CN113754206A - Operation method for controlling high COD concentration of discharged wastewater - Google Patents
Operation method for controlling high COD concentration of discharged wastewater Download PDFInfo
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- CN113754206A CN113754206A CN202111225779.3A CN202111225779A CN113754206A CN 113754206 A CN113754206 A CN 113754206A CN 202111225779 A CN202111225779 A CN 202111225779A CN 113754206 A CN113754206 A CN 113754206A
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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
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/583—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing fluoride or fluorine 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses an operation method for controlling high COD concentration of discharged wastewater, wherein a sulfur-containing wastewater treatment process comprises the steps of cooling sulfur-containing wastewater from a sulfur recovery unit through a heat exchanger, conveying the cooled sulfur-containing wastewater to a cyanogen breaking reaction tank, then conveying a defluorination reaction tank and a mean value adjusting tank in sequence, and finally discharging the sulfur-containing wastewater to an integrated A/O tank through a biochemical lift pump for treatment and conveying the sulfur-containing wastewater to a wastewater treatment plant; before the sulfur-containing wastewater is conveyed to a wastewater treatment plant, Chemical Oxygen Demand (COD) index of the sulfur-containing wastewater needs to be tested, a plurality of testing methods are carried out in the test, and the sulfur-containing wastewater is discharged after the COD index reaches the standard. According to the operation method for controlling the high COD concentration of the discharged wastewater, after the wastewater is treated by adding the sodium hypochlorite, the COD content in the wastewater can be controlled to be below 500mg/l, so that the discharge requirement is met, and the risk pressure of environment-friendly emission reaching the standard is relieved.
Description
Technical Field
The invention relates to the technical field of coal chemical wastewater treatment, in particular to an operation method for controlling high COD concentration of discharged wastewater.
Background
At present, the COD concentration discharged by wastewater from a wastewater treatment unit to a wastewater treatment plant has no effective control means, and when the COD concentration is continuously higher to about 1000mg/L, the receiving requirement of the wastewater treatment plant cannot be met, so that great risk and hidden danger exist. In order to reduce the COD concentration when the COD content in the wastewater is higher, avoid the limited sewage discharge and play an emergency role. Therefore, the economic and effective control of the pollution of high-concentration COD wastewater is also an important subject of the current environmental protection work and research. Since the COD concentration of the sulfur-containing wastewater in the wastewater from the wastewater treatment unit is high, the reduction of the COD concentration of the sulfur-containing wastewater is important for improving the water quality.
Disclosure of Invention
In view of the above-mentioned drawbacks or deficiencies in the prior art, it would be desirable to provide an operating method for controlling the COD concentration of discharged wastewater to be high.
The invention provides an operation method for controlling high COD concentration of discharged wastewater, wherein a sulfur-containing wastewater treatment process comprises the steps of cooling sulfur-containing wastewater from a sulfur recovery unit to below 40 ℃ through a heat exchanger, conveying the cooled sulfur-containing wastewater to a cyanogen breaking reaction tank, then conveying a defluorination reaction tank and a mean value adjusting tank in sequence, and finally discharging the wastewater to an integrated A/O tank through a biochemical lift pump for treatment and conveying the wastewater to a wastewater treatment plant; before the sulfur-containing wastewater is conveyed to a wastewater treatment plant, the COD index of the sulfur-containing wastewater needs to be tested.
Preferably, the assay detection comprises the steps of:
1) sampling and detecting the sulfur-containing wastewater, and sampling and detecting COD (chemical oxygen demand) and PH value indexes at sampling points of an outlet pipeline of the sulfur-containing wastewater, an outlet pipeline of a biochemical lifting pump, an outlet of a raw water lifting pump and an outlet of a standard water discharge pump of the cyanogen-breaking reaction tank respectively;
2) when the COD index of the detected sulfur-containing wastewater is more than 800mg/L, adding a sodium hypochlorite solution into the cyanogen breaking reaction tank through a sodium hypochlorite dosing pump, regulating the dosing amount to 250L/h, and simultaneously starting an underwater stirrer above the cyanogen breaking reaction tank to stir uniformly;
3) when the detected COD index of the sulfur-containing wastewater is less than 700mg/L, setting the dosage of the sodium hypochlorite dosing pump to be 125L/h;
4) when the detected COD index of the sulfur-containing wastewater is less than 600mg/L, closing the sodium hypochlorite dosing pump and stopping adding the sodium hypochlorite;
5) and (4) conveying the sulfur-containing wastewater with the detected COD index reaching the standard to a wastewater treatment plant.
Preferably, the sampling time is that the sodium hypochlorite dosing pump performs sampling after running for 30 min.
Compared with the prior art, the invention has the beneficial effects that:
after the operation method is implemented and sodium hypochlorite is added for treatment, the COD content in the wastewater can be controlled to be below 500mg/l, so that the emission requirement is met, and the risk pressure of environment-friendly emission reaching the standard is relieved.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of any embodiment of the invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a process flow chart of an operation method for controlling high COD concentration of discharged wastewater according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, an embodiment of the present invention provides an operation method for controlling high COD concentration of discharged wastewater, in which a sulfur-containing wastewater treatment process includes cooling sulfur-containing wastewater from a sulfur recovery unit to a temperature below 40 ℃ by a heat exchanger, conveying the cooled sulfur-containing wastewater to a cyanogen-breaking reaction tank, then successively conveying a defluorination reaction tank and a mean value adjusting tank, and finally discharging the sulfur-containing wastewater to an integrated a/O tank by a biochemical lift pump for treatment and conveying the sulfur-containing wastewater to a wastewater treatment plant; before the sulfur-containing wastewater is conveyed to a wastewater treatment plant, the COD index of the wastewater needs to be tested and detected.
In a preferred embodiment, the assay detection comprises the steps of:
1) sampling and detecting the sulfur-containing wastewater, and sampling and detecting COD (chemical oxygen demand) and PH value indexes at sampling points of an outlet pipeline of the sulfur-containing wastewater, an outlet pipeline of a biochemical lifting pump, an outlet pipeline of a raw water lifting pump and an outlet of a standard water discharge pump of a cyanogen-breaking reaction tank respectively;
2) when the COD index of the detected sulfur-containing wastewater is more than 800mg/L, adding a sodium hypochlorite solution into the cyanogen breaking reaction tank through a sodium hypochlorite dosing pump, regulating the dosing amount to 250L/h, and simultaneously starting an underwater stirrer above the cyanogen breaking reaction tank to stir uniformly;
3) when the COD index of the detected sulfur-containing wastewater is less than 700mg/L, setting the dosage of a sodium hypochlorite dosing pump to be 125L/h;
4) when the detected COD index of the sulfur-containing wastewater is less than 600mg/L, closing the sodium hypochlorite dosing pump and stopping adding the sodium hypochlorite;
5) and (4) conveying the sulfur-containing wastewater with the detected COD index reaching the standard to a wastewater treatment plant.
In a preferred embodiment, the sampling time is 30min after the sodium hypochlorite dosing pump runs.
During the operation, the liquid level of the cyanogen breaking reaction tank is adjusted, so that overflow and too low liquid level are prevented, and continuous operation is ensured as much as possible.
The COD index test result lags the current drainage index by more than 6 hours, and the actual working condition can not be reflected when the water quality fluctuates, so the specific equipment outage time is determined according to the experimental result. In the initial stage of device input, no matter the index is low, the sodium hypochlorite dosing pump is kept running for one week continuously, and test data are collected.
In the description of the present specification, the terms "connect", "mount", "fix", and the like are to be understood in a broad sense, for example, "connect" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, the description of the terms "one embodiment," "some embodiments," etc. means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (3)
1. An operation method for controlling high COD concentration of discharged wastewater is characterized in that a sulfur-containing wastewater treatment process comprises the steps of cooling sulfur-containing wastewater from a sulfur recovery unit to be below 40 ℃ through a heat exchanger, conveying the cooled sulfur-containing wastewater to a cyanogen breaking reaction tank, then conveying the cooled sulfur-containing wastewater to a defluorination reaction tank and a mean value adjusting tank in sequence, and finally discharging the sulfur-containing wastewater to an integrated A/O tank through a biochemical lift pump to be treated and conveying the sulfur-containing wastewater to a wastewater treatment plant; before the sulfur-containing wastewater is conveyed to a wastewater treatment plant, the COD index of the sulfur-containing wastewater needs to be tested.
2. The operating method for controlling high COD concentration of discharged wastewater according to claim 1, wherein said assay detection comprises the steps of:
1) sampling and detecting the sulfur-containing wastewater, and sampling and detecting COD (chemical oxygen demand) and PH value indexes at sampling points of an outlet pipeline of the sulfur-containing wastewater, an outlet pipeline of a biochemical lifting pump, an outlet of a raw water lifting pump and an outlet of a standard water discharge pump of the cyanogen-breaking reaction tank respectively;
2) when the COD index of the detected sulfur-containing wastewater is more than 800mg/L, adding a sodium hypochlorite solution into the cyanogen breaking reaction tank through a sodium hypochlorite dosing pump, regulating the dosing amount to 250L/h, and simultaneously starting an underwater stirrer above the cyanogen breaking reaction tank to stir uniformly;
3) when the detected COD index of the sulfur-containing wastewater is less than 700mg/L, setting the dosage of the sodium hypochlorite dosing pump to be 125L/h;
4) when the detected COD index of the sulfur-containing wastewater is less than 600mg/L, closing the sodium hypochlorite dosing pump and stopping adding the sodium hypochlorite;
5) and (4) conveying the sulfur-containing wastewater with the detected COD index reaching the standard to a wastewater treatment plant.
3. The operating method for controlling high COD concentration in discharged wastewater according to claim 2, wherein the sampling time is 30min after the sodium hypochlorite dosing pump is operated for sampling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111225779.3A CN113754206A (en) | 2021-10-21 | 2021-10-21 | Operation method for controlling high COD concentration of discharged wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111225779.3A CN113754206A (en) | 2021-10-21 | 2021-10-21 | Operation method for controlling high COD concentration of discharged wastewater |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018083173A (en) * | 2016-11-25 | 2018-05-31 | 三菱日立パワーシステムズ環境ソリューション株式会社 | Wastewater treatment method, wastewater treatment system and coal gasification power generation equipment with the same |
| CN207904106U (en) * | 2018-06-13 | 2018-09-25 | 高频美特利环境科技（北京）有限公司 | A kind of cyanide-containing waste water treatment system |
| CN211595265U (en) * | 2019-11-22 | 2020-09-29 | 兴源环境科技股份有限公司 | Advanced treatment system for cyanogen-fluorine combined pollution wastewater |
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- 2021-10-21 CN CN202111225779.3A patent/CN113754206A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018083173A (en) * | 2016-11-25 | 2018-05-31 | 三菱日立パワーシステムズ環境ソリューション株式会社 | Wastewater treatment method, wastewater treatment system and coal gasification power generation equipment with the same |
| CN207904106U (en) * | 2018-06-13 | 2018-09-25 | 高频美特利环境科技（北京）有限公司 | A kind of cyanide-containing waste water treatment system |
| CN211595265U (en) * | 2019-11-22 | 2020-09-29 | 兴源环境科技股份有限公司 | Advanced treatment system for cyanogen-fluorine combined pollution wastewater |
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Application publication date: 20211207 |