Ecological management system and method for polluted river and lake based on renewable utilization of building solid waste

Abstract

The application discloses a pollution river and lake ecological management system and method based on renewable utilization of building solid wastes, and relates to the field of ecological management of polluted rivers and lakes.The pollution river and lake ecological management system comprises a primary filter device and a layered ecological restoration device.The layered ecological restoration device comprises a plurality of layered ecological restoration units connected in series, and each layered ecological restoration unit comprises a drainage layer, a composite filter material cushion layer, a composite renewable filler layer and a reverse filtration plant layer.The drainage layer is made of concrete building waste renewable aggregates and / or brick building waste renewable aggregates.The composite filter material cushion layer is made by mixing concrete building waste renewable aggregates, brick building waste renewable aggregates and non-sintered clay-based functional aggregates.The composite renewable filler layer is made by mixing concrete building waste renewable aggregates, brick building waste renewable aggregates, non-sintered clay-based functional aggregates and modified paper mill dry sludge particles.The application can realize purification treatment of polluted river and lake water and renewable utilization of building solid wastes.

Description

Technical Field

[0001] This invention belongs to the field of construction solid waste recycling technology, specifically relating to a pollution river and lake ecological governance system and method based on the recyclability of construction solid waste. Background Technology

[0002] Currently, water pollution and aquatic ecosystem degradation in rivers and lakes have become pressing challenges for sustainable development in China and globally. While comprehensive treatment efforts in recent years have yielded initial results, some water systems still suffer from varying degrees of pollution. According to the 2022 "China Ecological Environment Status Bulletin," 87.9% of surface water sections nationwide were classified as Class I-III, and 0.7% were classified as Class V or worse. Major pollutants included chemical oxygen demand (COD), permanganate index, and total phosphorus. This indicates that the overall pollution level of various water systems remains high. Traditional treatment methods, such as the SBR (Sequencing Batch Reactor), A / O (Anaerobic / Aerobic) process, and oxidation ditch processes, generally suffer from problems such as large land area requirements, high investment costs, and high operating and management expenses. Furthermore, the quality and quantity of river and lake water are easily affected by external factors such as seasonal changes and rainfall. Summary of the Invention

[0003] In view of the above-mentioned deficiencies of the prior art, the present invention provides a system and method for ecological governance of polluted rivers and lakes based on the recyclability of construction solid waste. It can use construction solid waste to construct an ecological governance system for polluted rivers and lakes, realize the purification treatment of polluted river and lake water, and realize the recycling of construction solid waste.

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

[0005] A pollution river and lake ecological remediation system based on the recyclability of construction solid waste includes a primary filtration device and a layered ecological restoration device arranged sequentially along the flow direction. The layered ecological restoration device includes several layers of layered ecological restoration units connected in series. Each layered ecological restoration unit includes a drainage layer, a composite filter media layer, a composite recycled filler layer, and a reverse filter vegetation layer arranged sequentially 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 aggregate from concrete construction waste and / or recycled aggregate from brick construction waste. The composite filter media layer 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 is a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste, non-sintered clay-based functional aggregate, and modified dried sludge particles from a paper mill.

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

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

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

[0009] Furthermore, the thickness of the drainage layer ranges from 200 to 400 mm, the thickness of the composite filter pad 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 reverse filter vegetation layer ranges from 40 to 60 mm.

[0010] Furthermore, the plants in the reverse filter vegetation layer are submerged or floating plants, the submerged plants include Hydrilla verticillata and / or Vallisneria natans, and the floating plants include Water hyacinth and / or Water lily.

[0011] Furthermore, the composite filter media layer and the composite regenerated packing layer can be regenerated and reused through backwashing.

[0012] Furthermore, the non-sintered clay-based functional aggregate uses dried mud or engineering waste as the base material, and adds one or more components of aluminum hydroxide, aluminum chloride and aluminum silicate as additives to the base material. After the base material and additives are mixed evenly, a certain amount of water is injected, and granulation is carried out in a pelletizing pan to form spherical particles. The spherical particles are then placed in a constant temperature and humidity curing chamber for several days and then dried to obtain the non-sintered clay-based functional aggregate. 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 granules use paper mill dried sludge as the base material, and add one or more components from pulverized branches, leaves and rice straw as additives to the base material to obtain the modified paper mill dried sludge granules, wherein the amount of additives added to the modified paper mill dried sludge granules is 5-15% of the dry weight of the base material.

[0014] An ecological purification method for polluted river and lake water employs the aforementioned ecological governance system for polluted rivers and lakes based on the recyclability of construction solid waste. The method is characterized by: diverting the polluted river and lake water to the primary filtration device, which traps larger particles in the polluted water; the pre-treated polluted water then enters a layered ecological restoration device; in each layered ecological restoration unit, the polluted water flows from top to bottom, and the pollutants in the water sequentially pass through the reverse filtration vegetation layer, the composite regenerated filler layer, and the composite filter pad layer for purification; the purified water is then discharged through the drainage layer.

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

[0016] The pollution river and lake ecological treatment system based on the recyclability of construction solid waste in this invention includes a primary filtration device and a layered ecological restoration device arranged sequentially along the flow direction. The layered ecological restoration device includes several layers of layered ecological restoration units connected in series. Each layered ecological restoration unit includes a drainage layer, a composite filter pad layer, a composite recycled filler layer, and a reverse filter vegetation layer arranged sequentially 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 aggregate from concrete construction waste and / or recycled aggregate from brick construction waste. The composite filter pad layer 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 is a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste, non-sintered clay-based functional aggregate, and modified dried sludge particles from a paper mill. When using the above-mentioned ecological remediation system for polluted rivers and lakes based on the recycling of construction solid waste to purify polluted river and lake water, the polluted river and lake water is diverted 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 the layered ecological restoration device. In each layered ecological restoration unit, the polluted river and lake water flows from top to bottom. The pollutants in the polluted river and lake water are purified sequentially through a reverse filtration vegetation layer, a composite regenerated filler layer, and a composite filter pad layer. The purified river and lake water is discharged through a drainage layer. The reverse filtration vegetation layer serves two purposes: firstly, it prevents the surface of the composite regenerated filler layer from being washed away; secondly, the plants in it can absorb nutrients such as nitrogen and phosphorus from the polluted river and lake water through their roots, which has a good effect on water purification and the aesthetics of the surrounding environment. The composite regenerated filler layer is the core treatment layer for treating pollutants such as nitrogen and phosphorus. The composite regenerated filler layer contains recycled aggregates from concrete construction waste and bricks. The recycled aggregate from construction waste has a large specific surface area, which meets the attachment requirements of microorganisms. The aluminum ions in the non-sintered clay-based functional aggregate can react chemically with phosphorus in polluted rivers and lakes, playing a role in flocculation and sedimentation. The modified dried sludge particles from paper mills contain a lot of lignin fiber and organic matter, which can provide nutrients for the initial attachment of microorganisms. On the other hand, as the lignin fiber and organic matter are degraded by microorganisms, the specific surface area of ​​the modified dried sludge particles from paper mills can be increased, providing a place for microbial growth. Microorganisms can then degrade organic matter in polluted rivers and lakes, thereby significantly reducing the chemical oxygen demand of polluted rivers and lakes. The concrete recycled aggregate from construction waste, brick recycled aggregate from construction waste, and non-sintered clay-based functional aggregate in the composite filter media layer have the same function as the corresponding aggregates in the composite recycled filler layer, which can further purify the effluent from the composite recycled filler layer.

[0017] In summary, this invention can utilize construction solid waste to construct an ecological governance system for polluted rivers and lakes, thereby purifying polluted river and lake water and enabling the recycling of construction solid waste. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the polluted river and lake ecological governance system based on the recyclability of construction solid waste in this invention;

[0019] Figure 2 This is a schematic diagram of the structure for backwashing the composite filter media pad layer and the composite regenerated packing layer.

[0020] The following are the labels in the attached diagram: 101, Drainage layer; 102, Composite filter media pad layer; 103, Composite regenerated filler layer; 104, Reverse filter vegetation layer; 105, Ecological restoration box; 201, Primary filter box; 202, Coarse screen; 203, Fine screen; 301, Inlet pipe; 302, Outlet pipe; 303, Connecting water pipe; 304, Drainage pipe. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] like Figure 1As shown, a polluted river and lake ecological restoration system based on the recyclability of construction solid waste includes a primary filtration device and a layered ecological restoration device arranged sequentially along the flow direction. The layered ecological restoration device includes several layers of layered ecological restoration units connected in series. Each layered ecological restoration unit includes a drainage layer 101, a composite filter media layer 102, a composite recycled filler layer 103, and a reverse filter vegetation layer 104 arranged sequentially 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 aggregate from concrete construction waste and / or recycled aggregate from brick construction waste. The composite filter media 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 dried sludge particles from a paper mill. The drainage layer 101 in the upstream layered ecological restoration unit is connected to the filter vegetation layer 104 in the adjacent downstream layered ecological restoration unit via a connecting water pipe 303. Figure 1 The layered ecological restoration device in the system consists of two levels of layered ecological restoration units connected in series.

[0026] When using the above-mentioned ecological remediation system for polluted rivers and lakes based on the recyclability of construction solid waste to purify polluted river and lake water, the polluted river and lake water is diverted to a primary filtration device. The primary filtration device intercepts larger particles in the polluted river and lake water. After pretreatment by the primary filtration device, the polluted river and lake water enters the layered ecological restoration device. In each layered ecological restoration unit, the polluted river and lake water flows from top to bottom. The pollutants in the polluted river and lake water are purified sequentially through a reverse-filtration vegetation layer 104, a composite regenerated filler layer 103, and a composite filter pad layer 102. The purified river and lake water is discharged through a drainage layer 101. The reverse-filtration vegetation layer 104 serves two purposes: firstly, it prevents the surface of the composite regenerated filler layer 103 from being washed away; secondly, the plants in it can absorb nutrients such as nitrogen and phosphorus from the polluted river and lake water through their roots, which has a good effect on water purification and the aesthetics of the surrounding environment. The composite regenerated filler layer 103 is the core treatment layer for treating pollutants such as nitrogen and phosphorus. The concrete construction waste in it is recycled... Raw aggregate and recycled aggregate from brick construction waste have a large specific surface area, which can meet the attachment requirements of microorganisms. The aluminum ions in the non-sintered clay-based functional aggregate can react chemically with phosphorus in polluted rivers and lakes, playing a role in flocculation and sedimentation. The modified paper mill dried sludge particles contain a lot of lignin fiber and organic matter, which can provide nutrients for the initial attachment of microorganisms. On the other hand, as the lignin fiber and organic matter are degraded by microorganisms, the specific surface area of ​​the modified paper mill dried sludge particles can be increased, providing a place for microbial growth. Microorganisms can then degrade organic matter in polluted rivers and lakes, thereby significantly reducing the chemical oxygen demand of polluted rivers and lakes. The functions of the concrete-based recycled aggregate from brick construction waste, recycled aggregate from brick construction waste, and non-sintered clay-based functional aggregate in the composite filter media layer 102 are the same as those of the corresponding aggregates in the composite recycled filler layer 103, which can further purify the effluent from the composite recycled filler layer 103.

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

[0028] In summary, this invention can utilize construction solid waste to construct an ecological governance system for polluted rivers and lakes, thereby purifying polluted river and lake water and enabling the recycling of construction solid waste.

[0029] In one embodiment,

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

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

[0032] In the composite recycled filler layer 103, the volume percentage of recycled aggregate from concrete construction waste ranges from 15-30%, the volume percentage of recycled aggregate from brick construction waste ranges from 30-45%, the volume percentage of non-sintered clay-based functional aggregate ranges from 10-25%, and the volume percentage of modified dried sludge particles from paper mills ranges from 10-15%. The optimal volume ratio of the recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste, non-sintered clay-based functional aggregate, and modified dried sludge particles from paper mills in the composite recycled filler layer 103 is determined by the closest packing curve of the aggregates. Furthermore, after being washed by polluted river or lake water for 4 days at approximately 25°C, a relatively rich microbial film forms on the composite recycled filler layer 103.

[0033] The thickness of the drainage layer 101 ranges from 200 to 400 mm, the thickness of the composite filter pad layer 102 ranges from 80 to 120 mm, the thickness of the composite regenerated filler layer 103 ranges from 550 to 750 mm, and the thickness of the reverse filter vegetation layer 104 ranges from 40 to 60 mm.

[0034] In one embodiment, the plants in the reverse filter vegetation layer 104 are submerged or floating plants. Submerged plants include *Hydrilla verticillata* and / or *Vallisneria natans*, while floating plants include *Water hyacinth* and / or water lilies. 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 media pad 102 and the composite regenerated packing layer 103 are regenerated and reused through backwashing. Specifically, as shown... Figure 2As shown, when backwashing of the composite filter media layer 102 and the composite regenerated filler layer 103 is required, the diversion of polluted river and lake water to this polluted river and lake ecological treatment system is stopped, and backwash water is pumped into this polluted river and lake ecological treatment system. The flow direction of the backwash water is opposite to the flow direction of the polluted river and lake water. After backwashing, the inactive microorganisms attached to the composite filter media layer 102 and the composite regenerated filler layer 103 in each layered ecological restoration unit fall off, which facilitates the reattachment and growth of new microorganisms on the composite filter media layer 102 and the composite regenerated filler layer 103, so as to realize the regeneration and reuse of the composite filter media layer 102 and the composite regenerated filler layer 103 and improve the purification efficiency of the polluted river and lake water.

[0036] In one embodiment, the non-sintered clay-based functional aggregate uses dried mud or engineering waste as the base material. One or more components selected from aluminum hydroxide, aluminum chloride, and aluminum silicate are added to the base material as additives. After the base material and additives are mixed evenly, a certain amount of water is added, and granulation is performed in a pelletizing pan to form spherical particles. The spherical particles are then placed in a constant temperature and humidity curing chamber for several days and then dried to obtain the non-sintered clay-based functional aggregate. 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 chamber is about 20°C, and the humidity is about 95%. The aggregate is cured in the constant temperature and humidity curing chamber for 7 days, and then removed and dried.

[0037] In one embodiment, the modified paper mill dried sludge granules use paper mill dried sludge as a base material, and add one or more components from pulverized branches, leaves and rice straw as additives to the base material to obtain modified paper mill dried sludge granules. The amount of additives added to the modified paper mill dried sludge granules is 5-15% of the dry weight of the base material, preferably 8-12% of the dry weight of the base material.

[0038] In one embodiment, the primary filtration device includes a primary filter box 201. A set of coarse screens 202 and a set of fine screens 203 are sequentially arranged along the flow direction within the primary filter box 201. An inlet pipe 301 is connected to the upstream end of the primary filter box 201, and an outlet pipe 302 is connected to the downstream end. Polluted river and lake water needs to be diverted to the inlet pipe 301. The outlet pipe 302 is connected to the reverse-filter vegetation layer 104 in the upstream layered ecological restoration unit of the layered ecological restoration device. The drainage layer 101 in the downstream layered ecological restoration unit of the layered ecological restoration device is connected to a drainage pipe 304. Both the coarse screens 202 and fine screens 203 are made of stainless steel and work together to intercept larger particles in the polluted river and lake water. The inlet pipe 301, outlet pipe 302, connecting pipe 303, and drainage pipe 304 are all PVC pipes.

[0039] In one embodiment, the drainage layer 101, composite filter pad layer 102, composite regenerated filler layer 103, and reverse filter vegetation layer 104 in each layered ecological restoration unit are arranged sequentially from bottom to top in the ecological restoration box 105 with an open top.

[0040] An ecological purification method for polluted river and lake water uses the aforementioned ecological governance system for polluted rivers and lakes based on the recyclability of construction solid waste. The method is characterized by: diverting the polluted river and lake water to a primary filtration device, which traps larger particles in the polluted water; the pre-treated polluted water then enters a layered ecological restoration device; in each layered ecological restoration unit, the polluted water flows from top to bottom, and the pollutants in the polluted water sequentially pass through a reverse-filtration vegetation layer 104, a composite regenerated filler layer 103, and a composite filter pad layer 102 for purification; the purified water is discharged through a drainage layer 101; after discharge, a portion of the purified water can be used for other landscaping or toilet flushing, while the vast majority can be returned to the original water body.

[0041] This invention realizes the complete waste disposal of raw materials in layered ecological restoration units, and features high disposal efficiency, controllable cost, and environmental protection, providing a model case for the ecological governance of polluted rivers and lakes.

[0042] Example 1

[0043] An ecological restoration system for polluted rivers and lakes based on the recyclability of construction solid waste includes a primary filtration device and a layered ecological restoration device arranged sequentially along the flow direction. The layered ecological restoration device comprises three-level layered ecological restoration units. Each level of the layered ecological restoration unit includes a drainage layer 101, a composite filter media layer 102, a composite recycled filler layer 103, and a reverse filter vegetation layer 104 arranged sequentially from bottom to top. The drainage layer 101 is made of recycled aggregate from concrete construction waste. The composite filter media 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 dried sludge particles from a paper mill. The plants in the reverse filter vegetation layer 104 are *Hydrilla verticillata*.

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

[0045] In the composite filter media layer 102, the gradation range of the recycled aggregate from concrete construction waste, the recycled aggregate from brick construction waste, and the non-sintered clay-based functional aggregate is 2.36-9.5mm, and the thickness of the composite filter media layer 102 is 100mm. In the composite filter media layer 102, the volume percentage of recycled aggregate from concrete construction waste is 35%, the volume percentage of recycled aggregate from brick construction waste is 45%, and the volume percentage of non-sintered clay-based functional aggregate is 20%. In subbase 102, the mass ratio of recycled concrete construction waste aggregate with gradations of 2.36-4.75mm and 4.75-9.5mm is 60%:40%, the mass ratio of recycled brick construction waste aggregate with gradations of 2.36-4.75mm and 4.75-9.5mm is 60%:40%, and the mass ratio of non-sintered clay-based functional aggregate with gradations of 2.36-4.75mm and 4.75-9.5mm is 70%:30%.

[0046] In the composite recycled filler layer 103, the gradation range of the recycled aggregates from concrete construction waste, brick construction waste, non-sintered clay-based functional aggregates, and modified dried sludge particles from paper mills is 1.18-4.75 mm, and the thickness of the composite recycled filler layer 103 is 700 mm. Within the composite recycled filler layer 103, the volume percentage of recycled aggregates from concrete construction waste is 30%, the volume percentage of recycled aggregates from brick construction waste is 30%, the volume percentage of non-sintered clay-based functional aggregates is 25%, and the volume percentage of modified dried sludge particles from paper mills is 15%. In the composite recycled filler layer 103, the gradation range of the recycled aggregates from concrete construction waste, brick construction waste, non-sintered clay-based functional aggregates, and modified dried sludge particles from paper mills is 1.18-4.75 mm. 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 dried sludge granules from paper mills in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 65%:35%.

[0047] The planting density of Hydrilla verticillata in the reverse filter vegetation layer 104 is 14 clumps / square meter, and the thickness of the reverse filter 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 as an additive. After the base material and additive are mixed evenly, a certain amount of water is injected, and granulation is carried out in a pelletizing pan to form spherical particles. The spherical particles are then placed in a constant temperature and humidity curing chamber for 7 days and then dried to obtain the 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 granules use paper mill dried sludge as base material and add pulverized rice straw as an additive to the base material to obtain modified paper mill dried sludge granules. The amount of rice straw added to the modified paper mill dried sludge granules is 10% of the dry weight of the base material.

[0050] The polluted river and lake water with Class III pollution was purified using the ecological governance system for the recyclable use of construction solid waste in Example 1. The treatment effect of the polluted river and lake water after the three-level layered ecological restoration unit is shown in Table 1.

[0051] Table 1

[0052]

[0053] As shown in Table 1, after treatment by the three-level layered ecological restoration unit, the chemical oxygen demand (COD) concentration in the effluent of Class III polluted rivers and lakes reached the Class I water quality requirements, and the total phosphorus concentration reached the Class II water quality requirements.

[0054] Example 2

[0055] An ecological restoration system for polluted rivers and lakes based on the recyclability of construction solid waste includes a primary filtration device and a layered ecological restoration device arranged sequentially along the flow direction. The layered ecological restoration device comprises three-level layered ecological restoration units. Each level of the layered ecological restoration unit includes a drainage layer 101, a composite filter media layer 102, a composite recycled filler layer 103, and a reverse filter vegetation layer 104 arranged sequentially from bottom to top. The drainage layer 101 is composed of a mixture of recycled aggregate from concrete construction waste and recycled aggregate from brick construction waste. The composite filter media layer 102 is composed of 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 composed of a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste, non-sintered clay-based functional aggregate, and modified dried sludge particles from a paper mill. The plants in the reverse filter vegetation layer 104 are *Hydrilla verticillata*.

[0056] The drainage layer 101 has a gradation range of 4.75-16.5mm for recycled concrete construction waste aggregate and a thickness of 300mm. Within the drainage layer 101, the mass ratio of recycled concrete construction waste aggregate with gradations of 4.75-9.5mm to 9.5-16.5mm is 40%:60%, and the mass ratio of recycled brick construction waste aggregate with gradations of 4.75-9.5mm to 9.5-16.5mm is also 40%:60%.

[0057] In the composite filter media layer 102, the gradation range of the recycled aggregate from concrete construction waste, the recycled aggregate from brick construction waste, and the non-sintered clay-based functional aggregate is 2.36-9.5mm, and the thickness of the composite filter media layer 102 is 120mm. In the composite filter media layer 102, the volume percentage of recycled aggregate from concrete construction waste is 35%, the volume percentage of recycled aggregate from brick construction waste is 50%, and the volume percentage of non-sintered clay-based functional aggregate is 15%. In subbase 102, the mass ratio of recycled aggregate from concrete construction waste with gradations of 2.36-4.75mm and 4.75-9.5mm is 65%:35%; the mass ratio of recycled aggregate from brick construction waste with gradations of 2.36-4.75mm and 4.75-9.5mm is 50%:50%; and the mass ratio of non-sintered clay-based functional aggregate with gradations of 2.36-4.75mm and 4.75-9.5mm is 75%:25%.

[0058] In the composite recycled filler layer 103, the gradation range of the recycled aggregates from concrete construction waste, brick construction waste, non-sintered clay-based functional aggregates, and modified dried sludge particles from paper mills is 1.18-4.75 mm, and the thickness of the composite recycled filler layer 103 is 750 mm. Within the composite recycled filler layer 103, the volume percentage of recycled aggregates from concrete construction waste is 20%, the volume percentage of recycled aggregates from brick construction waste is 45%, the volume percentage of non-sintered clay-based functional aggregates is 20%, and the volume percentage of modified dried sludge particles from paper mills is 15%. In the composite recycled filler layer 103, the gradation range of the recycled aggregates from concrete construction waste, brick construction waste, non-sintered clay-based functional aggregates, and modified dried sludge particles from paper mills is 1.18-4.75 mm. 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 dried sludge granules from paper mills in the two gradation ranges of 1.18-2.36mm and 2.36-4.75mm is 60%:40%.

[0059] The planting density of Hydrilla verticillata in the reverse filter vegetation layer 104 is 14 clumps / square meter, and the thickness of the reverse filter vegetation layer 104 is 60 mm.

[0060] The non-sintered clay-based functional aggregate uses dried slurry as the base material, and aluminum hydroxide and aluminum chloride are added to the base material as additives. After the base material and additives are mixed evenly, a certain amount of water is injected, and granulation is carried out in a pelletizing pan to form spherical particles. The spherical particles are then placed in a constant temperature and humidity curing chamber for 7 days, and then dried to obtain the 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, and the amount of aluminum chloride added is 3% of the dry weight of the base material.

[0061] Among them, the modified paper mill dried sludge granules use paper mill dried sludge as base material and add pulverized branches as additives to the base material to obtain modified paper mill dried sludge granules. In the modified paper mill dried sludge granules, the amount of branches added is 15% of the dry weight of the base material.

[0062] The polluted river and lake water with Class III pollution was purified using the ecological governance system for the recyclable use of construction solid waste in Example 2. The treatment effect of the polluted river and lake water after the three-level layered ecological restoration unit is shown in Table 2.

[0063] Table 2

[0064]

[0065] As shown in Table 2, after treatment by the three-level layered ecological restoration unit, the chemical oxygen demand (COD) concentration in the effluent of Class III polluted rivers and lakes reached the Class I water quality requirements, and the total phosphorus concentration reached the Class II water quality requirements.

[0066] Example 3

[0067] An ecological restoration system for polluted rivers and lakes based on the recyclability of construction solid waste includes a primary filtration device and a layered ecological restoration device arranged sequentially along the flow direction. The layered ecological restoration device comprises two levels of layered ecological restoration units. Each level of layered ecological restoration unit includes a drainage layer 101, a composite filter media layer 102, a composite recycled filler layer 103, and a reverse filter vegetation layer 104 arranged sequentially from bottom to top. The drainage layer 101 is made of recycled aggregate from brick-made construction waste. The composite filter media layer 102 is a mixture of recycled aggregate from concrete-based construction waste, recycled aggregate from brick-made construction waste, and non-sintered clay-based functional aggregate. The composite recycled filler layer 103 is a mixture of recycled aggregate from concrete-based construction waste, recycled aggregate from brick-made construction waste, non-sintered clay-based functional aggregate, and modified dried sludge particles from a paper mill. The plant in the reverse filter vegetation layer 104 is water hyacinth.

[0068] 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. In the drainage layer 101, the mass ratio of the recycled aggregate from brick construction waste with gradation ranges of 4.75-9.5mm and 9.5-16.5mm is 40%:60%.

[0069] In the composite filter media layer 102, the gradation range of the recycled aggregate from concrete construction waste, the recycled aggregate from brick construction waste, and the non-sintered clay-based functional aggregate is 2.36-9.5mm, and the thickness of the composite filter media layer 102 is 120mm. In the composite filter media layer 102, the volume percentage of recycled aggregate from concrete construction waste is 40%, the volume percentage of recycled aggregate from brick construction waste is 52%, and the volume percentage of non-sintered clay-based functional aggregate is 8%. In subbase 102, the mass ratio of recycled aggregate from concrete construction waste with gradations of 2.36-4.75mm and 4.75-9.5mm is 65%:35%; the mass ratio of recycled aggregate from brick construction waste with gradations of 2.36-4.75mm and 4.75-9.5mm is 50%:50%; and the mass ratio of non-sintered clay-based functional aggregate with gradations of 2.36-4.75mm and 4.75-9.5mm is 75%:25%.

[0070] In the composite recycled filler layer 103, the gradation range of the recycled aggregates from concrete construction waste, brick construction waste, non-sintered clay-based functional aggregates, and modified dried sludge particles from paper mills is 1.18-4.75 mm, and the thickness of the composite recycled filler layer 103 is 750 mm. Within the composite recycled filler layer 103, the volume percentage of recycled aggregates from concrete construction waste is 30%, the volume percentage of recycled aggregates from brick construction waste is 45%, the volume percentage of non-sintered clay-based functional aggregates is 15%, and the volume percentage of modified dried sludge particles from paper mills is 10%. In the composite recycled filler layer 103, the gradation range of the recycled aggregates from concrete construction waste, brick construction waste, non-sintered clay-based functional aggregates, and modified dried sludge particles from paper mills is 1.18-4.75 mm. 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 dried sludge granules from paper mills 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 reverse filter vegetation layer 104 is 12 clumps / square meter, and the thickness of the reverse filter vegetation layer 104 is 60mm.

[0072] The non-sintered clay-based functional aggregate uses dried slurry as the base material, and aluminum hydroxide and aluminum chloride are added to the base material as additives. After the base material and additives are mixed evenly, a certain amount of water is injected, and granulation is carried out in a pelletizing pan to form spherical particles. The spherical particles are then placed in a constant temperature and humidity curing chamber for 7 days, and then dried to obtain the 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, and the amount of aluminum chloride added is 3% of the dry weight of the base material.

[0073] Among them, the modified paper mill dried sludge granules use paper mill dried sludge as base material and add pulverized branches as additives to the base material to obtain modified paper mill dried sludge granules. In the modified paper mill dried sludge granules, the amount of branches added is 15% of the dry weight of the base material.

[0074] The polluted river and lake water with Class II pollution was purified using the ecological treatment system for the recyclable use of construction solid waste in Example 3. The treatment effect of the polluted river and lake water after two-stage layered ecological restoration unit treatment is shown in Table 3.

[0075] Table 3

[0076]

[0077] As shown in Table 3, after treatment by two-stage layered ecological restoration units, the chemical oxygen demand removal rate of the polluted river and lake water of Class II pollution was (14.6-8.5) / 14.6 = 41.8%, and the total phosphorus removal rate was (0.4-0.25) / 0.4 = 37.5%.

[0078] In summary, the pollution river and lake ecological treatment system based on the recyclable use of construction solid waste in this invention can effectively remove inorganic eutrophic elements such as nitrogen and phosphorus from polluted river and lake water, and can also effectively remove organic pollutants from polluted river and lake water, thereby reducing the chemical oxygen demand and five-day biochemical oxygen demand in the effluent.

[0079] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A pollution river and lake ecological restoration system based on the recyclable use of construction solid waste, characterized in that: It includes a primary filtration device and a layered ecological restoration device arranged sequentially along the flow direction; the layered ecological restoration device includes several layers of layered ecological restoration units connected in series, and the layered ecological restoration unit includes a drainage layer (101), a composite filter pad layer (102), a composite recycled filler layer (103), and a reverse filter vegetation layer (104) arranged sequentially 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 aggregate from concrete construction waste and / or recycled aggregate from brick construction waste. The composite filter pad layer (102) is made of 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 made of a mixture of recycled aggregate from concrete construction waste, recycled aggregate from brick construction waste, non-sintered clay-based functional aggregate, and modified dried sludge particles from a paper mill. The non-sintered clay-based functional aggregate uses dried mud or engineering waste soil as the base material, and adds one or more components of aluminum hydroxide, aluminum chloride and aluminum silicate as additives to the base material. After the base material and additives are mixed evenly, a certain amount of water is injected, and granulation is carried out in a pelletizing pan to form spherical particles. The spherical particles are then placed in a constant temperature and humidity curing chamber for several days and then dried to obtain the non-sintered clay-based functional aggregate. The modified paper mill dried sludge granules use paper mill dried sludge as a base material, and add one or more components from powdered branches, leaves and rice straw as additives to the base material to obtain the modified paper mill dried sludge granules.

2. The ecological governance system for polluted rivers and lakes based on the recyclable use of construction solid waste according to claim 1, characterized in that: The gradation range of the recycled aggregates of concrete construction waste and / or brick construction waste in the drainage layer (101) is 4.75-16.5mm; the gradation range of the recycled aggregates of concrete construction waste, brick construction waste, and non-sintered clay-based functional aggregates in the composite filter media layer (102) is 2.36-9.5mm; and the gradation range of the recycled aggregates of concrete construction waste, brick construction waste, non-sintered clay-based functional aggregates, and modified paper mill dried sludge particles in the composite recycled filler layer (103) is 1.18-4.75mm.

3. The ecological governance system for polluted rivers and lakes based on the recyclable use of construction solid waste according to claim 2, characterized in that: The volume percentage of recycled aggregate from concrete construction waste in the composite filter media layer (102) ranges from 35% to 40%, the volume percentage of recycled aggregate from brick construction waste is controlled at 36% to 55%, and the volume percentage of non-sintered clay-based functional aggregate is controlled at 8% to 25%.

4. The ecological governance system for polluted rivers and lakes based on the recyclable use of construction solid waste according to claim 2, characterized in that: The volume percentage of the composite recycled filler layer (103) is 15-30% for concrete construction waste recycled aggregate, 30-45% for brick construction waste recycled aggregate, 10-25% for non-sintered clay-based functional aggregate, and 10-15% for modified paper mill dried sludge particles.

5. A pollution river and lake ecological governance system based on the recyclable use of construction solid waste according to claim 2, characterized in that: The thickness of the drainage layer (101) ranges from 200 to 400 mm, the thickness of the composite filter pad layer (102) ranges from 80 to 120 mm, the thickness of the composite regenerated filler layer (103) ranges from 550 to 750 mm, and the thickness of the reverse filter vegetation layer (104) ranges from 40 to 60 mm.

6. The ecological governance system for polluted rivers and lakes based on the recyclable use of construction solid waste according to claim 1, characterized in that: The plants in the reverse filter vegetation layer (104) are submerged or floating plants, the submerged plants include Hydrilla verticillata and / or Vallisneria natans, and the floating plants include Eichhornia crassipes and / or Nymphaea rubra.

7. The ecological governance system for polluted rivers and lakes based on the recyclable use of construction solid waste according to claim 1, characterized in that: The composite filter media layer (102) and the composite regenerated packing layer (103) can be regenerated and reused through backwashing.

8. The ecological governance system for polluted rivers and lakes based on the recyclable use of construction solid waste according to claim 1, characterized in that: The amount of additives added to the non-sintered clay-based functional aggregate is 3-8% of the dry weight of the aggregate.

9. A pollution river and lake ecological governance system based on the recyclable use of construction solid waste according to claim 1, characterized in that: The amount of additive added to the modified paper mill dried sludge granules is 5-15% of the dry weight of the base material.

10. An ecological purification method for polluted river and lake water, comprising using the ecological governance system for polluted rivers and lakes based on the recyclable use of construction solid waste as described in any one of claims 1-9, characterized in that, Specifically, the polluted river and lake water is diverted to the primary filtration device, which intercepts larger particles in the polluted river and lake water. The polluted river and lake water pretreated 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. The pollutants in the polluted river and lake water are purified by passing through the reverse filter vegetation layer (104), the composite regenerated filler layer (103), and the composite filter pad layer (102) in sequence. The purified river and lake water is discharged through the drainage layer (101).

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