Short-cut nitrification granular sludge applied to high-salt and high-ammonia-nitrogen wastewater treatment and culture method
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A technology of short-range nitrification and cultivation method, which is applied in the field of short-range nitrification granular sludge, to achieve the effect of shortening the start-up time, shortening the time, and enriching the population structure
Pending Publication Date: 2022-07-29
BEIJING NORMAL UNIVERSITY
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[0004] The present invention provides a short-range nitrification granular sludge and a cultivation method applied to the treatment of high-salt, high-ammonia-nitrogen wastewater, aiming at the problems of the existing biological denitrification process, and realizing stable and efficient short-range nitrification of high-salt, high-ammonia-nitrogen wastewater
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Embodiment 1
[0039] Example 1. Treatment of landfill leachate with short-range nitrification granular sludge
[0040] The short-path nitrification granular sludge was used to treat the landfill leachate, and the reactor was operated at room temperature to investigate the rate of ammonia oxidation in the reactor, the stability of the short-path nitrification and the nitrite accumulation rate of the nitrite granular sludge reactor.
[0041] In this example, the concentration of inoculated granular sludge in the reactor was 4.2 g MLSS / L.
[0042] The granular sludge reactor was operated in a sequence batch mode with a volume exchange ratio of 50%, and each cycle included 5 min of water inflow, 6h of aeration, 5min of sedimentation and 5min of effluent.
[0043] Table 2 Water quality of landfill leachate
[0044]
[0045] The domestication is achieved by properly diluting the wastewater, which are 4 times dilution (stage I, 1~13d), 3 times dilution (stage II, 14~23d) and 2 times dilution (...
Embodiment 2
[0048] Example 2. Treatment of flue gas desulfurization wastewater by using short-range nitrification granular activated sludge
[0049] The flue gas desulfurization wastewater was treated with the short-path nitrification granular activated sludge cultivated in Example 1, and the reactor was inoculated with a granular sludge concentration of 4 g MLSS / L.
[0050] The reactor was run in batch experiment to investigate the short-range nitrification effect of short-range nitrification granular activated sludge in the treatment of desulfurization wastewater.
[0051] Table 3 Desulfurization wastewater quality
[0052]
[0053] Air is supplied by sintering aeration stones at high temperature, and pH is controlled at 7-8 by adding sodium bicarbonate.
[0054] like Figure 7 After a brief adaptation of the sludge shown, the complete degradation of ammonia nitrogen was achieved at 36h. The effluent nitrite was 1008.71±0.46mg / L, nitrate was 17.12±2.11mg / L, the nitrite accumulation...
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Abstract
The invention belongs to the field of sewage treatment, and particularly relates to granular activated sludge for efficiently realizing short-cut nitrification of high-salt and high-ammonia-nitrogen wastewater, which is characterized in that common activated sludge of a municipal sewage treatment plant is used as seed sludge, culture is performed in a sequencing batch manner, and the short-cut nitrification of high-salt and high-ammonia-nitrogen wastewater is realized by adjusting matrix concentration and settling time. The granular activated sludge for efficiently realizing short-cut nitrification of the high-salt and high-ammonia-nitrogen wastewater is obtained. The cultured sludge can quickly start a short-cut nitrification process for high-salt and high-ammonia-nitrogen wastewater and stably operate for a long time, due to the characteristics of high biomass and good settling performance of the granular sludge, the volume of a reactor can be reduced, the efficiency of a biological process can be improved, meanwhile, the residual sludge is less, and the sludge treatment cost is reduced. Aeration required by short-range nitrification is lower than that required by traditional whole-range nitrification, the subsequent combined denitrification process and anaerobic ammonia oxidation process can greatly reduce the carbon source dosage, and the operation cost is reduced. According to the invention, the maximum nitrite accumulation rate and ammoxidation rate can reach 98% and 1.162-1.164 kgN * m <-3 > * d <-1 >.
Description
technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a short-range nitrification granular sludge applied to the treatment of high-salt and high-ammonia-nitrogen wastewater Background technique [0002] Ammonia nitrogen is a major pollutant in wastewater, mainly in the form of ammonium ions and free ammonia. Ammonia nitrogen is an important substance that causes eutrophication of water bodies and environmental pollution, which is harmful to human health, and can easily lead to the proliferation of algae and other microorganisms in the water, the death of a large number of fish, and even the drying and death of lakes. On the other hand, ammonia nitrogen will also increase the amount of chlorine used in the process of water supply disinfection and industrial circulating water sterilization treatment; it is corrosive to some metals (copper); when sewage is reused, ammonia nitrogen in reclaimed water can ...
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