DESIGN AND STARTUP OF AN INNOVATIVE LARGE SCALE AUTOTHERMAL THERMOPHILIC AEROBIC DIGESTION FACILITY SUNRISE, FLORIDA

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外文摘要：Introduced to North America in the 1980抯， the autothermal thermophilic aerobicdigestion (ATAD) process has evolved from a biosolids handing component that wasused for small systems only， to the large facility at the Sawgrass。 The SawgrassPOTW is sized for over 250，000 people and is located in the City of Sunrise， Florida。In 1995， the City of Sunrise undertook to expand the Sawgrass facility。 In theirplanning they collected the untreated biosolids from their Park City and Springtreeplants for central treatment at Sawgrass。 The pre-existing aerobic digester atSawgrass was heavily loaded and experienced operational difficulties; although itoperated efficiently。 The biosolids product was land applied as a Class B biosolidsproduct。 To meet their projected solids handling needs， the City selected the ATADprocess as part of a new solids handling system。 This would compliment the existingaerobic process and achieve a Class A product， for wider application than landspreading alone。 The ATAD however， is only part of a larger system。 Initially the Cityreviewed design submissions for proprietary ATAD processes。 Again to meet theirsite-specific needs， the City instead selected a custom ATAD that would be part of aholistic system design undertaken by one engineering team。 Due to its size theSawgrass ATAD incorporates sophisticated controls and yet retains simplicity ofoperation。 The system includes two dissolved air flotation thickeners， the ATADprocess consisting of two trains of three reactors each with provision for a third train，truck loading and unloading facilities， unthickened biosolids storage， belt filter pressdewatering， air scrubbing and a supervisory control and data acquisition system。Programmable logic control， operator accessible portable computer stations， motorcontrol center and adjustable speed drives are included。 The ATAD is fully automatedto maintains setpoint reactor temperatures， undertake transfers automatically， alternatetrains， provide heat exchanger cooling， and control foam。 Operator initiated levelchanges allow optimization of digestion and energy consumption。 The process willtreat greater flows， achieve a better product on a smaller footprint and reduce energyconsumption per unit mass applied compared to the pre-existing conventional aerobicdigester。

外文关键词：

thermophilicaerobicdigestioncustom designventuri-pump aeration and mixingautomated controls

作者：

Harlan G. Kelly、Bruce Snyder、Chris Helfrich

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作者单位：

Dayton & Knight Ltd P.O. Box 91246 West Vancouver, B.C. V7V 3N9 Canada

会议名称：

Water Environment Federation annual conference & exposition;WEFTEC'99

会议地点：

New Orleans, LA(US);New Orleans, LA(US)

会议母体文献：

Water Environment Federation 72nd annual conference & exposition (WEFTEC'99)

页码：

p.1-11

出版时间：

1999