Method for enhancing granulation and sedimentation performance of short-cut nitrification sludge
A technology of sludge granulation and short-range nitrification, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. It can solve the problems of slow effect and the characteristics of short-range nitrification sludge need to be further improved
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Embodiment 1
[0037] The present embodiment provides a method for strengthening the granulation and settling performance of short-range nitrification sludge. The method is as follows: using a sequencing batch activated sludge reactor, inoculating aerobic nitrification sludge in the reactor to contain ammonia nitrogen and inorganic salts. The simulated wastewater with trace elements is influent water, the temperature is maintained at 30-35°C by the heater, and the aeration device maintains the aeration rate at 0.4-0.8L·min -1 , the dissolved oxygen DO in water is 0.2-0.5mg / L, using KHCO 3 and NaOH to maintain the influent pH in the range of 7.8-8.5. Until the ammonia nitrogen in the reaction is completely converted to nitrous, and no nitrate nitrogen is generated, the start-up is completed.
[0038] Then add fulvic acid into the reactor. In order to prevent the negative impact of nitrification sludge on fulvic acid, start adding from a lower concentration, and increase the concentration of ...
Embodiment 2
[0058] The concrete operation of this embodiment is:
[0059] Take 1.5 L of nitrification sludge from the aerobic zone of the biological pool of Weixing City Wastewater Treatment Plant in Liangxiang, Beijing. Transfer the sludge to clean water at 35°C, use an aeration device to aerate the sludge, the aeration rate is 5L / min, the dissolved oxygen in the water is ≥1mg / L, and the aeration time is 24h, then use the 35°C stock solution to aerate the sludge The whole nitrification sludge was cleaned three times, and the sludge was transferred to the sequencing batch activated sludge reactor. The inoculated sludge volume accounted for 15% of the total volume of the reactor, and the initial mixed liquid suspended solids (MLSS) was about 2700mg / L. The sludge particle size is 53.41 μm.
[0060] Artificial simulated wastewater with an ammonia nitrogen concentration of 150mg / L was prepared. Add 1800mg / L of potassium bicarbonate to the wastewater to supplement the alkalinity and serve as...
Embodiment 3
[0065] Under the operating conditions of Example 1, the dissolved oxygen in water was increased from 0.4 mg / L to 0.92 mg / L on the 52nd day when the concentration of fulvic acid was 40 mg / L, which exceeded the limit of 0.8 mg / L in the conventional short-range nitrification operation. L. At this time NO 2 - -N / NH 4 + The -N value is as high as 1.8. In addition to the increase in the accumulation of nitrous, there is still no nitrate nitrogen, and the accumulation of nitrous is further enhanced. The enhancement of sludge particle size and sludge settling performance made the accumulation performance of short-cut nitrification more stable.
[0066] From the data in the above examples, it can be seen that in the field of sewage and wastewater denitrification treatment engineering, the technical solution provided by the present invention has the characteristics of fast increase in sludge particle size, resistance to high oxygen shock and good system stability. Therefore, this m...
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