SPFC Computer Controlled Sedimentation, Precipitation and Flocculation Unit

関連ニュース

概要

The Computer Controlled Sedimentation, Precipitation and Flocculation Unit, "SPFC", has been designed by EDIBON to study the parameters that affect the physicochemical treatment of wastewater for purification. The objective of the unit is to reduce colloidal and suspended matter by studying the precipitation, coagulation, flocculation and sedimentation stages.

The process starts with the supply of water to be treated to the unit, using the raw water a computer controlled supply pump for that purpose. The supply flow is obtained with the flow sensor. The raw water is introduced into the precipitation tank, where a computer controlled pump adds dissolved caustic soda to neutralize that water. Besides, there is an adjustable speed stirrer that facilitates the mixture of the reagents associated to the neutralization reaction. It also includes a temperature sensor and a pH-conductivity sensor to control the key variables of the precipitation process.

Then, water overflows onto the flocculation tank, which is divided into two parts: the coagulation tank and the flocculation tank. Water overflows from one tank to the other. The difference between them is the type of compound added for the colloids breakdown and the formation of flocs.

Coagulation takes place in the first tank by adding coagulant with a computer controlled pump. The coagulation tank includes an adjustable stirrer to break the colloids down. Thus, the mixing will be intense to obtain a uniform and quick distribution of the coagulant before the chemical reaction is generated.

Different sections are observed in the second tank. The first one is delimited by baffle walls to help the mixing process and the others are delimited by stirrers. A flocculant is added to the first section through a computer controlled pump to help in the generation of flocs. The size of those flocs grows in the other sections in order to increase the efficiency of the settling process. For that purpose, the fluid is quietened, preventing turbulences. There is an adjustable speed stirrer in each section to encourage the bond of the particles and their agglomeration as flocs.

Finally, water goes to a lamella separator, where the flocs are separated from the treated water by a settling process. The clarified water leaves through the top and is driven to the treated water tank, while sludge is accumulated in a hopper at the bottom of the unit. As a final result, treated water is stored in the purified water tank, while sludge is extracted from the separator in the sludge tank.

The unit has sampling points in each tank of the process, including the different sections of the flocculation tank. Besides, it has a conductivity meter to analyze the conductivity variation along the process and associate it with the evolution of the dissolved solids.

This Computer Controlled Unit is supplied with the EDIBON Computer Control System (SCADA), and includes: The unit itself + a Control Interface Box + a Data Acquisition Board + Computer Control, Data Acquisition and Data Management Software Packages, for controlling the process and all parameters involved in the process.

演習と指導の慣行

マニュアルに含まれるガイド付き実習

  1. Familiarization with precipitation, flocculation and sedimentation processes.
  2. Analysis of the pH influence on precipitation.
  3. Analysis of the stirring influence on precipitation, coagulation and flocculation.
  4. Study of the operation of a lamella separator and influence of the number of lamellas.
  5. Quantitative analysis of the amount of precipitant, coagulant and flocculant in the water treatment process.
  6. Determination of a steady operating state.
  7. Sensors calibration.

より実用的な練習をして、ユニットを完成させる

Additional practical possibilities:

  1. Treating wastewaters with different characteristics.
  2. Choosing the most appropriate reagents for each type of raw water thanks to the results of the gravimetric analysis.
  3. Comparing possible methods to determine the efficiency of the coagulation, flocculation and settling processes.

Other possibilities to be done with this unit:

  1. Many students view results simultaneously. To view all results in real time in the classroom by means of a projector or an electronic whiteboard.
  2. Open Control, Multicontrol and Real Time Control. This unit allows intrinsically and/or extrinsically to change the span, gains, proportional, integral, derivative parameters, etc, in real time.
  3. The Computer Control System with SCADA and PID Control allow a real industrial simulation.
  4. This unit is totally safe as uses mechanical, electrical/electronic, and software safety devices.
  5. This unit can be used for doing applied research.
  6. This unit can be used for giving training courses to Industries even to other Technical Education Institutions.
  7. Control of the SPFC unit process through the control interface box without the computer.
  8. Visualization of all the sensors values used in the SPFC unit process.
  9. By using PLC-PI additional 19 more exercises can be done.
  10. Several other exercises can be done and designed by the user.

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