Method for treating urea in reclaimed water
A technology for regenerating water and urea, applied in the field of ultrapure water treatment, can solve the problems of huge area, hydraulic retention time, poor impact resistance, etc., achieve excellent carbon removal and nitrogen removal performance, good hydrophobicity, and improve treatment efficiency Effect
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specific Embodiment approach
[0046] As a specific embodiment of the present invention, the regenerated water enters from the lower part of the pool and is discharged from the upper overflow port, the carbon-nitrogen ratio is selected to be 5-7, the hydraulic retention time of the membrane aerated biological reaction tank is 2-4h, and the aeration pressure Controlled at 0.02MPa.
[0047] As a specific embodiment of the present invention, the carbon source should be easily decomposable organic matter, and the carbon source is acetic acid, citric acid organic acid, sodium acetate organic acid salt, methyl alcohol, ethanol alcohols and acetone organic solvents. A sort of.
[0048] As a specific embodiment of the present invention, the heat exchanger in S1 includes a housing 1; one end of the housing 1 is provided with a motor 2; the motor 2 is bolted to one end of the housing 1, and the motor The output shaft of 2 extends into the housing 1, and the end of the output shaft of the motor 2 is provided with a r...
Embodiment 1
[0053] Example 1: In a liquid crystal panel factory, the proportion of reclaimed water in raw water is 55%, and the urea content is as high as 4-5ppm from June to August; the implementation of this case includes the following steps:
[0054] The first step: reclaimed water temperature 20 ℃, flow 450m 3 / h, the water temperature is adjusted to 24°C through the heat exchanger, the heat source temperature is 36°C, and the return water temperature is 30°C;
[0055] Step 2: The heated regenerated water enters the membrane aerated biological reaction tank. The water enters from the lower part of the tank and is discharged from the upper overflow port. The carbon-nitrogen ratio is selected as 6.5. The hydraulic retention time of the membrane aerated biological reaction tank is 2 hours, and the aeration pressure is controlled. At 0.02MPa; the added carbon source is sodium acetate, the nitrogen source is ammonium chloride, and the urea content in the effluent is stable at 0.05-0.1ppm; ...
Embodiment 2
[0059] Example 2: In an electronics factory, the proportion of recycled water in raw water is 40%, and the urea content is as high as 3-3.5ppm from June to August. The implementation of this case includes the following steps:
[0060] The first step: reclaimed water temperature 20 ℃, flow 450m 3 / h, the water temperature is adjusted to 24°C through the heat exchanger, the heat source temperature is 36°C, and the return water temperature is 30°C;
[0061] Step 2: The heated regenerated water enters the membrane aerated biological reaction tank. The water enters from the lower part of the tank and is discharged from the upper overflow port. The carbon-nitrogen ratio is selected as 5.6. The hydraulic retention time of the membrane aerated biological reaction tank is 2 hours, and the aeration pressure is controlled. At 0.02MPa; the added carbon source is citric acid, the nitrogen source is ammonium chloride, and the urea content in the effluent is stable at 0.05-0.1ppm;
[0062] ...
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