Purestream, Inc. Sequencing Batch Reactor Brochure

NaturallyForConventional&Advanced Waste TreatmentSBRS P E C I A L A P P L I C AT I O N SAlthough the Purestream SBR process can be applied successfully to all biologically degradable wastewaters, with minimal operator attention, it is especially suited for the following applications:11.. Unusually strong and/or variable organic loads created by industrial wastes, such as:. MEAT AND POULTRY PROCESSING. DAIRIES. LANDFILL LEACHATES22.. Highly variable daily hydraulic flow patterns found in:. SHOPPING CENTERS. SCHOOLS. SUBDIVISIONS. CAMPGROUNDS. SMALL COMMUNITIES33.. Environmentally sensitive areas requiring advance treatment, such as:. RESORT AREAS. COMMERCIAL FISHING AREASPurestream's Sequencing Batch Reactors bring state-of-the-art, modern technologyto a 75-year-old proven process for biologically treating wastewaters. The SBR system is a natural process of fill, react, and draw — without the use of chemicals.The necessary bacteria, which are found everywhere in nature, can be selectivelychosen and cultured in the SBR process to remove carbon, nitrogen and phospho-rous found in most wastewaters. The simplicity of this time-based process makes iteasy to control and operate, resulting in an effluent that is low in carbon, nitrogenand phosphorous — usually lower than regulatory requirements.The flexibility of the SBR system allows it to adapt readily to changing conditionsof hydraulic and/or organic loads.SBR A Proven Natural ProcessADVANTAGES OFSBR SYSTEMSControl over micro-organism selection handles theorganic load.Flexibility in biological nutrient removal due to excellent control of oxygen supplied.Simplicity of operation allows instrument processmonitoring with remote data acquisition and control.Simple and minimal hardware result in low capitaland maintenance costs.Hydraulic load is handled by liquid level control.Settling occurs under perfectly quiescent conditions.No sludge recycle mechanism is required.Process (SRT) control is automatic using volumetricsludge wasting techniques.Although especially suited to variable organic andhydraulic loads, can be applied to all biologicallydegradable wastewaters.Operation is automated using simple controls for minimal operator attention.System is easily expanded with modular tankageaddition.Continuous flow plants can be easily retrofitted to the SBR mode.Process flexibility facilitates upgrading when needed. Fill: The Fill period begins with a certain amount of mixed liquor in the reactor. This provides thenecessary micro-organisms to initiate biodegradation. During Fill, wastewater is introduced at agiven rate via gravity or pumps, then mixed, and for a period of time, aerated.The Fill period can be terminated at any point by merely changing the high-level sensor setting,or by changing the react time. This variable high-level setting provides the flexibility to operate thesystem initially at a low tank level, then to increase the tank level as the flow rate increases toreach design specifications.REACT: Treatment begun during the Fill period is continued under controlled conditions in theReact phase to remove the required nutrients, i.e., carbon, nitrogen and phosphorous. TheTreatment control is air, either on or off, to produce anaerobic, anoxic or aerobic conditions.Controlling the time of mixing and/or aeration produces the degree of Treatment required. The React period is especially important in handling industrial and other hard-to-treat wastes.The on/off cycling of air and mixers provides complete nitrification, denitrification and phospho-rous removal.SETTLE: One of the major advantages of the SBR system is the creation of “perfect” conditions forthe Settle period. There is no inflow of waste, no mixing and no injection of air. A healthy activat-ed sludge floc settles rapidly — in 15-20 minutes. A design time of one hour is most adequate forthe Settle period.DECANT: Purpose of the Decant period is to remove the treated clarified supernatant without dis-turbing the settled, mixed liquor blanket.A trouble-free, floating Decant mechanism is used on the Purestream system. The Decant phasedoes not begin until the sludge blanket has settled to prevent mixed liquor solids from beingdrawn into the intake pipe.The Decant period should be as short as practical, usually no more that one to two hours.Extending the Decant time too long can cause sludge to rise. Also, this time is required as storagein a second reactor.IDLE: The Idle period is not a designated time frame but rather is that period between completionof Decant and the beginning of Fill. Idle periods occur when actual flows are less than designflows. When Idle periods are long, aeration is required to prevent septic conditions from forming.SBR PROCESSThe SBR Process normally consists of the following 5 steps:1) FILL, 2) REACT, 3) SETTLE, 4) DECANT and 5) IDLE. These reactions all occur in the same tank(s) and are sequenced according to the time requiredfor each phase. The programmable SBR control panel automatically controls the 5 process steps. The control panel is designed so that the timefor each step may be easily adjusted in the field to adapt quickly to unexpected change in conditions of either organic or hydraulic loads. Thisoperational flexibility, unique to the SBR process, insures future compliance with design performance even if the wastewater characteristicschange.This SBR process flexibility also guarantees maximum effectiveness in advance wastewater treatment, i.e., the biological removal of nitrogen andphosphorous. The key to this cost-effective method of nutrient removal is the inherent ability of the SBR system to easily provide anaerobic,anoxic and aerobic conditions for the groups of micro-organisms selected for nitrogen and phosphorous removal.10584 Dixie Highway • Walton, KY 41094Telephone: (859) 371-9898 • FAX: (859) 371-3577e-mail: purestream@purestreaminc.comWebsite: www.purestreaminc.comWASTEWATER TREATMENT EQUIPMENT