class A biosolids Articles | Environmental XPRT

A Sustainable Use for Dried Biosolids

Lehigh Cement Company has conducted preliminary and in depth testing of Class A dried biosolids (DBS) as a fuel replacement in our cement kiln at Union Bridge, Maryland. Lehigh’s parent company, Heidelberg Cement, has been using DBS in European cement kilns for several years. These programs have proved the safety and environmental soundness of this concept. Lehigh’s ongoing development of these ...

Oct. 21, 2006

By Water Environment Federation (WEF)

A Tale of Three Cities – Different Approaches to Class A Biosolids Management

The management of biological treatment residuals is a significant activity associated with the overall management and operation of any successful wastewater treatment utility. Estimated operational and maintenance costs for residuals treatment and ultimate disposal can range from 40 to 60 percent of a typical annual treatment facility operating budget and also may represent a similar fraction of ...

Oct. 21, 2006

By Water Environment Federation (WEF)

A new solids technology train: can 70% volatile solids reduction and class a biosolids be achieved from digestion?

There has been an increase in interest amongst utilities to develop solids technology concept trains that result in solids volume reduction for land application. For example, the Water Environment Research Foundation has recently initiation the OWSO “optimization” program in part to develop concepts that reduce sludge volumes for beneficial reuse or disposal. Another concept that has ...

Dec. 15, 2009

By Cambi Group AS

Phosphorus and Heavy Metal Extraction from Wastewater Treatment Plant Sludges Using Microwaves for Generation of Exceptional Quality Biosolids

ABSTRACTThe objective of this study was to evaluate how much phosphorus and metals in sludge can be released into solution by microwave irradiation when applied to sludge prior to anaerobic digestion, and to determine the effectiveness of subsequent lime precipitation. For thickened sludge, the fraction of phosphorus in the soluble form increased to 23%~28% while for unthickened sludge, to ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Biosolids composting at the Borough of Mechanicsburg, PA WWTP

The Borough of Mechanicsburg, located in central Pennsylvania, was experiencing challenges in finding sufficient agricultural fields to continue the beneficial use of their anaerobically digested liquid wastewater treatment plant Class B biosolids. At the time, the only alternative available was dewatering and going to landfill, which is significantly more expensive. Due to environmental ...

Jan. 1, 2017

By IWA Publishing

Regrowth of bacterial pathogen indicators after advanced electro-osmotic dewatering of biosolids

Applying an electrical field for 10 min to mechanically dewatered biosolids increased dryness to 35 to 45% and reduced Escherichia coli levels to/close to detection limits. Possible reasons for the regrowth of bacterial pathogens impacted by electro-osmotic dewatering are biosolids dryness, low pH and the generation of bacterial oxidants on the anode due to high temperatures. Testing for this ...

Aug. 5, 2014

By Inderscience Publishers

Clay county utility authority taps BCR to cut biosolids management costs - Case study

Clay County Utility Authority’s (CCUA) installed Neutralizer® systems at each of its four wastewater treatment plants (WWTPs) between 2006 and 2010. The streamlined, patented two-stage Neutralizer® system treats waste activated sludge and produces Class A residuals for unrestricted land application in just a matter of hours. Long-Term Success: 43% reduction in annual operating ...

Dec. 5, 2020

By BCR Environmental Corporation

Large scale reality of sewage sludge paseteurisation and thermal hydrolysis

ABSTRACT Two large scale projects have been successfully brought on line utilising the thermal pretreatment to ensure production of a Class A biosolid product. In Reading (UK), the sludge is pasteurised prior to mesophilic anaerobic digestion while in Dublin (Ireland), the sludge is both pasteurised and hydrolysed prior to digestion. Sludge is pasteurised by holding a batch of sludge at 70°C ...

Dec. 18, 2009

By Cambi Group AS

Kenosha Water Utility - Energy Optimization Resource Recovery Project - Case Study

Project Roles The Kenosha Water Utility elected to use a design-build approach due to the complex and vaired technologies associated with this project. Centrisys/CNP Technology Water & Biosolids, a dewatering/thickening equipment manufacturere and nutrient recovery/sludge optimization provider, served as teh design-build developer. Donohue & Associates served as teh engineer of record. ...

Aug. 31, 2019

By CNP – Technology Water and Biosolids Corporation

Innovative approach to centrate nitrification accomplishes multiple goals: nitrogen removal and odour control

In 2001, the City of Phoenix, Arizona (USA) committed to the conversion of the existing high-rate anaerobic digestion process at the 8.9 m3/s 91st Avenue Wastewater Treatment Plant (WWTP) to a multi-phase process (acid/methane, mesophilic/thermophilic) to optimise existing digestion capacity and achieve Class A biosolids. The improved solids reduction is anticipated to double the ammonia load in ...

Mar. 1, 2010

By IWA Publishing

Two-phase anaerobic digestion for class a biosolids at moccasin bend WWTP

The Moccasin Bend Wastewater Treatment Plant (WWTP) provides treatment for the City of Chattanooga, Tennessee and the surrounding region. The City has completed upgrades to the solids handling facilities to treat and dewater the primary solids and waste activated sludge (WAS) from the WWTP. This paper summarizes the process to handle the primary solids and the start-up process. Primary solids ...

Jan. 1, 2007

By Degremont Technologies - a subsidiary of Suez Environnement

Full scale experience of retrofitting thermal hydrolysis to an existing anerobic digester for the digestion of waste activated sludge

ABSTRACT Naestved central WWTP is a 5 MGD facility that was originally designed as a Bio DeNiPho plant following primary sedimentation. In 1998 the primary tank was bypassed in order to reduce organic micro-pollutants by aerobic treatment in the aeration basins. This reduced the micro-pollutants but led to a bulky undigestible sludge and foaming due to Microthrix. The Microthrix problem was ...

Dec. 19, 2009

By Cambi Group AS

An Advanced Biosolids Treatment Process and Potential Beneficial Applications of the Processed Biosolids

ABSTRACTAn innovative and cost-effective biosolids treatment and processing technology was developed and demonstrated at a pilot and full-scale at the Guelph Wastewater Treatment Plant in Ontario. The Lystek process involves a low but optimized application of heat, alkali, and mixing in a batch or semi-continuous system to achieve the desired physical, chemical and microbiological characteristics ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Lab-scaled digestibility study of wastewater sludge treated by thermal hydrolysis

ABSTRACT High-solids mesophilic anaerobic digestion (HS-MAD) processes employing thermal hydrolytic pretreatment (THP) have gained much interest in recent years; primarily because they have been shown to produce Class A biosolids in accordance with EPA 503 regulations, but also because they represent an economical approach to the maximization of available anaerobic digester volume. The ...

Dec. 18, 2009

By Cambi Group AS

Response of Different Types of Biosolids to Simultaneous Dewatering and Pathogens Inactivation by Electrokinetic System

Only electrokinetic system and its effect on the inactivation of pathogenic organisms in biosolids were investigated. Bench scale experiments were conducted in a series of electrokinetic (EK) reactors. Ten EK reactors were set up with different types of sewage sludge: primary, secondary (attached growth culture), secondary (activated sludge), and anaerobically digested sludge, coming from Auteuil ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Advanced Digestion Plant at Bran Sands design and construct experiences

Abstract In June 2007 Northumbrian Water awarded a design and construct contract to Aker Solutions for a new advanced digestion (AD) plant at their Bran Sands site on Teesside. Following laboratory trials, advanced digestion via thermal hydrolysis was identified as the preferred treatment process for the upgrade of Bran Sands Regional Sludge Treatment Centre (RSTC). The plant will treat ...

Dec. 15, 2009

By Cambi Group AS

Pre-Treatment of Sludges Before Aerobic Digestion to Enhance Sludge Quality

ABSTRACTBench scale experimentation was completed to assess the potential of using a short residence time pre-treatment reactor upstream of aerobic digestion to enhance the destruction of pathogens. The impact of aeration, temperature, hydraulic residence time, solids concentration, feeding frequency and mechanical shearing on the pre-treatment process was investigated. Subsequent testing ...

Oct. 25, 2006

By Water Environment Federation (WEF)

Turborator Improves ATAD Performance

Description The City of McMinnville, Oregon Water Reclamation Facility (WRF) is designed to treat wastewater with advanced processes to produce exceptional quality water to be discharged back into the local river system. As part of the process, the WRF produces Class A Biosolids using an Autothermal Thermophilic Aerobic Digestion (ATAD) process. The ATAD system was designed to require three ...

Jan. 1, 2007

By MGD Process Technology Inc. (MGD)

Cambi thermal hydrolysis combined with thermophilic/mesophilic digestion - from pilot to full scale application at Hamar Wwtp

ABSTRACTDuring 2001-2003 the city and county of San Francisco completed a two-year pilot study of pre-treatment processes to mesophilic anaerobic digestion for improved biosolids stabilization and production of biosolids suitable for unrestricted reuse (class A biosolids). The pre-treatment options investigated included: A thermophilic (55 °C; TP) process with 5 days hydraulic retention time ...

Dec. 18, 2009

By Cambi Group AS

THyPAD – From Pilot to Full Scale Application at Hamar WWTP

During 2001-2003 the city and county of San Francisco completed a two-year pilot study of pretreatment processes to mesophilic anaerobic digestion for improved biosolids stabilization and production of biosolids suitable for unrestricted reuse (class A biosolids). The pre-treatment options investigated included: 1. A thermophilic (55 °C; TP) process with 5 days hydraulic retention time (HRT). ...

Oct. 21, 2006

By Water Environment Federation (WEF)