CN113023997A - High-hardness ammonia-containing wastewater treatment process - Google Patents
High-hardness ammonia-containing wastewater treatment process Download PDFInfo
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- CN113023997A CN113023997A CN202110393717.7A CN202110393717A CN113023997A CN 113023997 A CN113023997 A CN 113023997A CN 202110393717 A CN202110393717 A CN 202110393717A CN 113023997 A CN113023997 A CN 113023997A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F2001/007—Processes including a sedimentation step
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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
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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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Abstract
The invention discloses a process for treating high-hardness ammonia-containing wastewater, which takes the high-hardness ammonia-containing wastewater as raw water, and adds a small amount of OH into the raw water‑Injecting the solution into a first-stage sedimentation tank to obtain a sediment A and a supernatant A, and adding HCO into the supernatant A3 ‑Stirring the solution, injecting the solution into a secondary sedimentation tank to obtain sediment B and supernatant B, filtering the supernatant B, injecting the filtered supernatant B into an ammonia stripping tower for water-gas separation to obtain ammonia gas and water, and injecting the ammonia gas into an ammonia absorption tower to form concentrated ammonia water; and (4) treating the sediment A and the sediment B by a filter press to form a mud cake. The invention adopts the existing sedimentation tank to carry out hardness treatment, has simple operation means and low treatment cost, and can finish the hardness removal work; through two seatsThe water absorption tower avoids the problem of resource waste caused by the overflow of a large amount of ammonia gas; the rectification process is adopted, the ammonia gas extraction effect is excellent, the purity of the ammonia water is guaranteed in tail gas treatment, and recycling is realized.
Description
Technical Field
The invention relates to the technical field of environmental chemistry, in particular to a high-hardness ammonia-containing wastewater treatment process.
Background
In the traditional industry, the removal of the hardness in the wastewater is mainly performed by high and new technologies such as a reverse osmosis membrane, an ionic membrane and the like. The method has the advantages of high cost, limited durability of membrane equipment, difficult maintenance and relatively complex operation control.
For the wastewater containing ammonia, the prior art mainly embodies in the aspect that treatment equipment is too simple, the treatment effect is unstable, the pertinence is poor, the water content of ammonia gas is too high, and the ammonia removal rate of bottom effluent is insufficient.
Patent 201610529831.7 provides a high concentration ammonia nitrogen waste water treatment process has mainly innovated and improved through blowing at traditional method of taking off, in the course of the treatment, through throwing the auxiliary reagent that the ratio is reasonable, the prescription is reasonable, can maintain stable pH value, effectively detach impurity and suspended particle in the waste water, the formation of free NH3 with higher speed and separation realize that the ammonia is retrieved. Although the production process effectively removes the content of ammonia nitrogen in the wastewater and recovers the ammonia gas, the recovered ammonia gas has high water content, secondary utilization is not carried out, and the overall production process has high cost.
In conclusion, the prior treatment process for ammonia-containing wastewater has the problems of high treatment cost, complex operation control, no reasonable use of the treated ammonia gas and incapability of reducing the water content in the ammonia gas.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a process for treating high-hardness ammonia-containing wastewater, which has the advantages of high ammonia removal rate, stable ammonia removal effect, simple operation, low cost and low ammonia water content.
In order to achieve the purpose, the invention provides the following technical scheme, which comprises the following steps:
s1, taking high-hardness ammonia-containing wastewater as raw water, and adding a small amount of OH into the raw water-Stirring the solution;
s2, injecting the treated raw water into a primary sedimentation tank to obtain sediment A, supernatant A and partial tail gas;
s3 adding the supernatant A into HCO3 -Stirring the solution, and injecting the solution into a secondary sedimentation tank to obtain sediment B, supernatant B and partial tail gas;
s4, filtering the supernatant B, injecting the filtered supernatant B into an ammonia stripping tower, and performing water-gas separation to obtain ammonia and water;
s5, ammonia gas is injected into the ammonia absorption tower to form strong ammonia water;
s6, collecting tail gas generated in the primary sedimentation tank and the secondary sedimentation tank to a water absorption tower, and separating the tail gas after the tail gas is treated by the water absorption tower to form dilute ammonia water and acid gas;
s7, collecting the acid gas to an acid absorption tower to form acid washing liquid;
s8, injecting dilute ammonia water into an ammonia absorption tower to form strong ammonia water;
and S9, treating the sediment A and the sediment B by a filter press to form a mud cake.
Preferably, in the above process for treating high-hardness ammonia-containing wastewater, OH added in S1 is added-The solution is calcium hydroxide solution.
Preferably, in the above-mentioned process for treating high-hardness ammonia-containing wastewater, HCO in S33 -The solution is ammonium bicarbonate solution.
Preferably, in the treatment process of the high-hardness ammonia-containing wastewater, the treatment process needs to be kept closed, ammonia gas overflowing from the system is led to the water absorption tower by a fan, and dilute ammonia water is used as a blending liquid of the ammonia absorption tower to be made into concentrated ammonia water and discharged out of a boundary area.
According to the technical scheme, compared with the prior art, the invention discloses and provides the high-hardness ammonia-containing wastewater treatment process, the invention adopts the existing mature technology, namely the sedimentation tank, has simple operation means and low treatment cost, and can finish the hardness removal work; the problem of resource waste caused by overflow of a large amount of ammonia gas is solved through the two water absorption towers; the rectification process is adopted, the ammonia gas extraction effect is excellent, the purity of the ammonia water is guaranteed in tail gas treatment, and recycling is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart illustrating the working principle of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached figure 1, the invention discloses a process for treating high-hardness ammonia-containing wastewater
The invention comprises the following steps:
s1, taking high-hardness ammonia-containing wastewater as raw water, and adding a small amount of OH into the raw water-Stirring the solution;
s2, injecting the treated raw water into a primary sedimentation tank to obtain sediment A, supernatant A and partial tail gas;
s3 adding the supernatant A into HCO3 -Stirring the solution, and injecting the solution into a secondary sedimentation tank to obtain sediment B, supernatant B and partial tail gas;
s4, filtering the supernatant B, injecting the filtered supernatant B into an ammonia stripping tower, and performing water-gas separation to obtain ammonia and water;
s5, ammonia gas is injected into the ammonia absorption tower to form strong ammonia water;
s6, collecting tail gas generated in the primary sedimentation tank and the secondary sedimentation tank to a water absorption tower, and separating the tail gas after the tail gas is treated by the water absorption tower to form dilute ammonia water and acid gas;
s7, collecting the acid gas to an acid absorption tower to form acid washing liquid;
s8, injecting dilute ammonia water into an ammonia absorption tower to form strong ammonia water;
and S9, treating the sediment A and the sediment B by a filter press to form a mud cake.
In order to further optimize the technical scheme, the process can be used for pertinently treating the pure high-hardness ammonia-containing wastewater, and a set of complete process is used for finishing the treatment, recovery and purification of the specific wastewater. For wastewater that contains other materials in addition, the system may be part of a complete treatment system.
In order to further optimize the technical scheme, the stripped ammonia still has certain water content, and according to incomplete statistics, more than half of factories do not need direct ammonia, but the ammonia water has certain usage amount, so the ammonia water is considered to be prepared.
In order to further optimize the technical scheme and the hardness removal method, the traditional sedimentation tank is adopted, the operation is convenient and fast, the cost is low, and the effective hardness removal effect can be achieved.
In order to further optimize the technical scheme, the rectifying tower is used to replace the traditional equipment such as an evaporation kettle and flash evaporation kettle equipment, so that the problems of unstable evaporation effect, narrow adjustable range and the like can be solved. The great degree is guaranteed. The rectification process is adopted, the ammonia gas extraction effect is excellent, the purity of the ammonia water is guaranteed in tail gas treatment, and the significance of recycling is reflected.
The first embodiment is as follows:
injecting a high-hardness ammonia-containing wastewater stock solution into a primary sedimentation tank, injecting a calcium hydroxide solution into the primary sedimentation tank, and stirring to generate a magnesium hydroxide precipitate and a supernatant A;
injecting the supernatant A into a secondary sedimentation tank, injecting an ammonium bicarbonate solution, stirring to obtain a calcium carbonate precipitate and a supernatant B, filtering the supernatant B, and putting the supernatant B into an ammonia stripping tower for water-gas separation to obtain water and ammonia gas, wherein the high-concentration ammonia gas can be directly recovered or can be prepared into ammonia water after secondary treatment;
a tail gas collecting device is arranged above the primary sedimentation tank and the secondary sedimentation tank, tail gas is generated when the stock solution and the primary supernatant A of the calcium hydroxide solution react with the ammonium bicarbonate solution, and the generated tail gas is put into a water absorption tower through the tail gas collecting device to carry out water-gas separation and form dilute ammonia water and acidic gas; and (3) putting the acid gas into an acid absorption tower to form acid washing liquid, and putting the acid washing liquid into the stock solution after the acid washing liquid is treated by an acid system to perform acid-base neutralization.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A high-hardness ammonia-containing wastewater treatment process is characterized by comprising the following steps:
s1, taking high-hardness ammonia-containing wastewater as raw water, and adding a small amount of OH into the raw water-Stirring the solution in a stirring tank;
s2, injecting the treated raw water into a primary sedimentation tank to obtain sediment A, supernatant A and partial tail gas;
s3 adding the supernatant A into HCO3 -Stirring the solution in a stirring tank, and injecting the solution into a secondary sedimentation tank to obtain sediment B, supernatant B and partial tail gas;
s4, filtering the supernatant B, injecting the filtered supernatant B into an ammonia stripping tower, and performing water-gas separation to obtain ammonia and water;
s5, ammonia gas is injected into the ammonia absorption tower to form strong ammonia water;
s6, collecting tail gas generated in the primary sedimentation tank and the secondary sedimentation tank to a water absorption tower, and separating the tail gas after the tail gas is treated by the water absorption tower to form dilute ammonia water and acid gas;
s7, collecting the acid gas to an acid absorption tower to form acid washing liquid;
s8, injecting dilute ammonia water into an ammonia absorption tower to form strong ammonia water;
and S9, treating the sediment A and the sediment B by a filter press to form a mud cake.
2. The process of claim 1, wherein OH added in S1 is OH-The solution is calcium hydroxide solution.
3. The process for treating high-hardness ammonia-containing wastewater according to claim 1, wherein HCO in S33 -The solution is ammonium bicarbonate solution.
4. The process of claim 1, wherein the ammonia-containing wastewater is kept closed during the treatment, and the ammonia gas overflowing from the system is introduced into the water absorption tower by a fan, and the dilute ammonia water is used as a blending liquid of the ammonia absorption tower to be made into concentrated ammonia water and discharged out of the battery limits.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100414917B1 (en) * | 2003-08-09 | 2004-01-13 | 김치열 | The system & equipment for treating wastewater which contain ammonia |
| CN106823692A (en) * | 2017-03-22 | 2017-06-13 | 天华化工机械及自动化研究设计院有限公司 | A kind of ammonia-contaminated gas zero-emission and ammonia reclaiming process |
| CN207943881U (en) * | 2017-12-26 | 2018-10-09 | 广东新生环保科技股份有限公司 | A kind of ammonia regeneration circulator for lead plaster conversion |
| CN111547892A (en) * | 2020-05-22 | 2020-08-18 | 贵州大龙汇成新材料有限公司 | Treatment method of ammonia nitrogen wastewater in manganese chemical industry |
-
2021
- 2021-04-13 CN CN202110393717.7A patent/CN113023997A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100414917B1 (en) * | 2003-08-09 | 2004-01-13 | 김치열 | The system & equipment for treating wastewater which contain ammonia |
| CN106823692A (en) * | 2017-03-22 | 2017-06-13 | 天华化工机械及自动化研究设计院有限公司 | A kind of ammonia-contaminated gas zero-emission and ammonia reclaiming process |
| CN207943881U (en) * | 2017-12-26 | 2018-10-09 | 广东新生环保科技股份有限公司 | A kind of ammonia regeneration circulator for lead plaster conversion |
| CN111547892A (en) * | 2020-05-22 | 2020-08-18 | 贵州大龙汇成新材料有限公司 | Treatment method of ammonia nitrogen wastewater in manganese chemical industry |
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