Method for landfill of beet sugar factory filter mud and beet soil using open pit sand quarry pits

Abstract

The application discloses a method for filling filter mud and beet soil of a beet sugar factory in a quarry of an open-pit stone and sand field, which utilizes the quarry of the open-pit stone and sand field to build a landfill, and the construction of the landfill includes an anti-seepage film, a water guide ditch, a cofferdam, a water seepage pipe, a water seepage well and a water storage pool; the filter mud is filled in the built landfill, and is compacted while being filled; the beet soil is covered on the filter mud, and the area after the beet soil is covered becomes a vegetation recovery area in which plants can be planted, and perennial grass is planted in the vegetation recovery area to recover the vegetation. The method solves the filling treatment problem of the filter mud and the beet soil of the beet sugar factory, simultaneously, the quarry of the open-pit stone and sand field is repaired, and the method is simple and feasible, low in cost, and fully meets the environmental protection requirements.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solid waste treatment, and in particular to a method for filling beet sugar factory filter mud and beet soil in a mine pit of an open pit quarry. BACKGROUND

[0002] At present, the double carbonic acid method is used in the method for producing sugar from beets. After the beets are cleaned, washed, sliced, and leached, lime milk filtered and slaked is added to the leached juice containing sugar, and after reaction, carbon dioxide gas (kiln gas) is introduced for neutralization. After neutralization, calcium carbonate (a component of filter mud) mud juice is obtained, which is filtered by a diaphragm plate frame, washed, and pressurized (3.5 air compressions) to remove the filter mud containing 60%-65% water. For a sugar factory using beets as raw material, 1.1-1.2 tons of filter mud is produced per 100 tons of beets. The main component of filter mud is calcium carbonate, which contains a small amount of organic matter. If left untreated, the water in the filter mud will overflow. At present, filter mud from a beet sugar factory cannot be directly utilized in large quantities. Filter mud has small particles, low specific gravity, strong adsorption, and is easy to dry and disperse to form dust, making it difficult to handle and utilize. Filter mud is an inorganic waste that is odorless, tasteless, and does not produce gas, which is different from tailings, construction waste, and household waste.

[0003] Beets are irregular cones. Beets have two root grooves, and root hairs grow in the root grooves. Some of the root hairs are broken off and fall off during harvesting, and some remain attached to the beet root. The root hairs of beets have secretions that stick to the soil brought in from the field in the root grooves. Before beets are transported from the field to the factory, the soil adhering to the beets and the intermingled soil between the beets cannot be completely cleaned. A portion of the soil is removed mechanically before the beets are washed in the workshop. After the beets are washed, the sediment and collected mud and sand are also beet soil. For every 100 tons of beets produced, 2-3 tons of beet soil is produced. If it rains or snows during the purchase period, more soil will adhere to the beet tubers. This beet soil also needs to be removed from the factory for disposal. In addition to having the characteristics of a suitable plant growth layer of soil, beet soil also has a certain degree of stickiness, which can be used to cover filter mud, has the functions of water storage and retention, dust prevention, erosion reduction, and environmental protection. SUMMARY

[0004] The present application aims to solve the problem of beet sugar factory filter mud and beet soil disposal, and proposes a method for filling beet sugar factory filter mud and beet soil in a mine pit of an open pit quarry. This method solves the problem of filter mud and beet soil disposal, and also restores the open pit quarry mine pit, restores the ecology, and has the characteristics of simple and feasible method, low cost, and complete compliance with environmental protection requirements.

[0005] The technical scheme adopted by the present application is: a method for filling beet sugar factory filter mud and beet soil in open pit quarry sand mining pit, which comprises the following steps.

[0006] S1, constructing a landfill: selecting a traffic-convenient open pit quarry sand mining pit, leveling the pit bottom and the protruding stones and pits of the pit wall, covering the pit bottom with 10-30 cm thick beet soil to form a soil cushion, laying a water-impermeable membrane on the soil cushion, sealing the connection of the water-impermeable membrane with hot melting to prevent water leakage, and placing the water-impermeable membrane around the pit on the ground; constructing a water diversion ditch around the pit, piling up the soil and stones taken from the water diversion ditch on the inner side of the water diversion ditch to form a cofferdam, compacting the cofferdam around the water-impermeable membrane, and setting a water diversion ditch drainage outlet on the low side of the pit; constructing a water infiltration well and a water reservoir outside the pit on the low side of the pit; and arranging a plurality of water infiltration pipes connected to the water infiltration well on the water-impermeable membrane at the bottom of the pit, densely arranging water infiltration holes on the water infiltration pipes, and covering the water infiltration pipes with a gravel filling layer.

[0007] S2, filling filter mud: filling filter mud in the constructed landfill and tamping it; after the filter mud is filled to the ground level near the pit opening, covering the filter mud with beet soil, and the beet soil is slightly higher than the ground level near the pit opening, the area after the beet soil is covered becomes a vegetation restoration area where plants can be planted.

[0008] S3, later management: planting perennial grasses in the vegetation restoration area, timely replanting the grasses according to the survival condition, and timely watering according to the rainfall condition; after the rain, observing whether there is water accumulation in the water infiltration well, and timely pumping the water to the water reservoir if there is water accumulation, and irrigating the grasses and shrubs in the vegetation restoration area with the water in the water reservoir when there is enough water in the water reservoir.

[0009] Preferably, in step S1, the pit bottom is covered with 10-30 cm thick beet soil to form a soil cushion.

[0010] Preferably, in step S1, the water infiltration pipes are covered with 10-30 cm thick gravel filling layer.

[0011] Preferably, in step S1, the water-impermeable membrane is a 0.5-1.2 mm thick geotextile water-impermeable membrane.

[0012] Preferably, in step S1, the water infiltration pipes include main water infiltration pipes and branch water infiltration pipes, the water outlets of the main water infiltration pipes are connected to the water infiltration well, the branch water infiltration pipes are connected to the main water infiltration pipes, and the water infiltration holes are densely arranged on each branch water infiltration pipe.

[0013] Preferably, in step S1, the water infiltration pipes are PVC pipes.

[0014] Preferably, in step S1, the water infiltration well has a depth of 2-3 m, and is provided with a wellhead platform with a height of 5-10 cm above the ground; the water outlet of the main water infiltration pipe is 1 m higher than the bottom of the well.

[0015] Preferably, in step S1, the water storage pool is 10-15m long, 10-15m wide and 0.5m deep, and a protective fence is arranged around the water storage pool.

[0016] Preferably, in step S1, the bottom and side wall of the water channel are built with bricks and smoothed with cement, and after being repaired, the water channel has a width of 30cm at the top and 24cm at the bottom, and a depth of 30cm; the cofferdam water-facing surface is built with block stones and cemented, and after being repaired, the cofferdam is trapezoidal, with a top width of 40cm, a bottom width of 60cm and a height of 50-100cm.

[0017] Preferably, in step S2, 20-30cm thick beet soil is covered on the filter mud.

[0018] Preferably, in step S3, the perennial grass is Elymus dahuricus Turcz and / or Agropyron cristatum.

[0019] Compared with the prior art, the present application has the following beneficial effects.

[0020] (1) The present application uses the mine pit of an open-pit stone and sand mining field to build a landfill, thereby reducing the amount of earthwork excavation and lowering the construction cost, and both the mine pit of the open-pit stone and sand mining field and the problem of processing filter mud and beet soil of a beet sugar factory are solved.

[0021] (2) The construction of the landfill of the present application includes an anti-seepage film, a water channel, a cofferdam, a water seepage pipe, a water seepage well and a water storage pool, and completely meets the environmental protection requirements.

[0022] (3) The main components of the filter mud of the present application are calcium carbonate, a small amount of organic matter and a trace amount of calcium oxide, and the organic matter is beet fiber debris, beet root hair, protein, pectin and the like in the beet; the beet soil is soil produced by screening and washing beet tubers in a beet sugar factory, and the beet soil has the characteristics of a suitable plant growth layer soil and a certain viscosity, and it is very suitable to cover the filter mud with the beet soil, the covering effect is good, and the problems of water storage and preservation, dust prevention and erosion reduction are completely solved; after the beet soil is covered on the filter mud, the filter mud can be planted with grass, and after 2-3 years of planting and management, the vegetation will be completely restored.

[0023] (4) The grass for restoring vegetation of the present application is selected from perennial Elymus dahuricus Turcz and Agropyron cristatum, and both of them are dominant plants for restoring vegetation, and have the characteristics of drought resistance, cold resistance and wind and sand resistance, and in particular, they have the characteristic of salt and alkali resistance, and are very suitable for planting in a vegetation restoration area. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of a top view of the landfill of the present application.

[0025] Figure 2is a landfill side view structure schematic diagram of the present application.

[0026] Figure 3 is Figure 2 A part structure of the enlarged view.

[0027] Figure 4 is Figure 2 B part structure of the enlarged view.

[0028] Figure: 1 - soil cushion, 2 - impermeable membrane, 3 - water ditch, 4 - cofferdam, 5 - water ditch drainage, 6 - main seepage pipe, 7 - branch seepage pipe, 8 - seepage hole, 9 - gravel filling layer, 10 - seepage well, 11 - water storage tank, 12 - filter mud, 13 - sugar beet soil, 14 - pasture. DETAILED DESCRIPTION

[0029] The technical solutions of the present application are described clearly and completely below in combination with the drawings.

[0030] Example 1: as shown in Figures 1 to 4 , a method for filling filter mud and sugar beet soil of sugar beet factory in open-pit quarry sand mining pit, which comprises the following steps.

[0031] S1, build landfill: choose a distance of 5 kilometers from the sugar beet factory traffic convenient abandoned fluorite mine pit, flat processing pit bottom and pit wall sharp protruding stone and pit, pit bottom cover sugar beet soil compaction to form 15-20cm soil cushion 1; 1mm thick HDPE geomembrane is laid on the soil cushion to form an impermeable membrane 2, the connection of the impermeable membrane 2 is sealed by hot melting without water leakage, the impermeable membrane 2 is placed on the ground around the pit; build water ditch 3 around the mine pit, the bottom and side wall of the water ditch are well laid with bricks and smoothed with cement, after the repair, the water ditch has a width of 30cm at the top and a width of 24cm at the bottom, and a depth of 30cm; the soil and stone taken from the water ditch 3 is piled inside the water ditch 3 to form a trapezoidal cofferdam 4, the water-facing surface of the cofferdam is well laid with blocks, and the joints are sealed with cement, after the repair, the cofferdam is trapezoidal, the top width of the trapezoidal cofferdam is 40cm, the bottom width is 60cm, and the height is 60cm; the cofferdam 4 compacts the surrounding of the impermeable membrane 2, and a water ditch drainage 5 is arranged on the low side of the mine pit; a seepage well 9 and a water storage tank 10 are built outside the pit on the low side of the mine pit; the depth of the seepage well is 2.5m, and the seepage well is provided with a wellhead platform 6cm higher than the ground; the water storage tank has a length of 15m, a width of 10m, and a depth of 0.5m, and a protective fence is arranged around the water storage tank; a main seepage pipe 6 made of PVC is arranged on the impermeable membrane 2 at the bottom of the mine pit, the water outlet of the main seepage pipe 6 is connected to the seepage well 9, and the water outlet height of the main seepage pipe 6 is 1m higher than the well bottom; a plurality of branch seepage pipes 7 made of PVC are connected to the two sides of the main seepage pipe 6, and a plurality of seepage holes 8 are densely arranged on the branch seepage pipes; a gravel filling layer 9 with a thickness of 15-20cm is covered on the main seepage pipe 6 and the branch seepage pipe 7.

[0032] S2, filling and compacting the filter mud 12 in the built landfill; after the filter mud 12 is filled to the ground level near the pit opening, a 20-30cm thick beet soil 13 is covered on the filter mud 12, and the beet soil 13 is slightly higher than the ground level near the pit opening; and after the beet soil 13 is covered, the filling area becomes a vegetation restoration area where plants can be planted.

[0033] S3, later management: planting the grass 14 in the vegetation restoration area, the grass being the Elymus nutans, timely reseeding the grass 14 according to the survival condition, and timely watering according to the rainfall condition; after the rain, observing whether the water seepage well 10 has water accumulation, and timely pumping the water to the water storage tank 11 if there is water accumulation; and when there is enough water in the water storage tank 11, watering the grass 14 in the vegetation restoration area with the water in the water storage tank 11.

[0034] The embodiment has been implemented for 3 years, the planted grass 13 being the Elymus nutans; the first year, the Elymus nutans has a seedling emergence rate of 65%, and the seedling density meets the requirement of the grass density; the second year, the Elymus nutans has a green return rate of 81%; the beet soil 12 and the filter mud 11 in the vegetation restoration area have no water erosion and wind erosion, and the water seepage well 9 has no water seepage.

[0035] It should be finally pointed out that the above specific embodiments are only used to explain the technical solutions of the present application, and not to limit the protection scope of the present application; the simple modification or equivalent replacement of the technical solutions of the present application by the ordinary skilled in the art does not deviate from the essence and scope of the technical solutions of the present application.

Claims

1. A method for landfilling beet sugar factory filtrate mud and beet soil by using open-pit quarry sandpit, comprising the following steps: S1, building a landfill: selecting a convenient open-pit quarry sandpit, leveling the stones and pits on the pit bottom and pit wall, covering the pit bottom with 10-30 cm thick beet soil to form a soil cushion, laying a waterproof membrane on the soil cushion, connecting the waterproof membrane with hot melting sealing connection, laying the waterproof membrane around the pit on the ground, building a water diversion ditch around the pit, piling up the soil and stones in the water diversion ditch to form a cofferdam, compacting the cofferdam around the waterproof membrane, setting a water diversion ditch drainage outlet on the low side of the pit, building a water seepage well and a water storage pool outside the pit on the low side, laying a plurality of water seepage pipes connected with the water seepage well on the waterproof membrane on the pit bottom, densely laying water seepage holes on the water seepage pipes, and covering the water seepage pipes with a gravel filling layer; S2, landfilling the filtrate mud: filling the filtrate mud in the built landfill, and tamping while filling; after the filtrate mud is filled to the ground level near the pit opening, covering the filtrate mud with 20-30 cm thick beet soil, and the beet soil is slightly higher than the ground level near the pit opening, and the area after covering the beet soil becomes a vegetation restoration area where plants can be planted; S3, later management: planting perennial grasses in the vegetation restoration area, timely replanting the grasses according to the survival condition, and timely watering according to the rainfall condition; after the rain, observing whether the water seepage well has accumulated water, and timely pumping the accumulated water to the water storage pool with a water pump, and watering the grasses and shrubs in the vegetation restoration area with the water in the water storage pool when the water storage pool has enough water.

2. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 1, characterized by the fact that: In step S1, the pit bottom is covered with 10-30 cm thick beet soil to form a soil cushion.

3. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 2, characterized by the fact that: In step S1, the water seepage pipes are covered with 10-30 cm thick gravel filling layer.

4. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 3, characterized by the fact that: In step S1, the waterproof membrane is 0.5-1.2 mm thick.

5. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 4, characterized by the fact that: In step S1, the water seepage pipes include main water seepage pipes and branch water seepage pipes, the water outlets of the main water seepage pipes are connected with the water seepage well, the branch water seepage pipes are connected with the main water seepage pipes, and the water seepage holes are densely laid on each branch water seepage pipe.

6. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 5, characterized by the fact that: In step S1, the water seepage pipes are PVC pipes.

7. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 6, characterized by the fact that: In step S1, the water seepage well has a wellhead platform 5-10 cm higher than the ground, and the water outlets of the main water seepage pipes are 1 m higher than the well bottom.

8. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 7, characterized by the fact that: In step S1, the water storage pool is 10-15 m long, 10-15 m wide, and 0.5 m deep, and a protective fence is arranged around the water storage pool.

9. The method for landfilling of sugar beet filter mud and beet soil in open pit sand quarries' pits according to claim 8, characterized by the fact that: In step S1, the bottom and side wall of the water diversion ditch are brick-laid and cement-smoothed, the water diversion ditch has a 30 cm wide upper opening, a 24 cm wide lower bottom, and a 30 cm depth, the cofferdam has a 40 cm wide upper top, a 60 cm wide lower bottom, and a 50-100 cm height, and the cofferdam is trapezoidal-shaped.

10. The method for landfilling beet mud and beet soil from sugar beet factories in open-cast quarry sand pits according to claim 9, characterized in that: In step S2, the filtrate mud is covered with 20-30 cm thick beet soil.

11. The method for landfilling of filter mud and beet soil of sugar beet factories in quarries for sand extraction from open-cast quarries according to claim 10, characterized by the fact that: In step S3, the perennial grasses are Elymus dahuricus and / or Agropyron cristatum.

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