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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 |
| 99 |
| Publisher: |
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Water Environment Federation (WEF) |
| Year: |
| 2007 |
| Order No: |
| MOP1133 |
| DOI: |
| 10.2175/1-57278-232-3-33 |
Table of Contents
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Index
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Cover Art
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Frontmatter
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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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Operating and maintaining dewatering systems and equipment requires many different skills. Because the residual solids produced at each wastewater treatment plant (WWTP) differ, operators must be aware of what to look for and what parameters to adjust to ensure effective and efficient performance of the dewatering system.
Each of the dewatering methods described in this chapter has advantages and disadvantages. Economics should drive the selection process. It is often helpful to list the specifics of the situation in terms of needs and wants. For example, if space is a severe limitation, then a disposal method is needed that does not require much space; a dewatering method that requires very little operator attention might be a good choice. The rational buyer should speculate on what changes might be made in the ultimate disposal method in the next 5 to 10 years. If, for example, development is rapidly heading for the plant, dewatering methods that require a lot of land and might cause odor are not a long-term solution. Likewise, for a small plant that will dewater 1 or 2 days a week and haul the biosolids to a nearby land application, high-performance dewatering equipment is probably not cost-effective. Ideally, the selection of major equipment is a cost-effective life-cycle evaluation-the present worth sum of the cost of equipment, maintenance, operation, and disposal. It is tempting to make an exhaustive list of costs, but, typically, the top three (capital, operating, and disposal costs) drive the decision.
The 6th edition of Chapter 33 reflects the changes in dewatering technology over the last decade or more. Vacuum filters are uncommon now, supplanted by belt filters and centrifuges. Drying beds are less popular" but reed beds are increasing, an example of "green" technology. The industry is more dependant on polymers, and this section is greatly expanded. The goal of this chapter has been to explain how the various dewatering processes work so that readers can understand them and perhaps better operate the process in their own plants.
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| List Price: $36.00 |
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©2000 Water Environment Federation