Portable integrated system of waste water treatment and drip irrigation and its effect on heavy metal removing

摘要

Municipal waste water (WW) treatment plant, usually in large scale, centralized location, and high running cost, was not suitable in countryside, where waste water discharge was scattered and in small amount. In an European Commission Framework Plan 6th Project, SAFIR, a new concept of waste water treatment and resue was developed. In the concept, nitrogen, phosphorus, and dissoved organic matter as plant nutrition in WW were mostly kept after treatment, whereas heavy metals and pathogenic microorganisms were removed in the most degree, and drip-fertlized irrigation device was integrated into the system. To do the work, the system was composed of water store tank, pump, sandy filter, heavy metal adsorption tank, on-line UV lamp, fertilization device, and control part of Single Chip Micyoco (SCM), in which all components were portable. The benefits of this system were its nutrient recycling and water reuse, effective in harmful component remove, low cost, high automotization, quantification in irrigation, and easy extentable and portable. Result of 3 years's running showed that the system was effective, stable, and easy to operate.