Process & Equipment – ECM’s - PowerPoint Presentation

Process & Equipment – ECM’s

Screening – very low energy use, look at control strategyInfluent pumping – maximize wet well levelGrit – Optimize blower use if aerated; change sheaves to reduce power use; pump only 15 minutes per hourPrimary – Remove as many solids as possible as it reduces load on aeration; sludge and scum pumping largest user in primary; optimize pumpingSecondary – blower use high – use inlet vanes, vari-speed blowers, fine bubble diffusers; DO control; optimize DO level; timers; speed control; control header pressure Common Energy Conservation Measures ECM’s

RAS pumping can be significant since it is 40 to 100% of total forward flow. Time cycles WAS pumping only 1 to 3% of influent flow, but may have a high headDisinfection – low use, but high use of energy to produce hypochlorite or UVFiltration – most energy use in backwashing, esp if air scour; if demand billing, may be able to backwash at off-peak power rates Common ECM’s

Sludge Thickening – Gravity thickening, rotary drums, and belt thickeners are low energy consumers Sludge stabilization – aerobic digestion is a high energy user, using a blower to introduce air. Anaerobic digestion is a producer of energy. It only requires mixing. Mix intermittently; interim operation of heater recirculation pumps; mix/recirculate off-peak hoursSludge dewatering – belt presses use low energy; centrifuges are high energy consumers, however produce a drier cake; filter presses use moderate energy and produce a drier cake Common ECM’s

Pumps Vary RAS pumping with sludge blanket levelsRun RAS in on/off mode, esp. with nightly low flows(CAUTION)If have multiple pumps give more run time to most efficient pumpsIf several large pumps consider having a smaller pump to handle lower flow periodsIncrease wet well level or reduce pumping headAdd VFDsTimers for on/off operationReduce recycle flows (filter wash, foam sprays etc.)Flush lines periodicallyTrim impellers Common ECM’s

Activated Sludge Systems D.O. ControlON/OFF Timer Diffuser Cleaning & “Bumping the DiffusersConvert from Course Bubble to Fine BubbleLower D.O. setpointAdjust air drop valvesD.O. sensor locationReduce number of aeration basinsReduce pounds of solids Look for boils or unusual bubble pattern Replace or clean fine bubble diffusers Common ECM’s

Blower Systems Repair leaksPerform O & M – Clean Filters, bearing lubricationBlower intake use outside air vs room airClean and check D.O. sensors periodicallyReduce air header pressure if possibleAdjustable speed blowersNew Blower technology – Turbo Blowers Reduce air flow where possible Two blowers ON can one handle demand Common ECM’s

Mechanical Mixing Systems Confirm Submergence depthPerform O & M – Check for accumulationsReduce the number of mixers if possibleConsider not mixing pumped recycle zone Common ECM’s

Other Systems Ventilation & Odor Control - Reduce air flow to minimum needed to control odor and ensure required air changes per hourCan the system only be run seasonal when odors are the worstCan ventilation be run on/off cyclesUltraviolet System – keep lamps clean and remove scalingReplace lamps with high output lampsLighting – Turn off unneeded lights Use occupancy sensors Switch bulbs (T5,LED) Laboratory- Turn off muffle furnace and unused equipment

Building HVAC Systems Can area heater /air conditioning only be used only when people are working the areaClean air filtersHave units tuned for maximum efficiencyUse automatic thermostatsUse timers or occupancy sensorsCan heat from blower room be directed to other areaCan boiler heat be directed elsewhere

Plant Process Control Systems

Plant Process Control Systems