Adsorption in Jar-Test system: a study of the physico-chemical interactions of the chitosan biopolymer with the textile dye DO 2GL

Abstract In this study, wastewater taken from the Nam Phong swine slaughterhouse, Ho Chi Minh City, was used to evaluate the treatment efficiency of common coagulants, including Alum (Aluminum Sulfate - Al2(SO4)3.18H2O), Poly-Aluminum Chloride (PAC), and Ferrous Sulfate (FeSO4.7H2O), using a jar-test system. The experiments were conducted using the one-factor-at-a-time method to examine three variables which are pH, stirring speed, and coagulant dosage. The results showed that both Alum and PAC perform over 90% removal of colour, turbidity, COD, and total phosphorus (TP) from slaughterhouse wastewater at pH 7 with a stirring speed of 75 revolutions per minute (RPM) and average coagulant dosages of 450 mg/L for Alum and 550 mg/L for PAC. Meanwhile, under the appropriate conditions of pH equal to 10 and 75 RPM with a chemical dosage of 350 mg/L, COD and TP removal efficiencies by Ferrous Sulfate exceed 87%, but those of turbidity and colour only reach 25%. This finding could be a promising coagulation method as a pre-treatment for the swine slaughterhouse wastewater.

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Research on a High Effective Algorithm of PRACH Baseband Signal in TD-LTE System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.380-384.4031 ◽

2013 ◽

Vol 380-384 ◽

pp. 4031-4034

Author(s):

Fa Tang Chen ◽

Chi Yun Xu

Keyword(s):

Random Access ◽

Test System ◽

Effective Algorithm ◽

Conformance Test ◽

Idle Mode ◽

Generation Algorithm ◽

System A ◽

Baseband Signal

Random Access Procedure is a bridge between idle mode and connection mode in LTE system, and the algorithm of PRACH baseband signal we use will influence the performance of LTE system. A kind of High effective algorithm of PRACH baseband signal is introduced in this paper based on the research and analysis on the present PRACH baseband generation algorithm .By comparing and simulation, we find the algorithm introduced in this paper is feasible and effective. And this algorithm has been used in the RF conformance test system in LTE system.

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The Compass Time System and its Interoperation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.239-240.548 ◽

2012 ◽

Vol 239-240 ◽

pp. 548-551

Author(s):

Shao Wu Dong

Keyword(s):

Atomic Clock ◽

Test System ◽

Ground Control ◽

Time System ◽

Satellite Navigation System ◽

System A ◽

Timing System ◽

Control Centre ◽

Navigation Test ◽

Atomic Time

We report on the time reference system of Compass global satellite navigation system and its interoperation with other GNSS’s. China has sent three satellites into geostationary orbit since 2000, and Compass Navigation Test System has been established. Compass time reference, named as BDT, is based on Atomic time, BDT is derived from the atomic clock ensemble in Compass ground control centre, and be traced to the international time, UTC. Interoperability is one of the most important aspect in the design of Compass timing system, a solution of time differences determination among BDT and other GNSS time scales are introduced in this paper.

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