CN112897806A - River channel dephosphorization process - Google Patents
River channel dephosphorization process Download PDFInfo
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- CN112897806A CN112897806A CN202110071234.5A CN202110071234A CN112897806A CN 112897806 A CN112897806 A CN 112897806A CN 202110071234 A CN202110071234 A CN 202110071234A CN 112897806 A CN112897806 A CN 112897806A
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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
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0225—Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
- B01J20/0229—Compounds of Fe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28042—Shaped bodies; Monolithic structures
- B01J20/28045—Honeycomb or cellular structures; Solid foams or sponges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/305—Addition of material, later completely removed, e.g. as result of heat treatment, leaching or washing, e.g. for forming pores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3071—Washing or leaching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3433—Regenerating or reactivating of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425
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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
-
- 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
-
- 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
- C02F2101/105—Phosphorus 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention relates to a river channel dephosphorization process, which comprises the following steps: s1: pumping river water in the river channel into an adsorption tank, and weighing sponge iron which accounts for 1/60-1/10 of the weight of the river water in the adsorption tank; s2: immersing sponge iron in a dilute sulfuric acid solution for 0.5-1 h, and then cleaning the sponge iron by using clear water to obtain modified sponge iron; s3: adding the modified sponge iron into an adsorption tank at the temperature of 20-30 ℃, and continuously stirring the adsorption tank for 2-6 hours; s4: the river water which is processed by the step S3 passes through an anaerobic pool, an anoxic pool and an aerobic pool in sequence, and sludge containing phosphorus accumulating bacteria is added into the anaerobic pool; s5: and filtering the river water to complete dephosphorization. This application can make the phosphorus content of river reduce more than 95%, and sponge iron can retrieve and recycle, can not produce a large amount of mud.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a river channel dephosphorization process.
Background
When excessive nitrogen and phosphorus exist in the water environment, the water quality of the water body is deteriorated and the water body is eutrophicated. The biological nitrogen and phosphorus removal technology has become a main control technology for controlling water body pollution due to mature technology and low cost, and is widely applied to the nitrogen and phosphorus removal process of sewage.
The biological denitrification process mainly comprises a nitrification process and a denitrification process. Generally, the nitrification process is to convert ammonia nitrogen into nitrate nitrogen under the action of autotrophic bacteria; in the denitrification process, the COD is utilized to denitrify the nitrate nitrogen into nitrogen under the action of heterotrophic bacteria, so that nitrogen elements can be thoroughly removed from the water body, and the total nitrogen concentration of the effluent of the biological denitrification process is reduced.
The biological phosphorus removal process consists of three processes of anaerobic phosphorus release, aerobic phosphorus absorption and sludge discharge. Phosphorus accumulating bacteria (PAOs) pass through a continuous anaerobic environment and an aerobic environment, phosphate in the body is released into the water environment by using COD under the anaerobic condition, then a large amount of phosphate in the water environment is absorbed into cells by using energy stored in the body under the aerobic condition, and finally, the PAOs rich in phosphorus in the cells are discharged from the system in the form of residual sludge, so that the biological phosphorus removal process is realized, and the total phosphorus concentration of the effluent of the biological phosphorus removal process is reduced.
However, biological phosphorus removal is only effective when the phosphorus content is low, and if the phosphorus content is too high, the phosphorus removal effect is greatly reduced, so that the biological phosphorus removal usually needs to be performed in combination with chemical phosphorus removal, and a chemical flocculant generates a large amount of sludge, which is a technical problem to be solved in the field.
Disclosure of Invention
The invention provides a river channel dephosphorization process for solving the technical problems.
The technical scheme for solving the technical problems is as follows: a process for removing phosphorus from river channels comprises the following steps:
s1: pumping river water in a river channel into an adsorption tank, and weighing sponge iron which accounts for 1/60-1/10 of the weight of the river water in the adsorption tank;
s2: immersing the sponge iron in a dilute sulfuric acid solution for 0.5-1 h, and then cleaning the sponge iron by using clear water to obtain modified sponge iron;
s3: adding the modified sponge iron into the adsorption tank at the temperature of 20-30 ℃, and continuously stirring the adsorption tank for 2-6 hours;
s4: the river water which is processed by the step S3 sequentially passes through an anaerobic pool, an anoxic pool and an aerobic pool, and sludge containing phosphorus accumulating bacteria is added into the anaerobic pool;
s5: and filtering the river water to complete dephosphorization.
The beneficial effects of the river channel dephosphorization process disclosed by the application are that: this application is got rid of through the phosphorus of sponge iron in to the river, on the one hand, sponge iron is zero valent iron, surface corrosion after being modified by sulphuric acid, precipitate the iron ion, can react with phosphate, form indissolvable salt, on the other hand, sponge iron itself has a large amount of micropores, can adsorb phosphate effectively, consequently, can get rid of most phosphorus, at this moment, phosphorus content and the significantly reduced in the river, then can obtain better dephosphorization effect through biological division method again, thereby can make the phosphorus content of river reduce more than 95% in the river course, and sponge iron can retrieve and recycle, can not produce a large amount of mud.
Further, the dilute sulfuric acid is a sulfuric acid solution with the concentration of 4-10% by weight.
Further, the step S3 is followed by the step of: and (5) taking out the modified sponge iron obtained in the step S2, washing the modified sponge iron for 2-4 times by using clear water, immersing the modified sponge iron in NaOH solution for more than 12 hours, and recovering solid substances to obtain recovered sponge iron. According to the application, the phosphate adsorbed in the modified sponge iron can be dissolved through NaOH, and after the modified sponge iron is treated through NaOH solution, the adsorption capacity of the modified sponge iron can be recovered, so that the modified sponge iron can be reused.
Further, the concentration of the NaOH solution is 20-30% wt.
Further, in the step S4, the river water is kept in the anaerobic pool for 1-3 hours.
Further, in the step S4, the river water is kept in the anoxic pond for 0.5-3 hours.
Further, in the step S4, the river water is kept in the aerobic tank for 1-5 hours.
Further, in the step S3, the stirring speed is 100 to 300 r/min.
Further, the method between the step S5 and the step S4 further comprises the steps of: and performing precipitation treatment on the river water treated in the step S4. By adding the precipitation treatment step, residual sludge and sponge iron in river water can be effectively removed, and the filtered river water can reach the discharge standard.
Further, the precipitation treatment is a standing precipitation method or an inclined tube precipitation method.
Detailed Description
The principles and features of this application are described in conjunction with the following examples, which are set forth to illustrate, but are not to be construed to limit the scope of the application.
The following discloses embodiments or examples of various implementations of the subject technology. While specific examples of one or more arrangements of features are described below to simplify the disclosure, the examples should not be construed as limiting the present disclosure, and a first feature described later in the specification in conjunction with a second feature can include embodiments that are directly related, can also include embodiments that form additional features, and further can include embodiments in which one or more additional intervening features are used to indirectly connect or combine the first and second features to each other so that the first and second features may not be directly related.
Example 1
The application discloses an embodiment of a process for removing phosphorus from a river channel, which comprises the following steps:
s1: pumping river water in the river channel into an adsorption tank by a water pump, simultaneously taking 100ml of river water as a sample, testing the phosphorus content in the river water, weighing sponge iron which accounts for 1/60 of the weight of the river water in the adsorption tank,
s2: immersing sponge iron in a dilute sulfuric acid solution with the concentration of 4 wt% for 0.5h, and then washing the sponge iron with clear water to obtain the modified sponge iron.
S3: the modified sponge iron is poured into an adsorption pool at the temperature of 20 ℃, and the adsorption pool is continuously stirred for 2 hours at the rotating speed of 100 r/min.
S4: and (4) enabling the river water subjected to the step S3 to sequentially pass through an anaerobic tank, an anoxic tank and an aerobic tank, and adding sludge containing phosphorus accumulating bacteria into the anaerobic tank, wherein the river water is kept in the anaerobic tank for 1 hour, kept in the anoxic tank for 0.5 hour and kept in the aerobic tank for 1 hour. So that the phosphorus accumulating bacteria in the sludge fully react with phosphorus in river water.
S5: and (4) filtering the river water to complete dephosphorization, taking 100ml of the river water subjected to the step S5, and testing the phosphorus content in the river water.
Example 2
The application discloses an embodiment of a process for removing phosphorus from a river channel, which comprises the following steps:
s1: pumping river water in the river channel into an adsorption tank by a water pump, simultaneously taking 100ml of river water as a sample, testing the phosphorus content in the river water, weighing sponge iron which accounts for 1/30 of the weight of the river water in the adsorption tank,
s2: immersing sponge iron in a 6 wt% dilute sulfuric acid solution for 0.5h, and then washing the sponge iron with clear water to obtain the modified sponge iron.
S3: the modified sponge iron is poured into an adsorption pool at the temperature of 25 ℃, and the adsorption pool is continuously stirred for 4 hours at the rotating speed of 200 r/min.
S4: and (4) enabling the river water subjected to the step S3 to sequentially pass through an anaerobic tank, an anoxic tank and an aerobic tank, and adding sludge containing phosphorus accumulating bacteria into the anaerobic tank, wherein the river water is kept in the anaerobic tank for 2 hours, kept in the anoxic tank for 1.5 hours and kept in the aerobic tank for 3 hours. So that the phosphorus accumulating bacteria in the sludge fully react with phosphorus in river water.
S401: and (5) injecting the river water treated in the step S4 into a sedimentation tank, and standing and settling for 6 h.
S5: and (4) filtering the river water to complete dephosphorization, taking 100ml of the river water subjected to the step S5, and testing the phosphorus content in the river water.
In this embodiment, the method further comprises the steps of taking out the modified sponge iron subjected to the step S2, washing the modified sponge iron with clear water for 2 times, immersing the modified sponge iron in a 20% wt NaOH solution for 12 hours, and recovering solids to obtain recovered sponge iron, wherein the recovered sponge iron can be reused for performing the step S3.
Example 3
S1: pumping river water in the river channel into an adsorption tank by a water pump, simultaneously taking 100ml of river water as a sample, testing the phosphorus content in the river water, weighing sponge iron which accounts for 1/10 of the weight of the river water in the adsorption tank,
s2: immersing sponge iron in 10 wt% dilute sulfuric acid solution for 1h, and then washing the sponge iron with clear water to obtain the modified sponge iron.
S3: the modified sponge iron is poured into an adsorption pool at the temperature of 30 ℃, and the adsorption pool is continuously stirred for 6 hours at the rotating speed of 300 r/min.
S4: and (3) enabling the river water subjected to the step S3 to sequentially pass through an anaerobic tank, an anoxic tank and an aerobic tank, and adding sludge containing phosphorus accumulating bacteria into the anaerobic tank, wherein the river water is kept in the anaerobic tank for 3 hours, kept in the anoxic tank for 3 hours and kept in the aerobic tank for 5 hours. So that the phosphorus accumulating bacteria in the sludge fully react with phosphorus in river water.
S401: and (4) injecting the river water treated in the step S4 into an inclined tube precipitation device to precipitate particles in the river water.
S5: and (4) filtering the river water to complete dephosphorization, taking 100ml of the river water subjected to the step S5, and testing the phosphorus content in the river water.
Comparative example:
s1: taking 100ml of river water to reserve a sample and testing the phosphorus content, then sequentially passing the river water through an anaerobic pool, an anoxic pool and an aerobic pool, and adding sludge containing phosphorus accumulating bacteria into the anaerobic pool, wherein the river water is kept in the anaerobic pool for 3 hours, kept in the anoxic pool for 3 hours and kept in the aerobic pool for 5 hours. So that the phosphorus accumulating bacteria in the sludge fully react with phosphorus in river water.
S2: and filtering the river water to remove phosphorus, taking 100ml of the filtered river water, and testing the phosphorus content in the river water.
In this embodiment, the method further comprises the steps of taking out the modified sponge iron subjected to the step S2, washing the modified sponge iron 4 times with clear water, immersing the modified sponge iron in a 30% by weight NaOH solution for 24 hours, and recovering solids to obtain recovered sponge iron, wherein the recovered sponge iron can be reused for performing the step S3.
The phosphorus removal rate is obtained by comparing the phosphorus content before and after phosphorus removal, a spectrophotometer method is adopted to test the phosphorus content in a sample, and the removal result of phosphorus in river water in each specific embodiment and each comparative example is shown in the following table:
| example 1 | Example 2 | Example 3 | Comparative example | |
| Phosphorus removal rate | 96％ | 98％ | 98％ | 64％ |
As can be seen from the above table, the phosphorus removal rate of the application is as high as 95% or more, and the phosphorus removal filtration is only 64% only by biological phosphorus removal.
This application is got rid of through the phosphorus of sponge iron in to river, on the one hand, sponge iron is zero valent iron, surface corrosion after being modified by sulphuric acid, precipitate the iron ion, can react with phosphate, form indissolvable salt, on the other hand, sponge iron itself has a large amount of micropores, can adsorb the phosphate effectively, consequently can get rid of most phosphorus, then pass through biological division method again, thereby can make the phosphorus content in the river course reduce more than 95%, and sponge iron can retrieve and recycle, can not produce a large amount of mud.
In the description of the present specification, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," 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 are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The terms used in the present specification are those general terms currently widely used in the art in consideration of functions related to the present disclosure, but they may be changed according to precedent examples of those of ordinary skill in the art or new technology in the art. Also, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the specification should not be construed as simple names but based on the meanings of the terms and the overall description of the present disclosure.
The description uses words to describe operational steps performed in accordance with embodiments of the present application. It should be understood that the operational steps in the embodiments of the present application are not necessarily performed in the exact order recited. Rather, the various steps may be processed in reverse order or simultaneously, as desired. Meanwhile, other operations may be added to the processes, or a certain step or several steps of operations may be removed from the processes.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A process for removing phosphorus from a river channel is characterized by comprising the following steps:
s1: pumping river water in a river channel into an adsorption tank, and weighing sponge iron which accounts for 1/60-1/10 of the weight of the river water in the adsorption tank;
s2: immersing the sponge iron in a dilute sulfuric acid solution for 0.5-1 h, and then cleaning the sponge iron by using clear water to obtain modified sponge iron;
s3: adding the modified sponge iron into the adsorption tank at the temperature of 20-30 ℃, and continuously stirring the adsorption tank for 2-6 hours;
s4: the river water which is processed by the step S3 sequentially passes through an anaerobic pool, an anoxic pool and an aerobic pool, and sludge containing phosphorus accumulating bacteria is added into the anaerobic pool;
s5: and filtering the river water to complete dephosphorization.
2. The process for removing phosphorus from river channels according to claim 1, wherein the dilute sulfuric acid is a sulfuric acid solution with a concentration of 4-10% by weight.
3. The process for removing phosphorus from a river according to claim 1, wherein the step S3 is further followed by the step of: and (5) taking out the modified sponge iron obtained in the step S2, washing the modified sponge iron for 2-4 times by using clear water, immersing the modified sponge iron in NaOH solution for more than 12 hours, and recovering solid substances to obtain recovered sponge iron.
4. The process for removing phosphorus from river channels of claim 3, wherein the concentration of the NaOH solution is 20-30% by weight.
5. The process for removing phosphorus from river channels in claim 1, wherein the river water in the step S4 is maintained in the anaerobic pond for 1-3 hours.
6. The process for removing phosphorus from river channels according to claim 1, wherein the river water is maintained in the anoxic tank for 0.5 to 3 hours in the step S4.
7. The process for removing phosphorus from river channels in claim 1, wherein the river water in the step S4 is kept in the aerobic tank for 1-5 hours.
8. The process for removing phosphorus from river channels according to claim 1, wherein in the step S3, the stirring speed is 100 to 300 r/min.
9. The process for removing phosphorus from river channels according to claim 1, further comprising, between the step S5 and the step S4, the steps of: and performing precipitation treatment on the river water treated in the step S4.
10. The process for removing phosphorus from a river of claim 9, wherein the precipitation treatment is a static precipitation method or an inclined tube precipitation method.
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| CN202110071234.5A CN112897806A (en) | 2021-01-19 | 2021-01-19 | River channel dephosphorization process |
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| CN202110071234.5A CN112897806A (en) | 2021-01-19 | 2021-01-19 | River channel dephosphorization process |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111392968A (en) * | 2020-03-26 | 2020-07-10 | 漳州市力天环境工程有限公司 | Multi-stage ecological treatment method for town sewage |
| CN111995053A (en) * | 2020-08-24 | 2020-11-27 | 哈尔滨工业大学 | A/A/O system based on synchronous reinforced biochemical phosphorus removal of powdered lanthanum-based adsorbent |
-
2021
- 2021-01-19 CN CN202110071234.5A patent/CN112897806A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111392968A (en) * | 2020-03-26 | 2020-07-10 | 漳州市力天环境工程有限公司 | Multi-stage ecological treatment method for town sewage |
| CN111995053A (en) * | 2020-08-24 | 2020-11-27 | 哈尔滨工业大学 | A/A/O system based on synchronous reinforced biochemical phosphorus removal of powdered lanthanum-based adsorbent |
Non-Patent Citations (2)
| Title |
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| 刘赫尊 等: "改性海绵铁深度除磷及其再生磷回收方法", 《环境科学学报》, vol. 40, no. 1, 31 January 2020 (2020-01-31), pages 147 - 154 * |
| 肖龙 等: "污水生物除磷技术研究进展", 《生物技术世界》, 31 May 2016 (2016-05-31), pages 1 - 5 * |
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Application publication date: 20210604 |