Polluted river and lake ecological management system and method based on renewable utilization of building solid waste

Abstract

The invention discloses a polluted river and lake ecological management system and method based on renewable utilization of building solid waste. The polluted river and lake ecological management system comprises a primary filtering device and a layered ecological restoration device; the layered ecological restoration device comprises a plurality of levels of layered ecological restoration units which are connected in series, each layered ecological restoration unit comprises a drainage layer, a composite filter material cushion layer, a composite regeneration filler layer and an inverted filter vegetation layer, and the drainage layer is made of concrete construction waste recycled aggregate and / or brick construction waste recycled aggregate. The composite filter material cushion layer is formed by mixing concrete construction waste recycled aggregate, brick construction waste recycled aggregate and non-sintered clay-based functional aggregate, and the composite recycled filler layer is formed by mixing concrete construction waste recycled aggregate, brick construction waste recycled aggregate, non-sintered clay-based functional aggregate and modified paper mill dried sludge particles. According to the invention, the polluted river and lake water can be purified, and the building solid waste can be recycled.

Description

Technical Field

[0001] The present invention belongs to the technical field of recycling construction solid waste, and specifically relates to a system and method for ecological management of polluted rivers and lakes based on the recycling of construction solid waste. Background Art

[0002] At present, water environment pollution and water ecological degradation of rivers and lakes have become a realistic problem that needs to be solved urgently for sustainable development in China and even the world. In recent years, my country's major water systems have undergone comprehensive governance. Although initial results have been achieved, some water systems still have varying degrees of pollution. According to the 2022 "China Ecological Environment Bulletin", the proportion of Class I-III water quality sections in the country's surface water is 87.9%, and the proportion of Class V water quality sections is 0.7%. The main pollution indicators include chemical oxygen demand, permanganate index and total phosphorus. It can be seen that the overall pollution level of each polluted water system is still high. Traditional treatment methods, such as SBR method (sequencing batch activated sludge method), A / O method (anaerobic / aerobic process) and oxidation ditch process, generally have problems such as large land area, high investment, high operation and management costs, and the water quality and water volume of rivers and lakes are easily affected by external factors such as seasonal alternation and rainfall. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, the present invention provides a polluted river and lake ecological management system and method based on the renewable utilization of construction solid waste, which can utilize construction solid waste to construct a polluted river and lake ecological management system, realize the purification of polluted river and lake water, and realize the recycling of construction solid waste.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A polluted river and lake ecological management system based on the renewable utilization of construction solid waste, comprising a primary filtration device and a layered ecological restoration device arranged in sequence along the flow direction; the layered ecological restoration device comprises a plurality of layered ecological restoration units connected in series, the layered ecological restoration unit comprises a drainage layer, a composite filter material cushion layer, a composite recycled filler layer and a reverse filtration vegetation layer arranged in sequence from bottom to top, the polluted river and lake water in the layered ecological restoration unit flows from top to bottom, the drainage layer is made of recycled aggregates of concrete construction waste and / or recycled aggregates of brick construction waste, the composite filter material cushion layer is a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste and non-sintered clay-based functional aggregates, and the composite recycled filler layer is a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste, non-sintered clay-based functional aggregates and modified paper mill dried sludge particles.

[0006] Furthermore, the gradation range of the recycled aggregates from concrete construction waste and / or recycled aggregates from brick construction waste in the drainage layer is 4.75-16.5 mm; the gradation range of the recycled aggregates from concrete construction waste, recycled aggregates from brick construction waste and non-sintered clay-based functional aggregates in the composite filter material cushion layer is 2.36-9.5 mm; the gradation range of the recycled aggregates from concrete construction waste, recycled aggregates from brick construction waste, non-sintered clay-based functional aggregates and modified paper mill dried sludge particles in the composite recycled filler layer is 1.18-4.75 mm.

[0007] Furthermore, in the composite filter material cushion layer, the volume proportion of recycled aggregate from concrete construction waste is in the range of 35-40%, the volume proportion of recycled aggregate from brick construction waste is controlled at 36-55%, and the volume proportion of non-sintered clay-based functional aggregate is controlled at 8-25%.

[0008] Furthermore, in the composite recycled filler layer, the volume proportion of recycled aggregate from concrete construction waste is in the range of 15-30%, the volume proportion of recycled aggregate from brick construction waste is in the range of 30-45%, the volume proportion of non-sintered clay-based functional aggregate is in the range of 10-25%, and the volume proportion of modified paper mill dried sludge particles is in the range of 10-15%.

[0009] Furthermore, the thickness of the drainage layer ranges from 200 to 400 mm, the thickness of the composite filter material cushion layer ranges from 80 to 120 mm, the thickness of the composite regenerated filler layer ranges from 550 to 750 mm, and the thickness of the anti-filtration vegetation layer ranges from 40 to 60 mm.

[0010] Furthermore, the plants in the anti-filtration vegetation layer are submerged plants or floating plants, the submerged plants include black algae and / or Vallisneria, and the floating plants include Eichhornia crassipes and / or Nymphaea.

[0011] Furthermore, the composite filter material cushion layer and the composite regenerated filler layer are regenerated and reused through backwashing.

[0012] Furthermore, the non-sintered clay-based functional aggregate uses dried mud or engineering slag as a base material, and one or more components of aluminum hydroxide, aluminum chloride and aluminum silicate are added to the base material as additives. After the base material and the additives are evenly stirred, a certain amount of water is injected, and granulation treatment is carried out in a spheroidizing plate to form spherical particles, and the spherical particles are placed in a constant temperature and humidity curing box for curing for several days, and then dried to obtain the non-sintered clay-based functional aggregate, wherein the amount of additives added to the non-sintered clay-based functional aggregate is 3-8% of the dry weight of the base material.

[0013] Furthermore, the modified paper mill dried sludge particles use paper mill dried sludge as a base material, and one or more components of powdered branches, leaves and rice straw are added to the base material as additives to obtain the modified paper mill dried sludge particles, wherein the amount of the additive added to the modified paper mill dried sludge particles is 5-15% of the dry weight of the base material.

[0014] A method for ecological purification of polluted river and lake water, which adopts the above-mentioned polluted river and lake ecological management system based on the renewable utilization of construction solid waste for purification, and is characterized by: specifically: the polluted river and lake water is drained to the primary filtration device, the primary filtration device intercepts larger particles in the polluted river and lake water, the polluted river and lake water pre-treated by the primary filtration device enters the layered ecological restoration device, the polluted river and lake water flows from top to bottom in each level of the layered ecological restoration unit, the pollutants in the polluted river and lake water are purified in turn by the anti-filtration vegetation layer, the composite regeneration filler layer and the composite filter material cushion layer, and the purified river and lake water is discharged through the drainage layer.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The polluted river and lake ecological management system based on the renewable utilization of construction solid waste in the present invention includes a primary filtration device and a layered ecological restoration device arranged in sequence along the flow direction; the layered ecological restoration device includes several stages of layered ecological restoration units connected in series, the layered ecological restoration unit includes a drainage layer, a composite filter material cushion layer, a composite recycled filler layer and a reverse filtration vegetation layer arranged in sequence from bottom to top, the polluted river and lake water in the layered ecological restoration unit flows from top to bottom, the drainage layer is made of recycled aggregates of concrete construction waste and / or recycled aggregates of brick construction waste, the composite filter material cushion layer is a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste and non-sintered clay-based functional aggregates, and the composite recycled filler layer is a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste, non-sintered clay-based functional aggregates and modified paper mill dried sludge particles. In this way, when the polluted river and lake ecological management system based on the renewable utilization of construction solid waste is used to purify the polluted river and lake water, the polluted river and lake water is drained to the primary filtration device, the primary filtration device intercepts the larger particles in the polluted river and lake water, and the polluted river and lake water pre-treated by the primary filtration device enters the layered ecological restoration device, and the polluted river and lake water flows from top to bottom in each layered ecological restoration unit, and the pollutants in the polluted river and lake water are purified in turn by the anti-filtration vegetation layer, the composite regenerated filler layer and the composite filter material cushion layer, and the purified river and lake water is discharged through the drainage layer; the role of the anti-filtration vegetation layer is to prevent the surface of the composite regenerated filler layer from being washed away on the one hand, and on the other hand, the plants therein can absorb nutrients such as nitrogen and phosphorus in the polluted river and lake water through the root system, which has a good effect on water purification and the beauty of the surrounding environment; the composite regenerated filler layer is the core treatment layer for treating pollutants such as nitrogen and phosphorus, and the concrete construction waste recycled aggregate and brick The recycled aggregate from construction waste has a large specific surface area and can meet the attachment needs of microorganisms. The aluminum ions rich in the non-sintered clay-based functional aggregate can react chemically with the phosphorus in the polluted river and lake water to play a role in flocculation and precipitation. The modified paper mill dried sludge particles themselves contain more lignin fibers, organic matter, etc., which can provide nutrients for the initial attachment of microorganisms on the one hand, and on the other hand, as the lignin fibers, organic matter, etc. are degraded by microorganisms, the specific surface area of ​​the modified paper mill dried sludge particles can be increased, and a place for the growth of microorganisms can be provided. The microorganisms can degrade the organic matter in the polluted river and lake water to significantly reduce the chemical oxygen demand of the polluted river and lake water; the functions of the recycled aggregate from concrete construction waste, the recycled aggregate from brick construction waste and the non-sintered clay-based functional aggregate in the composite filter material cushion layer are consistent with those of the corresponding aggregates in the composite recycled filler layer, and can further purify the effluent from the composite recycled filler layer.

[0017] In summary, the present invention can utilize construction solid waste to construct an ecological management system for polluted rivers and lakes, achieve purification of polluted river and lake water, and realize the recycling of construction solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the ecological management system for polluted rivers and lakes based on the renewable utilization of construction solid waste in the present invention;

[0019] Figure 2 It is a schematic diagram of the structure for backwashing the composite filter material cushion layer and the composite regenerated filler layer.

[0020] Explanation of the reference numerals in the figure: 101, drainage layer, 102, composite filter material cushion layer, 103, composite regenerated filler layer, 104, anti-filtration vegetation layer, 105, ecological restoration box, 201, primary filter box, 202, coarse grid, 203, fine grid, 301, water inlet pipe, 302, water outlet pipe, 303, connecting water pipe, 304, drainage pipe. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0025] like Figure 1As shown, a polluted river and lake ecological management system based on the renewable utilization of construction solid waste includes a primary filtration device and a layered ecological restoration device arranged in sequence along the flow direction; the layered ecological restoration device includes a plurality of layered ecological restoration units connected in series, the layered ecological restoration units include a drainage layer 101, a composite filter material cushion layer 102, a composite recycled filler layer 103 and a reverse filtration vegetation layer 104 arranged in sequence from bottom to top, the polluted river and lake water in the layered ecological restoration unit flows from top to bottom, the drainage layer 101 is made of recycled aggregates of concrete construction waste and / or recycled aggregates of brick construction waste, the composite filter material cushion layer 102 is a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste and non-sintered clay-based functional aggregates, and the composite recycled filler layer 103 is a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste, non-sintered clay-based functional aggregates and modified paper mill dried sludge particles. The drainage layer 101 in the upstream layered ecological restoration unit is connected to the anti-filtration vegetation layer 104 in the downstream adjacent layered ecological restoration unit through a connecting water pipe 303. Figure 1 The layered ecological restoration device includes two levels of layered ecological restoration units connected in series.

[0026] In this way, when the polluted river and lake ecological management system based on the renewable utilization of construction solid waste is used to purify the polluted river and lake water, the polluted river and lake water is drained to the primary filtration device, the primary filtration device intercepts the larger particles in the polluted river and lake water, and the polluted river and lake water pre-treated by the primary filtration device enters the layered ecological restoration device. In each layered ecological restoration unit, the polluted river and lake water flows from top to bottom, and the pollutants in the polluted river and lake water are purified by the anti-filtration vegetation layer 104, the composite regenerated filler layer 103 and the composite filter material cushion layer 102 in turn, and the purified river and lake water is discharged through the drainage layer 101; the function of the anti-filtration vegetation layer 104 is to prevent the surface of the composite regenerated filler layer 103 from being washed away on the one hand, and on the other hand, the plants therein can absorb nutrients such as nitrogen and phosphorus in the polluted river and lake water through the root system, which has a good effect on water purification and the beauty of the surrounding environment; the composite regenerated filler layer 103 is the core treatment layer for treating pollutants such as nitrogen and phosphorus, and the concrete construction waste therein is recycled. Raw aggregate and brick-made construction waste recycled aggregate have a large specific surface area and can meet the attachment needs of microorganisms. The aluminum ions rich in the non-sintered clay-based functional aggregate can react chemically with the phosphorus element in the polluted river and lake water to play a role in flocculation and precipitation. The modified paper mill dried sludge particles themselves contain more lignin fibers, organic matter, etc., which can provide nutrients for the initial attachment of microorganisms on the one hand, and on the other hand, as the lignin fibers, organic matter, etc. are degraded by microorganisms, the specific surface area of ​​the modified paper mill dried sludge particles can be increased and a place for the growth of microorganisms can be provided. The microorganisms can degrade the organic matter in the polluted river and lake water to significantly reduce the chemical oxygen demand of the polluted river and lake water; the functions of the concrete construction waste recycled aggregate, the brick construction waste recycled aggregate and the non-sintered clay-based functional aggregate in the composite filter material cushion layer 102 are consistent with the functions of the corresponding aggregates in the composite recycled filler layer 103, and can further purify the effluent of the composite recycled filler layer 103.

[0027] Among them, the number of layered ecological restoration units is determined by the pollution degree and water quality requirements of the polluted rivers and lakes, and the cost can be controlled by oneself.

[0028] In summary, the present invention can utilize construction solid waste to construct an ecological management system for polluted rivers and lakes, achieve purification of polluted river and lake water, and realize the recycling of construction solid waste.

[0029] In one embodiment,

[0030] The gradation range of the recycled aggregates from concrete construction waste and / or recycled aggregates from brick construction waste in the drainage layer 101 is 4.75-16.5 mm; the gradation range of the recycled aggregates from concrete construction waste, recycled aggregates from brick construction waste and non-sintered clay-based functional aggregates in the composite filter material cushion layer 102 is 2.36-9.5 mm; the gradation range of the recycled aggregates from concrete construction waste, recycled aggregates from brick construction waste, non-sintered clay-based functional aggregates and modified paper mill dried sludge particles in the composite recycled filler layer 103 is 1.18-4.75 mm.

[0031] The volume ratio of the recycled aggregates from concrete construction waste in the composite filter material cushion layer 102 is 35-40%, the volume ratio of the recycled aggregates from brick construction waste is controlled at 36-55%, and the volume ratio of the non-sintered clay-based functional aggregate is controlled at 8-25%. The optimal volume ratio of the recycled aggregates from concrete construction waste, the recycled aggregates from brick construction waste and the non-sintered clay-based functional aggregate in the composite filter material cushion layer 102 is determined by the most compact packing curve of the aggregates.

[0032] Among them, the volume proportion of the recycled aggregate of concrete construction waste in the composite recycled filler layer 103 is in the range of 15-30%, the volume proportion of the recycled aggregate of brick construction waste is in the range of 30-45%, the volume proportion of the non-sintered clay-based functional aggregate is in the range of 10-25%, and the volume proportion of the modified paper mill dried sludge particles is in the range of 10-15%. Among them, the optimal volume ratio of the recycled aggregate of concrete construction waste, the recycled aggregate of brick construction waste, the non-sintered clay-based functional aggregate and the modified paper mill dried sludge particles in the composite recycled filler layer 103 is determined by the most compact packing curve of the aggregate. Among them, at room temperature of about 25°C, after the composite recycled filler layer 103 is flushed by polluted river and lake water for 4 days, a relatively rich microbial film is formed on the composite recycled filler layer 103.

[0033] Among them, the thickness range of the drainage layer 101 is 200-400 mm, the thickness range of the composite filter material cushion layer 102 is 80-120 mm, the thickness range of the composite recycled filler layer 103 is 550-750 mm, and the thickness range of the anti-filtration vegetation layer 104 is 40-60 mm.

[0034] In one embodiment, the plants in the filter vegetation layer 104 are submerged plants or floating plants, the submerged plants include hydrilla and / or Vallisneria, and the floating plants include Eichhornia crassipes and / or Nymphaea. Preferably, the planting density of submerged plants is 14 clumps / m2, and the planting density of floating plants is 12 clumps / m2.

[0035] In one embodiment, the composite filter material cushion layer 102 and the composite regenerated filler layer 103 are regenerated and reused by backwashing. Figure 2As shown, when it is necessary to backwash the composite filter material cushion layer 102 and the composite regenerated filler layer 103, stop draining the polluted river and lake water to the polluted river and lake ecological management system, and pump backwash water to the polluted river and lake ecological management system, wherein the flow direction of the backwash water is opposite to the flow direction of the polluted river and lake water. After backwashing, the inactivated microorganisms attached to the composite filter material cushion layer 102 and the composite regenerated filler layer 103 in each layered ecological restoration unit fall off, which makes it easier for new microorganisms to reattach and grow on the composite filter material cushion layer 102 and the composite regenerated filler layer 103, so as to realize the regeneration and reuse of the composite filter material cushion layer 102 and the composite regenerated filler layer 103, and improve the purification efficiency of polluted river and lake water.

[0036] In one embodiment, the non-sintered clay-based functional aggregate uses dried mud or engineering slag as a base material, and one or more components of aluminum hydroxide, aluminum chloride and aluminum silicate are added to the base material as additives. After the base material and the additives are evenly stirred, a certain amount of water is injected, and granulation is performed in a spheroidizing plate to form spherical particles, and the spherical particles are placed in a constant temperature and humidity curing box for curing for several days, and then dried to obtain non-sintered clay-based functional aggregate, wherein the amount of additives added to the non-sintered clay-based functional aggregate is 3-8% of the dry weight of the base material. The temperature in the constant temperature and humidity curing box is about 20°C, and the humidity is about 95%, wherein the curing is carried out in the constant temperature and humidity curing box for 7 days, and then taken out to dry.

[0037] In one embodiment, the modified paper mill dried sludge particles use paper mill dried sludge as the base material, and one or more components of powdered branches, leaves and rice straw are added to the base material as additives to obtain modified paper mill dried sludge particles, wherein the amount of the additive added to the modified paper mill dried sludge particles is 5-15% of the dry weight of the base material, preferably, the amount of the additive added to the modified paper mill dried sludge particles is 8-12% of the dry weight of the base material.

[0038] In one embodiment, the primary filter device includes a primary filter box 201, in which a group of coarse grids 202 and a group of fine grids 203 are sequentially arranged along the flow direction in the primary filter box 201, the upstream end of the primary filter box 201 is connected to an inlet pipe 301 and the downstream end is connected to an outlet pipe 302, wherein the polluted river and lake water needs to be drained to the inlet pipe 301, wherein the outlet pipe 302 is connected to the anti-filtration vegetation layer 104 in the layered ecological restoration unit on the most upstream side of the layered ecological restoration device, wherein the drainage layer 101 in the layered ecological restoration unit on the most downstream side of the layered ecological restoration device is connected to the drainage pipe 304. The coarse grid 202 and the fine grid 203 are both made of stainless steel, and the coarse grid 202 and the fine grid 203 are used to intercept larger particles in the polluted river and lake water, wherein the inlet pipe 301, the outlet pipe 302, the connecting water pipe 303 and the drainage pipe 304 are all PVC pipes.

[0039] In one embodiment, the drainage layer 101, the composite filter material cushion layer 102, the composite regenerated filler layer 103 and the anti-filtration vegetation layer 104 in each layered ecological restoration unit are arranged in sequence from bottom to top in an ecological restoration box 105 with an opening at the top.

[0040] A method for ecological purification of polluted river and lake water, which adopts the above-mentioned polluted river and lake ecological management system based on the renewable utilization of construction solid waste for purification, and is characterized by: specifically: the polluted river and lake water is drained to a primary filtration device, the primary filtration device intercepts larger particles in the polluted river and lake water, the polluted river and lake water pre-treated by the primary filtration device enters a layered ecological restoration device, and the polluted river and lake water flows from top to bottom in each layered ecological restoration unit. The pollutants in the polluted river and lake water are purified in turn by a reverse filtration vegetation layer 104, a composite regenerated filler layer 103 and a composite filter material cushion layer 102, and the purified river and lake water is discharged through a drainage layer 101. After the purified river and lake water is discharged, a part of the water can be used as other landscape water or toilet flushing, and most of the water can be discharged back into the original water body.

[0041] The present invention realizes the complete waste disposal of raw materials in the layered ecological restoration unit, and has the characteristics of high disposal efficiency, controllable cost, and environmental protection, providing a model case for the ecological management of polluted rivers and lakes.

[0042] Example 1

[0043] A polluted river and lake ecological management system based on the renewable utilization of construction solid waste, comprising a primary filtration device and a layered ecological restoration device arranged in sequence along the flow direction, wherein the layered ecological restoration device comprises three-level layered ecological restoration units, and each level of the layered ecological restoration unit comprises a drainage layer 101, a composite filter material cushion layer 102, a composite recycled filler layer 103 and a reverse filtration vegetation layer 104 arranged in sequence from bottom to top, the drainage layer 101 is made of recycled aggregate from concrete construction waste, the composite filter material cushion layer 102 is a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste and non-sintered clay-based functional aggregate, the composite recycled filler layer 103 is a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste, non-sintered clay-based functional aggregate and modified paper mill dried sludge particles, and the plants in the reverse filtration vegetation layer 104 are black algae.

[0044] Among them, the gradation range of the recycled aggregate from concrete construction waste in the drainage layer 101 is 4.75-16.5mm, and the thickness of the drainage layer 101 is 300mm; among them, in the drainage layer 101, the mass ratio of the recycled aggregate from concrete construction waste in the two gradation ranges of 4.75-9.5mm and 9.5-16.5mm is 35%:65%.

[0045] The grading range of the recycled aggregate of concrete construction waste, the recycled aggregate of brick construction waste and the non-sintered clay-based functional aggregate in the composite filter material cushion layer 102 is 2.36-9.5 mm, and the thickness of the composite filter material cushion layer 102 is 100 mm; the volume of the recycled aggregate of concrete construction waste, the volume of the recycled aggregate of brick construction waste and the volume of the non-sintered clay-based functional aggregate account for 35% and 45% respectively in the composite filter material cushion layer 102, and the volume of the recycled aggregate of brick construction waste accounts for 20% and 20% respectively in the composite filter material cushion layer 102. In the cushion layer 102, the mass ratio of the recycled aggregates of concrete construction waste in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 60%:40%, the mass ratio of the recycled aggregates of brick construction waste in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 60%:40%, and the mass ratio of the non-sintered clay-based functional aggregates in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 70%:30%.

[0046] Among them, the gradation range of the recycled aggregate of concrete construction waste, the recycled aggregate of brick construction waste, the non-sintered clay-based functional aggregate and the modified paper mill dried sludge particles in the composite recycled filler layer 103 is 1.18-4.75mm, and the thickness of the composite recycled filler layer 103 is 700mm; among them, in the composite recycled filler layer 103, the volume proportion of the recycled aggregate of concrete construction waste is 30%, the volume proportion of the recycled aggregate of brick construction waste is 30%, the volume proportion of the non-sintered clay-based functional aggregate is 25%, and the volume proportion of the modified paper mill dried sludge particles is 15%; among them, in the composite recycled filler layer 103, 1.1 The mass ratio of recycled aggregate from concrete construction waste in the two gradation ranges of 8-2.36mm and 2.36-4.75mm is 50%:50%, the mass ratio of recycled aggregate from brick construction waste in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 60%:40%, the mass ratio of non-sintered clay-based functional aggregate in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 65%:35%, and the mass ratio of modified paper mill dried sludge particles in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 65%:35%.

[0047] The planting density of black algae in the anti-filtration vegetation layer 104 is 14 clumps / square meter, and the thickness of the anti-filtration vegetation layer 104 is 60 mm.

[0048] Among them, the non-sintered clay-based functional aggregate uses dried mud as the base material, and aluminum hydroxide is added to the base material as an additive. After the base material and the additive are evenly stirred, a certain amount of water is injected, and granulation treatment is carried out in a ball-forming tray to form spherical particles. The spherical particles are placed in a constant temperature and humidity curing box for curing for 7 days, and then dried to obtain non-sintered clay-based functional aggregate. In the non-sintered clay-based functional aggregate, the amount of aluminum hydroxide added is 5% of the dry weight of the base material.

[0049] Among them, the modified paper mill dried sludge particles use paper mill dried sludge as a base material, and powdered rice straw is added to the base material as an additive to obtain the modified paper mill dried sludge particles, wherein the amount of rice straw added to the modified paper mill dried sludge particles is 10% of the dry weight of the base material.

[0050] The polluted river and lake ecological management system based on the renewable utilization of construction solid waste in Example 1 was used to purify the polluted river and lake water of Level III pollution. After treatment by the three-level layered ecological restoration unit, the treatment effect of the polluted river and lake water is shown in Table 1.

[0051] Table 1

[0052]

[0053] It can be seen from Table 1 that after the polluted river and lake water of Level III pollution is treated by the three-level layered ecological restoration unit, the chemical oxygen demand effluent concentration in the effluent water quality reaches the Level I water quality requirements, and the total phosphorus effluent concentration reaches the Level II water quality requirements.

[0054] Example 2

[0055] A polluted river and lake ecological management system based on the renewable utilization of construction solid waste, comprising a primary filtration device and a layered ecological restoration device arranged in sequence along the flow direction, wherein the layered ecological restoration device comprises three-level layered ecological restoration units, and each level of the layered ecological restoration unit comprises a drainage layer 101, a composite filter material cushion layer 102, a composite recycled filler layer 103 and a reverse filtration vegetation layer 104 arranged in sequence from bottom to top, the drainage layer 101 is formed by a mixture of recycled aggregates of concrete construction waste and recycled aggregates of brick construction waste, the composite filter material cushion layer 102 is formed by a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste and non-sintered clay-based functional aggregates, the composite recycled filler layer 103 is formed by a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste, non-sintered clay-based functional aggregates and modified paper mill dried sludge particles, and the plants in the reverse filtration vegetation layer 104 are black algae.

[0056] Among them, the gradation range of the recycled aggregate of concrete construction waste in the drainage layer 101 is 4.75-16.5mm, and the thickness of the drainage layer 101 is 300mm; among them, in the drainage layer 101, the mass ratio of the recycled aggregate of concrete construction waste in the two gradation ranges of 4.75-9.5mm and 9.5-16.5mm is 40%:60%, and the mass ratio of the recycled aggregate of brick construction waste in the two gradation ranges of 4.75-9.5mm and 9.5-16.5mm is 40%:60%.

[0057] The grading range of the recycled aggregate of concrete construction waste, the recycled aggregate of brick construction waste and the non-sintered clay-based functional aggregate in the composite filter material cushion layer 102 is 2.36-9.5 mm, and the thickness of the composite filter material cushion layer 102 is 120 mm; the volume of the recycled aggregate of concrete construction waste, the volume of the recycled aggregate of brick construction waste and the volume of the non-sintered clay-based functional aggregate account for 35% and 50% respectively in the composite filter material cushion layer 102, and the volume of the recycled aggregate of brick construction waste accounts for 15% and 15% respectively in the composite filter material cushion layer 102. In the cushion layer 102, the mass ratio of the recycled aggregates of concrete construction waste in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 65%:35%, the mass ratio of the recycled aggregates of brick construction waste in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 50%:50%, and the mass ratio of the non-sintered clay-based functional aggregates in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 75%:25%.

[0058] Among them, the gradation range of the concrete construction waste recycled aggregate, brick construction waste recycled aggregate, non-sintered clay-based functional aggregate and modified paper mill dried sludge particles in the composite recycled filler layer 103 is 1.18-4.75mm, and the thickness of the composite recycled filler layer 103 is 750mm; among them, in the composite recycled filler layer 103, the volume proportion of the concrete construction waste recycled aggregate is 20%, the volume proportion of the brick construction waste recycled aggregate is 45%, the volume proportion of the non-sintered clay-based functional aggregate is 20%, and the volume proportion of the modified paper mill dried sludge particles is 15%; among them, in the composite recycled filler layer 103, 1.1 The mass ratio of recycled aggregate from concrete construction waste in the two gradation ranges of 8-2.36mm and 2.36-4.75mm is 55%:45%, the mass ratio of recycled aggregate from brick construction waste in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 50%:50%, the mass ratio of non-sintered clay-based functional aggregate in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 60%:40%, and the mass ratio of modified paper mill dried sludge particles in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 60%:40%.

[0059] The planting density of black algae in the anti-filtration vegetation layer 104 is 14 clumps / square meter, and the thickness of the anti-filtration vegetation layer 104 is 60 mm.

[0060] Among them, the non-sintered clay-based functional aggregate uses dried mud as the base material, and aluminum hydroxide and aluminum chloride are added to the base material as additives. After the base material and the additives are evenly stirred, a certain amount of water is injected, and granulation is carried out in a ball-forming tray to form spherical particles. The spherical particles are placed in a constant temperature and humidity curing box for curing for 7 days, and then dried to obtain non-sintered clay-based functional aggregate. In the non-sintered clay-based functional aggregate, the addition amount of aluminum hydroxide is 5% of the dry weight of the base material, and the addition amount of aluminum chloride is 3% of the dry weight of the base material.

[0061] Among them, the modified paper mill dried sludge particles use paper mill dried sludge as the base material, and powdered tree branches are added to the base material as additives to obtain the modified paper mill dried sludge particles, wherein in the modified paper mill dried sludge particles, the amount of tree branches added is 15% of the dry weight of the base material.

[0062] The polluted river and lake ecological management system based on the renewable utilization of construction solid waste in Example 2 was used to purify the polluted river and lake water of Level III pollution. After treatment by the three-level layered ecological restoration unit, the treatment effect of the polluted river and lake water is shown in Table 2.

[0063] Table 2

[0064]

[0065] It can be seen from Table 2 that after the polluted river and lake water of Level III pollution is treated by the three-level layered ecological restoration unit, the chemical oxygen demand effluent concentration in the effluent water quality reaches the Level I water quality requirements, and the total phosphorus effluent concentration reaches the Level II water quality requirements.

[0066] Example 3

[0067] A polluted river and lake ecological management system based on the renewable utilization of construction solid waste, comprising a primary filtration device and a layered ecological restoration device arranged in sequence along the flow direction, wherein the layered ecological restoration device comprises two-level layered ecological restoration units, and each level of the layered ecological restoration unit comprises a drainage layer 101, a composite filter material cushion layer 102, a composite recycled filler layer 103 and a reverse filtration vegetation layer 104 arranged in sequence from bottom to top, the drainage layer 101 is made of recycled aggregate from brick construction waste, the composite filter material cushion layer 102 is a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste and non-sintered clay-based functional aggregate, the composite recycled filler layer 103 is a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste, non-sintered clay-based functional aggregate and modified paper mill dried sludge particles, and the plant in the reverse filtration vegetation layer 104 is water hyacinth.

[0068] Among them, the gradation range of the recycled aggregate from concrete construction waste in the drainage layer 101 is 4.75-16.5mm, and the thickness of the drainage layer 101 is 300mm; among them, in the drainage layer 101, the mass ratio of the recycled aggregate from brick construction waste in the two gradation ranges of 4.75-9.5mm and 9.5-16.5mm is 40%:60%.

[0069] The grading range of the recycled aggregate of concrete construction waste, the recycled aggregate of brick construction waste and the non-sintered clay-based functional aggregate in the composite filter material cushion layer 102 is 2.36-9.5 mm, and the thickness of the composite filter material cushion layer 102 is 120 mm; the volume of the recycled aggregate of concrete construction waste, the volume of the recycled aggregate of brick construction waste and the volume of the non-sintered clay-based functional aggregate account for 40% in the composite filter material cushion layer 102, the volume of the recycled aggregate of brick construction waste account for 52%, and the volume of the non-sintered clay-based functional aggregate account for 8%; In the cushion layer 102, the mass ratio of the recycled aggregates of concrete construction waste in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 65%:35%, the mass ratio of the recycled aggregates of brick construction waste in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 50%:50%, and the mass ratio of the non-sintered clay-based functional aggregates in the two gradation ranges of 2.36-4.75mm and 4.75-9.5mm is 75%:25%.

[0070] Among them, the gradation range of the concrete construction waste recycled aggregate, brick construction waste recycled aggregate, non-sintered clay-based functional aggregate and modified paper mill dried sludge particles in the composite recycled filler layer 103 is 1.18-4.75mm, and the thickness of the composite recycled filler layer 103 is 750mm; among them, in the composite recycled filler layer 103, the volume proportion of the concrete construction waste recycled aggregate is 30%, the volume proportion of the brick construction waste recycled aggregate is 45%, the volume proportion of the non-sintered clay-based functional aggregate is 15%, and the volume proportion of the modified paper mill dried sludge particles is 10%; among them, in the composite recycled filler layer 103, 1.1 The mass ratio of recycled aggregate from concrete construction waste in the two gradation ranges of 8-2.36mm and 2.36-4.75mm is 55%:45%, the mass ratio of recycled aggregate from brick construction waste in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 50%:50%, the mass ratio of non-sintered clay-based functional aggregate in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 60%:40%, and the mass ratio of modified paper mill dried sludge particles in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 60%:40%.

[0071] The planting density of water hyacinth in the anti-filtration vegetation layer 104 is 12 clumps / square meter, and the thickness of the anti-filtration vegetation layer 104 is 60 mm.

[0072] Among them, the non-sintered clay-based functional aggregate uses dried mud as the base material, and aluminum hydroxide and aluminum chloride are added to the base material as additives. After the base material and the additives are evenly stirred, a certain amount of water is injected, and granulation is carried out in a ball-forming tray to form spherical particles. The spherical particles are placed in a constant temperature and humidity curing box for curing for 7 days, and then dried to obtain non-sintered clay-based functional aggregate. In the non-sintered clay-based functional aggregate, the addition amount of aluminum hydroxide is 5% of the dry weight of the base material, and the addition amount of aluminum chloride is 3% of the dry weight of the base material.

[0073] Among them, the modified paper mill dried sludge particles use paper mill dried sludge as the base material, and powdered tree branches are added to the base material as additives to obtain the modified paper mill dried sludge particles, wherein in the modified paper mill dried sludge particles, the amount of tree branches added is 15% of the dry weight of the base material.

[0074] The polluted river and lake ecological management system based on the renewable utilization of construction solid waste in Example 3 was used to purify the polluted river and lake water of Level II pollution. After treatment by the two-stage layered ecological restoration unit, the treatment effect of the polluted river and lake water is shown in Table 3.

[0075] Table 3

[0076]

[0077] It can be seen from Table 3 that after the polluted river and lake water of Level II pollution was treated by the two-level layered ecological restoration unit, the chemical oxygen demand removal rate in the effluent water quality was (14.6-8.5) / 14.6=41.8%, and the total phosphorus removal rate in the effluent water quality was (0.4-0.25) / 0.4=37.5%.

[0078] In summary, the polluted river and lake ecological management system based on the renewable utilization of construction solid waste in the present invention can effectively remove inorganic eutrophic elements such as nitrogen and phosphorus in the polluted river and lake water, and can effectively remove organic pollutants in the polluted river and lake water to reduce the chemical oxygen demand and five-day biochemical oxygen demand in the effluent water quality.

[0079] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A polluted river and lake ecological management system based on the renewable utilization of construction solid waste, characterized by: The invention comprises a primary filtration device and a layered ecological restoration device which are sequentially arranged along the flow direction; the layered ecological restoration device comprises a plurality of layered ecological restoration units which are serially connected, the layered ecological restoration units comprising a drainage layer (101), a composite filter material cushion layer (102), a composite recycled filler layer (103) and a reverse filtration vegetation layer (104) which are sequentially arranged from bottom to top, the polluted river and lake water in the layered ecological restoration unit flows from top to bottom, the drainage layer (101) is made of recycled aggregates of concrete construction waste and / or recycled aggregates of brick construction waste, the composite filter material cushion layer (102) is made of a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste and non-sintered clay-based functional aggregates, and the composite recycled filler layer (103) is made of a mixture of recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste, non-sintered clay-based functional aggregates and modified dried sludge particles from a paper mill.

2. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 1 is characterized by: The gradation range of the recycled aggregates of concrete construction waste and / or recycled aggregates of brick construction waste in the drainage layer (101) is 4.75-16.5 mm; the gradation range of the recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste and non-sintered clay-based functional aggregates in the composite filter material cushion layer (102) is 2.36-9.5 mm; the gradation range of the recycled aggregates of concrete construction waste, recycled aggregates of brick construction waste, non-sintered clay-based functional aggregates and modified paper mill dried sludge particles in the composite recycled filler layer (103) is 1.18-4.75 mm.

3. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 2 is characterized by: The volume proportion of the recycled aggregate from concrete construction waste in the composite filter material cushion layer (102) is in the range of 35-40%, the volume proportion of the recycled aggregate from brick construction waste is controlled at 36-55%, and the volume proportion of the non-sintered clay-based functional aggregate is controlled at 8-25%.

4. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 2 is characterized by: The volume proportion of the recycled aggregate from concrete construction waste in the composite recycled filler layer (103) is in the range of 15-30%, the volume proportion of the recycled aggregate from brick construction waste is in the range of 30-45%, the volume proportion of the non-sintered clay-based functional aggregate is in the range of 10-25%, and the volume proportion of the modified paper mill dried sludge particles is in the range of 10-15%.

5. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 2 is characterized by: The thickness of the drainage layer (101) is in the range of 200-400 mm, the thickness of the composite filter material cushion layer (102) is in the range of 80-120 mm, the thickness of the composite regenerated filler layer (103) is in the range of 550-750 mm, and the thickness of the anti-filtration vegetation layer (104) is in the range of 40-60 mm.

6. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 1 is characterized by: The plants in the anti-filtration vegetation layer (104) are submerged plants or floating plants. The submerged plants include hydrilla and / or Vallisneria, and the floating plants include Eichhornia crassipes and / or Nymphaea.

7. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 1 is characterized by: The composite filter material cushion layer (102) and the composite regenerated filler layer (103) are regenerated and reused through backwashing.

8. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 1 is characterized by: The non-sintered clay-based functional aggregate uses dried mud or engineering slag as a base material, and one or more components of aluminum hydroxide, aluminum chloride and aluminum silicate are added to the base material as additives. After the base material and the additives are evenly stirred, a certain amount of water is injected, and granulation treatment is carried out in a spheroidizing plate to form spherical particles. The spherical particles are placed in a constant temperature and humidity curing box for curing for several days, and then dried to obtain the non-sintered clay-based functional aggregate, wherein the amount of the additive added in the non-sintered clay-based functional aggregate is 3-8% of the dry weight of the base material.

9. The polluted river and lake ecological management system based on the renewable utilization of construction solid waste according to claim 1 is characterized by: The modified paper mill dried sludge particles use paper mill dried sludge as a base material, and one or more components of pulverized branches, leaves and rice straw are added to the base material as additives to obtain the modified paper mill dried sludge particles, wherein the amount of the additive added to the modified paper mill dried sludge particles is 5-15% of the dry weight of the base material.

10. A method for ecological purification of polluted river and lake water, using the polluted river and lake ecological management system based on the renewable utilization of construction solid waste as described in any one of claims 1 to 9 for purification, characterized in that: Specifically, the polluted river and lake water is drained to the primary filtration device, the primary filtration device intercepts larger particles in the polluted river and lake water, the polluted river and lake water pre-treated by the primary filtration device enters the layered ecological restoration device, the polluted river and lake water flows from top to bottom in each layered ecological restoration unit, the pollutants in the polluted river and lake water are purified by the anti-filtration vegetation layer (104), the composite regeneration filler layer (103) and the composite filter material cushion layer (102) in turn, and the purified river and lake water is discharged through the drainage layer (101).

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