CN112794416A - Flocculation-adsorption reagent and method for synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water body - Google Patents
Flocculation-adsorption reagent and method for synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water body Download PDFInfo
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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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- 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
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
-
- 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
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- 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
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
-
- 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
-
- 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
- C02F2209/11—Turbidity
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a flocculation-adsorption reagent and a method for synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water. The flocculation-adsorption agent comprises a magnetic compound flocculant and a materialized chitosan-zeolite adsorbent; the magnetic compound flocculant consists of polymeric ferric sulfate, polyacrylamide and magnetic powder; the materialized chitosan-zeolite adsorbent is formed by compounding protonated chitosan and zeolite. The black and odorous water body is treated by the flocculation-adsorption reagent, so that the turbidity, ammonia nitrogen and TP in the black and odorous water body can be efficiently removed, the turbidity and TP removal rate can reach the surface water environment quality standard IV, the ammonia nitrogen removal rate reaches the standard V, the flocculation settling time is short, the dosage is small, the magnetic powder can be recycled, and the like.
Description
Technical Field
The invention relates to an emergency treatment technology of black and odorous water, in particular to a flocculation-adsorption reagent and a flocculation-adsorption method for synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water, and belongs to the technical field of black and odorous water treatment.
Background
The rapid development of economy, the accelerated promotion of urbanization and the continuous improvement of the living standard of people lead to the continuous improvement of water consumption in the aspects of industry, agriculture, life and the like. However, at present, the sewage treatment capacity is affected by the problems of laggard, imperfect and unsound treatment industry and the like, so that a large amount of organic matters and suspended matters are discharged into water, aquatic plants such as algae and the like propagate in a large amount, aerobic microorganisms carry out aerobic decomposition on organic pollutants, and when the oxygen consumption rate is greater than the reoxygenation rate of the water, the DO concentration of the water is reduced, and the water is anoxic. Anaerobic microorganisms decompose organic matters in an anoxic environment to generate volatile substances with irritation such as hydrogen sulfide and ammonia, so that a water body smells; meanwhile, some formed metal sulfides can be attached to suspended matters, so that the water body is blackened. The black and odorous water body phenomenon not only causes the water body to lose the use value and the ecological service function, but also seriously damages the environmental landscape of the city and even threatens the physical and psychological health of residents.
How to effectively treat the black and odorous water body, remove pollutants such as suspended matters, TP, ammonia nitrogen and the like in the water body and recover the self-purification capability of the water body. The adopted method has a plurality of methods, such as bottom sediment dredging, water diversion, bioremediation and the like. The method for dredging the sediment mainly comprises the steps of taking the lake sediment away by an artificial dredging means, and effectively removing internal pollutants in a water body, but the sediment dredging technology has large engineering and high cost, generates certain negative ground influence on the inhabitants at the bottom of a river channel, and is easy to cause secondary pollution due to improper treatment of the dredged sediment; water regulation refers to a technical means of introducing a clean water source at the upstream or nearby of a lake into the lake through regulation and control of water conservancy facilities, the hydrodynamic condition of a water body can be improved through water regulation, the diffusion, purification and output of pollutants in the water body are enhanced, but the water regulation is limited by water quantity, water quality and hydrology, and the application range and degree are limited to a certain extent; bioremediation is considered as a necessary way for black and odorous water body remediation, is also an important measure for improving the environmental quality of natural water bodies for a long time, has the advantages of harmlessness and stability, but has higher requirements on pH, temperature, solvents and the like in water bodies, is difficult to store, and greatly limits the wide application of the method in black and odorous water body treatment.
The flocculation-adsorption technology is a water treatment method combining flocculation precipitation and adsorption technology, is a common technical process in wastewater treatment, has the advantages of wide application, simple process and low cost, and provides an idea for large-scale emergency treatment of black and odorous water. However, the flocculation technology has the defects of long flocculation settling time, single type of treated sewage, large using amount and the like, and the adsorption technology has the defects of strong singleness of some adsorbents, high raw material price, difficulty in realizing industrial use and the like. Therefore, the development of a process technology for efficiently and simultaneously removing pollutants in black and odorous water is an important research direction in the field of black and odorous water treatment.
Disclosure of Invention
Aiming at the defects of the existing flocculation-adsorption technology, the invention aims to provide a flocculation-adsorption reagent capable of synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water, wherein the removal rate of the flocculation-adsorption reagent on the turbidity and the TP in the black and odorous water can reach the standard of surface water environment quality IV, and the removal rate of the ammonia nitrogen reaches the standard of surface water environment quality V.
The second purpose of the invention is to provide a method for treating black and odorous water by using a magnetic compound flocculant and a materialized chitosan-zeolite adsorbent, which can realize the efficient removal of turbidity, ammonia nitrogen and TP in the black and odorous water at the same time, has the advantages of short flocculation settling time, small medicament dosage and improved decontamination capability and efficiency, overcomes the defects of excessive dosage and single pollutant treatment in the traditional method, can realize the recovery and utilization of magnetic powder and enhances the economic benefit.
In order to achieve the technical purpose, the invention provides a flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water, which comprises a magnetic compound flocculant and a materialized chitosan-zeolite adsorbent; the magnetic compound flocculant consists of polymeric ferric sulfate, polyacrylamide and magnetic powder; the materialized chitosan-zeolite adsorbent is formed by compounding protonated chitosan and zeolite.
As a preferable scheme, the magnetic compound flocculant is composed of polyferric sulfate, polyacrylamide and magnetic powder according to a mass ratio of 13-16.5: 1.5-2.5: 60-150. The magnetic compound flocculant is composed of polyferric sulfate (PFS), Polyacrylamide (PAM) and Magnetic Powder (MPs). The polyferric sulfate is thrown into the water body to have electropositivity, and can adsorb and neutralize turbidity and TP with negative electricity in the black and odorous water body to generate micro floc; the magnetic powder and the micro flocs fully collide to form magnetic flocs, so that the density of the flocs is improved; the polyacrylamide is used as a common coagulant aid with low cost, so that a bonding and bridging effect is generated among the magnetic flocs, coarse flocs with wide surfaces are generated, and the sedimentation process can be quickly completed within 1-3 min under the action of an external magnetic field.
Preferably, the magnetic powder is a commercial magnetic powder containing Fe as a main component3O4The purity is 99%, the particle size range is 500-1000 meshes, and the magnetic strength is 143.87 emu/g.
As a preferable scheme, the mass ratio of the magnetic compound flocculant to the cornified chitosan-zeolite adsorbent is 74.5-170: 0.2-1.8. The magnetic compound flocculant removes turbidity and TP in the black and odorous water body through the actions of adsorption and electric neutralization, compression of double electric layers and adsorption and bridging, the removal effect of TP is further improved through the action of electric adsorption of the protonated chitosan-zeolite, and the removal of ammonia nitrogen is realized through the action of multi-reaction superposition adsorption and ion exchange.
As a preferred embodiment, the modified chitosan-zeolite adsorbent is prepared by the following preparation method: adding chitosan into a hydrochloric acid solution, stirring for reaction, performing solid-liquid separation, washing the solid to be neutral, and drying to obtain materialized chitosan; adding the materialized chitosan and zeolite into an acetic acid solution together, stirring for reaction to form a suspension, dropwise adding the suspension into a sodium hydroxide solution, stirring for reaction, carrying out solid-liquid separation, washing the solid to be neutral, then soaking in the sodium hydroxide solution, washing, and drying to obtain the chitosan/zeolite solid-liquid composite material. Formation of-NH from chitosan by glycosylation3 +The zeolite can be physically crosslinked, the composite material formed by the zeolite and the zeolite is of a spherical structure, compared with the raw material of powdery zeolite, the zeolite can not only increase the turbidity of water,the effect of the flocculation technology on turbidity removal is influenced, the adsorption area can be increased, and the synchronous removal capacity of TP and ammonia nitrogen in the black and odorous water body is improved.
Preferably, the deacetylation degree of the chitosan is not less than 95%, and the viscosity is 100-200 mpa · s.
Preferably, the mass ratio of the modified chitosan to the zeolite is 1-3: 1.
As a preferable scheme, the mass percentage concentration of the acetic acid solution is 2-8%.
Preferably, the zeolite is artificial zeolite, the mole ratio of silicon to aluminum is 2:1, and the density is 1.9-2.3 g/cm3。
The invention also provides a method for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body by using the flocculation-adsorption reagent, which comprises the steps of firstly adding a magnetic compound flocculant into the black and odorous water for flocculation, then settling under the action of an external magnetic field, and then adding the materialized chitosan-zeolite for adsorption.
As a preferred scheme, the flocculation process comprises three stages of high speed, medium speed and low speed; the magnetic compound flocculant is added in a fast stage according to a one-stage mode, or the polyferric sulfate + magnetic powder or the polyacrylamide + magnetic powder is added in a fast stage according to a two-stage mode, and the polyferric sulfate or the polyacrylamide is added in a slow stage, or the polyferric sulfate, the magnetic powder and the polyacrylamide are added in a fast stage, a medium speed stage and a slow stage respectively according to a three-stage mode.
As a preferable scheme, the settling time in the settling process is 1-3 min.
Preferably, the adsorption time in the adsorption process is 7 hours or more.
The preparation method of the materialized chitosan-zeolite adsorbent specifically comprises the following steps:
(1) adding chitosan into 500mL of 0.01mol/L hydrochloric acid solution, stirring for 8-12 h, washing with pure water until the solution is neutral, drying, grinding, and sieving to obtain materialized chitosan for later use;
(2) adding the transformed chitosan and zeolite in the step (1) into 2-8% acetic acid solution according to the mass ratio of 1-3: 1, slowly stirring for 4-6 h, then dropwise adding the suspension into 250mL of 2mol/L NaOH solution by using a dropper to form bead precipitates, and then washing excessive alkali by using ultrapure water until the neutral state is achieved;
(3) and (3) soaking the beads formed in the step (2) in a NaOH solution with the mass concentration of 7.1%, soaking for 12-24 h, washing with ultrapure water, filtering, and freeze-drying for later use.
The invention provides a flocculation-adsorption method for synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water, which comprises the following two steps:
(1) the magnetic compound flocculation process comprises the following steps: pouring 1000mL of black and odorous water sample into a coagulation tank, wherein the initial concentration range of turbidity is 50-240 NTU, the initial concentration range of ammonia nitrogen is 2-20 mg/L, the initial concentration range of total phosphorus is 0.2-1.2 mg/L, starting a ZR4-6 type six-unit coagulation stirrer, and putting PFS, magnetic powder and PAM into the coagulation tank, wherein the dose of PFS is 13-16.5 mg/L, the dose of magnetic powder is 60-150 mg/L, the dose of PAM is 1.5-2.5 mg/L, the setting procedure is quick 1min, medium speed 2min and slow speed 10min, and the adding sequence of the magnetic compound flocculant comprises three modes: the three are added simultaneously in a one-step mode and a rapid stage; the two-section type-PFS + MPs/PAM + MPs is added in a fast stage, and PAM/PFS is added in a slow stage; the three-section PFS, MPs and PAM are respectively added at a high speed, a medium speed and a low speed, and finally the sedimentation time is 1-3 min under the action of an external magnetic field;
(2) an adsorption process: pouring 250mL of flocculated water sample into a beaker, adding 0.25-0.45 g of materialized chitosan-zeolite, setting the rotating speed at 200rmp/min, and sampling and measuring after the adsorption equilibrium time is more than 7 h; the determination method of turbidity, TP and ammonia nitrogen in the black and odorous water body respectively adopts a turbidity meter, a Nashi reagent spectrophotometry method and an ammonium molybdate spectrophotometry method for detection, the removal rate of turbidity and TP of the treated black and odorous water sample can reach the IV standard of surface water environment quality, and the removal rate of ammonia nitrogen reaches the V standard.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
(1) according to the invention, the magnetic compound flocculating agent is formed by reasonably preparing the dosages of the flocculating agent, the coagulant aid and the magnetic powder, the traditional settling time is reduced to 1-3 min from 20-30 min, the time for treating pollutants in unit time is shortened, the pollutant removal capacity and efficiency are improved, the defects of overlarge dosage and single pollutant treatment in the traditional method are overcome, the magnetic powder is recycled, and the economic benefit is enhanced.
(2) The invention utilizes the protonated chitosan to simply modify the zeolite, prepares the bifunctional adsorbent capable of simultaneously adsorbing ammonia nitrogen and TP, has wide pH application range and does not generate secondary pollutants.
(3) The invention utilizes the magnetic compound flocculant to combine with the materialized chitosan-zeolite adsorbent to simultaneously realize the high-efficiency removal of turbidity, ammonia nitrogen and TP in the black and odorous water, wherein the turbidity is reduced from 240NTU to 2.9NTU, the removal rate reaches 98.8 percent, the TP is reduced from 1.123mg/L to 0.204mg/L, the removal rate reaches 81.8 percent, the ammonia nitrogen is reduced from 10.75mg/L to 1.67mg/L, and the removal rate reaches 84.5 percent. The turbidity and the removal rate of TP can reach the standard IV of surface water environment quality, and the removal rate of ammonia nitrogen reaches the standard V of surface water environment quality.
(4) The magnetic compound flocculant and the adsorbent in the invention have the advantages of wide raw material sources, simple preparation process, low cost and easy amplification, are suitable for industrial large-scale production, and realize efficient and economic treatment of polluted water.
Drawings
Fig. 1 is SEM images of chitosan, modified chitosan, zeolite and modified chitosan-zeolite; the four figures in FIG. 1 represent respectively: (a) chitosan, (b) transformed chitosan, (c) zeolite, and (d) transformed chitosan-zeolite, wherein as can be seen from figure 1, the surface of the transformed chitosan has no obvious change, which indicates that the transformation has little influence on the structure of the chitosan; however, after the reaction between zeolite and chitosan, the three-dimensional crystal structure of zeolite is destroyed to form a soft state, and it is considered that grafting of zeolite with chitosan is successful.
Fig. 2 is a process flow diagram of a magnetic compound flocculation-materialized chitosan combined zeolite adsorption technology.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the claims.
Example 1
The preparation method of the materialized chitosan-zeolite comprises the following steps:
1) weighing 12g of chitosan, slowly stirring the chitosan with 500mL of 0.01mol/L hydrochloric acid solution for 8 hours, then washing the chitosan with pure water to be neutral, placing the chitosan in an electric heating constant-temperature air-blowing drying oven for drying for 24 hours, grinding and sieving the chitosan for later use.
2) 2g of the materialized chitosan and 2g of zeolite in the step 1) are simultaneously added into a 5% acetic acid solution, stirred for 4 hours, the suspension is dripped into 250mL of a 2mol/L NaOH solution by using a rubber head dropper to form bead precipitates, and excess alkali is washed by using ultrapure water until the solution is neutral. (and claims)
3) Soaking the beads formed in the step 2) in a NaOH solution with the mass concentration of 7.1%, soaking for 12h, washing with ultrapure water, and freeze-drying for 24h for later use.
Application example 1
Preparing 1000mL of a simulated water sample with turbidity of 240NTU, TP of 1.061mg/L and ammonia nitrogen of 10.75mg/L (wherein the turbidity concentration is prepared by kaolin, the TP concentration is prepared by potassium dihydrogen phosphate, and the ammonia nitrogen is prepared by ammonium chloride), setting a flocculation program, adding PFS 16mg/L and 100mg/L magnetic powder at a fast stage, adding PAM2.2 mg/L at a slow stage, and performing flocculation sedimentation for 3 min; pouring 250mL of flocculated water sample into different beakers, respectively adding 0.3125g of chitosan, zeolite and materialized chitosan-zeolite, setting the rotating speed at 200rmp/min, adsorbing for 7h, then sampling, and detecting turbidity, TP and ammonia nitrogen concentration by using a turbidity meter, a Nashi reagent spectrophotometry and an ammonium molybdate spectrophotometry, wherein the results are shown in Table 1
TABLE 1
Application example 2
Selecting a left trunk channel from 24 black and odorous water bodies in Hunan Poan to take water, taking 1000mL of a light black and odorous water sample of the left trunk channel, pouring the light black and odorous water sample into a coagulation tank, setting a flocculation program, adding 13.5mg/L PFS and 100mg/L magnetic powder in a fast stage, adding 1.74 mg/L PAM in a slow stage, and performing flocculation sedimentation for 3 min; pouring 250mL of flocculated water sample into a beaker, adding 0.209g of the materialized chitosan-zeolite, setting the rotating speed to be 200rmp/min, adsorbing for 7 hours, then sampling, and detecting the turbidity, the TP and the ammonia nitrogen concentration by adopting a turbidity meter, a Nashi reagent spectrophotometry and an ammonium molybdate spectrophotometry, wherein the results are shown in Table 2
TABLE 2
Application example 3
Selecting an Allogue channel in 24 black and odorous water bodies in Hunan Tan City to take water, pouring 1000mL of light black and odorous water sample of the Allogue channel into a coagulation tank, setting a flocculation program, adding PFS (PFS) 16.25mg/L and magnetic powder 100mg/L at a fast stage, adding PAM2.24mg/L at a slow stage, and performing flocculation sedimentation for 3 min; pouring 250mL of flocculated water sample into a beaker, adding 0.379g of materialized chitosan-zeolite, setting the rotating speed to be 200rmp/min, adsorbing for 7 hours, then sampling, and detecting the concentrations of turbidity, TP and ammonia nitrogen by adopting a turbidity meter, a Nashi reagent spectrophotometry and an ammonium molybdate spectrophotometry, wherein the results are shown in Table 3
TABLE 3
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art may modify or replace the above-mentioned technical content and be included in the scope of the present invention.
Claims (10)
1. The utility model provides a flocculation-adsorption reagent of turbidity, ammonia nitrogen and TP in black and odorous water body is got rid of in step which characterized in that: comprises a magnetic compound flocculant and a materialized chitosan-zeolite adsorbent; the magnetic compound flocculant consists of polymeric ferric sulfate, polyacrylamide and magnetic powder; the materialized chitosan-zeolite adsorbent is formed by compounding protonated chitosan and zeolite.
2. The flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body according to claim 1, which is characterized in that: the magnetic compound flocculant is composed of polyferric sulfate, polyacrylamide and magnetic powder according to a mass ratio of 13-16.5: 1.5-2.5: 60-150.
3. The flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body according to claim 1 or 2, which is characterized in that: the particle size range of the magnetic powder is 500-1000 meshes.
4. The flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body according to claim 1, which is characterized in that: the mass ratio of the magnetic compound flocculant to the transformed chitosan-zeolite adsorbent is 0.7-1.7: 8-18.
5. The flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body according to claim 1, which is characterized in that: the materialized chitosan-zeolite adsorbent is prepared by the following preparation method: adding chitosan into a hydrochloric acid solution, stirring for reaction, performing solid-liquid separation, washing the solid to be neutral, and drying to obtain materialized chitosan; adding the materialized chitosan and zeolite into an acetic acid solution together, stirring for reaction to form a suspension, dropwise adding the suspension into a sodium hydroxide solution, stirring for reaction, performing solid-liquid separation, washing the solid to be neutral, then soaking in the sodium hydroxide solution, washing, and drying to obtain the chitosan/zeolite composite material.
6. The flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body according to claim 5, which is characterized in that: the deacetylation degree of the chitosan is more than or equal to 95%, and the viscosity is 100-200 mpa · s.
7. The flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body according to claim 5, which is characterized in that: the mass ratio of the transformed chitosan to the zeolite is 1-3: 1.
8. The flocculation-adsorption reagent for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body according to claim 5, which is characterized in that: the mass percentage concentration of the acetic acid solution is 2-8%.
9. A method for synchronously removing turbidity, ammonia nitrogen and TP in black and odorous water by using the flocculation-adsorption reagent according to any one of claims 1 to 8, which is characterized by comprising the following steps: adding a magnetic compound flocculant into black and odorous water for flocculation, then settling under the action of an external magnetic field, and adding a mass chitosan-zeolite for adsorption.
10. The method for synchronously removing turbidity, ammonia nitrogen and TP in the black and odorous water body by using the flocculation-adsorption reagent according to claim 9, which is characterized in that: the flocculation process comprises three stages of high speed, medium speed and low speed; the magnetic compound flocculant is added in a rapid stage according to a one-stage manner, or the polyferric sulfate + magnetic powder or the polyacrylamide + magnetic powder is added in a rapid stage according to a two-stage manner, and the polyferric sulfate or the polyacrylamide is added in a slow stage, or the polyferric sulfate, the magnetic powder and the polyacrylamide are respectively added in a rapid stage, a medium speed stage and a slow stage according to a three-stage manner;
the settling time in the settling process is 1-3 min;
the adsorption time in the adsorption process is more than 7 h.
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