CN111362366A - Port tank washing wastewater pretreatment method using iron-carbon micro-electrolysis method - Google Patents
Port tank washing wastewater pretreatment method using iron-carbon micro-electrolysis method Download PDFInfo
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- CN111362366A CN111362366A CN202010149036.1A CN202010149036A CN111362366A CN 111362366 A CN111362366 A CN 111362366A CN 202010149036 A CN202010149036 A CN 202010149036A CN 111362366 A CN111362366 A CN 111362366A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 64
- 238000005406 washing Methods 0.000 title claims abstract description 57
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 31
- 238000002203 pretreatment Methods 0.000 title claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000005273 aeration Methods 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 230000014759 maintenance of location Effects 0.000 claims abstract description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 6
- 239000012498 ultrapure water Substances 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000010979 pH adjustment Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a port washing tank wastewater pretreatment method by using an iron-carbon micro-electrolysis method, wherein the port washing tank wastewater with the pH value adjusted to 3-3.5 is sent into an iron-carbon micro-electrolysis reaction bed and is treated by an intermittent treatment method; wherein the adding amount of the scrap iron is 40-45 g/L, and the weight ratio of the adding amount of the activated carbon particles to the adding amount of the 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; the pretreatment method of the cabin washing wastewater is realized by adopting the existing iron-carbon micro-electrolysis reaction bed, and by optimizing treatment process parameters, the treatment method has the advantages of high treatment efficiency, low operation cost, small occupied area, convenience in operation and maintenance and the like, and simultaneously has stronger capability of improving the biodegradability of the wastewater, the concentration of refractory organic matters in the port cabin washing wastewater subjected to iron-carbon micro-electrolysis treatment is reduced, the purpose of greatly improving the biodegradability of the treated wastewater is realized, and the pretreatment requirement is met or the discharge standard is directly reached.
Description
Technical Field
The invention relates to the technical field of port chemical tank washing water treatment, in particular to a port tank washing wastewater pretreatment method by using an iron-carbon micro-electrolysis method.
Background
Among the numerous wastewater treatment technologies, iron-carbon micro-electrolysis is considered as an effective, inexpensive, economical reduction water treatment technology, and is generally used as a pretreatment technology for wastewater treatment. In recent years, attention has been paid to the treatment of organic wastewater which is difficult to degrade. In iron-carbon microelectrolysis, iron filings and activated carbon particles serve as electrode materials, spontaneously forming a large number of micro-current batteries, accompanied by a series of physical and chemical reactions. In addition, the cathode (activated carbon) that causes electrons accelerates the reduction reaction by transferring the electrons to pollutants or oxygen in the environment. In addition, an objective potential difference (1.2V) exists between the activated carbon and the scrap iron, so that the system can form a micro-electrolysis system more easily.
At present, the transportation mode of liquid chemicals in China mainly adopts bulk shipping, and port tank washing wastewater comes from ballast water and tank washing water generated in the loading and unloading operation process of cargo ships. The wastewater not only contains chemical substances which are difficult to biologically treat, such as toluene, phenol, formaldehyde, styrene, acrylonitrile and cleaning agents for cleaning cabins, but also has the characteristics of variability and randomness of the water quality and the water quantity of the wastewater due to intermittent operation of a special scattered port, various pollutants and the like, and has higher treatment difficulty. Pollutants in the water and residues after unloading and sweeping the cabin, if not effectively treated, have great influence on the water environment of the port.
COD of chemical cabin washing wastewaterCrGenerally more than 1500mg/L, and almost all are refractory organics, and the wastewater has the characteristics of high concentration of organics, poor biodegradability, high toxicity and the like, so that how to reduce the concentration of organics (especially refractory organics), remove or reduce the toxicity of the wastewater, change the water quality condition and the like before the wastewater is subjected to biochemical treatment is a key factor directly influencing the treatment effect and is also a difficult point in the pretreatment process of the wastewater at present.
Disclosure of Invention
The invention aims to provide a harbor tank washing wastewater pretreatment method using an iron-carbon micro-electrolysis method, which can be used for pretreating refractory organic matters, wastewater toxicity and water quality in chemical tank washing wastewater to improve the wastewater treatment effect.
Therefore, the technical scheme of the invention is as follows:
a method for pretreating port washing tank wastewater by using an iron-carbon micro-electrolysis method comprises the following steps:
feeding the port washing tank wastewater with the pH value adjusted to 3-3.5 into an iron-carbon micro-electrolysis reaction bed, and treating the wastewater by adopting an intermittent treatment method; wherein the adding amount of the scrap iron is 40-45 g/L, and the weight ratio of the adding amount of the activated carbon particles to the adding amount of the 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.
Preferably, in step S1, the particle size of the iron pieces is 2 to 6 mm.
Preferably, before the step S1 is performed, the iron pieces are soaked in ethanol for 5min, washed with ultrapure water for at least 3 times, then washed again with 0.1mol/L sulfuric acid for at least 3 times, washed with ultrapure water for at least 3 times, and finally dried in a vacuum drying oven at 105 ℃ for 8 hours.
Preferably, the particle size of the activated carbon particles is 1.5-3.0 mm.
Preferably, before the step S1, the activated carbon is soaked in the port washing wastewater for 60-72 hours, so that the activated carbon reaches an adsorption saturation state.
Compared with the prior art, the harbour washing tank wastewater pretreatment method utilizing the iron-carbon micro-electrolysis method is realized by adopting the existing iron-carbon micro-electrolysis reaction bed, and by optimizing the treatment process parameters, the treatment method has the advantages of high treatment efficiency, low operation cost, small occupied area, convenience in operation and maintenance and the like, and simultaneously has stronger capability of improving the biodegradability of wastewater, the concentration of refractory organic matters of the harbour washing tank wastewater subjected to the iron-carbon micro-electrolysis treatment is reduced, the purpose of greatly improving the biodegradability of the treated wastewater is realized, and the pretreatment requirement is met or the emission standard is directly reached.
Drawings
Fig. 1 is a schematic structural view of an iron-carbon micro-electrolysis reaction bed adopted in embodiments 1 to 3 of the present invention.
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. In the following embodiments, the iron filings with the particle size of 2-6 mm are used, and the iron filings are pretreated by the following method before use: soaking the iron filings in ethanol for 5min, cleaning with ultrapure water for 3-5 times, then rinsing again with 0.1mol/L sulfuric acid for 3-5 times, cleaning with ultrapure water for 3-5 times, and finally drying in a vacuum drying oven at 105 ℃ for 8 h; the activated carbon particles are 1.5-3.0 mm in particle size and are soaked in port washing wastewater to be treated for 72 hours for pretreatment before use.
Example 1
The pretreatment method of the port cabin washing wastewater is adopted to pretreat 4L of cabin washing water of a certain cabin washing station in Chongqing city, and the COD of the cabin washing water of the certain cabin washing station in Chongqing cityCr970-1150 mg/L, BOD5145-196 mg/L, BOD5/CODCr0.15 to 0.17, and a pH of 6.8 to 7.3; the specific treatment steps are as follows:
s1, building an iron-carbon micro-electrolysis reaction bed with reference to figure 1, wherein the iron-carbon micro-electrolysis reaction bed comprises a cylindrical tank body 4 with a water inlet at the bottom and a water outlet at the top, and the inner cavity of the tank body is divided into a micro-electricity reaction area at the upper part and an aeration mixing area at the lower part by a supporting layer 5 with micropores; wherein, the inner diameter of the cylindrical tank body is 0.1m, the effective height of the micro-electricity reaction zone is 0.6m, and the single wastewater treatment volume reaches 4L; the micro-electricity reaction area of the tank body is filled with a mixture 6 of activated carbon particles and scrap iron; the bottom of the aeration mixing zone is provided with a gas pumping pipe, the other end of the gas pumping pipe is communicated with an aeration pump 1, and the gas pumping pipe is also provided with a gas flowmeter 2 and a gas check valve 3;
based on 4L of cabin washing water to be treated at a time, 160g of scrap iron is added according to the adding amount of 40g/L, and 106.7g of activated carbon particles are added according to the weight ratio of the scrap iron to the activated carbon particles of 1.5: 1;
s2, adding 10 wt.% dilute sulfuric acid into a wastewater tank for storing the port tank washing wastewater, and adjusting the pH value of the tank washing wastewater to 3.1;
s3, pumping all the cabin washing wastewater subjected to pH adjustment into the iron-carbon micro-electrolysis reaction bed, controlling the flow rate of air introduced into the aeration mixing zone by the aeration pump to be 780mL/min & L, and keeping the residence time of the cabin washing wastewater in the iron-carbon micro-electrolysis reaction bed to be 180 min.
After the above steps S1-S3, the COD of the final effluent waterCr417-437 mg/L, BOD5146-166 mg/L, BOD5/CODCr0.35-0.38 percent, and the COD removal rate is 57-62 percent; the effluent quality meets the A-level standard requirement in the Water quality Standard for Sewage discharge into urban sewer (GB/T31962-2015), namely CODCrThe concentration is less than 500mg/L, BOD5The concentration is lower than 350mg/L, and the discharge can be directly carried out.
Example 2
The pretreatment method of the port washing wastewater is adopted to pretreat 4L of laboratory simulation washing water, and the preparation method of the laboratory simulation washing water comprises the steps of adding 0.22g of dimethylbenzene, 2.16g of methanol and 2.26g of ethyl acetate into clear water; the laboratory simulates COD of the cabin washing waterCr1800mg/l, pH 7.5; the specific treatment steps are as follows:
s1, building an iron-carbon micro-electrolysis reaction bed which is the same as that of the embodiment 1; based on 4L of cabin washing water to be treated at a time, adding 168g of scrap iron according to the adding amount of 42g/L, and adding 168g of activated carbon particles according to the weight ratio of the scrap iron to the activated carbon particles of 1: 1;
s2, adding 10 wt.% dilute sulfuric acid into a wastewater tank for storing the port tank washing wastewater, and adjusting the pH of the tank washing wastewater to 3.5;
s3, pumping all the cabin washing wastewater subjected to pH adjustment into the iron-carbon micro-electrolysis reaction bed, controlling the flow rate of air introduced into the aeration mixing zone by the aeration pump to be 750mL/min & L, and keeping the retention time of the cabin washing wastewater in the iron-carbon micro-electrolysis reaction bed to be 160 min.
After the above steps S1-S3, the COD of the final effluent waterCr485.8mg/L, CODCrThe removal rate is 73.0 percent, and the requirement of A-level standard in the Water quality Standard for discharging sewage into urban sewers (GB/T31962-2015) is met.
Example 3
The pretreatment method for the port washing wastewater has the advantages that the 4L Ningbo washing wastewater mainly contains aromatic hydrocarbons(xylene, mixed aromatics, heavy aromatics, etc.), ethers (methyl t-butyl ether, etc.), alcohols (methanol, ethylene glycol, etc.), specifically, COD of the tank-washing waterCr7400-8000 mg/L, BOD51332-1680 mg/L, BOD5/CODCr0.18 to 0.21, and a pH of 6.5 to 7.5; the specific treatment steps are as follows:
s1, building an iron-carbon micro-electrolysis reaction bed which is the same as that of the embodiment 1; based on 4L of cabin washing water to be treated at a time, adding 180g of scrap iron according to the adding amount of 45g/L, and adding 90g of activated carbon particles according to the weight ratio of the scrap iron to the activated carbon particles of 2: 1;
s2, adding 10 wt.% dilute sulfuric acid into a wastewater tank for storing the port tank washing wastewater, and adjusting the pH of the tank washing wastewater to 3.0;
s3, pumping all the cabin washing wastewater subjected to pH adjustment into the iron-carbon micro-electrolysis reaction bed, controlling the flow rate of air introduced into the aeration mixing zone by the aeration pump to be 800mL/min & L, and keeping the residence time of the cabin washing wastewater in the iron-carbon micro-electrolysis reaction bed to be 180 min.
After the above steps S1-S3, the COD of the final effluent waterCr4588 to 4320mg/L, BOD51285 to 1340mg/L, BOD5/CODCr0.28 to 0.31, CODCrThe removal rate is 38% -46%; therefore, the method for treating the cabin washing wastewater can effectively reduce the COD of the cabin washing wastewaterCrAnd refractory organic matters, so as to meet the pretreatment requirement of the cabin washing wastewater and improve the biodegradability of the cabin washing wastewater.
Claims (5)
1. A port washing tank wastewater pretreatment method by using an iron-carbon micro-electrolysis method is characterized by comprising the following steps: feeding the port washing tank wastewater with the pH value adjusted to 3-3.5 into an iron-carbon micro-electrolysis reaction bed, and treating the wastewater by adopting an intermittent treatment method; wherein the adding amount of the scrap iron is 40-45 g/L, and the weight ratio of the adding amount of the activated carbon particles to the adding amount of the 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.
2. The method for pretreating port washing wastewater by using an iron-carbon microelectrolysis method according to claim 1, wherein in step S1, the particle size of scrap iron is 2 to 6 mm.
3. The method for pretreating port washing wastewater by using iron-carbon microelectrolysis according to claim 2, wherein before performing step S1, scrap iron is soaked in ethanol for 5min and then washed with ultrapure water for at least 3 times, then washed again with 0.1mol/L sulfuric acid for at least 3 times and then washed with ultrapure water for at least 3 times, and finally dried in a vacuum drying oven at 105 ℃ for 8 hours.
4. The method for pretreating port washing wastewater by using an iron-carbon microelectrolysis method according to claim 1, wherein the particle size of activated carbon particles is 1.5-3.0 mm.
5. The method for pretreating port washing wastewater by using an iron-carbon microelectrolysis method according to claim 4, wherein activated carbon is soaked in the port washing wastewater for 60-72 hours before the step S1 is performed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277657A (en) * | 2021-06-03 | 2021-08-20 | 天津科技大学 | Treatment method of chemical cabin washing water and using device thereof |
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| JP2005058976A (en) * | 2003-08-20 | 2005-03-10 | Hitachi Maxell Ltd | Reduction system of excess sludge by electrolytic treatment |
| CN103663806A (en) * | 2013-12-13 | 2014-03-26 | 西安鹏博金属科技有限公司 | Method for cooperatively treating phenolic wastewater |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005058976A (en) * | 2003-08-20 | 2005-03-10 | Hitachi Maxell Ltd | Reduction system of excess sludge by electrolytic treatment |
| CN103663806A (en) * | 2013-12-13 | 2014-03-26 | 西安鹏博金属科技有限公司 | Method for cooperatively treating phenolic wastewater |
Non-Patent Citations (2)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277657A (en) * | 2021-06-03 | 2021-08-20 | 天津科技大学 | Treatment method of chemical cabin washing water and using device thereof |
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Application publication date: 20200703 |