IMPLEMENTATION METHOD FOR ELIMINATING HARMFUL ALGAL BLOOMS THROUGH OPTIMIZED UTILIZATION OF MODIFIED CLAYS

Abstract

A method for eliminating harmful algal blooms through optimized utilization of a modified clay method includes building a real-time state index and a standardized value grading system for eliminating a site harmful algal bloom or a harmful algal bloom in accordance with the features of monitored harmful algal bloom organisms and modified clay flocculates; acquiring corresponding grade codes of feature index values of the harmful algal bloom in a to-be-treated water body or harmful algal bloom elimination effect through the real-time site state index and the standardized value grading system; comparing the above grade codes with an expert system to obtain an operation solution for eliminating harmful algal blooms through optimized utilization of the modified clay method. The result is tracked and monitored in real time and the operation solution is optimized and adjusted in time according to the harmful algal bloom elimination effect.

Claims

1. An implementation method for eliminating harmful algal blooms through optimized utilization of a modified clay method, comprising: 1) building a real-time state index of algae and floc particles formed between algae and modified clays and a standardized value grading system for HABs treatment in accordance with the features of blooms and flocculation monitored in field; 2) obtaining the corresponding grade code which denotes the field algal bloom state by checking a standardized value grading system according to the state index values; 3) comparing the above grade code with an expert system to obtain an optimized operation solution for HABs treatment with the modified clays.

2. The implementation method for eliminating the harmful algal blooms through optimized utilization of the modified clay method according to claim 1, wherein after 20-30 min when a field operation is implemented in accordance with the introduced solution obtained by above programme, the chlorophyll fluorescence and the floc size in the treated water are determined; the preliminary effectiveness of treatment is judged according to the change of the chlorophyll fluorescence; if the chlorophyll fluorescence value is reduced by more than 15%, the field operation is continuously implemented in accordance with the introduced operation solution until the removal efficiency is less than 15%; if the chlorophyll fluorescence value is reduced by less than 15%, it means that the introduced operation solution is not ideally effective and a new solution should be chosen according to the real-time observation result using the above expert system again.

3. The implementation method for eliminating the harmful algal blooms through optimized utilization of the modified clay method according to claim 1, wherein the real-time state index and the standardized value grading system are designed by grading the index values after calculating the values of all indices of the HABs and the modified clay flocs in water.

4. The implementation method for eliminating the harmful algal blooms through optimized utilization of the modified clay method according to claim 1, wherein the HAB indices comprise seriousness, distribution characteristics, cell morphology, cell size, and motion capability of bloomed organisms; and the feature of the modified clay flocs is represented by the grain size of the modified clay flocs.

5. The implementation method for eliminating the harmful algal blooms through optimized utilization of the modified clay method according to claim 1, wherein the order of corresponding grade codes is consistent with the order of the determined feature indexes of the HAB and the modified clay flocs.

6. The implementation method for eliminating the harmful algal blooms through optimized utilization of the modified clay method according to claim 3, wherein the HAB seriousness is graded into low, medium and high and their corresponding codes are L, M and H, wherein low seriousness means that the chl.a concentration given by the fluorescence of the bloomed water is less than 15 g/L; medium seriousness means that the chl.a concentration given by the fluorescence of the bloomed water is 15-30 g/L; high seriousness means that the chl.a concentration given by the fluorescence of the water is greater than 30 g/L; the HABs distribution characteristics are classified into three types, i.e. fragmentary dispersion, strip type, dense cover, with corresponding codes of D, C and G respectively; HABs usually behave differently according to the local water current or tide; the cell morphology of the bloomed organisms are divided into spherical or non-spherical forms, with the corresponding codes of S and N; the spherical or subsphaeroidal shape is dominant in bloomed species; if there are hard bulges or subsidiary organelle on the cell outside but their sizes to the cell in diameter is less than , the organism is thought as sphere; otherwise, the organism is thought as non-spherical cell; the cell sizes of algae are divided into small, medium and large, and corresponding codes are L, M and N, wherein small size means that the cell diameter of the organism is less than 15 m; medium size means that the cell diameter of the organism is 15-100 m; and large size means that the cell diameter of the organism is greater than 100 m; the motion capability of the organisms is divided into low, medium and high, and corresponding codes are L, M and H, wherein low capability means that the organism does not have motion capability and is suspended under the action of the water flow, etc.; medium capability means that the organism does not have motion capability but is suspended due to phototaxis or has weak buoyant capability; high capability means that the harmful algal bloom organism has strong buoyant capability; high capability means that the harmful algal bloom organism has strong buoyant capability; the grain sizes of the modified clay flocs are divided into small, medium and large, and corresponding codes are L, M and H, wherein small grain size means that the median particle size (D50) is less than the cell diameter of the organism; medium grain size means that the median particle size (D50) is 1-5 times of the cell diameter of the organism; and large grain size means that the median particle size (D50) is more than 5 times of the cell diameter of the organism.

7. The implementation method for eliminating the harmful algal blooms through optimized utilization of the modified clay method according to claim 1, wherein the expert system is used for acquiring the operation solution including grade codes and corresponding feature grades of the harmful algal bloom organisms and corresponding operation solution code.

8. The implementation method for eliminating the harmful algal blooms through optimized utilization of the modified clay method according to claim 7, wherein the operation solution code corresponds to the concrete operation solution for sprinkling the modified clay; the operation solution is composed of sprinkling modes, and density and frequency for sprinkling the modified clay, wherein the sprinkling modes comprise raining type, pouring type or ploughing type; the sprinkling density is a proportion of the modified clay powder with seawater in a slurry which is selected in field and obtained by premixing the powder with seawater before sprinkling onto the bloomed water surface; and the sprinkling frequency means duration time, an interval and sprinkling number of times when operation at the same site.

Description

DESCRIPTION OF DRAWINGS

[0031] FIG. 1 is a structural diagram of guiding operation of eliminating harmful algal blooms based on an expert system provided in the embodiments of the present invention.

DETAILED DESCRIPTION

[0032] To make the purpose, the technical solution and the advantages of the present invention more clear, the present invention will be further described below in details through embodiments. It should be understood that concrete embodiments described for this purpose are only used to explain the present invention, not to limit the present invention.

[0033] The present invention increases algae removal efficiency of the modified clay in engineering construction through optimized utilization of the site implementation effect of eliminating the harmful algal bloom by a modified clay method. In view of the problems of work target of elimination operation, extensive use amount, etc. due to lack of a refined operation method in the existing engineering construction, the present invention provides an implementation method for eliminating harmful algal blooms through an efficient optimized modified clay method. The method proposes an optimized operation solution through programmed decisions of the expert system based on a harmful algal bloom prevention and treatment expert system having intelligent information processing capability in accordance with the feature index values of the harmful algal bloom organisms and modified clay flocculates in the water body acquired in site in real time, and adjusts the operation solution in real time according to the change of the site feature index values. The method can realize refinement and programming during site implementation of treating the harmful algal bloom using the modified clay method, and facilitates the increase of field operation efficiency of treating the harmful algal bloom using the modified clay method.

EMBODIMENTS

[0034] Heterosigma carterae of harmful algal bloom is a common harmful algal bloom organism in offshore breeding areas in China. It is found through microscopy with a microscope that cells are oval. The individual has a length of about 8-25 m and a width of about 6-15 m through determination with a fluorescence method, a counting method, a spectrophotometric method and chromatography. Heterosigma carterae has strong buoyant capability and often spreads over the whole sea area when the harmful algal bloom breaks out. The heterosigma carterae harmful algal bloom breaks out in a certain offshore bay in Qingdao. The fluorescence value of chlorophyll in vivo in the water body is monitored by an online in vivo fluorimeter in site, which is greater than 30 g/L. By referring to Table 1, grading and quantifying codes of the harmful algal bloom in this area are judged as follows: serious harmful algal bloom (H), fragmentary dispersion (D), spherical cell monomer (S), small cell (L), and strong buoyant capability (H). Letter B is added before each index. The code of the heterosigma carterae harmful algal bloom is obtained as BHDSLH in accordance with the above order. A recommended elimination solution with the harmful algal bloom code of BHDSLH is queried in Table 2 as CHHM, with the number of 332. The operation solution for sprinkling modified clay of CHHM is queried in Table 3 as follows: the sprinkling manner is field sweeping and raining type; sprinkling strength is high frequency; sprinkling concentration is medium; and the solution can be adopted in site operation.

[0035] After site construction for 30 minutes, the median particle size (D50) of flocculate is measured as 45 um within 1 meter on the surface layer of the working region with an underwater laser light scattering particle detector. If the fluorescence value of the chlorophyll in vivo in the water body is reduced to a value within 25 g/L by above 15%, the operation can be continued in accordance with the operation solution. But if the fluorescence value of the chlorophyll in vivo in the water body is still greater than 25 g/L and is reduced by below 15%, it can be preliminarily judged that the used operation solution is not ideal in the elimination effect and needs to be adjusted in time. By referring to Table 1 for the grain size features of modified clay flocculates in which the flocculate is assessed as medium (M), and Table 3 in which the harmful algal bloom code is BHDSLH and the flocculate grade is M line, it can be queried that the recommended operation solution is adjusted as CHHH. The solution has a sprinkling manner of field sweeping and raining type, and high frequency sprinkling strength and high sprinkling concentration. Field operation can be adjusted to this operation manner.

[0036] Through site online observation and expert system decisions for guiding the operation of eliminating the harmful algal bloom using modified clay, a scientific operation solution is provided rapidly for the site elimination operation of the harmful algal bloom, and can be optimized in time according to the site implementation effect. The operation solution is especially consistent with requirements for quick response and quick effect of disaster emergency control. In addition, programming operation for treating the harmful algal bloom using the modified clay method is initiated, providing a foundation for the development of harmful algal bloom prevention and treatment projects towards automatic construction.