... 2. Automatic control 3. Low cost,low noise Sewage Treatment Plant EquipmentI. SummeryWith the increase of the economy and population, ... water quality with a small amount.6. The compressed container, air compressor, circulation pump and other equipment become unnecessary, therefore, ... and hospital.2. Residence community, village and town.3. Station, air port, sea port wharf and ship.4. Factory, mine, ...