Microgen System

All items are specifically intended & designed for use in wastewater, runoff, and lake water applications to supply oxygen and to remove BOD, COD, SS.

The range of pressurized water discharge per unit is 1500 to 17000 Gallons per hour. In this particular project, 6 units of Microgen model Flex-200 are to operate at a rotation speed of 600 RPM, producing a total flow of 1140 GPM with all units operating in parallel.

Air or injected gas comprises 9% of the volume of the pressurized water discharge. Air/gas bubble diameters entrained in the pressurized water discharge range from 4 to 30 with an mean diameter of 14. Mean bubble ascent velocity is 0.005 ft/sec, which results in a bubble SRT in 7 ft water depth of over 20 minutes.

The static pump is manufactured with a cast iron casing, two- pressure vanes, a Geneva cam & valve, and an oil chamber. The minimum suction pressure is 29 PSI (65 feet). The valves are controlled by a Geneva Mechanism.

The pump discharges at a minimum pressure of 200 PSIG. The static pump runs continuously & without vibration, and is powered by an electric motor (motor is Explosion Proof when Oxygen is injected rather than air. Pure oxygen systems also require the use of Castrol-Brayco Oxygen Compatible Non Flammable lubrication oil.

The oxygen/air intake enclosure provided on Trailer #2 will be vented to prevent the accumulation of gas.

The operator is given the option to operate the system using pure oxygen or ambient air. The maximum oxygen transfer capacity using ambient air is 323 lbs/day. Maximum oxygen transfer capacity into runoff or lake water using pure oxygen is 1541 lbs/day. Complete system HP requirement is (7.5 HP/Microgen *6 units) + (15 HP/Suction Pump * 1 unit) = 60 HP. Henceforth with Pure Oxygen 1.07 lb O2/hp-hr, and with Ambient Air 0.22 lb O2/hp-hr.

Venturis or fine bubble diffusers which diffuse pure oxygen or air in much larger bubble sizes of 1 to 3 mm produce significantly higher lbO2/hp-hr rates. However this advantageous transfer is achieved at the expense of significantly higher pump horsepowers. Such systems offer significantly lower alpha factors and longer water retention times than Microgen.

The generating tube is manufactured of SS304 material with multi-pressure nozzles. The S-tube includes a check valve, pressure equalization valve, and self-intake protection, and is of a clog-free design.

The pressure equalization valve ensures even pressure inside of generating tube to within 3 PSIG while water is discharging.

The inlet check valve is design based on a Bernoulli effect with an air inflow control valve.

Return air pipes are be made of SS304 material. All joints are flexible.

The common base for Microgen S-tube, motor and local panel is channel iron. Welding stress is removed before assembly.

A pressure relief valve is installed at the termination of the S-tube generator.

Motors on Trailer #2 which are proximity to oxygen storage and piping are Explosion Proof Class 1 Group D. Controls are provided with NEMA 7/4 enclosures. The suction pump motor to be TEFC.

Control panel to be made of machine cast aluminum. All electrical wire and end terminals to be color coded. All electrical components will be to OSHA/ UL standards. System will start with one start switch, and is to be controlled by programmable logic controller. An emergency Stop button to be provided.

The generator shall supply sufficient power to operate all electrical components including as pumps and control panels as required. The generator fuel tank will have a capacity of min. 300 gallons, which is sufficient to run the generator for 24 hours.

The trailers are designed to be movable by a motor vehicle with a hook connection mechanism. The trailers will both have a roof and four walls. Total trailer gross weight will be within the 18,000 lbs. weight and 25 ft length limits.

The fuel tank is proposed to be 3 diameter x 6 high, and constructed of carbon steel, ± wll all thickness, with inlet and discharge connections and a pressure relief valve provided.

The water storage tank is to be 10 length x 6wide x 6deep, constructed of carbon steel with 3/16± wall thickness, and having a maximum capacity of 2200 gallons. Tank to be provided with inlet and discharge connections. Inlet is from suction pump, and discharge is by gravity feed to the manifold on Trailer #2.

The self priming pump will be MP/Jaeger model 6LT or equal with 15 HP motor, 6± inlet and 6 ± utlet, with a flow rate of 1200 GPM, discharge head of 25ft and NPSH of 23 feet. Material of construction to be cast iron housing with non clog type semi open impeller and mechanical seal.