The invention provides a method for remedying soil heavy
metal pollution, improving
saline and alkaline land and recycling microalgae for
resource utilization through a multi-pond-alga
water circulation irrigation system, and belongs to the field of
soil remediation and
resource utilization. Through the interaction of man-made ponds, microalgae and soil, a pond-microalga combined remediation
system is adopted as the core, the soil is prepared and domesticated to remedy the microalgae, the multiple ponds are used for collecting rainwater, the microalgae are cultivated and subjected to expandingpropagation, and the microalgae are sprayed to the field; through circulation
irrigation, multi-time spraying and alga water recycling, heavy
metal in the polluted soil is taken away, the
salinity ofthe soil is reduced, the nutritional ingredients of the soil are improved, and the
soil fertility is restored; the microalgae are harvested through the method of pond enrichment and
flocculation andaeration, the alga
charcoal preparation process is utilized through combination, and
resource utilization is achieved; and the
system achieves
automatic control through a sensor, a PC and a control component. The remediation method comprises a heavy
metal /
saline and alkaline land remediation microalga cultivation system, a
water collection system, an intelligent
spray irrigation unit, a microalgarecycling system and a microalga resource utilization system.