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| Operations & Maintenance
OPERATIONS
The MD-1000 incorporates state-of-the-art computerized control, user-friendly operation, minimal labor requirements and maximum safety from start to finish.
The waste arrives in the processing area in plastic garbage bags and is loaded directly on cardboard trays for processing. No pre-sorting of waste is required, which greatly reduces the potential for exposure for the staff handling the waste. The operation cycle is then started and the waste is automatically conveyed into the weighing chamber where data is automatically recorded. No pre-grinding of the waste is conducted. The waste is then conveyed into the reduction chamber for processing. The computer monitors the process to ensure that each load is completely sterilized. The sterilized waste is then automatically conveyed to the cooling and grinding chamber for final processing before automatic removal for landfill disposal.
The system can be operated by housekeeping staff that need only be present to load the waste on the conveyor and start the next cycle. Staff time to operate the system is less than 10 minutes per hour.
The computer program insures the safe operation of the equipment, while automatic shutdown occurs if any part of the system registers a fault. The magnetrons cannot operate if all shutters are not properly sealed. A buffer tank insures adequate nitrogen supply in the event of a problem with the nitrogen generator. The stainless steel construction of the reduction chamber contains the microwaves so that leakage is less than a domestic microwave oven while the outside shroud virtually eliminates the potential for leakage. Microwave sensors will also shut down the operation if leakage is detected. The computer system logs all input and operational data for the diagnostics and archiving. The computer program provides data trends as required by the operators. Remote operation, data retrieval and diagnostics can be conducted by modem or over the internet.
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(click on the diagram to see enlargement)
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MAINTENANCE
While the MD-1000 is state-of-the-art, the process and design are relatively simple, which supports a long service life and reduces maintenance costs. The design and construction of the unit have included many features to facilitate maintenance.
The MD-1000 is constructed of stainless steel and heavy-duty components for safety and durability. The reduction chamber, shutters, conveyors, piping and shroud are all stainless steel. Motors and pumps are sized for many years of trouble-free operation. Moving parts and motors only operate for a short period in each cycle.
The only regular maintenance items are the shutter seals and less frequently the magnetrons which are rated for 5,000 hours of operation. Scheduled maintenance is conducted monthly to replace shutter seals while any failed magnetrons can be replaced during monthly maintenance. The unit has 14 magnetrons and can continue to operate with a many as four (4) out of service; therefore, magnetron replacement is typically conducted during scheduled maintenance periods. The computer senses when magnetrons are out of service, sends a message to the operator and adjusts the power on all remaining magnetrons to compensate. The computer monitors all systems and provides alarms and diagnostics to the operator. Remote monitoring by EWI reduces downtime and can provide remedies on-line.
Scheduled maintenance can be conducted by in-house staff after a short training course or EWI can provide an all-inclusive maintenance contract for parts and labor.
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