LU500327B1 - Wastewater treatment method - Google Patents
Wastewater treatment method Download PDFInfo
- Publication number
- LU500327B1 LU500327B1 LU500327A LU500327A LU500327B1 LU 500327 B1 LU500327 B1 LU 500327B1 LU 500327 A LU500327 A LU 500327A LU 500327 A LU500327 A LU 500327A LU 500327 B1 LU500327 B1 LU 500327B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- adsorbent
- alkaline
- alkaline adsorbent
- wastewater
- treatment method
- Prior art date
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
- C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
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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
- C02F2101/30—Organic 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
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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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
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic 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
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/152—Water filtration
Abstract
The present invention discloses a wastewater treatment method. The wastewater treatment method includes the following steps: mixing and stirring an alkaline adsorbent and wastewater containing acetic acid in proportion to transfer colored odorous organic pollutants in the wastewater into the alkaline adsorbent, enabling alkaline substances in the alkaline adsorbent to react with acetic acid to generate acetate dissolving in water, performing filtration to obtain an aqueous phase containing the acetate and a wet solid phase of the alkaline adsorbent containing the colored odorous organic pollutants, mixing the wet solid phase of the alkaline adsorbent and fuel, delivering the mixture into a boiler furnace to burn the pollutants therein to regenerate and recycle the alkaline adsorbent, and treating the aqueous phase obtained by filtration with the alkaline adsorbent until approaching neutrality. In the wastewater treatment method of the present invention, the adsorbent for wastewater treatment is slag ash which is low in cost, thereby achieving the purpose of treating waste with waste. The treated wastewater is rich in elements which are necessary for crop growth and can be easily absorbed and utilized by crops, such as potassium acetate and calcium acetate, and can be used as farmland irrigation water.
Description
BACKGROUND Technical Field The present invention relates to the field of wastewater treatment, and specifically relates to a wastewater treatment method. Related Art Wastewater containing multiple organic substances such as acetic acid is extensive in industry. General chemical treatment or biochemical treatment is high in cost and poor in treatment effect. For example, in the production of furfural, the water consumption is larger, and the wastewater at the tower bottom of a furfural preliminary distillation tower contains multiple organic substances such as acetic acid, so that the wastewater has a dark yellow color and is odorous. At present, furfural plants generally use wastewater evaporators to recycle the wastewater at the tower bottom, but this technology has high energy consumption. Furthermore, if the wastewater is not treated in time after repeated cycles, the waste will accumulate, which will adversely affect the production process and easily cause environmental pollution.
SUMMARY The present invention aims to provide a wastewater treatment method. An alkaline adsorbent and wastewater containing multiple organic substances such as acetic acid are mixed and stirred fully, then colored odorous organic pollutants in the wastewater are transferred into the adsorbent, and the acetic acid in the wastewater reacts with alkaline potassium salts (potassium carbonate, etc.) and alkaline oxides (calcium oxide, etc.) in the adsorbent to generate soluble acetates such as potassium acetate and calcium acetate dissolving in water. The alkaline adsorbent is slag ash, and the slag ash includes, but is not limited to, slag ash of a furfural slag burning boiler, slag ash of a biomass power plant and slag ash of a coal power plant. After full stirring, mixing and absorption, solid-liquid separation is performed. When the adsorbent is stacked for a period of time and the moisture content is reduced to about 15%, the adsorbent is mixed with fuel, the mixture is delivered into a boiler furnace and burnt, the adsorbed organic pollutants are burnt to generate carbon dioxide and water, the adsorbed moisture is vaporized, and thus the adsorbent can be regenerated and recycled after being discharged from the furnace. The liquid phase obtained by the solid-liquid separation is adsorbed with the adsorbent until the PH value of the liquid phase reaches 6 to 8. The treated wastewater is rich in water-soluble salts such as potassium acetate and calcium acetate,
and the potassium and calcium contained in the water-soluble salts are elements necessary for crop growth, so the treated water can be used for farmland irrigation.
The objective of the present invention can be achieved by the following technical solution: Provided 1s wastewater treatment method, including the following steps: S1: mixing and stirring: mixing and stirring an alkaline adsorbent and wastewater containing acetic acid in proportion to transfer colored odorous organic pollutants in the wastewater into the alkaline adsorbent, enabling alkaline substances in the alkaline adsorbent to react with acetic acid to generate acetate dissolving in water, performing filtration to obtain an aqueous phase containing the acetate and a wet solid phase of the alkaline adsorbent containing the colored odorous organic pollutants, mixing the wet solid phase of the alkaline adsorbent and fuel, delivering the mixture into a boiler furnace to burn the pollutants therein to regenerate and recycle the alkaline adsorbent, and treating the aqueous phase obtained by filtration with the alkaline adsorbent until approaching neutrality; S2: filtration: performing filtration to obtain an aqueous phase containing the acetate and a wet solid phase of the alkaline adsorbent containing the colored odorous organic pollutants, mixing the wet solid phase of the alkaline adsorbent and fuel, and delivering the mixture into the boiler furnace to burn the pollutants therein to regenerate and recycle the alkaline adsorbent; and S3: adsorbent treatment: treating the aqueous phase obtained by filtration with the alkaline adsorbent until reaching neutrality. Further, the alkaline adsorbent is slag ash, and the slag ash is: slag ash of a furfural slag burning boiler or slag ash of a biomass power plant or slag ash of a coal power plant. Further, a mass ratio of the wastewater containing acetic acid to the alkaline adsorbent is 5:(1-10). Further, time for the mixing and stirring is 5-30 min. Further, the wet solid phase of the adsorbent after filtration in S2 and the fuel are mixed and then delivered into the boiler furnace and burnt, the organic pollutants therein are burnt, the adsorbed moisture is vaporized, the adsorbent is regenerated and recycled, and the aqueous phase obtained after solid-liquid separation is adsorbed with the adsorbent until the PH of the aqueous phase is 6 to 8. The present invention has the following beneficial effects:
1. In the wastewater treatment method of the present invention, the adsorbent for wastewater treatment 1s slag ash which is low in cost, thereby achieving the purpose of treating waste with waste.
2. The wastewater treated by the treatment method of the present invention is rich in elements which are necessary for crop growth and can be easily absorbed and utilized by crops, such as potassium acetate and calcium acetate, and can be used as farmland irrigation water.
DETAILED DESCRIPTION The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
Provided is a wastewater treatment method, including the following steps: S1: 20 to 200 parts by mass of adsorbent is added to 100 parts by weight of raw wastewater containing multiple organic substances and fully stirred for 5 min to 30 min to obtain a suspension of the adsorbent and the water. The adsorbent is an alkaline adsorbent, the adsorbent is slag ash, and the slag ash includes, but is not limited to, slag ash of a furfural slag burning boiler, slag ash of a biomass power plant and slag ash of a coal power plant.
S2: The suspension is extracted and subjected to pressure filtration to realize solid-liquid separation, the obtained clear liquid phase is further treated, the solid adsorbent phase of which the moisture content is 20% to 25% is stacked for a period of time to volatilize part of moisture until the moisture content is reduced to about 14% to 16%, then the adsorbent and boiler fuel are mixed in proportion and burnt, the adsorbed organic pollutants are burnt to generate carbon dioxide and water, the adsorbed moisture is vaporized, and the adsorbent is regenerated and recycled after being discharged from the furnace. The solid adsorbent phase of which the moisture content is 14% to 16% after adsorption accounts for 5% to 10% of the boiler fuel by mass, and the regenerated adsorbent after burning is recycled after being discharged from the furnace.
S3: The effluent water of a filter press in S2 is adsorbed with the adsorbent, and the operation steps are the same as those in the treatment method of the raw wastewater in S1 and S2. That is, 20 parts by mass to 200 parts by mass of adsorbent is added to 100 parts by mass of effluent water of the filter press and fully stirred for 5 min to 30 min to obtain an aqueous suspension of the adsorbent. The aqueous suspension is delivered into the filter press for solid-
liquid separation to obtain an aqueous phase and a solid adsorbent phase, the solid adsorbent phase and boiler fuel are mixed in proportion in S2 and delivered into the boiler furnace and burnt and regenerated, and the PH value of the obtained aqueous phase is measured. If the PH value reaches about 6 to 8, further absorption treatment on the aqueous phase is stopped.
The aqueous phase is an aqueous solution rich in salts such as potassium acetate and calcium acetate, and is used as a water-soluble fertilizer for farmland irrigation. If the PH value of the aqueous phase is lower than 6, the aqueous phase is treated with the adsorbent until the PH value of the aqueous phase reaches 6 to 8.
Embodiment 1 20 g of slag ash of a biomass power plant was added to 100 g of tower bottom wastewater (PH =3.14) obtained in furfural production and fully stirred for 5 min, and then, suction filtration was performed to obtain 77 ml of filtrate ( PH =4.5). 77 g of slag ash of the biomass power plant was added into the filtrate and fully stirred for 15 min, and suction filtration was performed to obtain 60 ml of colorless and odorless filtrate (PH =7.3) containing 1.2 wt% of potassium acetate and 0.3 wt% of calcium acetate. The adsorbent of which the moisture content was 20% naturally evaporates part of moisture in the air until the moisture content was about 15 wt% and then, the adsorbent and fuel were mixed and delivered into a boiler furnace and burnt, thereby removing the adsorbed pollutants and regenerating the slag ash at the same time. Embodiment 2 100 g of slag ash of a biomass power plant was added to 100 g of tower bottom wastewater (PH =3.14) obtained in furfural production and fully stirred for 15 min, and then, suction filtration was performed to obtain 79 ml of filtrate (PH =4.4). 79 g of slag ash of the biomass power plant was added into the filtrate and fully stirred for 15 min, and suction filtration was performed to obtain 61 ml of colorless and odorless filtrate (PH =7.4) containing 1.5 wt% of potassium acetate and 0.36 wt% of calcium acetate. The adsorbent of which the moisture content was 22% naturally evaporates part of moisture in the air until the moisture content was about 15 wt% and then, the adsorbent and fuel were mixed and delivered into a boiler furnace and burnt, thereby removing the adsorbed pollutants and regenerating the slag ash at the same time. Embodiment 3 200 g of slag ash of a coal power plant was added to 100 g of tower bottom wastewater
(PH =3.14) obtained in furfural production and fully stirred for 30 min, and then, suction filtration was performed to obtain 76 ml of filtrate (PH =4.8). 76 g of slag ash of the coal power plant was added into the filtrate and fully stirred for 15 min, and suction filtration was performed to obtain 59 ml of colorless and odorless filtrate (PH =7.2) containing 0.5 wt? 5 of potassium acetate and 0.2 wt% of calcium acetate. The adsorbent of which the moisture content was 25% naturally evaporates part of moisture in the air until the moisture content was about 15 wt% and then, the adsorbent and fuel were mixed and delivered into a boiler furnace and burnt, thereby removing the adsorbed pollutants and regenerating the slag ash at the same time.
In the descriptions of this specification, the description of a reference term such as "an embodiment", "an example", or "a specific example" means that a specific feature, structure, material, or characteristic that is described with reference to the embodiment or the example is included in at least one embodiment or example of the present invention. In this specification, exemplary descriptions of the foregoing terms do not necessarily refer to the same embodiment or example. In addition, the described specific features, structures, materials, or characteristics may be combined in a proper manner in any one or more of the embodiments or examples.
The foregoing displays and describes basic principles, main features of the present invention and advantages of the present invention. Those skilled in the art can understand that the present invention is not limited to the foregoing embodiments. Descriptions in the embodiments and this specification only illustrate the principles of the present invention. Various modifications and improvements will be made in the present invention without departing from the spirit and the scope of the present invention, and these modifications and improvements shall fall within the protection scope of the present invention.
Claims (5)
1. À wastewater treatment method, comprising the following steps: S1: mixing and stirring: mixing and stirring an alkaline adsorbent and wastewater containing acetic acid in proportion to transfer colored odorous organic pollutants in the wastewater into the alkaline adsorbent, enabling alkaline substances in the alkaline adsorbent to react with acetic acid to generate acetate dissolving in water, performing filtration to obtain an aqueous phase containing the acetate and a wet solid phase of the alkaline adsorbent containing the colored odorous organic pollutants, mixing the wet solid phase of the alkaline adsorbent and fuel, delivering the mixture into a boiler furnace to burn the pollutants therein to regenerate and recycle the alkaline adsorbent, and treating the aqueous phase obtained by filtration with the alkaline adsorbent until approaching neutrality; S2: filtration: performing filtration to obtain an aqueous phase containing the acetate and a wet solid phase of the alkaline adsorbent containing the colored odorous organic pollutants, mixing the wet solid phase of the alkaline adsorbent and fuel, and delivering the mixture into the boiler furnace to burn the pollutants therein to regenerate and recycle the alkaline adsorbent; and S3: adsorbent treatment: treating the aqueous phase obtained by filtration with the alkaline adsorbent until reaching neutrality.
2. The wastewater treatment method according to claim 1, wherein the alkaline adsorbent is slag ash, and the slag ash is: slag ash of a furfural slag burning boiler or slag ash of a biomass power plant or slag ash of a coal power plant.
3. The wastewater treatment method according to claim 1, wherein a mass ratio of the wastewater containing acetic acid to the alkaline adsorbent is 5:(1-10).
4. The wastewater treatment method according to claim 1, wherein time for the mixing and stirring is 5-30 min.
5. The wastewater treatment method according to claim 1, wherein the wet solid phase of the adsorbent after filtration in the S2 and the fuel are mixed and then delivered into the boiler furnace and burnt, the organic pollutants are burnt, the adsorbed moisture is vaporized, the adsorbent is regenerated and recycled, and the aqueous phase obtained after solid-liquid separation is adsorbed with the adsorbent until the PH of the aqueous phase is 6 to 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110323834.6A CN113072124A (en) | 2021-03-26 | 2021-03-26 | Wastewater treatment method |
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| Publication Number | Publication Date |
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| LU500327B1 true LU500327B1 (en) | 2022-01-07 |
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| LU500327A LU500327B1 (en) | 2021-03-26 | 2021-06-24 | Wastewater treatment method |
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| CN (1) | CN113072124A (en) |
| LU (1) | LU500327B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113072124A (en) * | 2021-03-26 | 2021-07-06 | 安徽理工大学 | Wastewater treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1300719A (en) * | 1999-12-22 | 2001-06-27 | 溧阳市河海起重设备有限公司 | Burn cracking process and equipment for treating high-concentration organic sewage |
| CN1282615C (en) * | 2004-12-24 | 2006-11-01 | 长春市佳辰环保设备有限公司 | Process for treating industrial waste water from production of furfural |
| CN101966447A (en) * | 2010-09-27 | 2011-02-09 | 北京服装学院 | Adsorbent and application thereof to wool dyeing wastewater recycling technology |
| CN103011506B (en) * | 2012-12-12 | 2013-10-09 | 山东绿健生物技术有限公司 | Treatment method of xylose production wastewater |
| CN102992553B (en) * | 2012-12-31 | 2014-09-17 | 黄河三角洲京博化工研究院有限公司 | Method for comprehensively treating and utilizing dissolving pulp black liquor |
| KR20150032400A (en) * | 2013-09-17 | 2015-03-26 | (주)알티아이엔지니어링 | Recovery method of high-purity Ruthenium |
| CN104003461B (en) * | 2014-06-06 | 2016-03-23 | 淮南市明月环保科技有限责任公司 | A kind of burning regeneration organic wastewater treating system |
| CN111675407A (en) * | 2020-05-18 | 2020-09-18 | 南京工业大学 | Treatment method of low-concentration acetic acid wastewater |
| CN113072124A (en) * | 2021-03-26 | 2021-07-06 | 安徽理工大学 | Wastewater treatment method |
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- 2021-03-26 CN CN202110323834.6A patent/CN113072124A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113072124A (en) * | 2021-03-26 | 2021-07-06 | 安徽理工大学 | Wastewater treatment method |
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Effective date: 20220107 |