ZHANGYa-li,HUOKe-ying,ZHOUKun,et al.Determination of Effective Specific Surface Area of Suspended Carrier by Bioassay Method[J].China Water & Wastewater,2022,38(No.3):29-34.
Determination of Effective Specific Surface Area of Suspended Carrier by Bioassay Method
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
No.第3
Page:
29-34
Column:
Date of publication:
2022-02-01
- Keywords:
- moving bed biofilm reactor (MBBR); suspended carrier; effective specific surface area; surface load; bioassay method
- Abstract:
- The determination of effective specific surface area (ESSA) of suspended carrier is very important for accurate design of suspended carrier dosage. A bioassay method was applied to determine ESSA, and the industry-recognized K3 suspended carrier was used as a reference. The suspended carriers to be tested and K3 were placed under the same condition for biofilm attached growth until stability, and ESSA was calculated by comparing the treatment performance of each suspended carrier and the surface load of K3. For 6 different types of suspended carriers in the market, under the condition of low load, the deviation between the labeled ESSA of the products conforming to the industry standard and the measured value was small, while the negative deviation of the non?industry standard products was more than 5.0%. Under the condition of high load, all kinds of suspended carriers had certain deviation. The main reason was that the biofilm thickened and occupied the effective surface area. The bioassay method for determining the ESSA of suspended carriers has the characteristics of accuracy, reliability, strong reproducibility, combining with the actual water quality and so on, which has more engineering practical significance. For conventional municipal sewage treatment, the measurement results under low load have more engineering value. If conditions permit, the actual sewage culture is closer to the engineering results. For high load influent, safety factor should be considered in the design process to prevent the lack of ESSA. The larger the ESSA of the suspended carrier is, the greater load flexibility will be obtained during application, which can provide a microbial basis for sewage treatment plants to continuously increase the discharge standard and the treatment capacity. The development of new suspended carrier should be in the direction of pursuing a larger ESSA, and it is necessary to comprehensively balance the flow channel, fluidization and overall shape of suspended carrier.
Last Update:
2022-02-01