Method and reactor for synchronously removing heavy metals and nitrates in mine wastewater

A mine wastewater and reactor technology, which is applied in mining wastewater treatment, chemical instruments and methods, and water pollutants, etc., can solve problems such as heavy metals and nitrate pollutants exceeding the standard, and achieve the advantages of being conducive to film hanging, long service life, and active high effect

Active Publication Date: 2022-08-02
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned defects existing in the prior art, the object of the present invention is to provide a method for synchronously removing heavy metals and nitrates from mine wastewater and a reactor used in the method, and to use a novel double-layer iron-carbon filler for bio-filming to realize iron The combination of ion electron gain and loss with denitrification process, nitrate removal and microbial precipitation (FeOOH, Fe 2 o 3 , Fe(OH) 3 ) product realizes the Cd 2+ , Pb 2+ and Ni 2+ Adsorption and removal, to simultaneously solve the problem of heavy metal and nitrate pollutants in mine wastewater exceeding the standard

Method used

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  • Method and reactor for synchronously removing heavy metals and nitrates in mine wastewater
  • Method and reactor for synchronously removing heavy metals and nitrates in mine wastewater
  • Method and reactor for synchronously removing heavy metals and nitrates in mine wastewater

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Embodiment 1

[0077] The mine waste water to be treated in this embodiment comes from the waste water of a certain mining area in Shaanxi Province, and artificially supplements nitrate and heavy metals (Cd2+ , Pb 2+ , Ni 2+ ), follow the technical scheme of the present invention, carry out advanced treatment to the water body, comprising the following steps:

[0078] Step 1, sludge enrichment and domestication:

[0079] Take 10L of the mine waste water to be treated and the FJY culture solution and mix them according to the volume ratio of 3:1, and place them in a constant temperature incubator (25-30°C) for enrichment culture. Pour 7L / min nitrogen gas into the reactor 4 times a day. , every 5 minutes, during the enrichment culture process, 7 days is a culture cycle, replace half of the supernatant with FJY culture medium, use a shaker with a speed of 140r / min, after 3 weeks of enrichment, when the nitrate removal rate Above 70%, Cd 2+ , Pb 2+ , Ni 2+ When the removal rate is above 60%...

Embodiment 2

[0105] The mine waste water to be treated in this embodiment comes from the waste water of a certain mining area in Shaanxi Province, and artificially supplements nitrate and heavy metals (Cd 2+ , Pb 2+ , Ni 2+ ), follow the technical scheme of the present invention, carry out advanced treatment to the water body, comprising the following steps:

[0106] Step 1, sludge enrichment and domestication:

[0107] Take 10L of the mine waste water to be treated and the FJY culture solution and mix them according to the volume ratio of 4:1, and place them in a constant temperature incubator (25-30°C) for enrichment culture. Pour 5L / min nitrogen gas into the reactor 4 times a day. , every 5 minutes, during the enrichment culture process, 7 days is a culture cycle, replace half of the supernatant with FJY culture medium, use a shaker with a speed of 130r / min, after 2 weeks of enrichment, when the nitrate removal rate Above 70%, Cd 2+ , Pb 2+ , Ni 2+ When the removal rate is above 6...

Embodiment 3

[0131] The mine waste water to be treated in this embodiment comes from the waste water of a certain mining area in Shaanxi Province, and artificially supplements nitrate and heavy metals (Cd 2+ , Pb 2+ , Ni 2+ ), follow the technical scheme of the present invention, carry out advanced treatment to the water body, comprising the following steps:

[0132] Step 1, sludge enrichment and domestication:

[0133] Take 10L of the mine waste water to be treated and the FJY culture solution and mix them according to the volume ratio of 2:1, and place them in a constant temperature incubator (25-30°C) for enrichment culture. Pour 8L / min nitrogen into the reactor 4 times a day. , every 5 minutes, during the enrichment culture process, 7 days is a culture cycle, replace half of the supernatant with FJY culture medium, use a shaker with a speed of 120r / min, after 3 weeks of enrichment, when the nitrate removal rate Above 70%, Cd 2+ , Pb 2+ , Ni 2+ When the removal rate is above 60%, ...

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Abstract

The invention discloses a method and a reactor for synchronously removing heavy metals and nitrates in mine wastewater. The steps include: sludge enrichment and domestication, preparation of biological inoculants, preparation of double-layer iron-carbon fillers, biological film formation and reactor operation. The reactor includes top-down double-layer iron-carbon packing, air wash plate, guide plate, support layer, outlet aeration system and filter plate; a backwash valve is set at the bottom of the reactor, and the backwash water tank passes the backwash flow rate. The flow meter is used to control the flow, and the water inlet pump cooperates with the air wash plate to realize backwashing; there are two exhaust holes on the top of the reactor; after the water is discharged from the water outlet, it enters the sedimentation tank for sedimentation and drainage. The double-layer iron-carbon filler used in the present invention removes nitrate under the action of microorganisms, and generates microbial precipitation (FeOOH, Fe 2 O 3 , Fe(OH) 3 ) to achieve the Cd 2+ , Pb 2+ and Ni 2+ It has the characteristics of no secondary pollution, high biological activity, low cost and simple operation and management.

Description

technical field [0001] The invention relates to the technical field of treatment of heavy metals and nitrates in mine wastewater, in particular to a method and a reactor for synchronously removing nitrates and heavy metals in mine wastewater. Background technique [0002] With the continuous development of my country's economy, human activities such as mining, industry and agriculture have released a large amount of heavy metal and nitrate pollutants into the environment. Nowadays, the increasingly serious problem of mine wastewater pollution has attracted much attention. Mine wastewater contains a large amount of toxic heavy metals such as cadmium, lead, and nickel, which are non-biodegradable, persistent and bioaccumulative. At the same time, the direct discharge of sewage containing excessive nitrate and heavy metals can lead to various chronic diseases, cancer and soil pollution. and deteriorating groundwater conditions. Therefore, for the treatment of mine wastewater c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/10C02F101/16C02F101/20C02F103/10
CPCC02F3/107C02F2101/163C02F2101/20C02F2103/10Y02W10/10
Inventor 苏俊峰王悦黄廷林赵廷宝高志宏白一涵孙毅杨玉珠
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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