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Method for treating formaldehyde wastewater by using aerobic granular sludge

A technology of aerobic granular sludge and anaerobic granular sludge, applied in water/sludge/sewage treatment, biological water/sewage treatment, water treatment parameter control, etc., can solve loss, sludge bulking, total nitrogen removal Low efficiency and other problems, to achieve the effect of stable performance, cost saving, simple operation

Pending Publication Date: 2022-02-11
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of sludge bulking, loss, inhibition of ammonia nitrogen oxidation, and low removal rate of total nitrogen in the treatment of formaldehyde wastewater by using activated sludge, the present invention provides a method for treating formaldehyde wastewater by using aerobic granular sludge in combination with the above background technology method

Method used

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  • Method for treating formaldehyde wastewater by using aerobic granular sludge
  • Method for treating formaldehyde wastewater by using aerobic granular sludge
  • Method for treating formaldehyde wastewater by using aerobic granular sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the cultivation of aerobic granular sludge

[0026] Specific steps are as follows:

[0027] Using simulated wastewater, inoculate anaerobic granular sludge in the adaptive reactor and run it. The running time of each cycle is 24 hours, of which water inflow is 5 minutes, sedimentation is 5-1 minutes, drainage is 5 minutes, idle time is 1 minute, and the rest of the time is aeration time. , the aeration rate is 0.25L / min, and the volume exchange ratio is 50%. The composition of the simulated wastewater is: sodium acetate 641.03mg / L, ammonium chloride 95.5mg / L, potassium dihydrogen phosphate 21.9mg / L and trace elements 1mL / L, the composition of trace elements is CaCl 2 :75mg / L, FeCl 3 .3H 2 O:8mg / L, MgSO 4 .7H 2 O:23mg / L, MnCl 2 .4H 2 O:65mg / L, ZnSO 4 .7H 2 O:26mg / L, CuSO 4 .5H 2 O: 12mg / L, EDTA: 65mg / L. The reaction control conditions are as follows: the pH value is 7, the dissolved oxygen content is 2-8mg / L, and the water temperature is 28±2°C....

Embodiment 2

[0029] Embodiment 2: the cultivation of aerobic granular sludge

[0030] Specific steps are as follows:

[0031] Using simulated wastewater, inoculate anaerobic granular sludge in the adaptive reactor and run it. The running time of each cycle is 24 hours, of which water inflow is 5 minutes, sedimentation is 5-1 minutes, drainage is 5 minutes, idle time is 1 minute, and the rest of the time is aeration time. , the aeration rate is 1L / min, and the volume exchange ratio is 50%. The composition of the simulated wastewater is: sodium acetate 641.03mg / L, ammonium chloride 95.5mg / L, potassium dihydrogen phosphate 21.9mg / L and trace elements 1mL / L, the composition of trace elements is CaCl 2 :75mg / L, FeCl 3 .3H 2 O:8mg / L, MgSO 4 .7H 2 O:23mg / L, MnCl 2 .4H 2 O:65mg / L, ZnSO 4 .7H 2 O:26mg / L, CuSO 4 .5H2 O: 12mg / L, EDTA: 65mg / L. The reaction control conditions are as follows: the pH value is 7, the dissolved oxygen content is 2-8mg / L, and the water temperature is 28±2°C.

[...

Embodiment 3

[0033] Embodiment 3: utilize aerobic granular sludge to process formaldehyde waste water

[0034] Adopt sequencing batch reactor, take the aerobic granular sludge cultivated among the embodiment 1 as inoculation sludge, formaldehyde waste water is processed, and constantly improve the concentration of influent formaldehyde, by 50mg / L every 10 days (to be reacted After the device is running stably) gradually increase the formaldehyde concentration by 50mg / L until the influent formaldehyde concentration is 150mg / L. Formaldehyde wastewater composition includes: formaldehyde 50-150mg / L, ammonium chloride 95.5mg / L, potassium dihydrogen phosphate 21.9mg / L and trace element 1mL / L, and trace element is consistent with embodiment 1; The running time of each cycle is 24 hours, including water inflow for 5 minutes, sedimentation for 5-1 minutes, drainage for 5 minutes, and idleness for 1 minute; the aeration rate is 0.25L / min, and the volume exchange ratio is 50%.

[0035] See Table 1 f...

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Abstract

The invention discloses a method for treating formaldehyde wastewater by using aerobic granular sludge. According to the method, mature aerobic granular sludge is cultured and used for treating the formaldehyde wastewater, synchronous removal of organic matter such as formaldehyde and total nitrogen is achieved, and the removal rates of formaldehyde, COD and total nitrogen can reach 98.2%, 90.5% and 95.1% respectively. According to the method, the aerobic granular sludge is used for treating the formaldehyde wastewater for the first time, the performance of the reactor is stable, during operation, the granular sludge is not impacted by formaldehyde toxicity, undesirable characters such as sludge bulking and loss do not occur, and compared with other biological methods for treating the formaldehyde wastewater, the method has the advantages of cost saving, simple operation and the like.

Description

technical field [0001] The invention belongs to the technical field of waste water biological treatment, and in particular relates to a method for treating formaldehyde waste water with aerobic granular sludge. Background technique [0002] Formaldehyde is a common chemical used in many products. With the rapid development of the economy, our country produces more and more formaldehyde, and basically all provinces produce formaldehyde. Formaldehyde wastewater has a wide range of sources, among which the main industries are tanning industry, chemical industry, textile industry and so on. [0003] Formaldehyde is more harmful to organisms. Studies have found that women who have been exposed to formaldehyde for a long time are prone to menstrual disorders or excessive phenomena, and pregnant women are prone to miscarriage or the possibility of giving birth to deformed babies in an environment containing formaldehyde for a long time ; Organisms in an environment containing low...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F101/34
CPCC02F3/1263C02F2101/34C02F2209/005C02F2209/38Y02W10/10
Inventor 李海松郑焕焕许子聪田敏慧王丹丹范艳艳王振松
Owner ZHENGZHOU UNIV