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Description: Liquid Stream Fundamentals: Filtration
Liquid Stream Fundamentals: Filtration
Tertiary filtration removes suspended solids from secondary effluent at water resource recovery facilities (WRRFs). It is a polishing step following biological treatment and secondary clarification in preparation for disinfection, final discharge, or reuse. Tertiary filtration is expected to grow in application with industry trends toward more stringent nutrient removal and increased reuse of secondary effluent. This fact sheet is part of a series on liquid stream fundamentals.
Author(s)
Water Environment Federation
SourceFact Sheet of the Water Science and Engineering Center
Project IDWSEC-2017-FS-027
CommitteeMRRDC
Sub CommitteeWEFTEC Session 306
Document typeFact Sheet
PublisherWater Environment Federation
Print publication date Oct 2017
Volume / Issue
Content sourceWater Science and Engineering Center
First / last page(s)1 - 4
Copyright2017
Word count2,737
Subject keywordsNutrientsWastewater Treatment
Associated keywords:Design
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Description: Liquid Stream Fundamentals: Filtration
Introduction
Liquid Stream Fundamentals: Filtration
The primary objective of wastewater filtration is to meet effluent permit limits by removing suspended solids, including chemical precipitated solids such as phosphorus, and attached pollutants cost effectively. Particle removal is achieved by passing wastewater through a filtering media. The measure of performance is typically effluent total suspended solids (TSS) or turbidity, although other...
PublisherWater Environment Federation
Copyright2017
Word count357
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Description: Liquid Stream Fundamentals: Filtration
Pre-Treatment
Liquid Stream Fundamentals: Filtration
Upstream processes can impact tertiary filter performance. Low solids retention time (SRT) in the biological process results in poor bioflocculation and higher particle concentrations. Higher particle concentrations in the filter influent means more, smaller particles which in turn leads to degraded filter performance and high filter effluent turbidity. High SRT leads to better bioflocculation,...
PublisherWater Environment Federation
Copyright2017
Word count141
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Description: Liquid Stream Fundamentals: Filtration
Technology Overview
Liquid Stream Fundamentals: Filtration
Traditionally, WRRFs have used deep-bed, automatic backwash, and continuous upflow granular media filtration technologies. The types of filters used at WRRFs has expanded significantly in recent years to include membrane filters, synthetic media filters, disk filters, and others aimed at reducing footprint while enhancing water quality. Advancements have also been made in sizes and types of media,...
PublisherWater Environment Federation
Copyright2017
Word count1,467
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Description: Liquid Stream Fundamentals: Filtration
Design
Liquid Stream Fundamentals: Filtration
Variability in the filter influent quality must be considered in design of tertiary filtration facilities. The nature (typically organic) and size of the solid particles as measured by a particle size distribution (PSD) should be analyzed because removal efficiency in filters for one type and size particle is different for another type and size particle. The pre-treatment modifications mentioned...
PublisherWater Environment Federation
Copyright2017
Word count581
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Description: Liquid Stream Fundamentals: Filtration
Avoiding Filtration Problems
Liquid Stream Fundamentals: Filtration
Potential problems with filter operation usually include biological growth (biogrowth) on the weirs and in the filter media , mudball formation in the filter bed, media loss, and underdrain clogging or failure.
PublisherWater Environment Federation
Copyright2017
Word count162
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Description: Liquid Stream Fundamentals: Filtration
References
Liquid Stream Fundamentals: Filtration
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PublisherWater Environment Federation
Copyright2017
Word count25
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Liquid Stream Fundamentals: Filtration
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