CN107162334B - Method for removing organic matters in micro-polluted source water based on biological purification filter column - Google Patents

Abstract

A method for removing organic matter in micro-polluted water source water based on a biological purification filter column, and a method for removing organic matter in micro-polluted water source water. technical issues. The method includes: 1. construction of a biological purification filter column system; 2. culturing heterotrophic microorganisms that degrade organic matter and manganese oxidizing bacteria that catalyze manganese oxidation in the biological purification filter column; 3. operation of the biological purification filter column system. The invention has high removal efficiency when removing organic matter in slightly polluted water source water, realizes efficient and stable removal of organic matter in water source water, and the organic matter in effluent is obviously lower than the national drinking water standard, which is beneficial to practical engineering application.

Description

A method for removing organic matter in slightly polluted water source water based on biological purification filter column

technical field

The invention relates to a method for removing organic matter in slightly polluted water source water, and belongs to the field of drinking water treatment.

Background technique

Water is an indispensable resource for human survival and production activities. With the rapid growth of the population, the rapid development of the economy and the continuous improvement of people's living standards, the demand for water resources is gradually increasing. However, with the use of a large number of pesticides and fertilizers in the process of industrial and agricultural production, and the discharge of domestic sewage and industrial "three wastes" without strict treatment, the organic pollutants detected in the water source water are increasing day by day, including pesticides, chemical raw materials, drugs, etc. Personal care products and endocrine disruptors, etc. Among them, although the concentration of many pollutants is low, they are difficult to biodegrade and are extremely harmful. The number of toxicological indicators on organic pollution in the "Sanitation Standards for Drinking Water" promulgated by the Ministry of Health in 2006 has increased to 53 items. How to efficiently remove trace organic pollutants in slightly polluted water source water has become a hot issue in drinking water treatment.

The existing biological method for removing organic matter in slightly polluted water source water has the advantages of simple process flow, stable operation, low investment cost and small footprint, but the removal effect is not ideal.

SUMMARY OF THE INVENTION

The present invention aims to solve the technical problem of low removal rate of the existing biological method for removing organic matter in micro-polluted water source water, and provides a method for removing organic matter in micro-polluted water source water based on a biological purification filter column.

The method for removing organic matter in the micro-polluted water source water based on the biological purification filter column of the present invention is carried out according to the following steps:

1. Construction of the biological purification filter column system: The biological purification filter column system consists of a filter column, a first water tank, a second water tank, a third water tank, a first water pump, a second water pump, a third water pump and a mixer. The lower part of the filter column is a supporting layer, above the supporting layer is a filter material layer, an overflow port is set at the upper end of the filter column 1, a water outlet is set at the bottom of the filter column, and a sampling port is set on the side wall of the filter column; A first water pump is arranged on the pipeline between the water tank and the mixer, a second water pump is arranged on the pipeline between the second water tank and the mixer, and a third water pump is arranged on the pipeline between the third water tank and the mixer, and the mixer is arranged in the the top of the filter column;

Second, the start of the biological purification filter column system:

a. Inject tap water into the first water tank, and inject the river water inoculated with heterotrophic bacteria into the second water tank; inject the tap water and the river water inoculated with heterotrophic bacteria in a volume ratio of (5 to 6): 1 through the first water pump and the second water pump Mix in the mixer, flow into the filter column after mixing, control the filtration rate to be 4-5m/h, and finally discharge from the water outlet at the bottom of the filter column 1; when the removal rate of COD in the effluent is greater than 40%, the first stage is completed. start up;

b. The first water tank is filled with tap water, the second water tank is injected with the river water inoculated with manganese oxidizing bacteria, the third water tank is injected with manganese sulfate solution, and the tap water and the river water inoculated with manganese oxidizing bacteria are injected into the first water pump, the second water pump and the third water pump by the first water pump, the second water pump and the third water pump It is mixed with manganese sulfate solution into the mixer, wherein the concentration of manganese sulfate solution in the mixed solution is 0.5～0.6mg/L, the mixed solution flows into the filter column, and the filtration rate is controlled to be 4～5m/h. Discharge from the water outlet; when the removal rate of manganese ions is greater than 90%, increase the concentration of manganese sulfate solution in the mixed solution to 1.0-1.1 mg/L, and then run until the removal rate of manganese ions is greater than 90%, and then add The concentration of the medium manganese sulfate solution is increased to 1.8-2 mg/L, and then the operation is carried out until the removal rate of manganese ions is greater than 90%, and the start-up of the second stage is completed;

3. Operation of the biological purification filter column system:

The micro-polluted water source water to be treated in the first water tank is passed into the mixer through the first water pump, the second water pump and the third water pump stop working, the water flows into the filter column, and the filtration speed is controlled to be 4-5m/h, and finally It is discharged from the water outlet at the bottom of the filter column to complete the treatment of the slightly polluted water source water.

The method of the invention realizes the catalytic oxidation of the organic matter by the biological manganese oxide and the biological oxidation of the organic matter by the heterotrophic bacteria in the biological purification filter column, thereby improving the removal effect of the organic matter. When the biological purification filter column is used to remove manganese in the water body, the divalent manganese in the water is adsorbed by the biological manganese oxides on the filter material and oxidized into high-priced biological manganese oxides. The particle size of the biological manganese oxide is at the nanometer level and has a large specific surface area. It is an oxidizing component with strong oxidizing ability, and it plays an important role in the migration and transformation of trace organic matter. After the biological manganese oxide catalyzes the oxidation of organic matter, it is itself reduced to manganese ions, and the generated manganese ions can still be oxidized to manganese oxides by manganese oxidizing bacteria, so that organic matter can be degraded continuously and effectively, and the oxidation products of organic matter can also be oxidized. Microorganisms utilize for further metabolic degradation. Therefore, when the biological purification filter column is used to remove organic matter and manganese synchronously, a large amount of biological manganese oxides will be generated on the filter material, and the catalytic oxidation ability of these biological manganese oxides will be fully utilized. Oxidation will greatly improve the removal effect of organic matter in slightly polluted water source water.

The invention has high removal efficiency when removing organic matter in slightly polluted water source water, realizes efficient and stable removal of organic matter in water source water, and the organic matter in effluent is obviously lower than the national drinking water standard, which is beneficial to practical engineering applications.

Description of drawings

Fig. 1 is the schematic diagram of the biological purification filter column system of the present invention; the construction of the biological purification filter column system: the biological purification filter column system is composed of 1 as the filter column, 2 as the first water tank, 3 as the second water tank, and 4 as the third water tank , 5 is the first water pump, 6 is the second water pump, 7 is the third water pump, 8 is the mixer, 9 is the flow meter; 1-1 is the supporting layer 1-1, the filter 1-2 is the material layer, 1- 3 is the overflow port, 1-4 is the water outlet, and 1-5 is the sampling port;

Fig. 2 is the removal effect diagram of organic matter in the first start-up stage in test 1;

Figure 3 is a diagram of the removal effect of organic matter in the second start-up stage in Experiment 1

FIG. 4 is a graph showing the removal effect of manganese in the second start-up stage in Experiment 1. FIG.

Detailed ways

Embodiment 1: The method for removing organic matter in micro-polluted water source water based on a biological purification filter column of the present embodiment is carried out according to the following steps:

1. Construction of biological purification filter column system: The biological purification filter column system consists of filter column 1, first water tank 2, second water tank 3, third water tank 4, first water pump 5, second water pump 6, third water pump 7 and The mixer 8 is composed, the lower part in the filter column 1 is the supporting layer 1-1, the above the supporting layer is the filter material layer 1-2, the upper end of the filter column 1 is provided with an overflow port 1-3, The bottom of 1 is provided with water outlet 1-4, and the side wall of filter column 1 is provided with sampling port 1-5; the pipeline between the first water tank 2 and the mixer 8 is provided with the first water pump 5, the second water tank 3 and the mixer A second water pump 6 is arranged on the pipeline between 8, and a third water pump 7 is arranged on the pipeline between the third water tank 4 and the mixer 8, and the mixer 8 is arranged on the top of the filter column 1;

Second, the start of the biological purification filter column system:

A, the first water tank 2 is injected with tap water, the second water tank 3 is injected into the river water inoculated with heterotrophic bacteria; by the first water pump 5 and the second water pump 6, tap water, the river water inoculated with heterotrophic bacteria are (5～6 ): 1 is injected into the mixer 8 and mixed, and after mixing, it flows into the filter column 1, and the filtration rate is controlled to be 4-5m/h, and finally discharged from the water outlet 1-4 at the bottom of the filter column 1; when the removal rate of COD in the effluent is greater than After 40%, complete the first phase of startup;

b, the first water tank 2 is injected with tap water, the second water tank 3 is injected into the river water inoculated with manganese oxidizing bacteria, the third water tank 4 is injected with manganese sulfate solution, and the tap water, The river water inoculated with manganese oxidizing bacteria and manganese sulfate solution are injected into mixer 8 and mixed, the concentration of manganese sulfate in the obtained mixed solution is 0.5～0.6mg/L, and the mixed solution flows into filter column 1, and the control filtration rate is 4～5m/L. h, and finally discharged from the water outlet 1-4 at the bottom of the filter column 1; when the removal rate of manganese ions is greater than 90%, increase the concentration of manganese sulfate in the mixed solution to 1.0-1.1 mg/L, and then run to the level of manganese ions. After the removal rate is greater than 90%, the concentration of manganese sulfate in the mixed solution is increased to 1.8-2 mg/L, and then the operation is carried out until the removal rate of manganese ions is greater than 90%, and the start-up of the second stage is completed;

3. Operation of the biological purification filter column system:

The micro-polluted water source water to be treated is injected into the first water tank 2, and the micro-polluted water source water to be treated in the first water tank 2 is passed into the mixer through the first water pump 5, and the second water pump 6 and the third water pump 7 are stopped. Work, the water flows into the filter column 1, the filtration rate is controlled to be 4-5m/h, and finally discharged from the water outlet 1-4 at the bottom of the filter column 1 to complete the treatment of the slightly polluted water source water.

Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the supporting layer 1-1 is supplemented by stone particles, and the particle size of the stone particles is 30-50 mm; the others are the same as Embodiment 1.

Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the filter material layer 1-2 is quartz sand, and the particle size of the quartz sand is 10-20 mm; others are the same as Embodiment 1 or 2.

Embodiment 4: The difference between this embodiment and one of Embodiments 1 to 3 is that the thickness of the filter material layer 1-2 in step 1 is 1.5-2 m; the other is the same as that of Embodiment 1 to 3.

Embodiment 5: The difference between this embodiment and one of Embodiments 1 to 4 is that the filtration rate in step 2 is 4.5 m/h; the others are the same as those of Embodiment 1 to 4.

Embodiment 6: The difference between this embodiment and one of Embodiments 1 to 5 is that the filtration rate in step 3 is 4.5 m/h; the others are the same as those of Embodiment 1 to 5.

Verify the beneficial effects of the present invention with the following tests:

Test 1: The method of removing organic matter in slightly polluted water source water based on biological purification filter column in this test is carried out according to the following steps:

1. Construction of biological purification filter column system: The biological purification filter column system consists of filter column 1, first water tank 2, second water tank 3, third water tank 4, first water pump 5, second water pump 6, third water pump 7 and The mixer 8 is composed, the lower part of the filter column 1 is a supporting layer 1-1, the supporting layer 1-1 is supplemented by stone particles with a particle size of 30-50 mm, and above the supporting layer is a filter material layer 1-1 2. The filter material layer 1-2 is quartz sand with a particle size of 10-20mm, and its thickness is 1.5m; an overflow port 1-3 is set at the upper end of the filter column 1, and a water outlet 1-3 is set at the bottom of the filter column 1. 4. Sampling ports 1-5 are set on the side wall of the filter column 1; the first water pump 5 is set on the pipeline between the first water tank 2 and the mixer 8, and the second water tank 3 and the mixer 8 on the pipeline Two water pumps 6, a third water pump 7 is arranged on the pipeline between the third water tank 4 and the mixer 8, and the mixer 8 is arranged on the top of the filter column 1;

Second, the start of the biological purification filter column system:

a, the first water tank 2 is injected with tap water, the second water tank 3 is injected into the river water inoculated with heterotrophic bacteria; the tap water and the inoculated river water with heterotrophic bacteria are injected by the first water pump 5 and the second water pump 6 in a volume ratio of 5:1 Mix in mixer 8, flow into filter column 1 after mixing, control the filtration rate to 4m/h, and finally discharge from water outlet 1-4 at the bottom of filter column 1; when the removal rate of COD in the effluent is greater than 40%, complete the first step. One-stage startup; the removal effect of organic matter during this process is shown in Figure 2;

b, the first water tank 2 is injected with tap water, the second water tank 3 is injected into the river water inoculated with manganese oxidizing bacteria, the third water tank 4 is injected with manganese sulfate solution, and the tap water, The river water inoculated with manganese oxidizing bacteria and manganese sulfate solution are injected into mixer 8 and mixed, the concentration of manganese sulfate in the obtained mixed solution is 0.5mg/L, and the mixed solution flows into filter column 1, and the control filtration rate is 4m/h, and finally from The water outlet 1-4 at the bottom of the filter column 1 is discharged; when the removal rate of manganese ions is greater than 90%, the concentration of manganese sulfate in the mixed solution is increased to 1.0mg/L, and then run until the removal rate of manganese ions is greater than 90%. , and then increase the concentration of manganese sulfate in the mixed solution to 2 mg/L, and then run until the removal rate of manganese ions is greater than 90% to complete the start-up of the second stage; in this process, the removal effect of organic matter is shown in Figure 3. The removal effect is shown in Figure 4.

3. Operation of the biological purification filter column system:

The micro-polluted water source water to be treated is injected into the first water tank 2, and then the micro-polluted water source water to be treated in the first water tank 2 is passed into the mixer through the first water pump 5, wherein the COD concentration of the micro-polluted water source water is 5 ~ 8mg/L, the second water pump 6 and the third water pump 7 stop working, the water flows into the filter column 1, and the filtration rate is controlled to be 4m/h, and finally it is discharged from the water outlet 1-4 at the bottom of the filter column 1, and the water is discharged. The concentration of organic matter is gradually reduced to 2.8mg/L ~ 2.6mg/L, and the treatment of slightly polluted water source water is completed.

For the slightly polluted water source water, the biological purification filter column system in this experiment has a removal rate of 44% to 67% for the organic matter in it. The method of this experiment realizes the efficient and stable removal of organic matter in slightly polluted water source water.

Claims (6)

1. a method for removing organic matter in slightly polluted water source water based on biological purification filter column, is characterized in that this method is carried out according to the following steps: 1. Construction of the biological purification filter column system: The biological purification filter column system consists of a filter column (1), a first water tank (2), a second water tank (3), a third water tank (4), a first water pump (5), The second water pump (6), the third water pump (7) and the mixer (8) are composed, the lower part of the filter column (1) is a supporting layer (1-1), and above the supporting layer is a filter material layer (1-1). 1-2), an overflow port (1-3) is set at the upper end of the filter column (1), a water outlet (1-4) is set at the bottom of the filter column (1), and a side wall of the filter column (1) is set Sampling ports (1-5); a first water pump (5) is arranged on the pipeline between the first water tank (2) and the mixer (8), and a first water pump (5) is arranged on the pipeline between the second water tank (3) and the mixer (8) A second water pump (6) is arranged, a third water pump (7) is arranged on the pipeline between the third water tank (4) and the mixer (8), and the mixer (8) is arranged on the top of the filter column (1); Second, the start of the biological purification filter column system: a. Inject tap water into the first water tank (2) and the river water inoculated with heterotrophic bacteria in the second water tank (3); According to the volume ratio of (5-6): 1, it is injected into the mixer (8) and mixed, and after mixing, it flows into the filter column (1), and the filtration rate is controlled to be 4-5m/h, and finally the outlet from the bottom of the filter column (1) The water outlet (1-4) is discharged; when the removal rate of COD in the effluent is greater than 40%, the start-up of the first stage is completed; b. Inject tap water into the first water tank (2), river water inoculated with manganese oxidizing bacteria in the second water tank (3), and manganese sulfate solution in the third water tank (4), through the first water pump (5), the second water pump ( 6) with the third water pump (7), tap water, the river water inoculated with manganese oxidizing bacteria and the manganese sulfate solution are injected into the mixer (8) and mixed, and the concentration of manganese sulfate in the obtained mixed solution is 0.5～0.6mg/L, and the mixed solution Flow into the filter column (1), control the filtration rate to be 4-5m/h, and finally discharge from the water outlet (1-4) at the bottom of the filter column (1); when the removal rate of manganese ions is greater than 90%, the mixed solution The concentration of manganese sulfate in the mixed solution is increased to 1.0-1.1mg/L, and then the operation is carried out until the removal rate of manganese ions is greater than 90%. The removal rate is greater than 90%, and the start-up of the second stage is completed; 3. Operation of the biological purification filter column system: The micro-polluted water source water to be treated is injected into the first water tank (2), the micro-polluted water source water to be treated in the first water tank (2) is fed into the mixer through the first water pump (5), and the second water pump (6) ) and the third water pump (7) stop working, the water flows into the filter column (1), the filtration speed is controlled to be 4-5m/h, and finally it is discharged from the water outlet (1-4) at the bottom of the filter column (1), and the completion is completed. Treatment of slightly polluted water source water. 2. a kind of method for removing organic matter in micro-polluted water source water based on biological purification filter column according to claim 1, is characterized in that in step 1, the supporting layer (1-1) is assisted by stone particles, and the stone particle diameter 30 to 50mm. 3. a kind of method for removing organic matter in micro-polluted water source water based on biological purification filter column according to claim 1 and 2, is characterized in that in step 1, filter material layer (1-2) is quartz sand, and quartz sand particle size 10 to 20 mm. 4. A method for removing organic matter in micro-polluted water source water based on a biological purification filter column according to claim 1 or 2, characterized in that in step 1, the thickness of the filter material layer (1-2) is 1.5-2 m. 5. a kind of method for removing organic matter in micro-polluted water source water based on biological purification filter column according to claim 1 and 2, is characterized in that in step 2, the filtration rate is 4.5m/h. 6. A method for removing organic matter in micro-polluted water source water based on a biological purification filter column according to claim 1 or 2, wherein the filtration rate in step 3 is 4.5m/h.

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