Harmless treatment process for waste vegetable leaves

Abstract

The invention discloses a harmless treatment process for waste vegetable leaves, and belongs to the technical field of cyclic utilization. The method comprises the following steps: S1, squeezing the waste vegetable leaves: crushing the waste vegetable leaves, and squeezing to obtain waste vegetable leaf raffinate I and residues; s2, recycling the residues: recycling the residues of the waste vegetable leaves; s3, coagulating sedimentation of the raffinate I: enabling the raffinate of the waste vegetable leaves to enter a coagulating sedimentation tank, and meanwhile, adding a coagulant into the coagulating sedimentation tank for coagulating sedimentation to obtain raffinate II and sludge I; the waste vegetable leaves are squeezed after being crushed, the residues are recycled, the environment pollution caused by random discarding of the residues is avoided, the economic benefit can be improved, the income can be increased, and meanwhile, after the residual liquid is subjected to coagulating sedimentation, hydrolytic acidification, stacked screw machine treatment, anaerobic treatment, anoxic treatment, aerobic treatment, secondary sedimentation, ozone oxidation and constructed wetland treatment, the residual liquid can be recycled, and the waste vegetable leaves can be recycled. And the discharged water can be used as irrigation water for irrigating the farmland, so that the purposes of saving water resources and realizing green development are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of recycling, and in particular to a harmless treatment process for discarded vegetable leaves. Background Art

[0002] In many vegetable producing areas, vegetable trading markets produce a large amount of discarded vegetable leaves every day. Due to the low recycling value of these discarded vegetable leaves, people have rarely studied the recycling technology, and there is no good treatment technology yet. People usually feed livestock with a small amount of discarded vegetable leaves, but for a large number of discarded vegetable leaves, because they contain rotten and spoiled leaves, they cannot be directly used to feed livestock, otherwise it will easily cause livestock to become sick; a large number of discarded vegetable leaves are piled up everywhere because no one recycles them, which is not only a waste, but also causes environmental pollution; in cities with good environmental protection, discarded vegetable leaves are transported to garbage treatment plants every day for garbage treatment, resulting in a huge waste of resources, manpower and material resources. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a process for harmless treatment of waste vegetable leaves; it can solve the problem that there is little technical research on the recycling of waste vegetable leaves and there is currently no good treatment technology.

[0004] Technical solution: To solve the above technical problems, according to one aspect of the present invention, more specifically, a process for harmless treatment of waste vegetable leaves comprises the following steps:

[0005] S1. Squeezing the discarded vegetable leaves: crushing the discarded vegetable leaves and squeezing them to obtain a discarded vegetable leaf residual liquid and a residue;

[0006] S2. Residue resource utilization: Recycling the waste vegetable leaves;

[0007] S3, residual liquid 1 coagulation and sedimentation: the residual liquid of the discarded vegetable leaves enters the coagulation and sedimentation tank, and a coagulant is added to the coagulation and sedimentation tank for coagulation and sedimentation to obtain residual liquid 2 and sludge 1;

[0008] S4, hydrolysis and acidification of residual liquid II: the residual liquid II enters the hydrolysis and acidification tank for hydrolysis and acidification, and the macromolecular organic matter in the residual liquid II is decomposed into small molecular organic matter to obtain residual liquid III and sludge II;

[0009] S5, residual liquid three is treated by the snail press: residual liquid three enters the snail press, and flocculants are added to the snail press at the same time. Air is introduced into the wastewater to generate tiny bubbles, and under the action of the flocculants, pollutants in residual liquid three are adhered to the bubbles, thereby obtaining residual liquid four and sludge three;

[0010] S6. Anaerobic treatment of residual liquid IV: The residual liquid IV enters the anaerobic tank, where anaerobic bacteria are used to hydrolyze, acidify and methanize organic matter, remove organic matter from the wastewater, and improve the biodegradability of the wastewater;

[0011] S7. Anoxic treatment of residual liquid after anaerobic treatment: The residual liquid after anaerobic treatment enters the anoxic tank to remove nitrate nitrogen through denitrification, and also remove part of the biological oxygen demand;

[0012] S8, aerobic treatment of residual liquid after anoxic treatment: the residual liquid after anoxic treatment enters the aerobic tank, undergoes aerobic respiration to further decompose organic matter into inorganic matter;

[0013] S9. Secondary sedimentation of residual liquid IV after aerobic treatment: The residual liquid IV after aerobic treatment enters the secondary sedimentation tank, and the heavier sludge particles are settled to the bottom of the tank by gravity sedimentation, thereby obtaining supernatant and sludge IV;

[0014] S10, sludge treatment: dehydration and subsequent disposal of sludge 1, sludge 2, sludge 3 and sludge 4;

[0015] S11, ozone oxidation treatment of the supernatant: the supernatant enters an ozone oxidation tower, and ozone is added to the ozone oxidation tower to sterilize and disinfect the supernatant and remove pollutants;

[0016] S12. Reprocessing of the supernatant after ozone oxidation: The supernatant after ozone oxidation is reprocessed through artificial wetlands, and the effluent is used as irrigation water for irrigating farmland.

[0017] Furthermore, in the step S1, when the waste vegetable leaves are crushed, the waste vegetable leaves are crushed into waste vegetable leaf fragments of 3-10 mm.

[0018] Furthermore, in the step S1, when the crushed discarded vegetable leaves are pressed, the pressing pressure is 1.2Mpa-1.8Mpa.

[0019] Furthermore, in step S2, the method for resource utilization of the residue of discarded vegetable leaves includes: drying the residue of discarded vegetable leaves, and controlling the moisture content of the dried vegetable leaf fragments to be between 10% and 15%; secondary crushing the dried vegetable leaf fragments, and sieving them with a 60-mesh sieve after crushing; packaging the sieved vegetable leaf powder to produce vegetable leaf feed powder; adding lignite, chicken manure, tobacco powder and fermentation bacteria to the residue of discarded vegetable leaves, stirring and mixing them evenly, and then fermenting them in piles, and when the temperature inside the fermentation pile rises to 65-70°C, turning the pile, and when the temperature of the fermented product drops to room temperature after turning the pile, fermenting them in piles again, and after three to five times of fermentation, the fermented product is fully decomposed to make organic fertilizer.

[0020] Furthermore, the contents of the waste vegetable leaf residue, lignite, chicken manure, tobacco leaf powder and fermentation bacteria in step S2 are calculated by weight as follows: 28-33 parts of waste vegetable leaf residue, 27-38 parts of lignite, 32-43 parts of chicken manure, 7-12 parts of tobacco leaf powder and 0.2-0.5 parts of fermentation bacteria.

[0021] Furthermore, in step S3, the coagulant is one or more of aluminum sulfate, polyaluminum chloride, ferrous sulfate, ferric chloride and polyferric sulfate.

[0022] Furthermore, in step S5, the flocculant is one or more of a natural polymer modified flocculant, a synthetic polymer flocculant and a composite flocculant.

[0023] Furthermore, in step S10, chlorophyll is extracted from sludge 2 by methods including but not limited to acetone extraction; sludge 1, sludge 2 after chlorophyll extraction, sludge 3 and sludge 4 are dehydrated, and subsequent disposal includes use as organic fertilizer after harmless treatment and use as soil conditioner to improve soil structure.

[0024] Beneficial effects: The discarded vegetable leaves are crushed and then squeezed, and the residues are utilized as resources. While avoiding the random discard of residues to pollute the environment, it can also improve economic benefits and increase income. At the same time, the residual liquid is treated by coagulation and sedimentation, hydrolysis and acidification, snail stacking machine, anaerobic treatment, anoxic treatment, aerobic treatment, secondary precipitation, ozone oxidation and artificial wetland treatment. The effluent can be used as irrigation water for farmland, thereby achieving the purpose of saving water resources and green development. At the same time, the obtained sludge can be used as organic fertilizer or soil conditioner after treatment, avoiding the pollution of the environment by sludge while further improving the economic benefits. The above process can be used to harmlessly treat the discarded vegetable leaves, which can not only avoid the pollution of the environment by the discarded vegetable leaves and the huge waste of resources, manpower and material resources caused by the treatment of waste gas leaves, but also improve economic benefits, save water resources and achieve the goal of green development. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a process flow diagram. DETAILED DESCRIPTION

[0026] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] The first step is to squeeze the waste vegetable leaves: crush the waste vegetable leaves into 3 mm waste vegetable leaf fragments, and then apply a pressure of 1.2 Mpa to squeeze them to obtain waste vegetable leaf residual liquid and residue.

[0029] The second step is to utilize the residue as a resource: the waste vegetable leaf residue is utilized as a resource. The method for utilizing the waste vegetable leaf residue as a resource includes: drying the waste vegetable leaf residue, and controlling the moisture content of the dried vegetable leaf fragments to be 10%; crushing the dried vegetable leaf fragments for a second time, and sieving them with a 60-mesh sieve after crushing; packaging the sieved vegetable leaf powder to produce vegetable leaf feed powder; adding lignite, chicken manure, tobacco leaf powder and fermentation bacteria to the waste vegetable leaf residue, and stirring and mixing 28 parts of waste vegetable leaf residue, 27 parts of lignite, 32 parts of chicken manure, 7 parts of tobacco leaf powder and 0.2 parts of fermentation bacteria, and then fermenting them in piles. When the temperature inside the fermentation pile rises to 65°C, the pile is turned over. When the temperature of the fermented material drops to room temperature after turning the pile, the pile is fermented again. After three fermentations, the fermented material is fully decomposed to be made into organic fertilizer.

[0030] The third step is coagulation and sedimentation of residual liquid one: the residual liquid of the discarded vegetable leaves enters the coagulation and sedimentation tank, and aluminum sulfate is added to the coagulation and sedimentation tank for coagulation and sedimentation to obtain residual liquid two and sludge one.

[0031] The fourth step is the hydrolysis and acidification of the residual liquid II: the residual liquid II enters the hydrolysis and acidification tank for hydrolysis and acidification, and the macromolecular organic matter in the residual liquid II is decomposed into small molecular organic matter to obtain residual liquid III and sludge II.

[0032] The fifth step is the treatment of residual liquid three by the snail stacking machine: the residual liquid three enters the snail stacking machine, and at the same time, a natural polymer modified flocculant is added to the snail stacking machine. By introducing air into the wastewater to generate tiny bubbles, the pollutants in the residual liquid three are adhered to the bubbles under the action of the natural polymer modified flocculant, thus obtaining residual liquid four and sludge three.

[0033] Step 6, anaerobic treatment of residual liquid IV: The residual liquid IV enters the anaerobic tank, and uses anaerobic bacteria to hydrolyze, acidify and methanize organic matter, remove organic matter in the wastewater, and improve the biodegradability of the sewage.

[0034] The seventh step is anoxic treatment of the residual liquid after anaerobic treatment: the residual liquid after anaerobic treatment enters the anoxic tank to remove nitrate nitrogen through denitrification, and also removes part of the biological oxygen demand.

[0035] Step 8. Aerobic treatment of the residual liquid after anoxic treatment: The residual liquid after anoxic treatment enters the aerobic tank for aerobic respiration to further decompose organic matter into inorganic matter.

[0036] The ninth step is secondary sedimentation of the residual liquid IV after aerobic treatment: The residual liquid IV after aerobic treatment enters the secondary sedimentation tank, and the heavier sludge particles are settled to the bottom of the tank by gravity sedimentation, thereby obtaining supernatant and sludge IV.

[0037] In the tenth step, chlorophyll is extracted from sludge 2 by methods including but not limited to acetone extraction; sludge 1, sludge 2 after chlorophyll extraction, sludge 3 and sludge 4 are dehydrated, and subsequent disposal includes use as organic fertilizer after harmless treatment and use as soil conditioner to improve soil structure.

[0038] The eleventh step is ozone oxidation treatment of the supernatant: the supernatant enters the ozone oxidation tower, into which ozone is added to sterilize and disinfect the supernatant and remove pollutants.

[0039] Step 12: Reprocessing of the supernatant after ozone oxidation: Reprocess the supernatant after ozone oxidation through artificial wetlands, and use the effluent as irrigation water for irrigating farmland.

[0040] Example 2

[0041] The first step is to squeeze the waste vegetable leaves: crush the waste vegetable leaves into 7 mm waste vegetable leaf fragments, and then apply a pressure of 1.5 MPa to squeeze them to obtain waste vegetable leaf residual liquid and residue.

[0042] The second step is to utilize the residue as a resource: the waste vegetable leaf residue is utilized as a resource. The method for utilizing the waste vegetable leaf residue as a resource includes: drying the waste vegetable leaf residue, and controlling the moisture content of the dried vegetable leaf fragments to be 13%; crushing the dried vegetable leaf fragments for a second time, and sieving them with a 60-mesh sieve after crushing; packaging the sieved vegetable leaf powder to produce vegetable leaf feed powder; adding lignite, chicken manure, tobacco leaf powder and fermentation bacteria to the waste vegetable leaf residue, and stirring and mixing 30 parts of waste vegetable leaf residue, 32 parts of lignite, 37 parts of chicken manure, 10 parts of tobacco leaf powder and 0.3 parts of fermentation bacteria, and then fermenting them in piles. When the temperature inside the fermentation pile rises to 67°C, the pile is turned over. When the temperature of the fermented material drops to room temperature after turning the pile, the pile is fermented again. After four times of fermentation, the fermented material is fully decomposed to be made into organic fertilizer.

[0043] The third step is coagulation and sedimentation of residual liquid one: the residual liquid of the discarded vegetable leaves enters the coagulation and sedimentation tank, and polyaluminium chloride is added to the coagulation and sedimentation tank for coagulation and sedimentation to obtain residual liquid two and sludge one.

[0044] The fourth step is the hydrolysis and acidification of the residual liquid II: the residual liquid II enters the hydrolysis and acidification tank for hydrolysis and acidification, and the macromolecular organic matter in the residual liquid II is decomposed into small molecular organic matter to obtain residual liquid III and sludge II.

[0045] The fifth step is the treatment of residual liquid three by the snail stacking machine: the residual liquid three enters the snail stacking machine, and at the same time, a synthetic polymer flocculant is added to the snail stacking machine. By introducing air into the wastewater to generate tiny bubbles, the pollutants in the residual liquid three are adhered to it under the action of the synthetic polymer flocculant, thus obtaining residual liquid four and sludge three.

[0046] Step 6, anaerobic treatment of residual liquid IV: The residual liquid IV enters the anaerobic tank, and uses anaerobic bacteria to hydrolyze, acidify and methanize organic matter, remove organic matter in the wastewater, and improve the biodegradability of the sewage.

[0047] The seventh step is anoxic treatment of the residual liquid after anaerobic treatment: the residual liquid after anaerobic treatment enters the anoxic tank to remove nitrate nitrogen through denitrification, and also removes part of the biological oxygen demand.

[0048] Step 8. Aerobic treatment of the residual liquid after anoxic treatment: The residual liquid after anoxic treatment enters the aerobic tank for aerobic respiration to further decompose organic matter into inorganic matter.

[0049] The ninth step is secondary sedimentation of the residual liquid IV after aerobic treatment: The residual liquid IV after aerobic treatment enters the secondary sedimentation tank, and the heavier sludge particles are settled to the bottom of the tank by gravity sedimentation, thereby obtaining supernatant and sludge IV.

[0050] In the tenth step, chlorophyll is extracted from sludge 2 by methods including but not limited to acetone extraction; sludge 1, sludge 2 after chlorophyll extraction, sludge 3 and sludge 4 are dehydrated, and subsequent disposal includes use as organic fertilizer after harmless treatment and use as soil conditioner to improve soil structure.

[0051] The eleventh step is ozone oxidation treatment of the supernatant: the supernatant enters the ozone oxidation tower, into which ozone is added to sterilize and disinfect the supernatant and remove pollutants.

[0052] Step 12: Reprocessing of the supernatant after ozone oxidation: Reprocess the supernatant after ozone oxidation through artificial wetlands, and use the effluent as irrigation water for irrigating farmland.

[0053] Example 3

[0054] The first step is to squeeze the waste vegetable leaves: crush the waste vegetable leaves into 10 mm waste vegetable leaf fragments, and then apply a pressure of 1.8 MPa to squeeze them to obtain waste vegetable leaf residual liquid and residue.

[0055] The second step is to utilize the residue as a resource: the waste vegetable leaf residue is utilized as a resource. The method for utilizing the waste vegetable leaf residue as a resource includes: drying the waste vegetable leaf residue, and controlling the moisture content of the dried vegetable leaf fragments to be 13%; crushing the dried vegetable leaf fragments for a second time, and sieving them with a 60-mesh sieve after crushing; packaging the sieved vegetable leaf powder to produce vegetable leaf feed powder; adding lignite, chicken manure, tobacco leaf powder and fermentation bacteria to the waste vegetable leaf residue, and stirring and mixing 33 parts of waste vegetable leaf residue, 38 parts of lignite, 43 parts of chicken manure, 12 parts of tobacco leaf powder and 0.5 parts of fermentation bacteria, and then fermenting them in piles. When the temperature inside the fermentation pile rises to 67°C, the pile is turned over. When the temperature of the fermented material drops to room temperature after turning the pile, the pile is fermented again. After five times of fermentation, the fermented material is fully decomposed and made into organic fertilizer.

[0056] The third step is coagulation and sedimentation of residual liquid one: the residual liquid of the discarded vegetable leaves enters the coagulation and sedimentation tank, and at the same time, ferric chloride is added to the coagulation and sedimentation tank for coagulation and sedimentation to obtain residual liquid two and sludge one.

[0057] The fourth step is the hydrolysis and acidification of the residual liquid II: the residual liquid II enters the hydrolysis and acidification tank for hydrolysis and acidification, and the macromolecular organic matter in the residual liquid II is decomposed into small molecular organic matter to obtain residual liquid III and sludge II.

[0058] The fifth step is the treatment of residual liquid three by the snail stacking machine: the residual liquid three enters the snail stacking machine, and at the same time, a composite flocculant is added to the snail stacking machine. Air is introduced into the wastewater to generate tiny bubbles. Under the action of the composite flocculant, the pollutants in the residual liquid three adhere to it, and residual liquid four and sludge three are obtained.

[0059] Step 6, anaerobic treatment of residual liquid IV: The residual liquid IV enters the anaerobic tank, and uses anaerobic bacteria to hydrolyze, acidify and methanize organic matter, remove organic matter in the wastewater, and improve the biodegradability of the sewage.

[0060] The seventh step is anoxic treatment of the residual liquid after anaerobic treatment: the residual liquid after anaerobic treatment enters the anoxic tank to remove nitrate nitrogen through denitrification, and also removes part of the biological oxygen demand.

[0061] Step 8. Aerobic treatment of the residual liquid after anoxic treatment: The residual liquid after anoxic treatment enters the aerobic tank for aerobic respiration to further decompose organic matter into inorganic matter.

[0062] The ninth step is secondary sedimentation of the residual liquid IV after aerobic treatment: The residual liquid IV after aerobic treatment enters the secondary sedimentation tank, and the heavier sludge particles are settled to the bottom of the tank by gravity sedimentation, thereby obtaining supernatant and sludge IV.

[0063] In the tenth step, chlorophyll is extracted from sludge 2 by methods including but not limited to acetone extraction; sludge 1, sludge 2 after chlorophyll extraction, sludge 3 and sludge 4 are dehydrated, and subsequent disposal includes use as organic fertilizer after harmless treatment and use as soil conditioner to improve soil structure.

[0064] The eleventh step is ozone oxidation treatment of the supernatant: the supernatant enters the ozone oxidation tower, into which ozone is added to sterilize and disinfect the supernatant and remove pollutants.

[0065] Step 12: Reprocessing of the supernatant after ozone oxidation: Reprocess the supernatant after ozone oxidation through artificial wetlands, and use the effluent as irrigation water for irrigating farmland.

[0066] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A process for harmless treatment of waste vegetable leaves, characterized in that: The following steps are involved: S1. Squeezing the discarded vegetable leaves: crushing the discarded vegetable leaves and squeezing them to obtain a discarded vegetable leaf residual liquid and a residue; S2. Residue resource utilization: Recycling the waste vegetable leaves; S3, residual liquid 1 coagulation and sedimentation: the residual liquid of the discarded vegetable leaves enters the coagulation and sedimentation tank, and a coagulant is added to the coagulation and sedimentation tank for coagulation and sedimentation to obtain residual liquid 2 and sludge 1; S4, hydrolysis and acidification of residual liquid II: the residual liquid II enters the hydrolysis and acidification tank for hydrolysis and acidification, and the macromolecular organic matter in the residual liquid II is decomposed into small molecular organic matter to obtain residual liquid III and sludge II; S5, residual liquid three is treated by the snail press: residual liquid three enters the snail press, and flocculants are added to the snail press at the same time. Air is introduced into the wastewater to generate tiny bubbles, and under the action of the flocculants, pollutants in residual liquid three are adhered to the bubbles, thereby obtaining residual liquid four and sludge three; S6. Anaerobic treatment of residual liquid IV: The residual liquid IV enters the anaerobic tank, where anaerobic bacteria are used to hydrolyze, acidify and methanize organic matter, remove organic matter from the wastewater, and improve the biodegradability of the wastewater; S7. Anoxic treatment of residual liquid after anaerobic treatment: The residual liquid after anaerobic treatment enters the anoxic tank to remove nitrate nitrogen through denitrification, and also remove part of the biological oxygen demand; S8, aerobic treatment of residual liquid after anoxic treatment: the residual liquid after anoxic treatment enters the aerobic tank, undergoes aerobic respiration to further decompose organic matter into inorganic matter; S9. Secondary sedimentation of residual liquid IV after aerobic treatment: The residual liquid IV after aerobic treatment enters the secondary sedimentation tank, and the heavier sludge particles are settled to the bottom of the tank by gravity sedimentation, thereby obtaining supernatant and sludge IV; S10, sludge treatment: dehydration and subsequent disposal of sludge 1, sludge 2, sludge 3 and sludge 4; S11, ozone oxidation treatment of the supernatant: the supernatant enters an ozone oxidation tower, and ozone is added to the ozone oxidation tower to sterilize and disinfect the supernatant and remove pollutants; S12. Reprocessing of the supernatant after ozone oxidation: The supernatant after ozone oxidation is reprocessed through artificial wetlands, and the effluent is used as irrigation water for irrigating farmland.

2. The harmless treatment process for discarded vegetable leaves according to claim 1, characterized in that: In the step S1, when the waste vegetable leaves are crushed, the waste vegetable leaves are crushed into waste vegetable leaf fragments of 3-10 mm.

3. The harmless treatment process for waste vegetable leaves according to claim 1 is characterized in that: In the step S1, when the crushed discarded vegetable leaves are squeezed, the squeezing pressure is 1.2Mpa-1.8Mpa.

4. The harmless treatment process for waste vegetable leaves according to claim 1 is characterized by: In the step S2, the method for resource utilization of the waste vegetable leaf residue includes: drying the waste vegetable leaf residue, controlling the moisture content of the dried vegetable leaf fragments to be between 10% and 15%; secondary crushing the dried vegetable leaf fragments, and sieving them with a 60-mesh sieve after crushing; packaging the sieved vegetable leaf powder to produce vegetable leaf feed powder; adding lignite, chicken manure, tobacco leaf powder and fermentation bacteria to the waste vegetable leaf residue, stirring and mixing them evenly, and then fermenting them in piles, turning the piles when the internal temperature of the fermentation pile rises to 65-70°C, and when the temperature of the fermented product drops to room temperature after turning the piles, fermenting them in piles again, and after three to five times of fermentation in piles, the fermented product is fully decomposed to be made into organic fertilizer.

5. The harmless treatment process for waste vegetable leaves according to claim 4 is characterized by: The contents of the waste vegetable residue, lignite, chicken manure, tobacco powder and fermentation bacteria in step S2 are 28-33 parts of waste vegetable residue, 27-38 parts of lignite, 32-43 parts of chicken manure, 7-12 parts of tobacco powder and 0.2-0.5 parts of fermentation bacteria in parts by weight.

6. The harmless treatment process for waste vegetable leaves according to claim 1, characterized in that: In step S3, the coagulant is one or more of aluminum sulfate, polyaluminum chloride, ferrous sulfate, ferric chloride and polyferric sulfate.

7. The harmless treatment process for waste vegetable leaves according to claim 1 is characterized by: In the step S5, the flocculant is one or more of a natural polymer modified flocculant, a synthetic polymer flocculant and a composite flocculant.

8. The harmless treatment process for waste vegetable leaves according to claim 1, characterized in that: In step S10, chlorophyll is extracted from sludge 2 by means of methods including but not limited to acetone extraction; sludge 1, sludge 2 after chlorophyll extraction, sludge 3 and sludge 4 are dehydrated, and subsequent disposal includes use as organic fertilizer after harmless treatment and use as soil conditioner to improve soil structure.

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