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Method of applying engineering wastes as PRB packing to treatment of flow-out water of farmland

A technology for application engineering and waste, applied in the field of pollutants, can solve the problems of high cost and slow processing rate, and achieve the effects of convenient operation, simple installation and low environmental risk.

Pending Publication Date: 2020-03-10
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current situation of nitrogen, phosphorus and pesticide polluted water bodies in farmland receding water, the purpose of the present invention is to overcome the problems of high cost and slow processing speed of traditional treatment methods, and provide a method of using engineering waste as PRB filler to treat farmland receding water, so that the flow through PRB's farmland water is fully in contact with active materials, so as to achieve the purpose of stably and effectively removing nitrogen, phosphorus and pesticide pollutants in farmland water.

Method used

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  • Method of applying engineering wastes as PRB packing to treatment of flow-out water of farmland
  • Method of applying engineering wastes as PRB packing to treatment of flow-out water of farmland
  • Method of applying engineering wastes as PRB packing to treatment of flow-out water of farmland

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Embodiment 1

[0029] The static adsorption method was used to study six kinds of materials, namely iron slag, limestone, corn straw biochar, magnesite slag, calcined magnesite slag and aluminum slag, to study their ability to remove nitrate nitrogen and total phosphorus. Prepare KH with pH=7, total ionic strength Ic=10mMol / L, Cp=50mg / L, CN=50mg / L 2 PO 4 -Na 2 HPO 4 and KNO 3 Mix the contaminated aqueous solutions and adjust the ionic strength with NaCl. Weigh 0.1g of each material and put it into a glass centrifuge tube with a volume of 50mL that has been added with 20mL nitrogen and phosphorus polluted aqueous solution, put it into a water bath thermostat shaker, control the temperature at 293K, and shake at a frequency of 150r / min. After 24 hours of adsorption, the supernatant was passed through a 0.45 μm filter membrane for determination. The results showed that calcined magnesite slag and iron slag had the strongest removal ability of phosphate, which were 688mg / kg and 384mg / kg res...

Embodiment 2

[0031] The method of static adsorption was used to study 6 kinds of materials, which were iron slag, limestone, corn straw biochar, magnesite slag, calcined magnesite slag and aluminum slag, and their effects on pesticides tricyclazole, rice blastling and malathion were studied. Phosphorus removal capacity. Prepare a total ionic strength Ic=10mMol / L mixed contaminated aqueous solution containing 1mg / L each of tricyclazole, rice blastin and malathion, and adjust the ionic strength with NaCl. Weigh 0.1g of each material and place it into a glass centrifuge tube with a volume of 50mL that has been added with 20mL of pesticide-contaminated aqueous solution, and shake it in a water-bath constant temperature oscillator. The temperature is controlled at 293K, and the shaking frequency is 150r / min. After 24 hours, the supernatant was taken and passed through a 0.22 μm filter membrane for determination. Straw biochar and iron slag have the strongest removal capacity for tricyclazole, ...

Embodiment 3

[0034]This embodiment selects a kind of engineering waste iron ore slag, that is, zero-valent iron filings are used as PRB fillers to treat waste water containing nitrogen, phosphorus and pesticides (30mg-N / L, 5mg-P / L, tricyclazole, rice blastling and Malathion each 1mg / L, pH 6.5-7, total ionic strength about 10mMol / L), according to the following steps: the quartz sand (purity 99.4%) with a particle size of 0.18-0.45mm is filled in the The inlet and outlet of the PRB device ensure that the contaminated solution passes through the PRB device evenly. Before filling, soak in 10mM NaOH and 10mM HCl for 6 hours to remove impurities, wash with ultrapure water until neutral, and then dry in an oven at 105°C. Screen the iron ore slag with a particle size of 0.42-0.84mm. Weigh a certain amount of iron slag and fill it in the middle 1 / 3 of the PRB device, weigh a certain amount of quartz sand and fill it in the upper and lower 1 / 3 positions, and the volume ratio of quartz sand to iron ...

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Abstract

The invention discloses a method of applying engineering wastes as PRB packing to treatment of flow-out water of farmland, the method including: performing static test to select a proper engineering waste and packing the engineering waste as an active material in a PRB reaction device; according to certain flow speed, injecting simulating farmland flow-out water into the PBR reaction device, and collecting a sample at the outlet of the PRB reaction device at certain time interval to analyze and test the nitrogen, phosphorus and pesticides in the sample. In the invention, the engineering wasteis used as a PRB active packing for in-situ remediation of the farmland flow-out water polluted by nitrogen, phosphorus and pesticides, so that the water polluted by nitrogen, phosphorus and pesticides and flowing through the PRB is fully contacted with the active material, thereby stably and effectively remediating the polluted farmland flow-out water. In addition, the engineering waste includesindustrial wastes and natural ore slag, so that the cost of the active packing of the PRB device is reduced, and resource reutilization is achieved.

Description

technical field [0001] The invention relates to the field of environmental pollution restoration, in particular to a method for treating pollutants such as nitrogen, phosphorus, and pesticides (tricyclazole, malathion, and rice blastin) in farmland receding water by using engineering waste as a PRB filler. Background technique [0002] Water pollution is one of the hottest environmental issues facing the world, and non-point source pollution has become the main source of pollution in water environments around the world. Farmland non-point source pollution mainly comes from the unreasonable application of chemical fertilizers and pesticides in farming and sewage irrigation, etc., resulting in a large amount of nitrogen, phosphorus and pesticide residues entering rivers, lakes and other water environments with farmland drainage or rainwater. The eutrophication of water caused by nutrients such as nitrogen and phosphorus is not only the most common phenomenon of water pollution...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F101/10C02F101/16
CPCC02F1/28C02F2101/105C02F2101/163
Inventor 陈希娟庄杰仝冬丽石亚楠
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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