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Immobilized carrier for removing nitrate nitrogen in groundwater with low concentration of iron ions and its preparation method

An immobilized carrier, groundwater technology, applied in the directions of immobilization on/in organic carriers, chemical instruments and methods, contaminated groundwater/leachate treatment, etc., can solve problems such as excessive nitrate pollutants, and achieve management Convenience, low investment cost, and the effect of improving removal efficiency

Active Publication Date: 2020-07-14
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

[0005] Aiming at the problem of insufficient electron donors and low denitrification efficiency in low-concentration iron ion groundwater, the present invention provides an immobilized carrier and preparation method for removing nitrate nitrogen in low-concentration iron ion groundwater, using iron self-circulation technology Remove nitrate nitrogen in groundwater with low concentration of iron ions. When the concentration of iron ions in groundwater is lower than that of nitrate in water (the concentration of iron ions is lower than 5mg / l), it can also effectively solve the problem of excessive nitrate pollutants in groundwater

Method used

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  • Immobilized carrier for removing nitrate nitrogen in groundwater with low concentration of iron ions and its preparation method
  • Immobilized carrier for removing nitrate nitrogen in groundwater with low concentration of iron ions and its preparation method

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Embodiment 1

[0036] The groundwater to be treated in this embodiment comes from a farmer's self-use groundwater in Pucheng County, Shaanxi Province. According to the technical solution of the present invention, the groundwater body is biologically treated, including the following steps:

[0037] Step 1, adding enrichment medium to groundwater for constant temperature anaerobic culture, and collecting sediment;

[0038]Take 10L of groundwater to be treated as the source of bacteria, use the airtight container as the reactor, and use the enrichment medium as the acclimatization medium. ℃). During the enrichment culture process, take 7 days as a culture cycle, replace half of the medium, and use a shaker with a rotation speed of 30-60 to shake 3-4 times a day for 10-15 minutes each time during the enrichment process. Make sure there are nutrients in the reactor for bacterial growth. After 3-5 weeks of enrichment, when the removal rate of nitrate is above 70%, it indicates that the enrichmen...

Embodiment 2

[0045] The groundwater to be treated in this embodiment comes from a certain groundwater well in Chang'an County, Shaanxi Province. According to the technical solution of the present invention, the biological treatment of the groundwater body includes the following steps:

[0046] Step 1, adding enrichment medium to groundwater for constant temperature anaerobic culture, and collecting sediment;

[0047] Take 10L of groundwater to be treated as the bacterial source, the airtight container as the reactor, and the EM1 medium as the acclimatization medium.

[0048] Step 2, adding liquid culture solution to the precipitate for constant temperature cultivation, collecting the bacterial agent precipitate;

[0049] The precipitated material in the enrichment reactor is collected. Add EM2 culture solution to the precipitated substance, replace half of the culture medium at 25°C for 7 days as a culture cycle, and determine that the nitrate removal rate is 81.55%, indicating that the p...

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Abstract

The present invention proposes a method for preparing an immobilized carrier for removal of nitrate nitrogen in groundwater with low concentration of iron ions. The following steps are adopted: step 1, adding enrichment medium to groundwater for constant temperature anaerobic culture, and collecting sediment; step 2, Adding liquid culture solution to the precipitate for constant temperature cultivation, collecting the bacterial agent precipitate; step 3, mixing sodium alginate with a mass volume ratio of 2%-3% and the bacterial agent precipitate at a volume ratio of 1:1, After that, it is injected into a calcium chloride solution with a mass volume ratio of 2%-3% to form an immobilized carrier. Relying on the above method, the present invention also proposes an immobilized carrier prepared according to the above method. Relying on the above prepared immobilized carrier, the present invention also proposes a method for removing nitrate nitrogen from groundwater with low concentration of iron ions. Furthermore, the present invention also proposes a reactor capable of realizing such a removal effect. The present invention realizes high-efficiency biological denitrification when the iron ion in the groundwater is relatively low through self-circulation of iron ions.

Description

technical field [0001] The invention belongs to the technical field of groundwater treatment, and in particular relates to an immobilized carrier for removing nitrate nitrogen in low-concentration iron ion groundwater and a preparation method. Background technique [0002] The increasingly serious problem of groundwater pollution has attracted the attention of many countries around the world. In China, the common pollutants in groundwater are nitrate, iron and manganese ions, etc. In northern areas, especially in rural areas, nitrate pollution is more serious. [0003] Excessive intake of nitrate in groundwater can lead to various chronic diseases or cancer. Nitrate can be converted into nitrite through the human digestive system. Nitrate nitrogen that enters the human body through diet can be reduced in the gastrointestinal tract to form nitrite nitrogen, which can quickly enter the blood to form methemoglobin that cannot carry oxygen, resulting in hypoxia and methemoglob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N11/10C02F3/34C02F103/06C02F101/16
CPCC02F3/34C02F2101/163C02F2103/06C12N11/10
Inventor 苏俊峰张涵黄廷林章园茗薛磊
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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