Method for rapidly starting A2/O system by utilizing dredged sediment and judgment method for successful starting
A technology of dredging sediment and quick start, which is applied in the field of environmental engineering, can solve the problems of cumbersome detection methods, time-consuming, lagging response, etc., and achieve the effect of simple detection, less time-consuming and low cost
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Embodiment 1
[0032] Using Dredged Sediment as Reactor Startup Sludge Quick Start A 2 / O system, A 2 The process flow chart of the / O system is as follows: figure 1 As shown, the specific startup steps are as follows:
[0033] 1) Take the dredged sediment for stuffy exposure treatment, and the dissolved oxygen in the stuffy exposure is controlled at 2-5mg / L. After the first 4-8 hours of stuffy exposure, stop the aeration and let it stand to remove the upper layer of floating mud. Expose again for 1-2 days, and pump nutrient solution into it, the COD concentration in the nutrient solution is 300-600mg / L, NH 3 -N concentration is 25-40mg / L, TP concentration is 2-5mg / L. After standing still, the upper layer of floating mud mixture is removed again, and the rest is used as the bottom mud for reactor startup;
[0034] 2) Add the bottom mud after stuffy exposure to A 2 In the O+MBR reactor, the dosage in the anaerobic pool 7, the anoxic pool 8 and the aerobic pool 9 all account for 50-75% o...
Embodiment 2
[0038] S1. Sampling: Since starting the reactor, take the sludge water in the aerobic tank 2-3 times a day, 50-100ml each time, depending on the condition of the aeration tank mixture to be tested, dilute n times with distilled water to The protozoa and metazoa of the grid can be counted as degrees, where n is greater than or equal to 1;
[0039] S2. Plate making: Calibrate the volume of each drop of water in the burette to 0.05mL, take a clean counting plate, cover the counting area with a cover glass, and run along the bottom of the cover glass from the grooves on both sides of the middle platform of the counting plate. Add a drop of diluted mixed solution to the edge, let the mixed solution fill the counting area with the surface tension of the liquid;
[0040] S3. Counting: Use a microscope to find the counting area under a low-power lens, and then switch to a medium-power lens (16*10) to observe and record the types of protozoa including sessile ciliates and metazoans inc...
Embodiment 3
[0048] In addition to microbial microscopic examination, routine sludge performance (SV30, MLSS, SVI, MLVSS) and pollutant indicators (COD, NH 3 -N, TN, TP) detection. See Table 2 and Table 3 for the removal effect of each index and the performance change of sludge within 10 days.
[0049] Table 2 Pollutant removal effect
[0050]
[0051]
[0052] Table 3 Changes in sludge performance
[0053]
[0054] It can be seen from the comparison of the removal rates of COD and ammonia nitrogen in the aeration tank at different start-up times in Table 1 and Table 2 that when there are more activated sludge, the activated sludge has good performance, good treatment effect, and good effluent quality. COD of the system at this time, NH 3 -N, TN, and TP have good removal effects, and the removal rates are 95.81%, 97.26%, 85.19%, and 77.81%, respectively. The appearance of rotifers in the activated sludge during the cultivation period indicates that the sludge is basically matu...
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