Schematic Diagram Of The Experimental Rig Of AGMD System Case Study

Chapter Three Experimental Work
3.2 The Experimental Rig A photograph of the experimental rig of AGMD system is shown in Figure (3-1) and the general layout of the system is shown schematically in Figure (3-2). The details of the AGMD system, equipment, measuring instruments are given in the following sections. Figure 3-1: Photograph of AGMD system.

1. Water Bath 6. Temperature sensor
2. Peristaltic pump 7. Glass Trap
3,9. Valve 10. Chiller
4,8. Pressure gauge 11. Data Acquiesce
5. Membrane module 12. Computer

Figure 3-2: Schematic diagram of the experimental rig of AGMD process.
3.2.1 Heating Unit The solution in a conical flask was heated by water bath (Meditech, water path DK-8A xx), to maintain it at a constant temperature. Hot
The stainless steel grid is used as a membrane support to maintain the air gap space. The module are made of Perspex to resist corrosion by the NaCl solution. The feed NaCl solution flows through the right cell while the cooling water passes through one side of the condensing plate in the left cell. The permeate liquid is collected in the middle cell, which is placed between the feed and coolant. The condensing plate is made of stainless steel. The AGMD system is vertically installed. The permeate and feed are separated by a porous hydrophobic membrane. The effective area of the membrane is 0.002 m2. The feed is contained in hot feed channel and is circulated through the membrane module by using a variable flow peristaltic pump. The inlet and outlet temperatures of the hot side were continually monitored. The permeated liquid was collected in a glass cylinder, and the volumes were measured at regular time
The temperature of the feed was monitored at the inlet and outlet ports of the hot feed channel by two sensors. These sensors were connected to multi-channel data acquisition system (Interface -PCI, 1712 conditiong, 6LM 35 sensors). The interface unit receives an analog signal from the sensors and converts it to a digital signal then sends it for saving in the computer.

Preparation of NaCl Solution
The salt solution was prepared by weighing (15, 35, and 45) gm of Annular (sodium chloride NaCl, M 58.44, Didactic) using sensitive balance (Kern-PLE 310-3N). Each sample was dissolved in one liter of distilled water and then mixed using magnetic stirrer (MR Hei. Standard). An electric conductivity monitor (Model DDS 307) was used to measure the conductivity for distilled water and solutions. The penetration of the NaCl through the membrane was detected via the change in conductivity of the permeate water according to equation (3.1). R(%) = (C_1-C_2)/C_1 × 100 ………………. (3.1) where R: Salt rejection. C1: Concentration of the feed NaCl solution