nutrient removal Articles | Environmental XPRT

Nutrient removal for sewage treatment

Addition of a tertiary process provides one means of upgrading a sewage treatment plant's performance. Hans Wouters looks how this can be done using enhanced ...

Jan. 1, 2005

By Paques Technology B.V.

Biological nutrient removal in a continuous biofilm process

A new biological phosphorous and nitrogen removal process is developed. The process is based on biofilm on carrier elements with enhanced biological phosphorous removal and simultaneous nitrification and denitrification in a continuous process. Results from 3 years of pilot and laboratory experiments are presented with regards to removal of organic substances, phosphorous and nitrogen. This ...

Jan. 1, 2017

By IWA Publishing

Time Vs. Space: Two Successful Biological Nutrient Removal Strategies

Two distinct strategies have been practiced successfully for nutrient removals at a facility. One utilizes a continuous flow strategy with designated anaerobic, anoxic and aerobic zones. This strategy was targeted for biological nitrogen and phosphorus removal with minimal chemical addition. The other utilizes anaerobic, anoxic and aerobic cycle times in sequence at existing basins under a timer ...

Oct. 21, 2006

By Water Environment Federation (WEF)

A Critical New Look at Nutrient Removal Processes

ABSTRACTThis paper questions the basic practice of using large unaerated zones and large mixed liquor recycle flows to achieve TN and TP removal. It shows that the use of chemicals and different process approaches may be simpler, cheaper and, maybe, even better. INTRODUCTIONMost people in our profession seem to believe the only way to design nutrient removal wastewater treatment plants (wwtp) is ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Evaluation of nutrients removal (NO3-N, NH3-N and PO4-P) with Chlorella vulgaris, Pseudomonas putida, Bacillus cereus and a consortium of these microorganisms in the treatment of wastewater effluents

In this research removal of NH3-N, NO3-N and PO4-P nutrients from municipal wastewater was studied, using Chlorella vulgaris, Pseudomonas putida, Bacillus cereus and an artificial consortium of them. The objective is to analyze the performance of these microorganisms and their consortium, which has not been previously studied for nutrient removal in municipal wastewater. A model wastewater ...

Mar. 27, 2017

By IWA Publishing

WERF Nutrient Challenge investigates limits of nutrient removal technologies

The WERF Nutrient Challenge is a multi-year collaborative research initiative established in 2007 to develop and provide current information about wastewater treatment nutrients (specifically nitrogen and phosphorus in wastewater), their characteristics, and bioavailability in aquatic environments to help regulators make informed decisions. The Nutrient Challenge will also provide data on ...

Feb. 1, 2010

By IWA Publishing

Nitrification and denitrifying phosphorus removal in an upright continuous flow reactor

Simultaneous nitrification and denitrifying phosphorus removal was achieved in a single-sludge continuous flow bioreactor. The upright bioreactor was aligned with a biomass fermenter (BF) and operated continuously for over 350 days. This study revealed that unknown bacteria of the Saprospiraceae class may have been responsible for the successful nutrient removal in this bioreactor. The ...

Feb. 2, 2016

By IWA Publishing

Resuscitation of starved suspended- and attached-growth anaerobic ammonium oxidizing bacteria with and without acetate

Anammox application for nutrient removal from wastewater is increasing, though questions remain about anammox resilience to fluctuating conditions. Resuscitation of anammox suspended- and attached-growth cultures after 3 months of starvation was studied with and without acetate dosing. Without acetate, the attached-growth culture recovered more quickly than the suspended-growth culture. ...

Oct. 22, 2016

By IWA Publishing

Biological nutrient removal case study

The Challenge Chester Engineers was contracted by the Mountaintop Area Joint Sanitary Authority to design an upgrade to the existing treatment plant to address new Chesapeake Bay nutrient requirements and to eliminate the use of chlorine for ammonia nitrogen removal and disinfection to address trihalomethane permit violations. Chester was also required to complete the design to permit ...

Nov. 21, 2014

By Chester Engineers

Nutrient removal ability and resistance of five hydrophytes under low-temperature conditions

Five indigenous hydrophytes were studied for removal of nitrogen and phosphorus at different nutrition levels by artificial imitation of the low-temperature weather conditions of the Taihu lake area. The rate of nitrogen and phosphorus uptake was dependent on the nutrient concentrations and a positive correlation between the prolines of hydrophytes and the latter were found. High percentages of ...

Sep. 27, 2010

By Inderscience Publishers

Effects of nutrient loading on Anabaena flos-aquae biofilm: biofilm growth and nutrient removals

Effects of three different nutrient loadings (low nutrient loading, medium nutrient loading and high nutrient loading, denoted as LNS, MNS and HNS, respectively) on the structure and functions of algal biofilm using Anabaena flos-aquae were investigated using synthetic wastewater. Nutrients removal efficiencies, biofilm thickness, microalgae dehydrogenase activity (DHA) and exopolysaccharide ...

Apr. 30, 2016

By IWA Publishing

WEF/WERF study of BNR plants achieving very low N and P limits: evaluation of technology performance and process reliability

The Water Environment Research Foundation (WERF) funded a two-year comprehensive study of nutrient removal plants designed and operated to meet very low effluent total nitrogen (TN) and total phosphorus (TP) concentrations. WERF worked with the Water Environment Federation (WEF) to solicit participation of volunteers and provide a forum for information exchange at workshops at its annual ...

Feb. 1, 2012

By IWA Publishing

Nitrogen And Phosphorus Removal In Substrate-Free Pilot Constructed Wetlands With Horizontal Surface Flow In Uganda

In constructed wetlands (CWs) with horizontal sub-surface flow, nutrient removal, especially phosphorus, is limited because the root biomass fills the pore spaces of the substrate (usually gravel), directing wastewater flow to deeper wetland media, plants are not regularly harvested, the litter formed by decomposing vegetation remains on the surface of the substrate and thus does not interact ...

Jul. 1, 2005

By Springer-Verlag GmbH

Nutrient Control Design Manual

The purpose of this EPA design manual is to provide updated, state‐of‐the‐technology design guidance on nitrogen and phosphorus control at municipal Wastewater Treatment Plants (WWTPs). Similar to previous EPA manuals, this manual contains extensive information on the principles of biological nutrient removal and chemical phosphorus removal to serve as the basis for design. A ...

Oct. 3, 2012

By IWA Publishing

Putting Operators in Control a Straightforward Approach to BNR Clarifier Operation

ABSTRACT Successful operation of any activated sludge process depends on understanding the capacity of secondary clarifiers. As biological treatment facilities are operated to achieve biological nutrient removal (BNR), a careful balance must be made between reactor and secondary clarifier capacity to achieve the various treatment goals. This paper presents an approach to assist operators in ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Impacts of variable pH on stability and nutrient removal efficiency of aerobic granular sludge

The impact of pH variation on aerobic granular sludge stability and performance was investigated. A 9-day alkaline (pH = 9) and acidic (pH = 6) pH shocks were imposed on mature granules with simultaneous chemical oxygen demand (COD), nitrogen and phosphorus removal. The imposed alkaline pH shock (pH 9) reduced nitrogen and phosphorus removal efficiency from 88% and 98% to 66% and 50%, ...

Sep. 7, 2015

By IWA Publishing

Identification and evaluation of a dominant alga from municipal wastewater in removal of nutrients

To access better removal of nutrients with algae-based techniques, a dominant alga from real municipal wastewater was identified and its capacity in removing low concentrations of nitrogen (NH+4 or NO−3) and phosphorus (PO3−4) was evaluated. Results showed that Oedogonium brevicingulatum, a filamentous green alga, was confirmed as the dominant alga in the secondary effluent of a municipal ...

Oct. 1, 2016

By IWA Publishing

Effects of physical and morphometric factors on nutrient removal properties in agricultural ponds

Effects of physical and morphometric factors on nutrient removal properties were studied in small agricultural ponds with different depths, volumes, and residence times in western Japan. Average residence time was estimated to be >15 days, and it tended to decrease from summer to winter because of the increase in water withdrawal for agricultural activity. Water temperature was clearly ...

Aug. 24, 2015

By IWA Publishing

Evaluation of Several Water Reclamation Facilities Employing Biological Nutrient Removal in North Carolina

Abstract As an increasing number of lakes and streams are being classified as impaired or nutrient sensitive, a greater burden is placed on municipalities to comply with water quality restrictions. During the past decade in North Carolina, specifically in the Neuse River and Tar-Pamlico River Basins, many municipalities were required to upgrade their wastewater treatment plants for nutrient ...

Jan. 1, 2002

By Arcadis

The role and control of sludge age in biological nutrient removal activated sludge systems

The sludge age is the most fundamental and important parameter in the design, operation and control of biological nutrient removal (BNR) activated sludge (AS) systems. Generally, the better the effluent and waste sludge quality required from the system, the longer the sludge age, the larger the biological reactor and the more wastewater characteristics need to be known. Controlling the reactor ...

Apr. 1, 2010

By IWA Publishing