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A method for synchronously removing nitrate and arsenic from groundwater by using natural pyrrhotite and its application

A pyrrhotite and groundwater technology, applied in chemical instruments and methods, polluted groundwater/leachate treatment, water/sewage treatment, etc. The problem is to achieve the effect of good bacterial liquid separation effect, wide growth temperature and easy engineering application.

Active Publication Date: 2019-08-06
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the problems that the existing groundwater treatment method of nitrate and arsenic compound pollution has high cost of step-by-step treatment, complicated process, and unsatisfactory treatment effect, one of the purposes of the present invention is to provide a method for synchronously removing groundwater by using natural pyrrhotite Nitrate and arsenic method, sulfur autotrophic denitrifying bacteria use natural pyrrhotite as a sulfur source to denitrify and remove nitrate in water; the biological oxidation product of pyrrhotite Fe 2+ , Fe 3+ Capable of removing arsenic from water by precipitation

Method used

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  • A method for synchronously removing nitrate and arsenic from groundwater by using natural pyrrhotite and its application
  • A method for synchronously removing nitrate and arsenic from groundwater by using natural pyrrhotite and its application
  • A method for synchronously removing nitrate and arsenic from groundwater by using natural pyrrhotite and its application

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Embodiment 1

[0039] A method for synchronously removing nitrate and arsenic in groundwater by using natural pyrrhotite, the treatment object is artificial water prepared from tap water, potassium nitrate, and potassium dihydrogen phosphate, and the steps are:

[0040] (a) Material preparation: crush the natural pyrrhotite from Tongling, Anhui Province with iron-sulfur content of 58% and 39% respectively to 80-100 meshes, pickle and rinse with distilled water until the pH value of the effluent is 6-8 between, and then dried in a vacuum oven at 30°C for later use;

[0041] (b) Strain screening: use the screening medium to screen sulfur autotrophic denitrifying bacteria from the UASB process anaerobic sludge of Nanjing Yangzi Petrochemical Sewage Plant as the target strain; the main components and concentrations of the screening medium are NaS 2 o 3 ·5H 2 O 5g / L, KNO 3 2g / L, KH 2 PO 4 2g / L, NaHCO 3 1g / L, MgCl 2 ·6H 2 O 0.5g / L, NH 4 Cl 0.5g / L, FeSO 4 ·7H 2 O0.01g / L.

[0042](c) ...

Embodiment 2

[0046] A method for synchronously removing nitrate and arsenic in groundwater by using natural pyrrhotite, the treatment object is artificial water prepared from tap water, potassium nitrate, and potassium dihydrogen phosphate, and the steps are:

[0047] (a) Material preparation: the natural pyrrhotite with 58% and 39% iron-sulfur content from Tongling, Anhui Province was crushed to 5-20 meshes, pickled and then rinsed with distilled water until the pH was between 6-8, Dry in a vacuum oven at 30°C for subsequent use;

[0048] (b) Strain screening: use the screening medium to screen sulfur autotrophic denitrifying bacteria from the UASB process anaerobic sludge of Nanjing Yangzi Petrochemical Sewage Plant as the target strain; the main components and concentrations of the screening medium are NaS 2 o 3 ·5H 2 O 5g / L, KNO 3 2g / L, KH 2 PO 4 2g / L, NaHCO 3 1g / L, MgCl 2 ·6H 2 O 0.5g / L, NH 4 Cl 0.5g / L, FeSO 4 ·7H 2 O0.01g / L.

[0049] (c) Sewage treatment: Take the dist...

Embodiment 3

[0052] A method for synchronously removing nitrate and arsenic in groundwater by using natural pyrrhotite, the object of treatment is artificial water prepared from tap water, potassium nitrate, and potassium dihydrogen phosphate, and the steps are:

[0053] (a) Material preparation: the natural pyrrhotite with 58% and 39% iron-sulfur content produced in Tongling, Anhui Province was crushed to 100-150 meshes, pickled and then rinsed with distilled water until the pH was between 6-8, Dry in a vacuum oven at 30°C for subsequent use;

[0054] (b) Bacterial strain screening: use the main screening medium to screen sulfur autotrophic denitrifying bacteria from the UASB process anaerobic sludge of Nanjing Yangzi Petrochemical Wastewater Plant as the target strain;

[0055] (c) Sewage treatment: take nitrate nitrogen and arsenic with initial concentrations of 21.1mg / L and 27.3mg / L respectively, inoculate 9% (v / v) of the target bacteria in the reactor, and then add concentration 220g...

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Abstract

The invention discloses a method for synchronously removing nitrate and arsenic in underground water by natural pyrrhotite and an application of the method, and belongs to the technical field of water resource purification. The method includes the steps: (a) material preparation: crushing the natural pyrrhotite into particles and washing the particles into neutral with water after acid pickling; (b) strain screening: screening sulfur-based autotrophic denitrification bacteria taking the natural pyrrhotite as a sulfur source from anaerobic sludge by a specific screening medium to serve as a target strain; (c) sewage treatment: taking the underground water containing the nitrate and the arsenic, inoculating the target strain and then placing the underground water in a reactor containing the natural pyrrhotite for reaction; (d) solid-liquid separation. The natural pyrrhotite is used as the sulfur source of the sulfur-based autotrophic denitrification bacteria for denitrification, the nitrate in the water is transformed into nitrogen in a reductive manner, the pyrrhotite and oxidation product thereof can remove the arsenic in the water by the aid of functions such as chemical precipitation and adsorption, so that the nitrate and the arsenic in the underground water are synchronously and efficiently removed. The method is convenient in operation and low in cost.

Description

technical field [0001] The invention belongs to the technical field of water resource purification, and more specifically relates to a method for synchronously removing nitrate and arsenic in groundwater by using natural pyrrhotite and its application. Background technique [0002] A large amount of nitrogen fertilizer application in agriculture and special geological factors will cause large-scale compound pollution of nitrate and arsenic in groundwater, which poses a huge threat to the drinking water safety of local residents. The combined pollution of nitrate and arsenic in groundwater is particularly serious in my country. According to relevant literature reports, nitrate and arsenic pollution are common in groundwater in cities such as Tianjin, Harbin, Xi'an, and Changchun. At present, the removal of nitrate and arsenic in water is carried out separately. There is no mature method for removing nitrate and arsenic at the same time. Treating the two pollutants separately ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F103/06
CPCC02F1/281C02F1/5236C02F3/28C02F2001/007C02F2103/06
Inventor 李睿华刘卓沈建华肖才林施鹏戴建军李爱民仓基俊
Owner NANJING UNIV
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