A multi-pond-algal water circulation irrigation system for remediating polluted soil

Abstract

The present application relates to the field of soil remediation and resource utilization, and provides a method for remedying soil heavy metal pollution, improving saline and alkaline land, and recycling microalgae for resource utilization using a multi-pond-algae water circulating irrigation system. By means of interaction of man-made ponds, microalgae, and soil, with a pond-microalga combined remediation system as a 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 expanding propagation, and the microalgae are sprayed to the field; by means of circulating irrigation, multi-time spraying, and algae water recycling, heavy metal in the polluted soil is taken away, the salinity of the soil is reduced, nutritional ingredients of the soil are improved, and the soil fertility is restored; the microalgae are harvested by means of pond enrichment and flocculation and aeration, and in combination with the alga charcoal preparation process, resource utilization is realized; the system realizes automatic control by means of 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 microalga recycling system, and a microalga resource utilization system.

Description

Technical field:

[0001] The invention belongs to the fields of soil remediation methods and resource utilization, and relates to a soil heavy metal remediation and saline-alkali land improvement method, in particular to a physical / microbial joint soil remediation method and a microbiological method for reducing the total amount of soil heavy metals and improving saline-alkali land under drought conditions. Algae recovery, resource utilization method. Background technique:

[0002] Soil problems caused by human activities are becoming more and more serious. In recent years, the problems of soil heavy metal pollution and saline-alkali land have become particularly prominent. In terms of heavy metal pollution in soil, human activities such as accumulation of solid waste, development of metal deposits, industrial production, vehicle exhaust, use of pesticides and fertilizers, and sewage irrigation have all caused heavy metal pollution in soil. The soil survey results of about 5...

Examples

Embodiment 1

[0046] Improvement of moderately salinized land in a coastal area

[0047] Step 1: Microalgae preparation and domestication

[0048] Two kinds of nitrogen-fixing cyanobacteria and one kind of Dunaliella salina are mixed to form a microalgae group. The ratios of nitrogen-fixing cyanobacteria A, nitrogen-fixing cyanobacteria B and Dunaliella salina are 2:1:1, 3:2:1, 1:1:1 and 1 :1:3, a total of four different combinations. Using SE to improve seed preservation medium:

[0049] SE improved seed preservation medium

[0050]

[0051] The preparation method of the soil extract solution is as follows: select 100g of relatively clean soil around the area to be repaired, place it in a beaker, seal the bottle mouth with a vent plug, add 1L of deionized water, take a water bath for 2 hours, and take the supernatant after cooling , and then evaporate 90% of the liquid in the supernatant at 40° C., and the remaining part is the soil extract. The main component of the trace element n...

Embodiment 2

[0069] An example of repairing a Cd-contaminated soil

[0070] Step 1: Microalgae preparation and domestication

[0071] Select chlorella, nitrogen-fixing cyanobacteria, and spirulina to mix and prepare microalgae. The ratio of chlorella, nitrogen-fixing cyanobacteria and spirulina is 3:1:1, 3:2:1, 1:1:1, 1:1 :2 and 2:1:2, a total of five different combinations. Using BG11 improved seed preservation medium:

[0072] BG11 medium

[0073]

[0074] A5 trace element composition

[0075]

[0076] The preparation method of the soil extract solution is as follows: select 100g of relatively clean soil around the area to be repaired, place it in a beaker, seal the bottle mouth with a vent plug, add 1L of deionized water, take a water bath for 2 hours, and take the supernatant after cooling , and then evaporate 90% of the liquid in the supernatant at 40° C., and the remaining part is the soil extract.

[0077] Apply the above culture medium for preliminary seed preservation, ...

Technical field:

[0001] The invention belongs to the fields of soil remediation methods and resource utilization, and relates to a soil heavy metal remediation and saline-alkali land improvement method, in particular to a physical / microbial joint soil remediation method and a microbiological method for reducing the total amount of soil heavy metals and improving saline-alkali land under drought conditions. Algae recovery, resource utilization method. Background technique:

[0002] Soil problems caused by human activities are becoming more and more serious. In recent years, the problems of soil heavy metal pollution and saline-alkali land have become particularly prominent. In terms of heavy metal pollution in soil, human activities such as accumulation of solid waste, development of metal deposits, industrial production, vehicle exhaust, use of pesticides and fertilizers, and sewage irrigation have all caused heavy metal pollution in soil. The soil survey results of about 5...

Examples

Embodiment 1

[0046] Improvement of moderately salinized land in a coastal area

[0047] Step 1: Microalgae preparation and domestication

[0048] Two kinds of nitrogen-fixing cyanobacteria and one kind of Dunaliella salina are mixed to form a microalgae group. The ratios of nitrogen-fixing cyanobacteria A, nitrogen-fixing cyanobacteria B and Dunaliella salina are 2:1:1, 3:2:1, 1:1:1 and 1 :1:3, a total of four different combinations. Using SE to improve seed preservation medium:

[0049] SE improved seed preservation medium

[0050]

[0051] The preparation method of the soil extract solution is as follows: select 100g of relatively clean soil around the area to be repaired, place it in a beaker, seal the bottle mouth with a vent plug, add 1L of deionized water, take a water bath for 2 hours, and take the supernatant after cooling , and then evaporate 90% of the liquid in the supernatant at 40° C., and the remaining part is the soil extract. The main component of the trace element n...

Embodiment 2

[0069] An example of repairing a Cd-contaminated soil

[0070] Step 1: Microalgae preparation and domestication

[0071] Select chlorella, nitrogen-fixing cyanobacteria, and spirulina to mix and prepare microalgae. The ratio of chlorella, nitrogen-fixing cyanobacteria and spirulina is 3:1:1, 3:2:1, 1:1:1, 1:1 :2 and 2:1:2, a total of five different combinations. Using BG11 improved seed preservation medium:

[0072] BG11 medium

[0073]

[0074] A5 trace element composition

[0075]

[0076] The preparation method of the soil extract solution is as follows: select 100g of relatively clean soil around the area to be repaired, place it in a beaker, seal the bottle mouth with a vent plug, add 1L of deionized water, take a water bath for 2 hours, and take the supernatant after cooling , and then evaporate 90% of the liquid in the supernatant at 40° C., and the remaining part is the soil extract.

[0077] Apply the above culture medium for preliminary seed preservation, ...

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