CN112939007A - Preparation method of modified molecular sieve filter material - Google Patents

Preparation method of modified molecular sieve filter material Download PDF

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Publication number
CN112939007A
CN112939007A CN202110155753.XA CN202110155753A CN112939007A CN 112939007 A CN112939007 A CN 112939007A CN 202110155753 A CN202110155753 A CN 202110155753A CN 112939007 A CN112939007 A CN 112939007A
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water
molecular sieve
main body
filter material
filter column
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CN112939007B (en
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郭英明
胡耀鹏
张建民
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Shaanxi Langmingrun Environmental Protection Technology Co.,Ltd.
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Xian Polytechnic University
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/14—Type A
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/06—Inorganic material, e.g. asbestos fibres, glass beads or fibres
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/026—After-treatment
    • 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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  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Removal Of Specific Substances (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The invention discloses a preparation method of a modified molecular sieve filter material, which is implemented according to the following steps: 1. weighing a molecular sieve, washing the molecular sieve clean and drying the molecular sieve, then placing the molecular sieve in a filter column main body of a circulating filtration water inlet and outlet filter column system, and adjusting the filtration speed by adjusting the water inlet and outlet quantity to ensure that the water level of the filter column main body is balanced and continuously operated; 2. adding bivalent manganese and ammonium chloride into the filter column main body; 3. adding an oxidant into the filter column body; 4. the main body of the filter column is backwashed by an air-water backwashing system, and after the backwashing is finished, the water level of the main body of the filter column is balanced again and continuously operated; and 5, circularly operating for several days to obtain the modified molecular sieve filter material. The modified molecular sieve filter material obtained by the method has the advantages of no pollution to the environment, high removal load, long service cycle and simple preparation method, and can be directly applied to the purification treatment of high-load ammonia nitrogen and manganese in raw water.

Description

Preparation method of modified molecular sieve filter material
Technical Field
The invention belongs to the technical field of drinking water treatment, and relates to a preparation method of a modified molecular sieve filter material.
Background
In recent years, the pollution condition of the water quality of drinking water is increasingly serious due to the rapid development of the society. The indexes of the pollutants which exceed the standard include ammonia nitrogen, manganese and the like. Excessive ammonia nitrogen and manganese in drinking water bring adverse effects to human health, life, production and manufacture. The excessive content of ammonia nitrogen in the water body can cause the dissolved oxygen in the water to be reduced, the aquatic organisms are caused to die due to oxygen deficiency, meanwhile, nitrite and nitrate can be generated in the ammonia nitrogen oxidation process, and the risk of inducing cancers of a digestive system can exist due to the excessive nitrite. The excessive manganese in the water body can cause the corrosion and blockage of pipelines caused by the mass propagation of bacteria in urban pipe networks, and simultaneously, the death of the bacteria can also generate stink, thus influencing the sense and increasing the turbidity of the effluent.
At present, most of domestic and foreign researches on synchronous removal of ammonia nitrogen and manganese in drinking water sources are biological methods, contact oxidation methods and the like. The biological filter is a water treatment process capable of removing the pollutants, but the start-up period of the filter is long, so that the production practice is not facilitated; the contact oxidation method can synchronously remove ammonia nitrogen and manganese with lower load in water, but has poor removal efficiency for high-load pollutants.
In conclusion, the development of a low-cost and efficient water treatment process for high-load ammonia nitrogen and manganese in a drinking water source has become one of the problems in the drinking water treatment field. Therefore, research and development of the novel filter material for efficiently removing ammonia nitrogen and manganese in water have important significance on safety guarantee of drinking water.
Disclosure of Invention
The invention aims to provide a preparation method of a modified molecular sieve filter material, which has the characteristics of simple preparation method, no environmental pollution of the obtained filter material, and high-load ammonia nitrogen and manganese in water can be efficiently and synchronously removed.
The technical scheme adopted by the invention is that the preparation method of the modified molecular sieve filter material is characterized by comprising the following steps:
step 1, weighing a certain mass of molecular sieve, washing the molecular sieve clean and drying the molecular sieve, then placing the molecular sieve in a filter column main body of a circulating filtration inlet and outlet water filter column system, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe, and adjusting the filtration speed by adjusting the water inlet and outlet amount to ensure that the water level of the filter column main body is balanced and continuously operates;
step 2, adding bivalent manganese and ammonium chloride into the filter column main body through a Mn salt and inorganic salt quantitative adding system;
step 3, adding an oxidant into the filter column main body through an auxiliary oxidant adding system;
step 4, after the oxidant is added, the filter column main body operates for a period, then a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe are closed, the filter column main body stops water inlet and outlet, the filter column main body is back flushed through the air-water back flushing system, and after the back flushing is finished, the water level of the filter column main body is balanced again and continuously operates;
and 5, circularly operating the steps 2-4 for several days to obtain the modified molecular sieve filter material.
The invention is also characterized in that:
the molecular sieve in step 1 is 5A molecular sieve or 4A molecular sieve with chemical formula Mx[(AlxSiyO2(x+y))]·mH2O。
The filtration rate in step 1 is 4-8 m/L.
In the step 2, the bivalent manganese is specifically manganese chloride, the mass ratio of the addition amount of the manganese chloride to the molecular sieve weighed in the step 1 is 1:300, the inorganic salt is specifically ammonium chloride, and the mass ratio of the addition amount of the ammonium chloride to the molecular sieve weighed in the step 1 is 1: 300.
In the step 3, the oxidant is specifically potassium permanganate, and the mass ratio of the addition amount of the potassium permanganate to the addition amount of the manganese chloride is 1: 3.
In the step 4, in a period, the preparation of the filter material is carried out for 4-5 days at the initial stage and 2-3 days at the middle and later stages.
The backwashing in the step 4 specifically comprises the following steps: performing air flushing for 3-4min, performing air-water combined backwashing for 3-4min, and finally performing water flushing for 4-6 min.
The operation days in the step 5 are 14-90 days, the initial preparation period of the filter material is 1/3 days before the operation days, and the middle and later preparation periods of the filter material are 2/3 days after the operation days.
The invention has the beneficial effects that:
1. the modified molecular sieve filter material prepared by the invention has the advantages of no pollution to the environment, high removal load, long service cycle and simple preparation method, and can be directly applied to the purification treatment of high-load ammonia nitrogen and manganese in raw water;
2. the raw materials adopted by the invention are only 5A molecular sieves and 4A molecular sieve filter materials, and have the advantages of low cost, wide sources and easy storage.
Drawings
FIG. 1 is a schematic diagram of the construction of a filtration system used in a process for the preparation of a modified molecular sieve filter material according to the invention;
FIG. 2 is a diagram showing the effect of removing contaminants of a modified molecular sieve filter material obtained by the method for preparing a modified molecular sieve filter material according to the present invention;
in the figure, a water inlet and outlet system for circulating filtration and b, a quantitative Mn salt and inorganic salt adding system; c. an auxiliary oxidant dosing system; d. a gas-water backwashing system; 1. a water pump; 2. an overflow pipe; 3-1, a first flow meter; 3-2, a second flow meter; 3-3, a third flow meter; 3-4, a fourth flow meter; 4-1, a first valve; 4-2, a second valve; 4-3, a third valve; 4-4, a fourth valve; 4-5, a fifth valve; 5. a pipeline static mixer; 6. a water outlet pipe; 7. a filter column main body; 8. a water inlet main pipe; 9. a sampling port; 10. a medicine feeding pipe; 11. a medicine adding barrel; 12. backwashing the water inlet pipe; 13. backwashing the air inlet pipe; 14. a back-flushing air pump;
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a preparation method of a modified molecular sieve filter material, which is implemented according to the following steps:
step 1, weighing 3-10kg of chemical formula Mx[(AlxSiyO2(x+y))]·mH2Washing O5A or 4A molecular sieve with distilled water, drying at room temperature, loading into a circulating filtering column system, and opening the water inlet valve of the water inlet main pipeAnd the water outlet valve on the water outlet pipe enables the filter column main body to enter and exit water, the filter speed is adjusted by rotating the switch knobs of the two valves to adjust the water volume of the water inlet and the water outlet, the filter speed is observed by the flowmeter, the filter speed is adjusted to be 4-8m/L, and the water level of the filter column main body is balanced and continuously operates;
step 2, weighing 10-30g of manganese chloride and 10-30g of ammonium chloride solid as dosing agents, pouring the dosing agents into a dosing barrel of a Mn salt and inorganic salt quantitative dosing system, opening a valve on a dosing pipe, and opening a water pump, so that agent solution in the dosing barrel can continuously flow into the filter column main body through the water pump;
step 3, weighing 3-10g of potassium permanganate as an oxidant, pouring the potassium permanganate into a dosing barrel of an auxiliary oxidant dosing system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into the filter column through the water pump and continuously run;
step 4, after adding the oxidant, the filter column main body operates for a period, wherein the period is 4-5 days at the initial stage of the preparation of the filter material, and the period is 2-3 days at the middle and later stages of the preparation of the filter material, then a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe are closed, the filter column main body stops water inlet and outlet, a backwashing air pump in the air-water backwashing system is opened, a valve on a backwashing air inlet pipe is opened, and the filter column main body is backwashed, and the method specifically comprises the following steps: firstly, opening a back flushing air pump and a valve on a back flushing air pipe to carry out air flushing for 3-4 min; then opening a valve on a back flushing water pipe, and performing air-water combined back flushing for 3-4 min; then closing the back flushing air pump and the valve on the back flushing air pipe, and carrying out independent water flushing for 4-6 min; finally, closing a valve on a back washing water pipe, finishing back washing, after the back washing is finished, closing an air inlet pipe valve, a water inlet pipe valve and an air pump, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe, so that the filter column main body continuously enters and exits water, and adjusting the water volume of the entering and exiting water by rotating switch knobs of the two valves so as to balance the water level of the filter column main body and continuously operate;
and 5, circularly operating the steps 2-4 for 14-90 days to obtain the modified molecular sieve filter material, wherein the initial preparation period of the filter material is 1/3 days before the total operation days, and the middle and later preparation periods of the filter material are 2/3 days after the total operation days.
Pollutants are continuously added into the modified molecular sieve filter material obtained through the steps, the pollutant removing effect of the filter material is evaluated, and as can be seen from figure 2, the prepared molecular sieve filter material can continuously remove the pollutants in water, and the removing effect is good.
The invention adopts the 5A molecular sieve and the 4A molecular sieve as the filter material because the molecular sieve has lower cost and is cheap and easy to obtain; oxidizing bivalent manganese by using potassium permanganate as an oxidant to generate active manganese oxide, and loading the active manganese oxide on a molecular sieve filter material to enable the molecular sieve to have oxidability so as to finish the preparation of the modified molecular sieve filter material; the air-water backwashing system is used for periodically backwashing the filter material and enhancing the strength of the modified filter material.
The preparation of the modified molecular sieve filter material adopts a filter system, as shown in figure 1, the filter system comprises a circulating filter water inlet and outlet system a, a Mn salt and inorganic salt quantitative adding system b, an auxiliary oxidant adding system c and a gas-water back flushing system d;
the circulating filtration water inlet and outlet system a comprises a filter column main body 7, one end of the filter column main body 7 is connected with one end of the overflow pipe 2 through a thread internal thread, a raw material belt is tightly wound to prevent water leakage, and a loose joint is connected to the overflow pipe 2 to facilitate disassembly, replacement and maintenance; the other end of the overflow pipe 2 is connected with the water outlet pipe 6 by thread internal threads and is tightly wound by a raw material belt to prevent water leakage, and the filter column main body 7 is connected with the sampling port 9 by a joint and is tightly wound by the raw material belt to prevent water leakage; one end of the filter column main body 7 is also connected with a joint at one end of the water inlet main pipe 8 by a thread internal thread, a raw material belt is tightly wound to prevent water leakage, and the water inlet main pipe 8 is connected with a loose joint to facilitate disassembly, replacement and maintenance; the middle part of the water inlet main pipe 8 is provided with a pipeline static mixer 5, the lower end of the water inlet main pipe 8 is sequentially provided with a third flow meter 3-3 and a water inlet fourth valve 4-4, the other end of the water inlet main pipe 8 is connected with municipal water inlet, the lower end of the filter column main body 7 is connected with one end of the water outlet pipe 6 by using a thread internal thread, a raw material belt is tightly wound to prevent water leakage, the other end of the water outlet pipe 6 is connected into the total outlet water by using a connector and firmly bonded by using waterproof glue;
the Mn salt and inorganic salt quantitative adding system b comprises a water pump 1 connected with the other end of a water inlet main pipe 8, a water inlet of the water pump 1 is connected with one end of a chemical adding pipe 10 through a threaded joint, and a raw material belt is tightly wound to prevent water leakage; placing the other end of the dosing pipe 10 into the dosing barrel 11, and installing a first flowmeter 3-1 and a first valve 4-1 at the middle section of the dosing pipe 10;
the assembly of the auxiliary oxidant adding system c is the same as the connection mode of the Mn salt and inorganic salt quantitative adding system b;
the air-water backwashing system d comprises a backwashing water inlet pipe 12 with one end connected with municipal water inlet, the other end of the backwashing water inlet pipe 12 is connected with the lower end of the filter column main body 7 by a thread internal thread, a raw material belt is tightly wound to prevent water leakage, and a fourth flowmeter 3-4 and a third valve 4-3 are arranged on the backwashing water pipe in a discontinuous way; one end of the backflushing air pipe 16 is connected with a joint on the air pump 17; the other end of the back flushing air pipe 16 is connected with the lower end of the filter column main body 7, and a fourth flowmeter 3-4 and a third valve 4-3 are arranged on the back flushing air pipe in an interrupted mode.
Example 1
A preparation method of a modified molecular sieve filter material specifically comprises the following steps: weighing 3kg of 5A molecular sieve filter material, washing with distilled water, drying at room temperature, drying, placing into a circulating filtration water inlet and outlet filter column system from an opening at the top of a filter column main body, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe to enable the filter column main body to inlet and outlet water, adjusting the water amount of the inlet and outlet water by rotating switch knobs of the two valves to adjust the filtration rate, observing the filtration rate through a flowmeter, adjusting the filtration rate to 4m/L, and enabling the water level of the filter column main body to be balanced and continuously run; respectively and quantitatively weighing 10g of solid manganese chloride and 10g of solid ammonium chloride as dosing agents, pouring the dosing agents into a dosing barrel of a quantitative Mn salt and inorganic salt dosing system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; quantitatively weighing 3g of potassium permanganate solid as an adding agent, pouring the adding agent into a dosing barrel of an auxiliary oxidant adding system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; after the step is continuously operated for 4d, closing a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe, stopping water inlet and outlet of the filter column main body, opening a backwashing air pump in the air-water backwashing system, opening a backwashing air inlet pipe and a valve on the backwashing water inlet pipe, performing backwashing in the filter column, after the backwashing is finished, closing the air inlet pipe valve, the water inlet pipe valve and the air pump, opening the water inlet valve on the water inlet main pipe and the water outlet valve on the water outlet pipe, continuously feeding water into and discharging the filter column main body, and adjusting the water volume of the inlet water and the outlet water by rotating switch knobs of the two valves to balance the water level of the filter column main body and continuously operate; and circulating the steps for 25d to prepare the modified molecular sieve filter material.
Example 2
A preparation method of a modified molecular sieve filter material specifically comprises the following steps: weighing 5kg of 5A molecular sieve filter material, washing with distilled water, drying at room temperature, drying, placing into a circulating filtration water inlet and outlet filter column system from an opening at the top of a filter column main body, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe to enable the filter column main body to inlet and outlet water, adjusting the water amount of the inlet and outlet water by rotating switch knobs of the two valves to adjust the filtration rate, observing the filtration rate through a flowmeter, adjusting the filtration rate to 4m/L, and enabling the water level of the filter column main body to be balanced and continuously run; respectively and quantitatively weighing 17g of solid manganese chloride and ammonium chloride as dosing agents, pouring the dosing agents into a dosing barrel of a quantitative Mn salt and inorganic salt dosing system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; quantitatively weighing 5g of potassium permanganate solid as a dosing agent, pouring the dosing agent into a dosing barrel of an auxiliary oxidant dosing system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; after the step is continuously operated for 4d, closing a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe, stopping water inlet and outlet of the filter column main body, opening a backwashing air pump in the air-water backwashing system, opening a backwashing air inlet pipe and a valve on the backwashing water inlet pipe, performing backwashing in the filter column, after the backwashing is finished, closing the air inlet pipe valve, the water inlet pipe valve and the air pump, opening the water inlet valve on the water inlet main pipe and the water outlet valve on the water outlet pipe, continuously feeding water into and discharging the filter column main body, and adjusting the water volume of the inlet water and the outlet water by rotating switch knobs of the two valves to balance the water level of the filter column main body and continuously operate; and circulating the steps for 27d to prepare the modified molecular sieve filter material.
Example 3
A preparation method of a modified molecular sieve filter material specifically comprises the following steps: weighing 7kg of 5A molecular sieve filter material, washing with distilled water, drying at room temperature, placing into a circulating filtration water inlet and outlet filter column system from an opening at the top of a filter column main body after drying, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe to enable the filter column main body to inlet and outlet water, adjusting the water amount of the inlet and outlet water by rotating switch knobs of the two valves to adjust the filtration rate, observing the filtration rate through a flowmeter, adjusting the filtration rate to 4m/L, and enabling the water level of the filter column main body to be balanced and continuously run; respectively and quantitatively weighing 23g of manganese chloride and ammonium chloride solids as dosing agents, pouring the dosing agents into a dosing barrel of a quantitative Mn salt and inorganic salt dosing system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; quantitatively weighing 7g of potassium permanganate solid as an adding agent, pouring the adding agent into a dosing barrel of an auxiliary oxidant adding system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; after the step is continuously operated for 4d, closing a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe, stopping water inlet and outlet of the filter column main body, opening a backwashing air pump in the air-water backwashing system, opening a backwashing air inlet pipe and a valve on the backwashing water inlet pipe, performing backwashing in the filter column, after the backwashing is finished, closing the air inlet pipe valve, the water inlet pipe valve and the air pump, opening the water inlet valve on the water inlet main pipe and the water outlet valve on the water outlet pipe, continuously feeding water into and discharging the filter column main body, and adjusting the water volume of the inlet water and the outlet water by rotating switch knobs of the two valves to balance the water level of the filter column main body and continuously operate; and circulating the steps for 29d to prepare the modified molecular sieve filter material.
Example 4
A preparation method of a modified molecular sieve filter material specifically comprises the following steps: weighing 9kg of 5A molecular sieve filter material, washing with distilled water, drying at room temperature, placing into a circulating filtration water inlet and outlet filter column system from an opening at the top of a filter column main body after drying, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe to enable the filter column main body to inlet and outlet water, adjusting the water amount of the inlet and outlet water by rotating switch knobs of the two valves to adjust the filtration rate, observing the filtration rate through a flowmeter, adjusting the filtration rate to 4m/L, and enabling the water level of the filter column main body to be balanced and continuously run; respectively and quantitatively weighing 30g of solid manganese chloride and 30g of solid ammonium chloride as dosing agents, pouring the dosing agents into a dosing barrel of a quantitative Mn salt and inorganic salt dosing system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; quantitatively weighing 10g of potassium permanganate solid as an adding agent, pouring the adding agent into a dosing barrel of an auxiliary oxidant adding system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; after the step is continuously operated for 4d, closing a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe, stopping water inlet and outlet of the filter column main body, opening a backwashing air pump in the air-water backwashing system, opening a backwashing air inlet pipe and a valve on the backwashing water inlet pipe, performing backwashing in the filter column, after the backwashing is finished, closing the air inlet pipe valve, the water inlet pipe valve and the air pump, opening the water inlet valve on the water inlet main pipe and the water outlet valve on the water outlet pipe, continuously feeding water into and discharging the filter column main body, and adjusting the water volume of the inlet water and the outlet water by rotating switch knobs of the two valves to balance the water level of the filter column main body and continuously operate; and (5) circulating the steps for 32d to prepare the modified molecular sieve filter material.
Example 5
A preparation method of a modified molecular sieve filter material specifically comprises the following steps: weighing 10kg of 5A molecular sieve filter material, washing with distilled water, drying at room temperature, placing into a circulating filtration water inlet and outlet filter column system from an opening at the top of a filter column main body after drying, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe to enable the filter column main body to inlet and outlet water, adjusting the water amount of the inlet and outlet water by rotating switch knobs of the two valves to adjust the filtration rate, observing the filtration rate through a flowmeter, adjusting the filtration rate to 4m/L, and enabling the water level of the filter column main body to be balanced and continuously run; respectively and quantitatively weighing 30g of solid manganese chloride and 30g of solid ammonium chloride as dosing agents, pouring the dosing agents into a dosing barrel of a quantitative Mn salt and inorganic salt dosing system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; quantitatively weighing 10g of potassium permanganate solid as an adding agent, pouring the adding agent into a dosing barrel of an auxiliary oxidant adding system, opening a valve on a dosing pipe, and opening a water pump, so that a medicament solution in the dosing barrel can continuously flow into a filter column through the water pump and continuously run; after the step is continuously operated for 4d, closing a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe, stopping water inlet and outlet of the filter column main body, opening a backwashing air pump in the air-water backwashing system, opening a backwashing air inlet pipe and a valve on the backwashing water inlet pipe, performing backwashing in the filter column, after the backwashing is finished, closing the air inlet pipe valve, the water inlet pipe valve and the air pump, opening the water inlet valve on the water inlet main pipe and the water outlet valve on the water outlet pipe, continuously feeding water into and discharging the filter column main body, and adjusting the water volume of the inlet water and the outlet water by rotating switch knobs of the two valves to balance the water level of the filter column main body and continuously operate; and circulating the steps for 35d to prepare the modified molecular sieve filter material.

Claims (8)

1. The preparation method of the modified molecular sieve filter material is characterized by comprising the following steps:
step 1, weighing a certain mass of molecular sieve, washing the molecular sieve clean and drying the molecular sieve, then placing the molecular sieve in a filter column main body of a circulating filtration inlet and outlet water filter column system, opening a water inlet valve on a water inlet main pipe and a water outlet valve on a water outlet pipe, and adjusting the filtration speed by adjusting the water inlet and outlet amount to ensure that the water level of the filter column main body is balanced and continuously operates;
step 2, adding bivalent manganese and ammonium chloride into the filter column main body through a Mn salt and inorganic salt quantitative adding system;
step 3, adding an oxidant into the filter column main body through an auxiliary oxidant adding system;
step 4, after the oxidant is added, the filter column main body operates for a period, then a water inlet valve on the water inlet main pipe and a water outlet valve on the water outlet pipe are closed, the filter column main body stops water inlet and outlet, the filter column main body is back flushed through the air-water back flushing system, and after the back flushing is finished, the water level of the filter column main body is balanced again and continuously operates;
and 5, circularly operating the steps 2-4 for several days to obtain the modified molecular sieve filter material.
2. The method for preparing a modified molecular sieve filter material according to claim 1, wherein the molecular sieve in step 1 is a 5A molecular sieve or a 4A molecular sieve having a chemical formula of Mx[(AlxSiyO2(x+y))]·mH2O。
3. The method for preparing a modified molecular sieve filter material according to claim 1, wherein the filtration rate in step 1 is 4-8 m/L.
4. The preparation method of the modified molecular sieve filter material according to claim 1, wherein the divalent manganese in the step 2 is specifically manganese chloride, the mass ratio of the addition amount of the manganese chloride to the molecular sieve weighed in the step 1 is 1:300, the inorganic salt is specifically ammonium chloride, and the mass ratio of the addition amount of the ammonium chloride to the molecular sieve weighed in the step 1 is 1: 300.
5. The preparation method of the modified molecular sieve filter material according to claim 1, wherein the oxidant in the step 3 is specifically potassium permanganate, and the mass ratio of the addition amount of the potassium permanganate to the addition amount of the manganese chloride is 1: 3.
6. The method for preparing a modified molecular sieve filter material according to claim 1, wherein one cycle in the step 4 is 4-5 days in the initial stage of the preparation of the filter material and 2-3 days in the middle and later stages of the preparation of the filter material.
7. The method for preparing a modified molecular sieve filter material according to claim 1, wherein the backwashing in the step 4 specifically comprises: performing air flushing for 3-4min, performing air-water combined backwashing for 3-4min, and finally performing water flushing for 4-6 min.
8. The method for preparing the modified molecular sieve filter material of claim 1, wherein the running days in the step 5 are 14-90 days, the initial stage of the preparation of the filter material is 1/3 days before the running days, and the middle and later stages of the preparation of the filter material are 2/3 days after the running days.
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