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| Publication: |
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Operation of Municipal Wastewater Treatment Plants
Manual of Practice-MOP 11 Sixth Edition
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| Medium: |
| Download Chapter |
| Pages |
| 40 |
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Water Environment Federation (WEF) |
| Year: |
| 2005 |
| Order No: |
| MOP1114 |
| DOI: |
| 10.2175/1-57278-232-3-14 |
Table of Contents
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Index
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Cover Art
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Front Matter
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| Order Additional Chapters of MOP 11 |
Order a Hard Copy of MOP 11
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Abstract:
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A wastewater treatment plant (WWTP) consists of many separate processes. Process performance is related primarily to the flow characteristics (flowrate, biochemical oxygen demand [BOD], total suspended solids, nitrogen, and phosphorus) and equipment operation. To optimize operation of a wastewater treatment plant (WWTP), the operator must be cognizant of the interrelationships among the equipment, biological kinetics, and chemistry that make up a process and the potential effects of upstream processes and effects on downstream processes.
For example, optimization of a primary clarifier would result in more solids and potentially higher quantities of BOD removed. This would reduce the oxygen demand in the aeration basins, lowering costs by lowering oxygen requirements (and power costs) and increasing the ratio of primary sludge to secondary sludge, which may also improve dewatering characteristics. On the other hand, while the primary treatment system would be optimized, subsequent systems may suffer adverse effects. For example, thickening and digestion facilities may be overloaded or inadequate quantities of food may be available for the secondary system, particularly facilities that practice denitrification or biological phosphorous removal. This will require adjustments in sludge pump settings, mixed liquor concentrations, blower output settings, etc. The plant is interconnected and interdependent such that a change in one area affects other processes, thus necessitating an integrated approach. Many plants are large and an operator may work in only one part. It is easy to overlook the operator's contribution to plant performance as a whole. Nevertheless, their actions can and do affect other processes and overall facility performance. Operators should be aware of how other processes affect their work area, and how the process they operate affects other areas.
For the revised version of this chapter (6th edition), the process control section now includes two examples of standard operating procedures (SOPs). The list-style SOP provides information that targets the certified operator. The narrative-style SOP provides a detailed description of the procedures to be carried out. This approach is good for full documentation and training and utilities that use cross training. In addition, the process control section now contains a detailed explanation of how to read and apply a process and instrumentation diagram.
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| List Price: $27.00 |
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©2000 Water Environment Federation