Method for remedying polluted soil through multi-pond-alga water circulation irrigation system
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A technology of polluted soil and water cycle, applied in the field of soil remediation and resource utilization, can solve problems such as soil heavy metal pollution
Active Publication Date: 2018-05-01
江苏氿官资源环境研究院有限公司
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[0006] The technical problem to be solved by the present invention is to provide a physical and microbial joint repair impr
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Embodiment 1
[0048] Improvement of moderately salinized land in a coastal area
[0049] Step 1: Microalgae preparation and domestication
[0050] 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:
[0051] SE improved seed preservation medium
[0052]
[0053]
[0054] 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 tra...
Embodiment 2
[0071] An example of repairing a Cd-contaminated soil
[0072] Step 1: Microalgae preparation and domestication
[0073] 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:
[0074] BG11 medium
[0075]
[0076] A5 trace element composition
[0077]
[0078] 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.
[0079] Apply the above culture medium for preliminary seed preservation, ...
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Abstract
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.
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...
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