1. Downflow chamber and surface layer were main purification space of pollutants.

2. The pulse flow is induced in a downflow boiling point reactor by vaporization of a portion of the liquid feed at proper conditions.

3. The downflow and horseshoe vortex is guided to the downstream successfully far away from the bridge pier structure.

4. After the cracking reaction in downflow reactor, reaction products are separated and spent catalyst is directed to stripping and regeneration sections.

5. The water quality evolvement process in Yangtze River drainage area is believed as a complex network system, with having lots of nodes and correlating to the downflow.

6. The standard unit is constructed of tubular steel with a painted finish and solid clear vinyl curtain that allows a continuous downflow purge of Unidirectional Flow airflow.

7. The characteristics of boiling heat transfer of steam - water two - phase downflow and up-flow in vertical tube are theoretically and experimentally studies in this paper.

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8. Methods Porous ceramics were used as immobilization carrier. Optimum conditions for nitrate-nitrogen removal of downflow fixed-bed bioreactor were studied.

9. This paper describes an experimental and theoretical research on the two-phase flow pattern transition of downflow in vertical helical coils in an air-water loop.

10. The Lo-Pro PDE provides a Class 100 Unidirectional Flow portable downflow environment, pre-designed for product isolation and spot coverage over process equipment.

11. Objective To study the community of denitrifying bacteria and nitrate - nitrogen removal in downflow fixed - bed bioreactor.

12. The sequence of importance, the prominent factors affecting performance of the distributor, and the optimum structure of downflow wastewater distributors are obtained.