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

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 excessive heavy metals and nitrate pollutants.

Active Publication Date: 2021-04-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • 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

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

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Embodiment 1

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

[0078] Step 1, sludge enrichment and domestication:

[0079] Take 10L of mine wastewater to be treated and FJY culture solution according to the volume ratio of 3:1, mix them evenly, place them in a constant temperature incubator (25-30°C) for enrichment culture, and inject 7L / min nitrogen gas into the reactor 4 times a day , 5 minutes each time, during the enrichment culture process, 7 days is a culture cycle, replace half of the supernatant with FJY culture medium, using a shaker with a rotation 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%, it ind...

Embodiment 2

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

[0106] Step 1, sludge enrichment and domestication:

[0107] Take 10L of mine wastewater to be treated and FJY culture solution according to the volume ratio of 4:1, mix them evenly, place them in a constant temperature incubator (25-30°C) for enrichment culture, and inject 5L / min nitrogen into the reactor 4 times a day , 5 minutes each time, during the enrichment culture process, 7 days is a culture cycle, replace half of the supernatant with FJY culture medium, using a shaker with a rotation 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 60%, it indic...

Embodiment 3

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

[0132] Step 1, sludge enrichment and domestication:

[0133] Take 10L of mine wastewater to be treated and FJY culture solution according to the volume ratio of 2:1, mix them evenly, place them in a constant temperature incubator (25-30°C) for enrichment culture, and inject 8L / min nitrogen gas into the reactor 4 times a day , 5 minutes each time, 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 rotation speed of 120r / min, and 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%, it...

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Abstract

The invention discloses a method for synchronously removing heavy metals and nitrates in mine wastewater and a reactor. The method comprises the following steps: sludge enrichment and domestication, preparation of a biological agent, preparation of a double-layer iron-carbon filler, biofilm formation and operation of the reactor. The reactor comprises a double-layer iron-carbon filler, a gas washing plate, a guide plate, a supporting layer, an outlet aeration system and a filter plate from top to bottom, a backwash valve is arranged at the bottom of the reactor, a backwash water tank controls the flow through a backwash flowmeter, and a water inlet pump pumps water to cooperate with a gas washing plate to realize backwash; two exhaust holes are formed in the top of the reactor; and water is discharged from the water outlet and then enters a sedimentation tank for sedimentation and drainage. A double-layer iron-carbon filler is adopted, nitrate is removed under the effect of microorganisms, microorganism precipitates (FeOOH, Fe2O3 and Fe (OH) 3) are generated to adsorb and remove Cd < 2 + >, Pb < 2 + > and Ni < 2 + >, and the method has the advantages of being free of secondary pollution, high in biological activity, low in cost, easy to operate and manage and the like.

Description

technical field [0001] The invention relates to the technical field of heavy metal and nitrate treatment in mine wastewater, in particular to a method and a reactor for synchronously removing nitrate and heavy metal 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 metals 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, direct discharge of sewage containing excessive nitrates and heavy metals will cause various chronic diseases, cancer, and soil pollution. and deteriorating groundwater conditions. Therefore, for the treatment of mine wastewater containin...

Claims

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Application Information

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Patent Type & Authority Applications(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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