Evaluation method and device of control effect of lake sediment covering material

A technology for covering materials and sediments, which is applied in the field of evaluation of the control effect of lake sediment covering materials, can solve problems such as poor control effects, and achieve the effects of avoiding blindness, saving social and economic costs, and reducing environmental risks

Active Publication Date: 2017-09-01
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the existing lake sediment in-situ control technology has poor control effect in practical application, and then provide a control effect on the release of nitrogen and phos

Method used

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  • Evaluation method and device of control effect of lake sediment covering material
  • Evaluation method and device of control effect of lake sediment covering material
  • Evaluation method and device of control effect of lake sediment covering material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Columnar sediments from 12 sampling points in different lake areas of Dianchi Lake were collected by columnar mud extractors (for the distribution of sampling points, see Figure 8 ), two columnar sediments were collected at each sampling point, and the sampling distance between the two columnar samples at the same sampling point did not exceed 5m. At the same time, the overlying water corresponding to the above-mentioned columnar sediments in the lake was collected, filtered with a 0.45um microporous membrane, and set aside. After the sediment samples were collected, some samples at the bottom of the plexiglass tube of the columnar mud sampler were removed by cutting, and then the bottom of the plexiglass tube was sealed with a rubber stopper and waterproof tape, so that the columnar sediments remained in their original state, and all columnar The sediment height was kept at 20cm, and then the columnar sediment samples were transported back to the laboratory, and the o...

Embodiment approach

[0064] Disturbance intensity simulates the influence of wind speed on hydrodynamics. According to R=0r / min, it is equivalent to no wind environment, when R=30r / min, it is equivalent to (1-2)m / s wind speed, and R=60r / min is equivalent to ( 2-3)m / s wind speed, R=90r / min is equivalent to (3-4)m / s wind speed, when R>120r / min is equivalent to (6-7)m / s wind speed and other settings . The main implementation methods are as follows:

[0065] Continuously collect 12 columnar sediment samples at sampling point D6, and the sampling distance between these columnar samples shall not exceed 10m. After the samples are collected, part of the samples at the bottom of the plexiglass tube shall be removed by cutting method, and then the plexiglass tube shall be covered with a rubber stopper and waterproof tape. The bottom of the tube is sealed to keep the columnar deposits in their original state, and the height of all columnar deposits is kept at 20cm. A specific thin layer of PVC filter scre...

Embodiment 2

[0068] According to the same method as in Example 1, the phosphorus release flux and phosphorus release control effect of sediments in different lake areas of Dianchi Lake were calculated, specifically as follows Figure 11 As shown, the phosphorus release flux in different lake areas of Dianchi Lake in the no-material control treatment varied from 0.57 to 2.44 mg m -2 d-1 Phosphorus release flux from covering material sediments varies between 0.54-1.79 mg·m -2 d -1 , the 60-day monitoring results showed that the covering materials significantly reduced the flux of phosphorus release from sediments, but the control effects of covering materials on sediment phosphorus release in different lake areas were quite different (see Figure 12 ). Different from the sediment nitrogen control area, the covering materials have a better control effect on phosphorus release in the Caohai sediments of Dianchi Lake (D1 and D2) and the lake sediments in the southeastern part of the outer sea...

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Abstract

The invention provides an evaluation method and a device of a control effect of a lake sediment covering material. The evaluation method initiatively considers the different physical and chemical properties, nitrogen and phosphorus forms and release characteristics of sediments in different lakes or different lake districts of the same lake, and evaluates the control effect of the covering material on the different types of the sediments by means of a real-time water quality monitoring system, a micro-interface measurement system, an environmental factor regulation system, system program control, data transmission and the like according to a sediment-water surface diffusion flux model on a basis of an in-situ sediment sampling technology, a sediment-water interface nitrogen-phosphorus release covering control technology, and evaluates an environmental risk of the covering material by regulating an environmental factor. According to the method and the device, a corresponding material covering project technology measure can be provided specifically to the different types of the sediments, so that project implementation blindness is avoided; the social economy cost is reduced; the environmental risk of material implementation is reduced.

Description

technical field [0001] The invention belongs to the field of water environment pollution control, in particular to a method and device for evaluating the control effect of lake sediment covering materials. Background technique [0002] Lake pollution, especially the eutrophication caused by the increase in the input of nitrogen and phosphorus, is the main problem facing lake governance in my country. At present, the improvement and restoration of eutrophic water quality are mostly focused on reducing the external load, while the nitrogen and phosphorus in the sediment The release of endogenous nitrogen and phosphorus will delay or offset the actual effects of the above measures. Therefore, under the premise that external pollution sources are effectively controlled, the study of endogenous release of sediments becomes the key to water pollution control, which makes the study of sediment nitrogen The assessment of phosphorus release risk has gradually developed into a hot issue...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N33/18
CPCG01N33/00G01N33/18
Inventor 焦立新杨苏文何佳金位栋高秋生
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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