Sewage and sludge treatment method for achieving good biological phosphorus removal and improving acid production of sludge
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A biological phosphorus removal and sludge treatment technology, applied in biological sludge treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as increasing operating costs, reduce operating costs, reduce exposure Gas volume, the effect of reducing the volume
Active Publication Date: 2012-11-14
TONGJI UNIV
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Problems solved by technology
Due to the low content of short-chain fatty acids in sewage in my country (especially in sewage in southern regions), methods such as adding acetic acid are often used to ensure the efficiency and stability of nitrogen and phosphorus removal in treatment facilities, which greatly increases operating costs.
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Embodiment 1
[0027] Such as figure 1 As shown, the sewage treatment plant is a common sequencing batch reactor, such as figure 2 As shown, the residual sludge acid production device used is an alkaline fermentation tank, and its operation method is carried out according to the following steps:
[0028] 1. Open the water inlet valve 2, and the sewage enters the main body 7 of the sequencing batch reactor from the water inlet pipe 1. After the water inlet is completed, close the water inlet valve 2.
[0029] 2. After the water intake is completed, turn on the air compressor 11 for aerobic aeration, and the aerobic aeration time is 4 hours.
[0030] 3. During aerobic aeration for 1 hour, open the sludge discharge valve 5 to discharge a certain amount of mud-water mixture, so that the concentration of activated sludge in the reactor is 3000 mg·L -1 Around, the sludge sludge age is about 12d. After the discharged mud-water mixture settles for 0.5 hours, the supernatant is returned to the ma...
Embodiment 2
[0042] According to the operating method of Example 1, the operating effect of the anaerobic / aerobic process for treating urban domestic sewage and the comparison of the acid production of the obtained residual sludge. Influent COD is 320~350 mg·L -1 , TN is 30~32mg·L -1 , TP is 9~10 mg·L -1 .
[0043] The comparison of sewage treatment results after stable operation is as follows: the effluent COD of the above operation method is 24~32mg·L -1, ammonia nitrogen is 0~3.2mg·L -1 , TP is 0~0.88mg·L -1 ; Anaerobic / aerobic process effluent COD is 22~30mg·L -1 , ammonia nitrogen is 0.26~5.68mg·L -1 , TP is 0~0.79mg·L -1 .
[0044] The remaining sludge obtained was anaerobically fermented in a reactor with a working volume of 600 mL. The fermentation time is exactly the same as the control condition: pH=10±0.1, fermentation time is 4 days, and fermentation temperature is 20±1°C. The results of the obtained organic acids are as follows: the acid production result of the slud...
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Abstract
The invention relates to a sewage and sludge treatment method for achieving good biological phosphorus removal and improving acid production of the sludge. An ordinary sequencing batch reactor is adopted to treat the sewage, and an alkaline fermentation pool is utilized to ferment excess sludge generated in the sewage treatment process. The sewage and sludge treatment method particularly comprises enabling the sewage to enter the sequencing batch reactor, and directly performing aerobic aeration on the sewage; discharging a certain amount of mud water mixture, controlling sludge age, enabling supernatant to return to the sequencing batch reactor after the mud water mixture subsides, performing aerobic aeration and subsiding on the excess sludge, and draining water; enabling the excess sludge generated in the sequencing batch reactor to enter the alkaline fermentation pool after water draining is finished; starting an agitator, starting an automatic alkali-adding device, and enabling pH in the alkaline fermentation pool to be 10+ / -0.1; and performing mud water separation after 4-day fermentation. According to the sewage and sludge treatment method, physicochemical properties of the excess sludge is controlled from a source of sewage treatment, yield of organic acid in the alkaline fermentation process of the excess sludge is improved, fermentation time is shortened, an organic matter part in the sewage is removed by microorganism accumulation simultaneously, the aeration amount is reduced, and sewage treatment running cost is reduced.
Description
technical field [0001] The invention relates to a sewage and sludge treatment method for realizing good biological phosphorus removal and increasing sludge acid production, and belongs to the technical field of environmental protection. Background technique [0002] Municipal sludge is a solid or semi-solid sediment produced in the process of sewage treatment by sewage treatment plants. It has the characteristics of large output, high organic content and complex composition. If it is not handled properly, it will easily cause secondary pollution. Anaerobic digestion of sludge to produce short-chain fatty acids is an important direction of sludge resource utilization, which has attracted the attention of many researchers this year. [0003] Short-chain fatty acids (including acetic acid, propionic acid, etc.) are preferred carbon sources for nitrogen and phosphorus removal in the process of sewage biological treatment, and their content directly determines the concentration ...
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