CN108558152B - Method for recycling river sediment - Google Patents
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- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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Abstract
The invention discloses a method for recycling river sediment, which comprises the following steps of taking the river sediment, and concentrating the river sediment in a concentration tank through gravity settling; conveying the concentrated bottom sludge to a hydrothermal closed reaction tank for hydrothermal reaction; after the hydrothermal reaction is finished, discharging the reaction mixed solution into a regulating tank after the temperature of the reaction mixed solution is reduced, adding CaO, and separating through dehydration treatment to obtain hydrothermal liquid and hydrothermal solid products; carrying out zero-valent iron Fenton reaction on the obtained hydrothermal solution, removing organic matters and heavy metals released into the hydrothermal solution in the hydrothermal process, and returning the treated water to the river water body; the obtained hydrothermal solid product is thrown into the river water again for adsorbing nitrogen, phosphorus and heavy metals in the water, and the hydrothermal solid product can enrich microorganisms and further purify the water. The method can realize the resource utilization of the bottom mud while treating the bottom mud of the river, has less generated waste and simple operation, and provides a feasible method for the resource utilization of the bottom mud of the river.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a method for recycling riverway bottom mud.
Background
In recent years, with the rapid development of industry, serious pollution occurs to water bodies such as riverways and lakes, pollutants enter the water bodies through ways such as atmospheric sedimentation, wastewater discharge, rainwater leaching and scouring, and a large amount of refractory pollutants are accumulated and gradually enriched in sediment of the water bodies. The bottom sludge mainly contains three types of pollutants, one is heavy metal, generally refers to Hg, As, Zn, Cu and the like, has the characteristics of difficult degradability, ecological toxicity, accumulativeness and the like, and can be deposited into the bottom sludge through the actions of precipitation, adsorption, complexation and the like; secondly, organic matters, namely toxic organic matters in the bottom mud reach higher concentration in organisms through enrichment so as to generate stronger toxic action on the organisms, and the toxic organic matters are migrated, converted and exposed in multi-medium environment systems such as gas-water-organism-bottom mud and the like so as to influence the health of people and animals; thirdly, nitrogen and phosphorus are nutrient substances, which easily causes eutrophication of water body. The concentration of pollutants dissolved in the water body is influenced by the bottom mud to a great extent, so that the treatment of the bottom mud, particularly the bottom mud of a river channel, plays an important role in improving the water environment. After ten items of water are released, urban black and odorous river regulation is developed all over the country, wherein river dredging is one of important means, and therefore regulation of polluted bottom mud is more gradual. In addition, because the bottom mud of the river channel contains organic matters with higher concentration, the dissolved oxygen in the water body can be seriously reduced, humus organic matters are formed in the bottom mud, odor is generated, and the living environment of residents is seriously influenced, so that the dredging treatment of the river channel with serious bottom mud deposition is very necessary, and the treatment and the resource utilization of the dredged bottom mud are key and difficult points at present.
At present, river sediment mainly focuses on reduction technology and application thereof, such as grading screening reduction, dehydration reduction and other technologies. Before dehydration treatment, alkaline substances such as lime and the like are often added into bottom mud, and the dehydration performance is improved through medicament conditioning, so that the dehydrated mud cake has high alkalinity and certain harm to soil, and is difficult to be used as garden and backfill (clean coal technology, 2015, 21 (6): 43-46.); in addition, the bottom mud is screened, organic matters in the bottom mud are removed, and the screened mud or mud cakes are used for building materials. At present, the research on the resource utilization of the river sediment is less, and the resource utilization direction needs to be further expanded.
Disclosure of Invention
The invention aims to solve the problems that: how to realize the resource utilization of the river sediment.
In order to solve the problems, the invention adopts the following technical scheme:
1. a method for recycling river sediment is characterized by comprising the following steps:
step 1): taking river sediment, and concentrating in a concentration tank by gravity settling, wherein the concentration of the concentrated sediment is 12-25 g/L;
step 2): conveying the concentrated bottom sludge to a hydrothermal closed reaction tank for hydrothermal reaction;
step 3): after the hydrothermal reaction is finished, discharging the reaction mixed solution into a regulating tank after the temperature of the reaction mixed solution is reduced, adding CaO, and separating through dehydration treatment to obtain hydrothermal liquid and hydrothermal solid products;
step 4): carrying out zero-valent iron Fenton reaction on the obtained hydrothermal solution, removing organic matters and heavy metals released into the hydrothermal solution in the hydrothermal process, and returning the treated water to the river water body; the obtained hydrothermal solid product is thrown into the river water again for adsorbing nitrogen, phosphorus and heavy metals in the water, and the hydrothermal solid product can enrich microorganisms and further purify the water.
Preferably, the injection amount of the bottom mud in the step 2) is 40-85% of the volume of the closed reaction tank; the heating mode adopts steam heating, heat conducting oil heating or electric heating.
Preferably, the heating temperature in the step 2) is 160-240 ℃, and the heating time is 0.5-5 h.
Preferably, after the reaction in the step 3) is finished, the temperature is reduced to below 60 ℃, and a plate-and-frame filter pressing or centrifugal dehydration mode is adopted as a dehydration mode.
Preferably, the hydrothermal solution in the step 4) is subjected to zero-valent iron Fenton, zero-valent iron is zero-valent iron powder, the initial adding amount is 3-15g/(L hydrothermal solution), and H with the mass fraction of 30% is added2O2The adding amount is 1-5mL/(L hydrothermal solution), and the initial pH value is adjusted to 3-5; reacting for 0.5-5h, adding NaOH to adjust the pH value to 8-10 after the reaction is finished, adding 0.5-2mg/(L hydrothermal solution) of polyacrylamide, performing coagulating sedimentation, returning supernatant to a river water body, and transporting the precipitated sludge outside.
Preferably, the aqueous-thermal solid product in the step 4) is added into the river water again, and all the aqueous-thermal solid product is uniformly added to the bottom of the river at the bottom mud source.
The invention provides a method capable of realizing the resource utilization of river sediment, which is characterized in that the river sediment is subjected to hydrothermal treatment, and an obtained hydrothermal solid product is returned to the bottom of a river channel and is used for adsorbing nitrogen, phosphorus and heavy metals in a river channel water body and can be loaded with microorganisms to further purify the river channel water body; the obtained hydrothermal solution is subjected to zero-valent iron Fenton treatment, organic matters and heavy metals are removed, and the hydrothermal solution is returned to the river channel water body, so that the resource utilization of the river channel bottom mud is realized.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention can realize the in-situ stabilization and harmless treatment of the river sediment;
(2) the invention can realize the resource utilization of the bottom mud of the river channel, the hydrothermal solid product obtained after the bottom mud is subjected to hydrothermal treatment can be returned to the river channel again, and the invention has a purification effect on the water body of the river channel and solves the problem of bottom mud disposal.
Drawings
Fig. 1 is a process schematic diagram of a method for resource utilization of river sediment provided by the invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Example 1
A method for recycling river sediment comprises the following steps:
(1) as shown in fig. 1, the river sediment produced by dredging the river is placed in a concentration tank for gravity settling concentration, and the concentration of the concentrated sediment is 15 g/L;
(2) pumping the concentrated bottom mud into a hydrothermal closed reaction tank, wherein the injection amount of the concentrated bottom mud is 50% of the volume of the reaction tank, heating in a steam heating mode in a closed manner until the temperature of the sludge in the tank is 180 ℃, and keeping the temperature for 120 min;
(3) conveying the cooled material to an adjusting tank, and performing centrifugal dehydration treatment to obtain hydrothermal liquid and hydrothermal solid products;
(4) the hydrothermal solution adopts zero-valent iron Fenton to remove organic matters and heavy metals, the addition amount of zero-valent iron powder is 4g/(L hydrothermal solution), and the mass fraction of H is 30%2O2The amount of (2) was 3mL/(L hydrothermal solution), the initial pH was adjusted to 4, and the reaction was carried out for 3 hours. After the reaction is finished, NaOH is added to adjust the pH value to 9, PAM 1mg/(L hydrothermal solution) is added for coagulating sedimentation, and the obtained treatmentThe supernatant of the post-effluent is returned to the original river channel, and the precipitated sludge is treated by outward transportation after being subjected to filter pressing and dehydration;
(5) and a hydrothermal solid product obtained after the bottom mud is hydrothermally added to the river channel for water purification.
Example 2
A method for recycling river sediment comprises the following steps:
(1) as shown in figure 1, sediment concentration is carried out on the dredging sediment in a concentration tank, and the concentration of the sediment after concentration is 20 g/L;
(2) pumping the concentrated bottom sludge into a high-pressure closed reaction tank, wherein the injection amount of the sludge is 70% of the volume of the high-pressure closed reaction tank, heating by adopting heat conduction oil, and hermetically heating until the temperature of the sludge in the tank is 180 ℃, and keeping for 160 min:
(3) after the reaction is finished, the material is discharged to an adjusting tank after being cooled, and is subjected to plate-and-frame filter pressing dehydration treatment to obtain hydrothermal solution and hydrothermal solid products.
(4) The hydrothermal solution adopts zero-valent iron Fenton to remove organic matters and heavy metals, the addition amount of zero-valent iron powder is 2g/(L hydrothermal solution), and the mass fraction of H is 30%2O2The amount of (2) was 4mL/(L hydrothermal solution), the initial pH was adjusted to 3, and the reaction was carried out for 2 hours. After the reaction is finished, NaOH is added to adjust the pH value to 8, PAM 1.5mg/(L hydrothermal solution) is added for coagulating sedimentation, the obtained treated effluent supernatant is returned to the original river channel, and the precipitated sludge is transported outside after being subjected to plate-and-frame filter pressing and dehydration;
(5) and a hydrothermal solid product obtained after the bottom mud is hydrothermally added to the river channel for water purification.
Example 3
A method for recycling river sediment comprises the following steps:
(1) as shown in fig. 1, putrefactive sediment obtained by dredging the river channel is pumped into a concentration tank for sediment concentration, and the concentration of the concentrated sediment is 20 g/L;
(2) pumping the concentrated sludge into a hydrothermal closed reaction tank, wherein the injection amount of the sludge is 80% of the volume of the carbonization reaction tank, heating the sludge in the tank by steam until the temperature of the sludge is 200 ℃, and keeping the temperature for 200 min;
(3) and (3) cooling after the reaction is finished, conveying the material to an adjusting tank, and performing filter pressing and dehydration treatment by adopting a plate frame to obtain hydrothermal liquid and hydrothermal solid products.
(4) The hydrothermal solution is treated by Fenton of zero-valent iron for removing organic matters and heavy metals, the addition amount of the zero-valent iron powder is 4g/(L hydrothermal solution), and the mass fraction of the zero-valent iron powder is 30% of H2O2The amount of (2) was 3mL/(L hydrothermal solution), the initial pH was adjusted to 5, and the reaction was carried out for 3 hours. After the reaction is finished, NaOH is added to adjust the pH value to 9, PAM 1mg/(L hydrothermal solution) is added for coagulating sedimentation, the obtained treated effluent supernatant is returned to the original river channel, and the precipitated sludge is transported outside after being subjected to plate-and-frame filter pressing and dehydration;
(5) and a hydrothermal solid product obtained after the bottom mud is hydrothermally added to the river channel for water purification.
Example 4
A method for recycling river sediment comprises the following steps:
(1) as shown in figure 1, pumping the desilted bottom sludge of the river channel into a concentration tank for gravity settling concentration, wherein the concentration of the concentrated bottom sludge is 22 g/L;
(2) pumping the concentrated sludge into a hydrothermal closed reaction tank, wherein the injection amount of the sludge is 85% of the volume of the carbonization reaction tank, heating the steam until the temperature of the sludge in the tank is 190 ℃, and keeping the temperature for 240 min;
(3) and after the reaction is finished, conveying the materials in the tank to an adjusting tank after the temperature of the materials is reduced, and performing filter pressing and dehydration treatment by adopting a plate frame to obtain hydrothermal solution and hydrothermal solid products.
(4) The hydrothermal solution is treated by Fenton of zero-valent iron for removing organic matters and heavy metals, the addition amount of the zero-valent iron powder is 5g/(L hydrothermal solution), and the mass fraction of the zero-valent iron powder is 30% of H2O2The amount of (2) was 4mL/(L hydrothermal solution), the initial pH was adjusted to 3, and the reaction was carried out for 3.5 hours. After the reaction is finished, NaOH is added to adjust the pH value to 8.5, PAM 2mg/(L hydrothermal solution) is added for coagulating sedimentation, the obtained treated effluent supernatant is returned to the original river channel, and the precipitated sludge is transported outside after being subjected to plate-and-frame filter pressing and dehydration;
(5) and a hydrothermal solid product obtained after the bottom mud is hydrothermally added to the river channel for water purification.
Claims (5)
1. A method for recycling river sediment is characterized by comprising the following steps:
step 1): taking river sediment, and concentrating in a concentration tank by gravity settling, wherein the concentration of the concentrated sediment is 12-25 g/L;
step 2): conveying the concentrated bottom sludge to a hydrothermal closed reaction tank for hydrothermal reaction;
step 3): after the hydrothermal reaction is finished, discharging the reaction mixed solution into a regulating tank after the temperature of the reaction mixed solution is reduced, adding CaO, and separating through dehydration treatment to obtain hydrothermal liquid and hydrothermal solid products;
step 4): carrying out zero-valent iron Fenton reaction on the obtained hydrothermal solution, removing organic matters and heavy metals released into the hydrothermal solution in the hydrothermal process, and returning the treated water to the river water body; the obtained hydrothermal solid product is thrown into the river water again for adsorbing nitrogen, phosphorus and heavy metals in the water, and the hydrothermal solid product can enrich microorganisms and further purify the water; performing Fenton of zero-valent iron by hydrothermal solution, wherein zero-valent iron is zero-valent iron powder, the initial adding amount is 3-15g/(L hydrothermal solution), and H with the mass fraction of 30% is added2O2The adding amount is 1-5mL/(L hydrothermal solution), and the initial pH value is adjusted to 3-5; reacting for 0.5-5h, adding NaOH to adjust the pH value to 8-10 after the reaction is finished, adding 0.5-2mg/(L hydrothermal solution) of polyacrylamide, performing coagulating sedimentation, returning supernatant to a river water body, and transporting the precipitated sludge outside.
2. The method for recycling the river sediment according to claim 1, wherein the injection amount of the sediment in the step 2) is 40-85% of the volume of the closed reaction tank; the heating mode adopts steam heating, heat conducting oil heating or electric heating.
3. The method as claimed in claim 1, wherein the heating temperature in step 2) is 160-240 ℃, and the heating time is 0.5-5 h.
4. The method for resource utilization of the river sediment according to claim 1, wherein the temperature is reduced to below 60 ℃ after the reaction in the step 3), and the dehydration mode adopts a plate-and-frame filter pressing or centrifugal dehydration mode.
5. The method for recycling the bottom mud of the river channel according to claim 1, wherein the aqueous and solid products in the step 4) are re-fed into the water body of the river channel and are all uniformly fed to the bottom of the river channel at the bottom mud source.
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| CN109279747B (en) * | 2018-11-27 | 2021-06-04 | 东华大学 | Method for enhancing resistance gene of excess sludge hydrothermal reduction by using zero-valent iron |
| CN109665614A (en) * | 2019-01-25 | 2019-04-23 | 东华大学 | A kind of dyeing waste water biological carbon filter saturation filler functionalization reuse method |
| CN111661915B (en) * | 2020-06-12 | 2022-02-22 | 广州市广绿园林绿化有限公司 | Wetland ecosystem restoration method |
| CN112427019A (en) * | 2020-08-11 | 2021-03-02 | 广西大学 | Anaerobic granular sludge loaded vulcanized nano zero-valent iron adsorbing material and preparation method and application thereof |
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| CN105540931A (en) * | 2016-01-19 | 2016-05-04 | 东华大学 | Multi-component composite catalytic zero-valent iron Fenton treatment method and device for industrial wastewater |
| CN106630513A (en) * | 2017-01-05 | 2017-05-10 | 新疆弘瑞达纤维有限公司 | Novel sludge pretreating method |
| EP3243801A1 (en) * | 2016-05-11 | 2017-11-15 | Fachhochschule Nordwestschweiz Institut für Biomass and Ressource Efficiency | Method for the oxidation of organic sludges in cyclic batch mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105540931A (en) * | 2016-01-19 | 2016-05-04 | 东华大学 | Multi-component composite catalytic zero-valent iron Fenton treatment method and device for industrial wastewater |
| EP3243801A1 (en) * | 2016-05-11 | 2017-11-15 | Fachhochschule Nordwestschweiz Institut für Biomass and Ressource Efficiency | Method for the oxidation of organic sludges in cyclic batch mode |
| CN106630513A (en) * | 2017-01-05 | 2017-05-10 | 新疆弘瑞达纤维有限公司 | Novel sludge pretreating method |
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