CN111499134A - Riverbed bottom mud in-situ restoration blanket and riverbed bottom mud restoration method - Google Patents
Riverbed bottom mud in-situ restoration blanket and riverbed bottom mud restoration method Download PDFInfo
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- CN111499134A CN111499134A CN202010319062.4A CN202010319062A CN111499134A CN 111499134 A CN111499134 A CN 111499134A CN 202010319062 A CN202010319062 A CN 202010319062A CN 111499134 A CN111499134 A CN 111499134A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses a riverbed bottom mud in-situ restoration blanket, which comprises a bottom mud restoration layer, an aquatic plant layer and a substrate layer; the substrate layer is fixedly arranged on the bottom mud repairing layer, and the aquatic plant layer grows on the substrate layer; the bottom mud repairing layer comprises a supporting framework and a repairing agent layer wrapped outside the supporting framework. The invention also provides a riverbed bottom mud repairing method. The invention can effectively avoid secondary pollution caused by dredging of the river channel, simultaneously avoid the damage to the ecological balance of the bottom mud, reduce the mud layer, increase the reservoir capacity of the water body of the river channel and improve the purification of the bottom mud of the river bed, thereby achieving the effects of shortening the treatment period and obviously improving the restoration of the bottom mud of the river bed.
Description
Technical Field
The invention relates to the technical field of environmental management, in particular to a riverbed bottom mud in-situ repairing blanket and a riverbed bottom mud repairing method.
Background
At present, black and odorous water body phenomena in many cities are serious, effective treatment cannot be achieved, and even after the treatment reaches the standard in a short time, recurrence phenomena can occur, and some of the recurrence phenomena are caused by that the bottom sludge of riverbeds continuously emits toxic and harmful substances to the water body layer.
The sediment is used as one of three environmental elements (water quality, aquatic organisms and sediment) of the water ecosystem, bears double effects of receiving exogenous pollutants and releasing nutritive salts into a water body, and plays an important role in the material circulation and energy flow process of the water ecosystem. The sediment is composed of a large amount of nutrient substances (nitrogen, phosphorus, organic matters and the like), and along with the continuous accumulation of the nutrient substances, the sediment not only can have important influence on benthonic organisms existing in the sediment, but also the inherent nutrient substances can enter an upper-layer water body along with the movement of the water body, so that the concentration of the nutrient substances such as nitrogen, phosphorus and the like in the water body is increased, and the eutrophication degree of the water body and the outbreak probability of algal bloom are aggravated. At present, urban river sediment is repaired by a plurality of methods, namely river sediment dredging, sediment covering and original-taste microorganism repair of the sediment.
The river dredging technology has obvious effect to a certain extent, but the cost is high on the whole. In addition, measures are required to be taken to prevent secondary pollution in the dredging process, and the removed polluted bottom mud is safely treated. The dredging of the sediment can take away benthos and microorganisms, break the long-term formed ecological balance, interrupt the food chain in the ecological system and cause new environmental problems.
The substrate sludge covering, namely covering one or more covering layers on the upper part of the polluted substrate sludge to separate the substrate sludge from overlying water and prevent the release of pollutants in the substrate sludge, is another polluted substrate sludge in-situ remediation technology which is widely concerned at home and abroad. The bottom mud covering technology has the problems of large engineering quantity, large quantity of cleaning silt and the like, and difficult source. Meanwhile, the amount of bottom mud is increased by covering, so that the storage capacity of the water body is reduced.
The in-situ bioremediation of the sediment refers to the bioremediation of the original place without carrying or transporting polluted environmental objects under the condition of basically not damaging the natural environment of the sediment of the water body. The limitations are that the periodicity of microbial growth leads to slow effectiveness of the technology and the complexity of the environment leads to frequent microbial failure to survive and culture failure.
Disclosure of Invention
The invention provides a riverbed bottom mud in-situ repairing blanket and a riverbed bottom mud repairing method, which aim to solve the problems in the background technology.
The invention provides a riverbed bottom mud in-situ restoration blanket, which comprises a bottom mud restoration layer, an aquatic plant layer and a substrate layer;
the substrate layer is fixedly arranged on the bottom mud repairing layer, and the aquatic plant layer grows on the substrate layer;
the bottom mud repairing layer comprises a supporting framework and a repairing agent layer wrapped outside the supporting framework.
Furthermore, a plurality of through holes are formed in the bottom mud repairing layer, the aquatic plant layer and the matrix layer in a penetrating mode at equal intervals.
Furthermore, the substrate layer is of a porous structure, and a plurality of channels penetrate through the substrate layer at equal intervals along the layer width direction.
Furthermore, protrusions of a wave structure are arranged in the channel along the length direction of the channel.
Further, the support skeleton comprises a carrier plate and an insert rod densely distributed on the carrier plate, and the repairing agent layer is wrapped outside the carrier plate and the insert rod.
Further, the support skeleton is made of degradable plant fibers.
Further, the repairing agent layer comprises EM strain, brown sugar, honey, agricultural sludge and clay, wherein the EM strain accounts for 0.03-0.08% of the repairing agent layer, the brown sugar accounts for 0.06-0.16% of the repairing agent layer, the honey accounts for 0.015-0.04% of the repairing agent layer, the agricultural sludge accounts for 15-30% of the repairing agent layer, and the clay accounts for the rest.
Further, the substrate layer comprises EM strain, brown sugar, honey, a curing agent, sepiolite, agricultural sludge, plant fiber and clay, wherein the EM strain accounts for 0.03-0.08% of the substrate layer, the brown sugar accounts for 0.06-0.16% of the substrate layer, the honey accounts for 0.015-0.04% of the substrate layer, the curing agent accounts for 1.0-2.5% of the substrate layer, the sepiolite accounts for 3-10% of the substrate layer, the agricultural sludge accounts for 5-12%, the plant fiber accounts for 10-15% of the substrate layer and the clay accounts for the balance.
Further, any one or more of calcium peroxide, calcium carbonate or calcium chloride.
Further, the aquatic plant layer is emergent aquatic plant and submerged plant mixed planting layer, wherein the vegetation area ratio of emergent aquatic plant and submerged plant is 1: 2-5.
The invention also provides a method for repairing the bottom sediment of the riverbed by the in-situ repair blanket of the bottom sediment of the riverbed, which comprises the following steps:
s1, carrying out cofferdam segmentation separation on the treatment areas, respectively carrying out sewage interception treatment on the treatment sections, and then draining the treatment sections until a sludge layer at the bottom is exposed;
s2, manually cleaning the garbage on the surface of the sludge layer, and paving the in-situ riverbed bottom mud repairing blanket on the surface of the sludge layer in the treatment section after cleaning;
s3, after the step S2 is completed, integrally fixing the riverbed bottom mud in-situ restoration blanket paved in the treatment section, paving and reinforcing by adopting a degradable plant fiber woven net with the same area as the treatment section, and fixing the edge of the plant fiber woven net by adopting a timber pile;
s4, paving and fixing the in-situ repair blanket of the river bed bottom mud of each treatment section, and flattening the cofferdam.
Further, in S2, for the non-closed treatment area, the laying direction of the channels 4 in the riverbed bottom sediment in-situ remediation blanket should be consistent with the water flow direction.
Further, in S2, when the riverbed bottom mud in-situ remediation blanket is laid, the bottom mud remediation layer is completely embedded into the mud layer, and the substrate layer is located above the mud layer.
The in-situ riverbed bottom mud repairing blanket and the riverbed bottom mud repairing method provided by the invention have the beneficial effects that:
(1) the method adopts a repairing blanket laying mode to cover the surface of the bottom mud, does not need to carry out riverway dredging treatment on the riverbed bottom mud, can effectively avoid secondary pollution caused by riverway dredging, and simultaneously avoids the damage to the ecological balance of the bottom mud.
(2) The invention adopts the mode of paving the repair blanket to cover the surface of the sediment, avoids the use of a large amount of clean silt, reduces the amount of the bottom sediment of the riverbed, can effectively degrade the excessive nutrient substance components in the sediment layer through the sediment repair layer at the bottom of the repair blanket, further thins the sediment layer, increases the reservoir capacity of the riverway water body, and improves the characteristics of the sediment layer such as compact aggregate structure, hydrophobicity and the like.
(3) The bed mud repairing layer is used for carrying out bed mud microbial repairing on the sludge layer, pollutants such as heavy metals contained in the sludge layer are sealed in the bed mud, the amount of the pollutants entering an upper water body is reduced, meanwhile, the water body is synchronously purified by the aquatic plant layer, so that excessive nutrient substances in the water body are reduced, the repairing of the bed mud is further accelerated, in addition, the pollution particles floating in the bed water body are further intercepted through the holes and the channels on the matrix layer, the purifying of the bed mud is further improved, and the effects of shortening the treatment period and obviously improving the repairing effect of the bed mud are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of the riverbed bottom sediment in-situ remediation blanket according to the invention.
Labeled as: 1. a bottom mud repairing layer; 2. an aquatic plant layer; 3. a substrate layer; 4. a channel; 5. a protrusion; 6. a support framework; 61. a carrier plate; 62. an insertion rod; 7. a repair agent layer; 8. and a through hole.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "provided with" and "connected" are to be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The structural features of the present invention will now be described in detail with reference to the accompanying drawings.
The invention is further illustrated by the following examples.
Example 1
Referring to fig. 1, the in-situ riverbed bottom mud repairing blanket comprises a bottom mud repairing layer 1, an aquatic plant layer 2 and a matrix layer 3, wherein the bottom mud repairing layer 1 is used for repairing the riverbed bottom mud, the aquatic plant layer 2 is used for purifying and repairing the riverbed water body, the period of repairing the riverbed bottom mud is effectively shortened through the combination of the bottom mud repairing layer 1 and the aquatic plant layer, and the repairing effect is improved.
The repairing agent layer comprises 0.03 percent of EM strain, 0.06 percent of brown sugar, 0.015 percent of honey, 15 percent of agricultural sludge and the balance of clay according to the weight percentage. Brown sugar and honey are used for activating EM strains to grow, agricultural sludge is used as a substrate for the EM strains to grow, and clay is used for mixing other components and adhering the components to a supporting framework.
The matrix layer comprises 0.03 percent of EM strain, 0.06 percent of brown sugar, 0.015 percent of honey, 1.0 percent of curing agent, 3 percent of sepiolite, 5 percent of agricultural sludge, 10 percent of plant fiber and the balance of clay. Brown sugar and honey are used for activating EM strains to grow, agricultural sludge is used as a substrate for the growth of the EM strains, plant fibers form a porous structure of the substrate layer, clay is used for forming the substrate layer, and a curing agent is used for curing the substrate layer and calcium peroxide, calcium carbonate or calcium chloride.
The matrix layer 3 is fixedly arranged on the bottom mud repairing layer 1, the aquatic plant layer 2 grows on the matrix layer 3, and the matrix layer 3 is used for fixing the aquatic plant layer 2 and further adsorbing pollution particles suspended in the water body of the riverbed to promote the repairing of the bottom mud of the riverbed. The aquatic plant layer is emergent aquatic plant and submerged plant mixed planting layer, and wherein the vegetation area ratio of emergent aquatic plant and submerged plant is 1: 2.
the bottom mud repairing layer 1 comprises a supporting framework 6 and a repairing agent layer 7 wrapped outside the supporting framework 6, the supporting framework 6 is used for improving the stability of the bottom mud repairing layer 1, the bottom mud repairing layer 1 can better enter bottom mud of a river bed, the repairing agent layer 7 is used for repairing the bottom mud, and after the bottom mud repairing layer 1 enters the mud layer of the river bed, the repairing agent layer 7 can be dissolved and dispersed to repair the mud layer of the river bed.
The in-situ riverbed bottom mud restoration blanket is covered on the surface of the bottom mud in a restoration blanket laying mode, riverbed bottom mud does not need to be subjected to riverway dredging treatment, secondary pollution caused by riverway dredging can be effectively avoided, and meanwhile, the ecological balance of the bottom mud is prevented from being damaged. The bottom mud repairing layer at the bottom of the repairing blanket can effectively degrade excessive nutrient components in the mud layer, further thin the mud layer, increase the reservoir capacity of the river channel water body, and improve the characteristics of the mud layer such as compact aggregate structure, hydrophobicity and the like. The bottom mud is subjected to bottom mud microbial remediation through the bottom mud remediation layer, pollutants such as heavy metals contained in the sludge layer are sealed in the bottom mud, the amount of the pollutants entering an upper water body is reduced, meanwhile, the water body is synchronously purified by the aquatic plant layer, so that the surplus nutrient substances in the water body are reduced, the remediation of the bottom mud of the river bed is further accelerated, in addition, the pollution particles floating in the water body of the river bed are further intercepted through the holes and the channels on the matrix layer, the purification of the bottom mud of the river bed is further improved, and the effects of shortening the treatment period and obviously improving the remediation of the bottom mud of the river bed are achieved.
Referring to fig. 1, further, a plurality of through holes 8 are formed in the bottom sediment repairing layer 1, the aquatic plant layer 2 and the matrix layer 3 at equal intervals in a penetrating manner, and the through holes 8 are used for enabling aquatic organisms in the bottom sediment of the river bed to penetrate through the repairing blanket and enter the water body, so that damage to food chains at the bottom of the in-situ repairing blanket of the bottom sediment of the river bed is avoided.
Referring to fig. 1, further, a plurality of channels 4 penetrate through the substrate layer 3 at equal intervals along the width direction of the substrate layer, protrusions 5 of a wave structure are arranged in the channels 4 along the length direction of the substrate layer, when the riverbed bottom mud in-situ restoration blanket is laid, the substrate layer 3 is located above the riverbed bottom mud, pollution particles floating in a water body, such as silt, can be adsorbed in the substrate layer 3 or in the channels 4, and the protrusions 5 in the channels 4 are more beneficial to intercepting and accumulating the pollution particles, so that the water body is evolved, and the restoration of the riverbed bottom mud is further realized.
Referring to fig. 1, further, the supporting framework 6 comprises a carrier plate 61 and insertion rods 62 densely distributed on the carrier plate 61, the repairing agent layer 7 is wrapped outside the carrier plate 61 and the insertion rods 62, the supporting framework 6 is made of degradable plant fibers, the arrangement of the insertion rods 62 can increase the contact area of the repairing agent layer 7 and the sludge layer, so that the insertion rods 62 are uniformly distributed in the whole bottom sludge, and meanwhile, the arrangement of the insertion rods 62 can enable the bottom sludge repairing layer 1 to be better inserted into the bottom sludge of the river bed.
The invention also provides a riverbed bottom mud repairing method, which comprises the following steps:
s1, carrying out cofferdam segmentation separation on the treatment areas, respectively carrying out sewage interception treatment on the treatment sections, and then draining the treatment sections until a sludge layer at the bottom is exposed;
s2, manually cleaning the garbage on the surface of the sludge layer, and paving the in-situ riverbed bottom mud repairing blanket on the surface of the sludge layer in the treatment section after cleaning;
s3, after the step S2 is completed, integrally fixing the riverbed bottom mud in-situ restoration blanket paved in the treatment section, paving and reinforcing by adopting a degradable plant fiber woven net with the same area as the treatment section, and fixing the edge of the plant fiber woven net by adopting a timber pile;
s4, paving and fixing the in-situ repair blanket of the river bed bottom mud of each treatment section, and flattening the cofferdam.
In S2, for the non-closed treatment area, the laying direction of the channels 4 in the riverbed bottom mud in-situ remediation blanket should be consistent with the water flow direction, and the consistency of the channels 4 with the water flow direction can enable pollutants in the water to be better accumulated in the channels 4 and intercepted by the protrusions 5 in the channels 4.
In S2, when the riverbed bottom mud in-situ remediation blanket is laid, the bottom mud remediation layer is completely embedded into the sludge layer, and the substrate layer is located above the sludge layer.
Example 2
Referring to fig. 1, the in-situ riverbed bottom mud repairing blanket comprises a bottom mud repairing layer 1, an aquatic plant layer 2 and a matrix layer 3, wherein the bottom mud repairing layer 1 is used for repairing the riverbed bottom mud, the aquatic plant layer 2 is used for purifying and repairing the riverbed water body, the period of repairing the riverbed bottom mud is effectively shortened through the combination of the bottom mud repairing layer 1 and the aquatic plant layer, and the repairing effect is improved.
The repairing agent layer comprises 0.05% of EM strain, 0.10% of brown sugar, 0.025% of honey, 23% of agricultural sludge and the balance of clay in percentage by weight. Brown sugar and honey are used for activating EM strains to grow, agricultural sludge is used as a substrate for the EM strains to grow, and clay is used for mixing other components and adhering the components to a supporting framework.
The matrix layer comprises 0.05 percent of EM strain, 0.10 percent of brown sugar, 0.025 percent of honey, 2.0 percent of curing agent, 6 percent of sepiolite, 9 percent of agricultural sludge, 12 percent of plant fiber and the balance of clay by weight percentage. Brown sugar and honey are used for activating EM strains to grow, agricultural sludge is used as a substrate for the growth of the EM strains, plant fibers form a porous structure of the substrate layer, clay is used for forming the substrate layer, and a curing agent is used for curing the substrate layer and calcium peroxide, calcium carbonate or calcium chloride.
The matrix layer 3 is fixedly arranged on the bottom mud repairing layer 1, the aquatic plant layer 2 grows on the matrix layer 3, and the matrix layer 3 is used for fixing the aquatic plant layer 2 and further adsorbing pollution particles suspended in the water body of the riverbed to promote the repairing of the bottom mud of the riverbed. The aquatic plant layer is emergent aquatic plant and submerged plant mixed planting layer, and wherein the vegetation area ratio of emergent aquatic plant and submerged plant is 1: 4.5.
the bottom mud repairing layer 1 comprises a supporting framework 6 and a repairing agent layer 7 wrapped outside the supporting framework 6, the supporting framework 6 is used for improving the stability of the bottom mud repairing layer 1, the bottom mud repairing layer 1 can better enter bottom mud of a river bed, the repairing agent layer 7 is used for repairing the bottom mud, and after the bottom mud repairing layer 1 enters the mud layer of the river bed, the repairing agent layer 7 can be dissolved and dispersed to repair the mud layer of the river bed.
The in-situ riverbed bottom mud restoration blanket is covered on the surface of the bottom mud in a restoration blanket laying mode, riverbed bottom mud does not need to be subjected to riverway dredging treatment, secondary pollution caused by riverway dredging can be effectively avoided, and meanwhile, the ecological balance of the bottom mud is prevented from being damaged. The bottom mud repairing layer at the bottom of the repairing blanket can effectively degrade excessive nutrient components in the mud layer, further thin the mud layer, increase the reservoir capacity of the river channel water body, and improve the characteristics of the mud layer such as compact aggregate structure, hydrophobicity and the like. The bottom mud is subjected to bottom mud microbial remediation through the bottom mud remediation layer, pollutants such as heavy metals contained in the sludge layer are sealed in the bottom mud, the amount of the pollutants entering an upper water body is reduced, meanwhile, the water body is synchronously purified by the aquatic plant layer, so that the surplus nutrient substances in the water body are reduced, the remediation of the bottom mud of the river bed is further accelerated, in addition, the pollution particles floating in the water body of the river bed are further intercepted through the holes and the channels on the matrix layer, the purification of the bottom mud of the river bed is further improved, and the effects of shortening the treatment period and obviously improving the remediation of the bottom mud of the river bed are achieved.
Referring to fig. 1, further, a plurality of through holes 8 are formed in the bottom sediment repairing layer 1, the aquatic plant layer 2 and the matrix layer 3 at equal intervals in a penetrating manner, and the through holes 8 are used for enabling aquatic organisms in the bottom sediment of the river bed to penetrate through the repairing blanket and enter the water body, so that damage to food chains at the bottom of the in-situ repairing blanket of the bottom sediment of the river bed is avoided.
Referring to fig. 1, further, a plurality of channels 4 penetrate through the substrate layer 3 at equal intervals along the width direction of the substrate layer, protrusions 5 of a wave structure are arranged in the channels 4 along the length direction of the substrate layer, when the riverbed bottom mud in-situ restoration blanket is laid, the substrate layer 3 is located above the riverbed bottom mud, pollution particles floating in a water body, such as silt, can be adsorbed in the substrate layer 3 or in the channels 4, and the protrusions 5 in the channels 4 are more beneficial to intercepting and accumulating the pollution particles, so that the water body is evolved, and the restoration of the riverbed bottom mud is further realized.
Referring to fig. 1, further, the supporting framework 6 comprises a carrier plate 61 and insertion rods 62 densely distributed on the carrier plate 61, the repairing agent layer 7 is wrapped outside the carrier plate 61 and the insertion rods 62, the supporting framework 6 is made of degradable plant fibers, the arrangement of the insertion rods 62 can increase the contact area of the repairing agent layer 7 and the sludge layer, so that the insertion rods 62 are uniformly distributed in the whole bottom sludge, and meanwhile, the arrangement of the insertion rods 62 can enable the bottom sludge repairing layer 1 to be better inserted into the bottom sludge of the river bed.
The invention also provides a riverbed bottom mud repairing method, which comprises the following steps:
s1, carrying out cofferdam segmentation separation on the treatment areas, respectively carrying out sewage interception treatment on the treatment sections, and then draining the treatment sections until a sludge layer at the bottom is exposed;
s2, manually cleaning the garbage on the surface of the sludge layer, and paving the in-situ riverbed bottom mud repairing blanket on the surface of the sludge layer in the treatment section after cleaning;
s3, after the step S2 is completed, integrally fixing the riverbed bottom mud in-situ restoration blanket paved in the treatment section, paving and reinforcing by adopting a degradable plant fiber woven net with the same area as the treatment section, and fixing the edge of the plant fiber woven net by adopting a timber pile;
s4, paving and fixing the in-situ repair blanket of the river bed bottom mud of each treatment section, and flattening the cofferdam.
In S2, for the non-closed treatment area, the laying direction of the channels 4 in the riverbed bottom mud in-situ remediation blanket should be consistent with the water flow direction, and the consistency of the channels 4 with the water flow direction can enable pollutants in the water to be better accumulated in the channels 4 and intercepted by the protrusions 5 in the channels 4.
In S2, when the riverbed bottom mud in-situ remediation blanket is laid, the bottom mud remediation layer is completely embedded into the sludge layer, and the substrate layer is located above the sludge layer.
Example 3
Referring to fig. 1, the in-situ riverbed bottom mud repairing blanket comprises a bottom mud repairing layer 1, an aquatic plant layer 2 and a matrix layer 3, wherein the bottom mud repairing layer 1 is used for repairing the riverbed bottom mud, the aquatic plant layer 2 is used for purifying and repairing the riverbed water body, the period of repairing the riverbed bottom mud is effectively shortened through the combination of the bottom mud repairing layer 1 and the aquatic plant layer, and the repairing effect is improved.
The repairing agent layer comprises EM strain, brown sugar, honey, agricultural sludge and clay, wherein the EM strain accounts for 0.08 percent of the repairing agent layer, the brown sugar accounts for 0.16 percent of the repairing agent layer, the honey accounts for 0.004 percent of the repairing agent layer, the agricultural sludge accounts for 30 percent of the repairing agent layer, and the clay accounts for the rest. Brown sugar and honey are used for activating EM strains to grow, agricultural sludge is used as a substrate for the EM strains to grow, and clay is used for mixing other components and adhering the components to a supporting framework.
The matrix layer comprises 0.08 percent of EM strain, 0.16 percent of brown sugar, 0.004 percent of honey, 2.5 percent of curing agent, 10 percent of sepiolite, 12 percent of agricultural sludge, 15 percent of plant fiber and the balance of clay. Brown sugar and honey are used for activating EM strains to grow, agricultural sludge is used as a substrate for the growth of the EM strains, plant fibers form a porous structure of the substrate layer, clay is used for forming the substrate layer, and a curing agent is used for curing the substrate layer and calcium peroxide, calcium carbonate or calcium chloride.
The matrix layer 3 is fixedly arranged on the bottom mud repairing layer 1, the aquatic plant layer 2 grows on the matrix layer 3, and the matrix layer 3 is used for fixing the aquatic plant layer 2 and further adsorbing pollution particles suspended in the water body of the riverbed to promote the repairing of the bottom mud of the riverbed. The aquatic plant layer is emergent aquatic plant and submerged plant mixed planting layer, and wherein the vegetation area ratio of emergent aquatic plant and submerged plant is 1: 5.
the bottom mud repairing layer 1 comprises a supporting framework 6 and a repairing agent layer 7 wrapped outside the supporting framework 6, the supporting framework 6 is used for improving the stability of the bottom mud repairing layer 1, the bottom mud repairing layer 1 can better enter bottom mud of a river bed, the repairing agent layer 7 is used for repairing the bottom mud, and after the bottom mud repairing layer 1 enters the mud layer of the river bed, the repairing agent layer 7 can be dissolved and dispersed to repair the mud layer of the river bed.
The in-situ riverbed bottom mud restoration blanket is covered on the surface of the bottom mud in a restoration blanket laying mode, riverbed bottom mud does not need to be subjected to riverway dredging treatment, secondary pollution caused by riverway dredging can be effectively avoided, and meanwhile, the ecological balance of the bottom mud is prevented from being damaged. The bottom mud repairing layer at the bottom of the repairing blanket can effectively degrade excessive nutrient components in the mud layer, further thin the mud layer, increase the reservoir capacity of the river channel water body, and improve the characteristics of the mud layer such as compact aggregate structure, hydrophobicity and the like. The bottom mud is subjected to bottom mud microbial remediation through the bottom mud remediation layer, pollutants such as heavy metals contained in the sludge layer are sealed in the bottom mud, the amount of the pollutants entering an upper water body is reduced, meanwhile, the water body is synchronously purified by the aquatic plant layer, so that the surplus nutrient substances in the water body are reduced, the remediation of the bottom mud of the river bed is further accelerated, in addition, the pollution particles floating in the water body of the river bed are further intercepted through the holes and the channels on the matrix layer, the purification of the bottom mud of the river bed is further improved, and the effects of shortening the treatment period and obviously improving the remediation of the bottom mud of the river bed are achieved.
Referring to fig. 1, further, a plurality of through holes 8 are formed in the bottom sediment repairing layer 1, the aquatic plant layer 2 and the matrix layer 3 at equal intervals in a penetrating manner, and the through holes 8 are used for enabling aquatic organisms in the bottom sediment of the river bed to penetrate through the repairing blanket and enter the water body, so that damage to food chains at the bottom of the in-situ repairing blanket of the bottom sediment of the river bed is avoided.
Referring to fig. 1, further, a plurality of channels 4 penetrate through the substrate layer 3 at equal intervals along the width direction of the substrate layer, protrusions 5 of a wave structure are arranged in the channels 4 along the length direction of the substrate layer, when the riverbed bottom mud in-situ restoration blanket is laid, the substrate layer 3 is located above the riverbed bottom mud, pollution particles floating in a water body, such as silt, can be adsorbed in the substrate layer 3 or in the channels 4, and the protrusions 5 in the channels 4 are more beneficial to intercepting and accumulating the pollution particles, so that the water body is evolved, and the restoration of the riverbed bottom mud is further realized.
Referring to fig. 1, further, the supporting framework 6 comprises a carrier plate 61 and insertion rods 62 densely distributed on the carrier plate 61, the repairing agent layer 7 is wrapped outside the carrier plate 61 and the insertion rods 62, the supporting framework 6 is made of degradable plant fibers, the arrangement of the insertion rods 62 can increase the contact area of the repairing agent layer 7 and the sludge layer, so that the insertion rods 62 are uniformly distributed in the whole bottom sludge, and meanwhile, the arrangement of the insertion rods 62 can enable the bottom sludge repairing layer 1 to be better inserted into the bottom sludge of the river bed.
The invention also provides a riverbed bottom mud repairing method, which comprises the following steps:
s1, carrying out cofferdam segmentation separation on the treatment areas, respectively carrying out sewage interception treatment on the treatment sections, and then draining the treatment sections until a sludge layer at the bottom is exposed;
s2, manually cleaning the garbage on the surface of the sludge layer, and paving the in-situ riverbed bottom mud repairing blanket on the surface of the sludge layer in the treatment section after cleaning;
s3, after the step S2 is completed, integrally fixing the riverbed bottom mud in-situ restoration blanket paved in the treatment section, paving and reinforcing by adopting a degradable plant fiber woven net with the same area as the treatment section, and fixing the edge of the plant fiber woven net by adopting a timber pile;
s4, paving and fixing the in-situ repair blanket of the river bed bottom mud of each treatment section, and flattening the cofferdam.
In S2, for the non-closed treatment area, the laying direction of the channels 4 in the riverbed bottom mud in-situ remediation blanket should be consistent with the water flow direction, and the consistency of the channels 4 with the water flow direction can enable pollutants in the water to be better accumulated in the channels 4 and intercepted by the protrusions 5 in the channels 4.
In S2, when the riverbed bottom mud in-situ remediation blanket is laid, the bottom mud remediation layer is completely embedded into the sludge layer, and the substrate layer is located above the sludge layer.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. An in-situ riverbed bottom mud repairing blanket is characterized by comprising a bottom mud repairing layer (1), an aquatic plant layer (2) and a substrate layer (3);
the substrate layer (3) is fixedly arranged on the bottom mud repairing layer (1), and the aquatic plant layer (2) grows on the substrate layer (3);
the bottom mud repairing layer (1) comprises a supporting framework (6) and a repairing agent layer (7) wrapped outside the supporting framework (6).
2. The riverbed bottom mud in-situ remediation blanket according to claim 1, wherein the bottom mud remediation layer (1), the aquatic plant layer (2) and the substrate layer (3) are provided with a plurality of through holes (8) at equal intervals.
3. The blanket for in-situ remediation of riverbed bottom sediment according to claim 1, wherein the substrate layer (3) has a porous structure, and a plurality of channels (4) are formed in the substrate layer (3) at equal intervals along the width direction of the substrate layer.
4. Blanket for in situ remediation of riverbed bottom sediment according to claim 3, wherein the channel (4) is provided with wave-structured protrusions (5) along its length.
5. Blanket according to claim 3, wherein said supporting skeleton (6) comprises a carrier plate (61) and an insert rod (62) densely distributed on said carrier plate (61), said repairing agent layer (7) is wrapped on the outside of the carrier plate (61) and the insert rod (62), and said supporting skeleton (6) is made of degradable plant fiber.
6. The in-situ remediation blanket of riverbed bottom mud as claimed in claim 1 or 5, wherein the remediation agent layer (7) comprises EM (effective microorganism) strain, brown sugar, honey, agricultural sludge and clay, wherein the EM strain is 0.03-0.08% by weight, the brown sugar is 0.06-0.16% by weight, the honey is 0.015-0.04% by weight, the agricultural sludge is 15-30% by weight and the clay is the rest by weight.
7. The riverbed bottom mud in-situ remediation blanket as claimed in claim 1, 2 or 3, wherein the matrix layer (3) comprises EM strain, brown sugar, honey, curing agent, sepiolite, agricultural sludge, plant fiber and clay, wherein the EM strain accounts for 0.03-0.08% by weight, the brown sugar accounts for 0.06-0.16% by weight, the honey accounts for 0.015-0.04% by weight, the curing agent accounts for 1.0-2.5% by weight, the sepiolite accounts for 3-10% by weight, the agricultural sludge accounts for 5-12% by weight, the plant fiber accounts for 10-15% by weight and the clay accounts for the rest.
8. The in-situ riverbed bottom mud repairing blanket as claimed in claim 7, wherein the curing agent is one or more of calcium peroxide, calcium carbonate or calcium chloride.
9. The in-situ riverbed bottom mud restoration blanket according to claim 1 or 2, wherein the aquatic plant layer (2) is a mixed planting layer of emergent aquatic plants and submerged plants, and the vegetation area ratio of the emergent aquatic plants to the submerged plants is 1: 2-5.
10. The method for repairing the riverbed bottom sediment by the riverbed bottom sediment in-situ repairing blanket as claimed in claim 1, which is characterized by comprising the following steps:
s1, carrying out cofferdam segmentation separation on the treatment areas, respectively carrying out sewage interception treatment on the treatment sections, and then draining the treatment sections until a sludge layer at the bottom is exposed;
s2, manually cleaning garbage on the surface of the sludge layer, paving the riverbed bottom sludge in-situ restoration blanket on the surface of the sludge layer in the treatment section after cleaning, wherein for the non-closed treatment area, the paving direction of a channel (4) in the riverbed bottom sludge in-situ restoration blanket is consistent with the water flow direction, when the riverbed bottom sludge in-situ restoration blanket is paved, the bottom sludge restoration layer (1) is completely embedded into the sludge layer, and the substrate layer (3) is positioned above the sludge layer
S3, after the step S2 is completed, integrally fixing the riverbed bottom mud in-situ restoration blanket paved in the treatment section, paving and reinforcing by adopting a degradable plant fiber woven net with the same area as the treatment section, and fixing the edge of the plant fiber woven net by adopting a timber pile;
s4, paving and fixing the in-situ repair blanket of the river bed bottom mud of each treatment section, and flattening the cofferdam.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233726A (en) * | 2021-04-20 | 2021-08-10 | 江苏大学 | Sediment repair structure with purification effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113233726A (en) * | 2021-04-20 | 2021-08-10 | 江苏大学 | Sediment repair structure with purification effect |
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