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Artificial rapid percolation system for improving treatment capability upon pollutants such as nitrogen and phosphorus in rainwater through medium modification

A technology of artificial rapid infiltration and pollutant treatment, which is applied in the fields of water pollutants, water/sewage treatment, runoff/rainwater treatment, etc. Determine the range of process parameters, low removal efficiency of pollutants such as nitrogen and phosphorus, etc., to achieve the effect of small footprint, simple structure, and improved adsorption effect

Active Publication Date: 2020-02-04
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the influence of climate and soil texture in different regions, the optimal process parameters in various places are different, resulting in no definite range of process parameters for the application of artificial rapid infiltration systems. In addition, the artificial rapid infiltration system in the prior art The removal efficiency of the infiltration system for pollutants such as nitrogen and phosphorus is still low, and the pollutants in the effluent water after the artificial rapid infiltration system have not been completely removed, resulting in eutrophication, black odor, etc. after the effluent is discharged into the natural water body Based on this, the artificial rapid infiltration system in the prior art cannot achieve the purpose of quickly and thoroughly purifying the pollutants in the rainwater runoff

Method used

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  • Artificial rapid percolation system for improving treatment capability upon pollutants such as nitrogen and phosphorus in rainwater through medium modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] according to figure 1Schematic diagram of the structure to prepare an artificial rapid infiltration system, the device is PVC plastic, the whole is a cylinder, the height is 130cm, the length and width are 60cm, the medium layer 2 is 85cm, the overflow layer 1 is 25cm, and the outlet layer 3 is 20cm , the surface of the medium layer and 30cm away from the surface are provided with water distribution pipes. The medium layer is uniformly mixed with soil, river sand, vermiculite and limestone with a particle size of less than 2cm. The addition ratio of soil and river sand is 1:1, and vermiculite The doping amount of stone is 15% of the total volume of soil and river sand, the doping amount of limestone is 8% of the total volume of soil and river sand, and the particle size of pebbles filled in the drainage layer is 2-4cm.

[0030] Measure the initial concentration of COD, ammonia nitrogen, TP, and TN in the sewage to be 173-185mg / L, 7-8mg / L, 0.3-0.4mg / L, 7.8-9.5mg / L, respe...

Embodiment 2

[0032] Same as Example 1, the difference is that the added vermiculite is modified vermiculite, modification method: natural vermiculite is sieved with 2mm, and HNO of 1mol / L is adopted 3 Stir and soak for 2 hours, take it out and rinse, remove soluble impurities, dry in an oven to constant weight, then take 10g of the above-mentioned pretreated vermiculite and chitosan, and put In the beaker, add 100ml of 1mol / L NaOH solution, stir for 24 hours, soak in distilled water, wash until the pH is constant, and dry in an oven to constant weight before use.

[0033] The average effluent concentrations of COD, ammonia nitrogen, TP, and TN in the sewage at the detection drainage were 15.29mg / L, 0.81mg / L, 0.018mg / L, and 4.21mg / L, respectively.

Embodiment 3

[0035] The same as Example 2, the difference is that only the water inlet pipe is set on the surface of the medium layer, and the water outlet is set on the drainage layer. The average effluent concentrations of COD, ammonia nitrogen, TP and TN in the sewage at the drainage site are respectively 13.42 mg / L, 0.46 mg / L, and TN. 0.0141mg / L, 6.06mg / L.

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Abstract

The invention discloses an artificial rapid percolation system for improving the treatment capability upon pollutants such as nitrogen and phosphorus in rainwater through medium modification. The system aims at the defect that a conventional artificial rapid percolation system is poor in nitrogen and phosphorus removal effect, and the removal capability of the system upon nitrogen and phosphorus is improved by modifying vermiculite with chitosan and optimizing technological parameters of the system. According to the technology, modified vermiculite is mixed with river sand soil proportionally,water is distributed once every other 48 hours with a hydraulic load of 2m / d, the water is fed once for 3 hours, falling drying is performed for 45 hours, the soil thickness is 70-100cm, the water isfed in sections at 30cm under a soil layer according to a ratio of 2:1, and up-to-standard treatment on nitrogen and phosphorus pollutants, of the artificial rapid percolation system, can be achievedunder the process conditions. In general, the system is simple in structure, small in floor space and good in treatment effect.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an artificial rapid infiltration system for improving the ability to treat pollutants such as nitrogen and phosphorus in rainwater through medium modification. Background technique [0002] Constructed rapid infiltration system (Constructed rapid infiltration system, referred to as: CRI) is a type of land treatment, which refers to the process of putting sewage on the surface of artificially constructed infiltration media in a controlled manner so that it can infiltrate downward. It undergoes different physical, chemical and biological effects, and finally achieves the purpose of purifying sewage. It is based on the research and summary of various types of land treatment and rapid infiltration systems, aiming at the common shortcomings of traditional sewage land treatment systems such as low hydraulic load and small processing capacity per unit area, it draws lessons fro...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16C02F101/10
CPCC02F9/00C02F2103/001C02F3/02C02F1/42C02F1/281C02F2101/16C02F2101/105
Inventor 王辉王沐晴卞兆勇
Owner BEIJING FORESTRY UNIVERSITY
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