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Description: So, you have a grit problem?: Case studies for developing customized and successful...
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems
Grit itself is not regulated by permit requirements, but inadequate grit removal can impact a WRRF’s ability to meet effluent regulations. Grit accumulation can reduce process tank volume, which can affect treatment. The abrasiveness of gritty material also can contribute to equipment wear and failure. This decreases a facility’s reliability and redundancy criteria, which could require emergency maintenance to meet permit requirements.
Author(s)
Teri Lytle
SourceWater Environment & Technolology
Project IDWET2018_29
SubjectPermitting & Regulations; Wastewater Treatment; Operations & Maintenance;
Document typeMagazine article
PublisherWater Environment Federation
Print publication date Aug 2018
Volume / Issue30 / 8
Content sourceWE&T Magazine
First / last page(s)44 - 48
Copyright2018
Word count2,078
Subject keywordsgritaccumulationcharacterizationstudytechnology

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Description: So, you have a grit problem?: Case studies for developing customized and successful...
The problem with grit
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems
Grit itself is not regulated by permit requirements, but inadequate grit removal can impact a WRRF’s ability to meet effluent regulations. Grit accumulation can reduce process tank volume, which can affect treatment. The abrasiveness of gritty material also can contribute to equipment wear and failure. This decreases a facility’s reliability and redundancy criteria, which could require...
PublisherWater Environment Federation
Copyright2018
Word count146
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Description: So, you have a grit problem?: Case studies for developing customized and successful...
Definition and plan of attack
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems
Traditional definitions of grit are qualitative and lack any quantitative description. This makes grit difficult to characterize and standardize for practical applications. In this article, grit will refer to “inert material that settles in a tank with a surface overflow rate (SOR) less than 1750 L/m2•d (5000 gal/ft2•d).” This SOR is...
PublisherWater Environment Federation
Copyright2018
Word count136
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Description: So, you have a grit problem?: Case studies for developing customized and successful...
Step No. 1 - Understand the problem
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems
Inadequate grit removal can affect many areas of a facility. However, before developing the scope for a new or upgraded grit removal system, the true source and magnitude of the problem should be evaluated. This analysis provides information necessary to consider return on investment and whether targeting improved grit removal is the correct approach. When staff members indicate they have a...
PublisherWater Environment Federation
Copyright2018
Word count296
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Description: So, you have a grit problem?: Case studies for developing customized and successful...
Step No. 2 - Understand your grit
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems
Influent grit characteristics vary greatly among facilities. Selecting design criteria based on generalized characteristics can result in a system designed for grit particle size and distribution that does not exist at your facility. A grit sampling and characterization study is key to understanding the nature of your grit. Then you can establish custom design criteria for a successful system....
PublisherWater Environment Federation
Copyright2018
Word count990
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Description: So, you have a grit problem?: Case studies for developing customized and successful...
Step No 3. - Technology selection and design
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems
Several technologies are available for grit removal systems and each offers advantages and disadvantages. Common technologies include detritor tanks, aerated grit basins, vortex grit basins (270 degree and 360 degree), and stacked-tray basins. Considerations for selecting grit removal technology include upstream and downstream processes, performance goals, existing grit system performance,...
PublisherWater Environment Federation
Copyright2018
Word count228
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Description: So, you have a grit problem?: Case studies for developing customized and successful...
Putting it all together
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems
With this methodical approach to improving grit removal, facilities can produce custom grit solutions. The key elements of this method include the following steps.
PublisherWater Environment Federation
Copyright2018
Word count134
Read
So, you have a grit problem?: Case studies for developing customized and successful grit removal systems