A trailer-mounted ozone system previously used for a soil ozonation pilot study is now available for use (Photographs 1 through 3 attached). However, some of the components, such as the ozone generator, may need to be rebuilt. Estimated costs to overhaul this unit range from approximately $5,000 to $10,000 (parts and labor) depending on what needs to be repaired. These repairs can be completed at the manufacturer’s shop within 1 to 2 weeks. The system has generally been reliable and operated at the site for approximately 9 months. The unit requires a single-phase, 230-volt, 60-amp electrical service. The unit is currently being stored in Eureka, California. Capacity: 45 grams per hour [2.4 pounds per day (lbs/day)] at up to 4% by weight ozone gas. The system is controlled by a programmable logic controller (PLC) with human-machine interface (HMI) and includes a full remote monitoring, instrumentation, and datalogging package. All operational parameters can be monitored remotely via a web interface or smartphone. The program consists of 9 steps in which any combination of solenoid valves can be enabled for any period of time. This unit is also equipped with a variable frequency drive (VFD) for operation of up to a 2 horsepower groundwater extraction pump or a small blower. The PLC is programmed for VFD speed control and on/off operation. This feature can be used to ozonate extracted groundwater for reinjection purposes or to run a small soil vapor extraction (SVE) blower. A complete operation and maintenance manual, equipment cut sheets, drawings (examples attached), and an assortment of spare parts is also included.
The ozone trailer features include:
•Mobile trailer (6-by-4 feet) with exhaust fan, lighting, power distribution panel, and 20-amp GFCI power outlet.
•Wall-mounted air conditioning and heating unit for operation in all weather conditions.
•Phoenix Cube® with a 45 grams per hour air-cooled ozone generator capable of delivering up to 30 standard cubic feet per hour (scfh) at 4% by weight ozone gas.
•Automation Direct Logic series PLC and C-More HMI to automate operation of system.
•Ambient ozone monitor with alarm.
•High concentration ozone analyzer.
•Built in oxygen compressor(s) and oxygen concentrator capable of up to 30 scfh at 90% purity.
•Ozone boost compressor capable of up to 30 scfh at 30 psig.
•Sparge air compressor capable of up to 4 standard cubic feet per minute at 30 pounds per square inch – gauge pressure (psig).
•Eight (8) 0.25-inch electric solenoid valves on a 1.5-inch stainless manifold.
•Three stainless steel pressure gauges to monitor oxygen, sparge and ozone discharge pressures.
•Stainless steel sample port valves at oxygen concentrator discharge, ozone generator discharge, post ozone boost compressor, and the injection manifold.
•Two flow meters to control and monitor oxygen and sparge air flows.
•Flow transmitter installed between the oxygen concentrator and gas inlet to the ozone generator.
•Flow transmitter installed at sparge compressor discharge.
•Two pressure transmitters to monitor ozone reactor pressure and injection manifold pressure.
•Input for a vacuum transmitter that can be used to signal system shutdown (e.g., SVE system failure).