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Reinforced denitrification method for three-dimensional electrode biological film

A three-dimensional electrode and biofilm technology, applied in chemical instruments and methods, water pollutants, anaerobic digestion treatment, etc., can solve the problems affecting the water quality of the system, and achieve the improvement of excessive pH difference and NO2--N Accumulation, effect of strong pH buffering capacity

Inactive Publication Date: 2013-07-10
BEIJING UNIV OF TECH
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Problems solved by technology

At the same time, if the pH is too high or too low, it will also affect the water quality of the system effluent.

Method used

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  • Reinforced denitrification method for three-dimensional electrode biological film
  • Reinforced denitrification method for three-dimensional electrode biological film
  • Reinforced denitrification method for three-dimensional electrode biological film

Examples

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example 1

[0032] Three-dimensional electrode bioenhanced denitrification process and conventional three-dimensional electrode biofilm process were used to treat sewage with a carbon, nitrogen and phosphorus ratio (the mass concentration ratio of COD to nitrogen and phosphorus) of 30:10:1 and a pH of 7.0-7.5. Keep the electrode current at 60mA, the hydraulic retention time at 12h, and the temperature at 15-22°C. Determination of TN and NO in influent and effluent water every day 3 - -N, NO 2 - -N, pH and SO 4 2- . After 19 days of stable operation of the two processes, the average removal rate of TN in the three-dimensional electrode biofilm enhanced denitrification process was 85.55%, and the NO 3 - The average removal rate of N is 98.49%; the average pH value of the effluent water is 8.07, and the average pH difference between the influent and effluent water is 0.64; NO 2 - The average accumulation of -N is 3.90mg / l, and the effluent SO 4 2- The average accumulation amount is...

example 2

[0034] Three-dimensional electrode bioenhanced denitrification process and conventional three-dimensional electrode biofilm process were used to treat sewage with a carbon-nitrogen-phosphorus ratio of 10:10:1 and a pH of 7.0-7.5. Keep the electrode current at 60mA, the hydraulic retention time at 12h, and the temperature at 15-20°C. After 11 days of stable operation of the two processes, the average removal rate of TN in the three-dimensional electrode biofilm process for enhanced autotrophic denitrification was 81.34%, and NO 3 - The average removal rate of -N was 84.23%; the average pH value of the effluent water was 7.64, and the average pH difference between the influent and effluent water was 0.29; NO 2 - The average accumulation of -N is 0.99mg / l, and the effluent SO 4 2- The average accumulation of nitrogen is 128.8mg / L, and the average removal rate of total nitrogen in the conventional three-dimensional electrode biofilm process is 47%. 3 - - The average removal ...

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Abstract

The invention discloses a reinforced denitrification method for a three-dimensional electrode biological film. A three-dimensional electrode biological film process and a sulfur autotrophy process are coupled for denitrification treatment on sewage; and the three-dimensional electrode biological film process is reinforced by increasing the ratio of the autotrophic denitrification. An adopted reactor comprises a cathode, an anode, a direct current power supply, a particle electrode and active plasmids. The reinforced denitrification method is characterized in that activated carbon grains are taken as the particle electrodes, sulfur grains are taken as the active plasmids, and the two are uniformly mixed between the cathode and the anode according to a volume ratio of 5:1 to 10:1. Compared with the conventional three-dimensional electrode biological film process, the reinforced denitrification method greatly improves the removal rate of TN and NO3-N in sewage, effectively improves the situation that the pH values of effluent and inflow water in the three-dimensional electrode biological film process are too large, and has stronger pH value buffering capability; and furthermore the situation that the NO2-N is excessively accumulated in the effluent in the ordinary three-dimensional electrode biological film deep denitrification process is solved.

Description

Technical field: [0001] The invention belongs to the field of sewage treatment and resource utilization, specifically a water treatment process that couples a three-dimensional electrode biofilm process with a sulfur autotrophic denitrification process for sewage denitrification, and is especially suitable for low carbon-to-nitrogen ratios. Nitrogen removal treatment of sewage. Background technique: [0002] The three-dimensional electrode-biofilm technology is a water treatment technology that combines biology and electrochemistry developed on the basis of autotrophic denitrification with hydrogen as the electron donor. Under the condition of a small amount or no organic carbon source, It can realize the removal of nitrogen and some organic matter. The process combines the electrochemical method with the biofilm method. Microbial membranes are formed on the physical electrodes, and direct current is passed between the electrodes for electrolysis. The hydrogen generated by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
Inventor 郝瑞霞孟成成任晓克王建超王润众赵文莉
Owner BEIJING UNIV OF TECH
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