activated sludge system operation Articles
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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 ...
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Nitrification case study
The Bay View effluent treatment plant is one of the largest wastewater treatment facilities in North West Ohio, USA. The facility is located near the mouth of the Maumee River and provides treatment for an area of about 100 square miles. About 84 square miles of this area is located within Toledo city. The population that it serves is approximately 398,000. The plant operates on a 24 hour a day, ...
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A retrofitted activated-sludge plant with sequential nitritation and anammox obtains dischargeable effluent
Abstract New Activated Sludge (NAS) represents a hybrid, floc-based nitrogen removal process, based on the control of solids retention times (SRT) and dissolved oxygen (DO) levels. The aim of this study was to examine the performance of a full-scale NAS plant, which treated anaerobically digested industrial wastewater. The batch-fed partial nitritation step oxidized nitrogen to nitrite (45-47%) ...
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Chemical components of bleached eucalypt kraft pulp effluent COD and treatment removal efficiency during normal mill operation and maintenance shutdowns
In order to meet increasingly strict Brazilian COD emissions limits, mills must understand the components that contribute to effluent COD, how these vary between normal mill operation and maintenance shutdowns, and how this variation affects treatment efficiency. To this end, primary and secondary effluents from a Brazilian bleached eucalypt kraft pulp mill activated sludge system were analyzed ...
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Neptune beach wastewater treatment plant case study
Performance History and Discussion The City of Neptune Beach chose In-Pipe Technology to improve effluent quality and reduce operating expenses at the WWTP. In-Pipe Technology adds high concentrations of live, heterotrophic bacteria into the collection system - transforming it into a pretreatment reactor. As a result, the incoming pollutant load is lower and the effectiveness of the treatment ...
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Enhanced nutrient removal MBR system with chemical addition for low effluent TP
A pilot study was conducted to test an membrane bioreactor (MBR) process for combined biological and chemical P removal to achieve a very low effluent total phosphorus (TP) concentration of 0.025 mg P/L. With the data from the pilot test, a simulation study was performed to demonstrate that: (1) the pilot system behaviour (effluent quality, MLSS, etc.) can be modelled accurately with an activated ...
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Wastewater Treatment Technologies – Sequencing Batch Reactor (SBR)
There are a number of wastewater treatment technologies available including physicochemical, biological and advanced oxidation processes. We’re going to discuss a number of the options available over the coming weeks starting with a brief overview of the Sequencing Batch Reactor (SBR) process. The conventional Sequencing Batch Reactor (SBR) process has a unique operation wherein the ...
By Coftec
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7 Disadvantages of Using an Activated Sludge Process for Your Municipality or Company
7 Disadvantages of the Activated Sludge Process for Municipalities and Organization Biological treatment processes are an important component in many wastewater treatment systems. They are one of the most efficient and effective ways of reducing organic material in wastewater. There are quite a few of them that have been researched and used over several decades. However, one of the most widely ...
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Biodegradation of PPCPs in wastewater treatment plants - a Danish case study
The non-restricted production and use of pharmaceuticals and personal care products (PPCPs) has led to their presence in effluents from treatment plants, which can pose a threat to aquatic organisms downstream. This study analysed the breakdown of six common chemicals in four Danish treatment plants. The findings shed new light on the factors affecting removal of PPCPs from waste, showing that ...
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