Investigation of hydrodynamic parameters in a draft tube reactor using radioisotope based techniques and conventional method

2015 ◽  
Vol 101 ◽  
pp. 93-100 ◽  
Author(s):  
S.H. Jung ◽  
J.G. Park ◽  
J.H. Moon ◽  
J.B. Kim
Keyword(s):  
Conventional Method ◽  
Draft Tube ◽  
Hydrodynamic Parameters ◽  
Tube Reactor

Effect of liquid circulation in the draft-tube reactor on precipitation of calcium carbonate via carbonation

2009 ◽  
Vol 190 (3) ◽  
pp. 319-323 ◽  
Author(s):  
Donata Konopacka-Łyskawa ◽  
Zbigniew Cisiak ◽  
Bożenna Kawalec-Pietrenko
Keyword(s):  
Calcium Carbonate ◽  
Draft Tube ◽  
Liquid Circulation ◽  
Tube Reactor

Removal and recovery of phosphate and ammonium as struvite from supernatant in anaerobic digestion

2003 ◽  
Vol 48 (1) ◽  
pp. 171-178 ◽  
Author(s):  
M. Yoshino ◽  
M. Yao ◽  
H. Tsuno ◽  
I. Somiya
Keyword(s):  
Draft Tube ◽  
Molar Ratio ◽  
Design Parameters ◽  
Phosphorus Concentration ◽  
Tube Reactor ◽  
Basic Reaction ◽  
Efficiency Estimation ◽  
Tube Type ◽  
Near Future ◽  
Removal And Recovery

Removal of phosphorus and nitrogen is required to prevent eutrophication problems in lakes and enclosed coastal seas. And recovery of phosphorus from wastewater has been attracting attention because of lack in phosphorus resources in the near future. In this study, reaction kinetics and design parameters of struvite production are experimentally investigated by using basic reaction type and a draft-tube type reactors. Struvite production rate, which is a very important parameter in reactor design and efficiency estimation, is formulated in an equation consisting of a rate constant (k2), and magnesium, phosphate and ammonium concentrations. The value of k2 is shown to be increased with struvite concentration and mixing intensity in the reactor. The developed equation is applied to the results obtained from the draft-tube type reactor experiments and verified for its applicability. High struvite concentration of 10-25% is maintained in the draft-tube reactor experiments. 92% removal and recovery efficiency with effluent phosphorus concentration of 17 mg/L is achieved under the conditions of 4 minutes reaction time, pH of 8.5 and Mg/P molar ratio of 1.1.

THE EFFECT OF APPLYING SQ3R METHOD ON STUDENTS’ ACHIEVEMENT IN READING COMPREHENSION

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
Pranata Royganda Sihaloho And Masitowarni Siregar
Keyword(s):  
Reading Comprehension ◽  
Research Design ◽  
Conventional Method ◽  
Experimental Research ◽  
T Test ◽  
Control Group ◽  
Multiple Choice Tests ◽  
Choice Tests ◽  
And Control ◽  
Experimental Group

The aim of this study is to discover the effect of applying SQ3R method inreading comprehension. Experimental research design is used as the research method.This research took place at SMA Nasrani 2Medan. There were 2 classes chosen as thesample with 30 students in each class. The classes were divided into two groups namelyexperimental and control group. The experimental group was taught by using SQ3Rmethod and the control group was taught by using conventional method. The instrumentused to collect the data was a set of multiple choice tests, which divided as pre test andpost test. The result of the research was analyzed by using t-test formula. The resultshowed that t-test was higher than t-table (4,23>2,00) at the level of significant 0,05with degree of freedom (df) 58. It means that hypothesis alternative (Ha) is acceptedwhich shows that SQ3R method significantly improves the student’s readingcomprehension.

Sign in / Sign up

Export Citation Format

Share Document