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Available as an ebook
Please purchase via www.iwaponline.comOpens in new window
Also part of Water Intelligence Online Digital Reference Library
Standard ePrice: £29.00
+ VAT
The goals of this project were to establish a standard protocol for measuring mass transfer rates in biofilm media, and to use the resulting data to develop and calibrate an empirical model. Two laboratory-scale continuous flow reactors were loaded with MBBR media donated from two manufacturers, and fed a synthetic wastewater free of organic carbon, but rich in ammonia. The reactors were aerated using coarse-bubble aeration, and operated at two different temperatures for one year. The continuous system was periodically halted to allow for batch testing of the media within each reactor. A total of 200 batch tests were conducted, at varying mixing rates, temperatures, bulk phase dissolved oxygen and ammonia concentrations. Data from the batch tests were used to develop an empirical model of ammonia mass transfer. The model includes half-order terms for bulk phase dissolved oxygen (DO) concentration and the mixing rate (expressed in terms of the velocity gradient), and an Arrhenius-type temperature dependence. A reasonable fit was obtained through non-linear regression, with an average root-mean-squared-error of less than 10 percent between model and observed ammonia flux rates. The protocol and resulting model were successfully used to compare the two media, and to project mass transfer within a nitrifying system.
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The purpose of this research project was to examine construction projects that successfully reduced Rainfall Dependent Infiltration/Inflow (RDII). The research began with a literature...
Enhanced biological phosphorus removal (EBPR) has been used for decades to remove phosphorus from municipal wastewater because it allows facilities to meet water quality goals while minimizing...
This report brings together a body of information on the characteristics of the wastewater force main network and the most common defects encountered. The technologies and methods used by...
Direct analysis of potable water for pathogenic micro-organisms has generally been avoided by water suppliers because pathogens are frequently present intermittently and in low numbers. Direct...
The overall goal of this energy project was to aid water resource recovery facilities (WRRF) in moving toward “net-zero” energy use through near-at-hand practices and technologies in the areas of...
Online monitoring of water quality is an powerful enabler in the water industry. It is a crucial component in the pro-active management of processes and assets, and helps improve performance and...
This study aims to investigate and assess:
1) the bioavailability of various P fractions, particularly dissolved P fractions (DOP), in advanced wastewater effluents
2) the nature and...
This report presents the results of an evaluation of technologies that may result in less biomass production in activated sludge processes. The report summarizes the results of a comprehensive...