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A device and method for treating ammonia nitrogen wastewater

A technology for ammonia nitrogen wastewater and raw water, applied in the direction of microorganism-based methods, biomass post-treatment, chemical instruments and methods, etc., can solve the problems of affecting the internal structure of the pellets, decreasing the strength of the pellets, and long processing time, etc., so as to reduce the operation Effects of difficulty, reduced operation, and fast removal rate

Active Publication Date: 2020-11-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the concentration of ammonia nitrogen that can be treated by this patent is low, only 20ppm; although it can completely remove ammonia nitrogen in sewage, the treatment time is longer (6 days)
In addition, the gel beads formed by sodium alginate and calcium chloride contain other metal ions (such as Mg 2+ ) in sewage, Ca 2+ It will be gradually replaced by other ions (about 2 days), causing the strength of the pellet to decrease, and then rupture
The microalgae cells in the pellet will also continue to divide and grow, affecting the internal structure of the pellet, making it impossible to reuse for a long time

Method used

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  • A device and method for treating ammonia nitrogen wastewater
  • A device and method for treating ammonia nitrogen wastewater
  • A device and method for treating ammonia nitrogen wastewater

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[0072] 1. Materials

[0073] Microalgae strains and culture conditions: select a single colony of Chlorella vulgaris growing on the surface of the agar dish 23, and transfer the microalgae colony to the culture solution prepared in advance and sterilized by a high-pressure steam sterilizer.

[0074] The culture medium is 3N-BBM+V culture medium, in which 0.2g / L glucose is added, and the formula of 3N-BBM+V culture medium is as follows (concentrations are all g / L): NaNO 3 ,0.75; CaCl 2 2H 2 O,0.025; MgSO 4 ·7H 2 O,0.075;K 2 HPO 4 ·3H 2 O,0.075; KH 2 PO 4 , 0.175; NaCl, 0.025. In addition, the culture fluid also contains other trace components, including (concentrations are mg / L): Na 2 EDTA, 4.5; FeCl 3 ·6H 2 O,0.582; MnCl 2 4H 2 O,0.246; ZnCl 2 ,0.03; CoCl 2 ·6H 2 O, 0.012; Na 2 MoO 4 2H 2 O,0.024; VB 1 ,1.2; VB 12 ,0.01. The culture volume is 20 mL, and the culture solution is placed in a 25 ml flask 24 .

[0075] The culture solution containing Chlorel...

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Abstract

The invention discloses a device for processing ammonia-nitrogen wastewater and a method thereof. In a membrane contactor, sweep gas is used for bringing out ammonia molecules passing through a hydrophobic microporous hollow fibrous membrane from a raw water side and introducing the ammonia molecules into a microalgae cell solution; and the microalgae cell solution absorbs ammonia in the sweep gas to promote growth of microalgae cells. Ammonia-nitrogen in wastewater is removed and microalgae cell biomass is obtained. The microalgae cells can be repeatedly used for absorbing ammonia-nitrogen in wastewater and also can be used for production of novel green energy after being collected. Existing chemical and biological nitrogen-removal methods are improved, operational difficulty and maintenance cost are reduced, and potential safety hazard is eliminated. By the use of the sweep gas, operation of the device at the wastewater side can be more flexible and convenient and is not restrained. Harmful substances in wastewater can be effectively prevented from inhibiting growth of microalgae and affecting the ammonia-nitrogen removal effect.

Description

technical field [0001] The invention relates to a device and method for treating ammonia nitrogen wastewater, in particular to using a liquid-gas membrane contactor to separate ammonia nitrogen in wastewater, and using a microalgae cell solution to absorb the ammonia carried in the purge gas as a nitrogen source required for its growth . Background technique [0002] The main source of ammonia nitrogen wastewater is the production process of petrochemical, chemical metallurgy, food and pharmaceutical industries and landfill leachate. According to the concentration of ammonia nitrogen, wastewater can be divided into three categories: high concentration (>500ppm), medium concentration (50-500ppm) and low concentration (<50ppm). In general, most industrial wastewater and domestic sewage are low-concentration ammonia-nitrogen wastewater. At present, the more common treatment methods are biological denitrification and physical and chemical methods. However, due to the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C12M1/34C12M1/04C12M1/00C12N1/12C02F101/16C12R1/89
CPCC02F3/322C02F2101/16C12M21/02C12M29/26C12M31/02C12M41/00C12M41/22C12N1/12
Inventor 郭智张新妙栾金义杨永强
Owner CHINA PETROLEUM & CHEM CORP
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