Wastewater treating apparatus

[0069] Example

[0070] As illustrated by specific examples, in figure 1 and figure 2 In the device, the anaerobic tank 4 is used for processing, which can convert organic compounds with a high volume load into organic acids. For example, for the starch manufacturing process series wastewater, the volume load in BOD is 7.8kg/m 3 · At d, when the anaerobic tank 4 is used for 5.3 hours, the BOD value is reduced to 1340mg/L. At this time, the volatile fatty acid (VFA) reached a level of 857mg/L, of which acetic acid was 46.4%, propionic acid was 27.7%, butyric acid was 16.0%, and valeric acid was 9.9%. Therefore, the aerobic treatment in the rear-stage aeration tank 5 is performed very easily and stably.

[0071] So in figure 1 and figure 2 The device can handle organic compounds with a high volume load. As a volume load, for example, the anaerobic tank 4 can reach 5-20 kg/m 3 ·D. Aeration tank 5 is 2~8kg/m 3 ·D. Filter tank 7 is 0.5~1.5kg/m 3 ·D, as in the previous standard activated sludge method, generally about 0.8kg/m 3 ·Compared with the unstable volume load treatment of d, a significant improvement effect can be achieved.

[0072] An example of the water quality measurement of the treated water when the device of the present invention is operated is shown in Table 1. Table 1 shows the water quality of the raw water, the operating conditions of the anaerobic tank 4 and the aeration tank 5, and the treatment with the anaerobic tank 4 and the aeration tank 5. The quality of the water. As shown in Table 1, even when the BOD volume load is high, BOD and COD can be removed efficiently. Therefore, even if omitted figure 1 and figure 2 The illustrated sedimentation tank 6 and filter tank 7 can also be treated to the extent that they can be used as sewage.

[0073] Raw water

[0074] () Indicates the removal rate (%).

[0075] Table 2 shows other measurement examples of the water quality of the treated water when the device of the present invention is operated. Table 2 shows the result of treatment using a high-density contact material in which the number of flocculent filaments 34 per unit length of the core material 33 is larger than usual as the contact material 28 of the aeration tank 5. At this time, as a nitrogen removal rate, a high efficiency of 52.9% can be obtained. It can be judged that this is because the contact material 28 is used as the above-mentioned high-density contact material and the anaerobic layer is formed inside the contact material 28. In addition, such as figure 2 As shown, BOD and COD can also be removed efficiently at this time.

[0076] Raw water

[0077] () Indicates the removal rate (%).

[0078] BOD volume load 1.4(kg/m 3 ·D)

[0079] HRT 8.8(hr)