation regulator has the structural parameters: the diameter of the liquid inlet is 0.25-0.30 times of that of the swirl cavity, the diameter of the dirty oil discharge port is 0.020-0.022 times of that of the swirl cavity, the diameter of the liquid discharge port is 0.15 times of that of the swirl cavity, and the height-diameter ratio of the column section of the swirl cavity is 2.8-3.0: 1.
4. The method for treating oily water according to claim 1, wherein the double-stage filtering device is formed by connecting a quartz sand filter and a walnut shell filter in series or by connecting the walnut shell filter and a PE membrane filter in series.
5. The method for treating the oily water according to the quality division, wherein the particle size of the quartz sand in the quartz sand filter is 2.0 mm; the particle size of the walnut shells in the walnut shell filter is 0.9-1.2 mm; the pore size of the PE membrane in the PE membrane filter was 0.50. mu.m.
6. The method according to claim 1, wherein an oil content detector is disposed adjacent to each of the first drain pipe and the third drain pipe.
7. The method for treating the oil-contaminated water according to claim 1, wherein the composite flocculant is a polyaluminum ferric chloride-chitosan type composite flocculant or a polyaluminum ferric sulfate-chitosan type composite flocculant.
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