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MOD 30ML Demonstration Guide
Introduction
Waste water treatment is one of the most common applications found in many industries. It involves two
stages of purification of waste water: Primary waste treatment, which is first treatment and involves
removal of floating and settleable solids which are contained in the waste water; and Secondary Waste
treatment, which uses biochemical reactions to remove suspended oils, settleable solids, soluble organics
which are present in water which has undergone the primary treatment.
The following demonstration involves primary waste treatment and shows the use of:
•
integration of automatic sequential control and operator commands
•
front panel display of filter and pump status
•
operator notification and acknowledgement
•
initiation of backwash seuqence through front panel
The Control System
The primary treatment is generally done with the help of a filter vessel. The raw waste water enters the
filter bed through a control valve, and the level is allowed to rise to near full capacity. All the floating and
settleable solids are filtered as the raw water passes through the filter bed. As the solids keep accumulating
on the filter, liquid flow is restricted and this causes an increase in the pressure of the filter. When this
pressure reaches a value either the filter manufacturer or the plant operator feels to be an allowable limit,
the filter must be cleaned. This process of cleaning the filter is known as filter backwash.
Fig.1. shows the primary treatment control system.
Raw Water
Air Valve
Air Pump
Water.DOC 11/8/99
Filter Backwash Control
Filter
Fig.1. Primary treatment Control System
INDUSTRY: Water / Waste Treatment
Wash Water
BW Water
BW Pump
Filter Backwash Demonstration
Clean Water
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Table of Contents
Summary of Contents for Mod 30ML
- Page 1 MOD 30ML Demonstration Guide INDUSTRY: Water / Waste Treatment Filter Backwash Control Introduction Waste water treatment is one of the most common applications found in many industries. It involves two stages of purification of waste water: Primary waste treatment, which is first treatment and involves removal of floating and settleable solids which are contained in the waste water;...
- Page 2 One analog input is used to simulate header pressure. If the MOD 30ML demonstration kit is NOT used, the I/O should be disabled. To do this, use the TAG key to scroll to the SIMULAT display and use the arrow keys to make sure it shows DISABLE. When the I/O is disabled, all load changes can be made from their corresponding faceplate displays using the ramp keys.
- Page 3 Initial Conditions Filter status - Initialize Level - 0% Header Pressure - 20% Backwash pump, air scour pump, waste water pump OFF Activity: Step through the tag displays (FILTER, PUMP STATUS, FLOWS, CW TOTAL, HEAD PRESSURE). Press the SCROLL key on the FILTER, PUMP STATUS, and FLOWS displays.
- Page 4 Activity: Use TAG key to scroll to HEAD PRESSURE display Increase the header pressure to 91% using the ramp keys, or Pot #1 on the demonstrator box Look for: Bar graph indication of increasing header pressure Flashing display and alarm light indicating alarm Activity: Press the Alarm key Look for:...
- Page 5 Activity: With OPC selected, use the UP/DN arrow keys to scroll to BCKWASH and press ENTER Look for: Level begins to decrease because raw water valve is closed Low level alarm Activity: Use TAG key to scroll to pump status displays Look for: Air pump turns on for air scour Air pump turns off and wash water pump turns on...
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