A device and method for using microalgae to treat ammonia nitrogen wastewater
An ammonia nitrogen wastewater and microalgae technology, applied in enzymology/microbiology devices, biomass post-processing, chemical instruments and methods, etc., can solve the problem of inability to be used repeatedly for a long time, decreased pellet strength, and low ammonia nitrogen concentration and other problems, to improve the removal rate of ammonia nitrogen and the ability of microalgae to treat ammonia nitrogen, and to achieve the effect of repeated use
Active Publication Date: 2020-07-24
CHINA PETROLEUM & CHEM CORP +1
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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 (at least 6 days)
In addition, the gel beads formed by sodium alginate and calcium chloride contain other metal ions (such as Mg 2+ ) in wastewater, Ca 2+ It will be gradually replaced by other metal ions (about 2 days), causing the strength of the ball to decrease and then rupture; at the same time, the microalgae cells in the ball will continue to divide and grow, affecting the internal structure of the microalgae ball, making it impossible to Repeated use over a long period of time
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[0067] 1. Materials
[0068] Microalgae strains and culture conditions: select a single colony of Chlorella vulgaris growing on the surface of the agar dish 21, and transfer the microalgae colony to the culture solution prepared in advance and sterilized by a high-pressure steam sterilizer.
[0069] The culture medium used was 3N-BBM+V culture medium, in which 0.2g / L glucose was added, and the formula of 3N-BBM+V culture medium was as follows (concentration units 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 (concentration units 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. 20 mL of culture broth was placed in a 25 mL flask 22 .
[0070] The culture solution containing Chlorella was cultu...
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Abstract
The invention discloses a device for processing ammonia-nitrogen wastewater by the utilization of microalgae and a method thereof. According to the method, ammonia-nitrogen in wastewater are separated by the use of a membrane contactor; by the negative pressure and suction effect generated after microalgae cell solution flows through a Venturi tube, ammonia molecules passing through a hydrophobic microporous membrane from a raw water side are rapidly brought out, and a nitrogen source which is essential to growth of microalgae is utilized. By the device and the method, ammonia-nitrogen wastewater is processed and purified and microalgae biomass is obtained. The microalgae can be repeatedly used for absorbing ammonia-nitrogen in wastewater and can be used for production of green bio-energy after being collected. According to the invention, existing methods for removing ammonia-nitrogen in wastewater by the utilization of microalgae are improved, operational difficulty is reduced, processing time is shortened, and ammonia-nitrogen removal efficiency is enhanced.
Description
technical field [0001] The invention relates to a device and method for treating ammonia nitrogen wastewater by using microalgae, in particular to a device and method for removing ammonia nitrogen in wastewater by using a membrane contactor, a venturi tube and a microalgae cell solution. Background technique [0002] In recent years, the problem of ammonia nitrogen pollution in water bodies in my country has become increasingly serious. The excessive presence of ammonia nitrogen in water will cause serious harm to organisms and their living environment. To control ammonia nitrogen emissions, it is particularly important to find economical and effective ammonia nitrogen wastewater treatment technologies. According to different concentrations, ammonia nitrogen wastewater can be divided into three categories: high concentration (>500ppm), medium concentration (50-500ppm) and low concentration (<50ppm). Ammonia nitrogen wastewater generally comes from the production proc...
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IPC IPC(8): C02F3/32C12M1/00C12N1/12C02F101/16
CPCC02F3/322C02F2101/16C12M21/02C12N1/12
Inventor 郭智张新妙栾金义章晨林
Owner CHINA PETROLEUM & CHEM CORP