CN114700034A - Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof - Google Patents

Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof Download PDF

Info

Publication number
CN114700034A
CN114700034A CN202011419893.5A CN202011419893A CN114700034A CN 114700034 A CN114700034 A CN 114700034A CN 202011419893 A CN202011419893 A CN 202011419893A CN 114700034 A CN114700034 A CN 114700034A
Authority
CN
China
Prior art keywords
sediment
ammonia nitrogen
clay
lake
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011419893.5A
Other languages
Chinese (zh)
Inventor
金位栋
杨苏文
王贝贝
焦立新
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chinese Research Academy of Environmental Sciences
Original Assignee
Chinese Research Academy of Environmental Sciences
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chinese Research Academy of Environmental Sciences filed Critical Chinese Research Academy of Environmental Sciences
Priority to CN202011419893.5A priority Critical patent/CN114700034A/en
Publication of CN114700034A publication Critical patent/CN114700034A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C02F11/20—Treatment of sludge; Devices therefor by thermal conditioning by freezing

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The invention relates to a nitrogen-controlling and aquatic plant habitat restoration material prepared on the basis of lake (lake swinging) and river high-nutrient salt release bottom mud, and a preparation method and application thereof. The repairing material is derived from the natural sediment, so that the material is cheap to obtain, the safety is high, no ecological risk is caused to lake (lake oscillation) and river water bodies, and the sediment is roasted and modified at high temperature to have the characteristics of strong ammonia nitrogen adsorption capacity, weaker desorption and improvement on the habitat of the aquatic plant, so that the problems of high cost, poor ecological safety and limited ammonia nitrogen controlled-release effect of the ammonia nitrogen controlled-release material in the prior art can be solved, and the repairing material has a good effect on the habitat improvement of the aquatic plant.

Description

Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of ammonia nitrogen release resistance control of lake and river sediment and aquatic plant habitat improvement, and particularly relates to a sediment/clay nitrogen control and aquatic plant habitat restoration material prepared based on lake sediment, and a preparation method and application thereof.
Background
The eutrophication of water is a phenomenon of water pollution caused by excessive content of nutrient salt elements such as nitrogen, phosphorus and the like in the water. The source of the nutritive salt contained in the water body mainly has two aspects: exogenous contamination on the one hand and endogenous contamination on the other hand. Exogenous pollution, namely domestic sewage of residents in the watershed, production wastewater of industrial enterprises and nutrient salt substances in the production wastewater of the animal husbandry and breeding industry enter water bodies of rivers and lakes to cause eutrophication of the water bodies; with the attention of the central country and governments of various levels, exogenous pollution is primarily controlled. Endogenous pollution, namely, a large amount of nutrient salt substances accumulated in the bottom mud in rivers and lakes are slowly released into a water body, so that the phenomenon that the content of nutrient salt in the water body is too high is caused. At present, the endogenous pollution is the main reason for frequent occurrence of eutrophication phenomena in rivers and lakes. The sediment releases nitrogen, particularly ammonia nitrogen is an important source of nitrogen of overlying water of the eutrophic lake, so that the control on the ammonia nitrogen release of the sediment of the eutrophic shallow lake is particularly important.
At present, the heterotopic treatment technology and the in-situ treatment technology are mainly adopted to inhibit the release of nutritive salt in the bottom sediment. The ectopic treatment technology mainly refers to a sediment dredging technology and a treatment technology after sediment dredging, namely pollutants on the surface layer of the sediment in a lake are excavated out by a hydraulic or mechanical method to be transferred and transported, so that the release of pollutants in the sediment is reduced, but if the measures adopted in the dredging process are improper, such as improper excavation depth control, the pollutants in the deep layer are released into a water body, and the original nitrogen salt dissolution balance in the water body and the sediment is broken; meanwhile, the dredging process can also cause certain influence on the original water ecosystem in the lake water body environment and destroy the living environment of benthos; and the sediment is dredged and treated, which also needs high capital and the cost of treatment is expensive.
The in-situ treatment technology is used for repairing polluted sediments in original places without transporting or carrying the polluted sediments under the condition of basically not damaging the natural environment of the sediment in the water body; the in-situ treatment technology has lower investment cost, can directly and artificially add some specific biological agents or passivating materials which are not easy to erode by water to inhibit the release of nutrient salt substances in sediments, can realize the purpose of water purification without cleaning bottom mud in rivers, and has little influence on the surrounding environment.
The in-situ treatment technology mainly comprises a physical technology, a chemical technology and a biological treatment technology. The physical technology is to eliminate the pollutants in the sediment by means of engineering technology, and comprises an in-situ covering technology and a manual aeration technology. In-situ covering technology, a clean covering is put on the surface of the polluted sediment to prevent the pollutant in the sediment from being released into the water body, and the covering material used in the technology is large in amount and clean, so the source of the covering material is difficult; meanwhile, when the material is covered on the spot, the uniformity of the material spread on the surface of the sediment is difficult to ensure, and the material can be easily eroded under the condition of faster water flow; in addition, the covering material can increase the thickness of the bottom mud in the lake, reduce the depth of the water body and cause certain damage to the benthic ecosystem. Chemical technology, i.e. removing the pollutants in the sediment by means of chemical agents, comprises chemical passivation technology and chemical oxygen increasing technology. The problem of chemical ecological safety can exist in the process of using chemical agents, the chemical agents are put into the water body to greatly affect organisms in the water body, the public can not accept the chemical agents easily, and meanwhile, the secondary pollution of the water body is easily caused. The biological treatment technology is to degrade pollutants and sediments in the water body by using organisms and plants, animals and microorganisms, so as to reduce the release of nutritive salt substances in the sediments into the water body, and comprises an animal and plant restoration technology, a microorganism restoration technology and an ecological restoration technology.
Aiming at the problems, the adsorption technology is tried to control the release of nutritive salt at a sediment-water interface in the eutrophic shallow lake at present, because the adsorption technology has the advantages of simple and convenient operation, rapidness, high efficiency, no secondary pollution, capability of repeatedly utilizing the adsorbent and the like.
In a chinese patent document CN102674646, a technical method for in-situ remediation of sediment contamination in surface water is disclosed, which comprises injecting a certain amount of nitrate into the contaminated sediment in a lake, removing organic pollutants in the sediment by using the nitrate, and simultaneously placing zeolite containing natural zeolite and modified by cationic surfactant into the sediment-water interface in the lake to form a thin active covering layer, thereby inhibiting the release of nitrogen elements in the sediment, and simultaneously inhibiting the release of nitrate contained in water in the pores of the sediment into the overlying water, and reducing the possibility of nitrate contamination in the overlying water. In an experiment for analyzing adsorption-desorption of nitrogen and phosphorus nutrient salt elements in bottom mud in a Taihu lake, Jiangxia (2011) and other people of China institute of environmental science and research show that: the average adsorption capacity of the sediment in the lake Taihu to ammonia nitrogen is 23.55mg/kg, and the adsorption capacity to ammonia nitrogen is more in the area with serious pollution, so that the sediment in the lake has certain adsorption capacity to ammonia nitrogen substances. Chinese patent document CN104437374A discloses a method for preparing an adsorbent by using sediments in yunnan lake and a use condition thereof. In the invention, Ningping et al use glutaraldehyde solution and other chemical agents to carry out chemical treatment on pretreated lake sediment, and then prepare the sediment adsorbent after a series of operations such as water bath heating, hydrochloric acid acidification, filtering and washing, high-temperature carbonization, drying, grinding and sieving, and the like, so that the adsorbent greatly improves the adsorption of manganese in water; the test result of the invention shows that the adsorbent prepared by using the sediments in the lake not only has good adsorption effect, but also has lower cost, and is energy-saving and environment-friendly. The above studies indicate that the bottom mud in rivers and lakes can be used in-situ covering technology. Summer buds (2017) and other people of the university of Chengdu theory of engineering respectively research the control effect of phosphorus element release in bottom mud when different natural materials (laterite, calcite, kaolin and bentonite) and different functional soils (laterite modified by four chemical agents, namely potassium permanganate, hydrogen peroxide, calcium nitrate and ferric trichloride) are covered in situ under a static condition and the control effect of phosphorus element release in sediment when the natural laterite is covered in situ under a dynamic condition, and research results show that the release of nutrient salt in the bottom mud can be controlled when the functional soil is covered in situ.
In the prior art, nitrogen control and aquatic plant habitat improvement and restoration materials prepared by taking sediments as raw materials do not exist. Therefore, the invention provides a nitrogen-controlling and aquatic plant habitat restoration material prepared on the basis of lake (lake swing) and river high-nutrient salt release bottom mud, a preparation method and application thereof, the purpose of treating wastes with wastes is achieved, the cost is reduced, the prepared nitrogen-controlling material is high in safety, the adsorption and control effects on ammonia nitrogen are excellent, no ecological risk is caused to lake water, and meanwhile, a good effect is achieved on aquatic plant habitat improvement.
Disclosure of Invention
Therefore, the technical problems to be solved by the invention are that the ammonia nitrogen release and control material in the prior art is high in cost, poor in ecological safety and limited in ammonia nitrogen controlled release effect, and simultaneously improves the habitat environment of aquatic plants, so that a sediment/clay nitrogen control and aquatic plant habitat restoration material prepared based on lake sediment, which is low in price, green, high in ecological safety and strong in ammonia nitrogen controlled release effect, and a preparation method and application thereof are provided.
In order to solve the technical problems, the invention provides a preparation method of a nitrogen-controlling and aquatic plant habitat restoration material, which comprises the following steps:
(1) collecting bottom mud on the surface layer of the water body, freeze-drying and grinding for later use;
(2) carrying out constant-temperature heating treatment on the bottom mud treated in the step (1), and cooling to obtain sediment powder;
(3) and (3) mixing the ground clay with the sediment powder obtained in the step (2), adding water for infiltration, heating at constant temperature after shaping, and cooling to obtain the repair material.
In some embodiments, the mass ratio of the deposits in the repair material is 30% to 60%, preferably 40% to 50%.
In some embodiments, the shape of the repair material is spherical, sheet, cubic, or rectangular parallelepiped.
In some embodiments, in step (1), the substrate sludge is ground and passed through a 50-150 mesh screen, preferably, the substrate sludge is ground and passed through a 100 mesh screen.
In some embodiments, in step (3), the clay is ground and passed through a 50-150 mesh screen, preferably, the clay is ground and passed through a 100 mesh screen.
In some embodiments, the constant temperature heating in step (1) and step (3) is at 550-650 ℃ (e.g., 580 ℃, 600 ℃, or 620 ℃), and the constant temperature heating treatment is for 1.5-2.5 hours, e.g., 2 hours.
In some embodiments, the amount of water added is 20% to 25% by weight of the combined clay and sediment materials.
In some embodiments, the body of water is a lake or river.
The invention also provides the nitrogen-controlling and aquatic plant habitat restoration material prepared by the preparation method.
The invention also provides application of the nitrogen-controlling and aquatic plant habitat restoration material in ammonia nitrogen adsorption and aquatic plant habitat restoration.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) the repair material provided by the invention uses lake (lake swing) and river sediment as raw materials to achieve the purpose of treating wastes with wastes, is energy-saving and environment-friendly, and solves the problems of high cost, poor ecological safety and limited ammonia nitrogen controlled release effect of the ammonia nitrogen controlled release material in the prior art;
(2) the material prepared by the method for preparing the sediment/clay nitrogen control and aquatic plant habitat restoration material based on lake (lake swing) and river sediment has obvious ammonia nitrogen adsorption amount and lower ammonia nitrogen desorption amount, so that the restoration material can be widely applied to the field of preparing ammonia nitrogen adsorption materials, particularly to the application of the sediment-water interface ammonia nitrogen release prevention and control material;
(3) the material prepared by the method for preparing the sediment/clay nitrogen control and aquatic plant habitat restoration material based on lake (lake swing) and river sediment has good improvement effect on the aquatic plant habitat, and is beneficial to restoration of an aquatic ecosystem.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a graph of adsorption isotherms of sediment/clay remediation materials of different ratios for ammonia nitrogen of different concentrations in an experimental example of the present invention;
FIG. 2 is a graph showing the maximum adsorption amount of the sediment/clay remediation material with different ratios to ammonia nitrogen in the experimental example of the present invention;
FIG. 3 is a graph of equilibrium concentration of different ratios of sediment/clay remediation materials on ammonia nitrogen adsorption-desorption in an experimental example of the present invention;
FIG. 4 is a graph of the separation factor RL for the sediment/clay remediation material as a function of initial concentration of adsorbate in an experimental example of the invention;
FIG. 5 is a comparison of the growth state of the aquatic plant watermifoil in the experimental examples of the present invention;
wherein A is a plant in the experimental group B, is 19cm long,
b is a plant in the experimental group D, which is 23cm long,
c is sediment/zeolite repair material + plants in the plant group of comparative example, 15cm long;
FIG. 6 is a graph showing the change of ammonia nitrogen content in overburden water of 4 experimental groups in the experimental example of the present invention;
FIG. 7 is a graph showing the change in ammonia nitrogen content in the overlying water of 4 experimental groups in the comparative example of the present invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The lake sediment used in the following examples is collected in the surface layer (0-15cm) of an area (31.6007 degrees N; 120.5141 degrees E) with serious swing staining and less aquatic plant growth in the 7-month winding mountain in 2019, and the total nitrogen content of the lake sediment is more than 1500 mg/kg.
Example 1
The embodiment generally provides a method for preparing sediment/zeolite nitrogen control material by using lake sediment, which comprises the following steps:
(1) collecting bottom sediment on the surface layer of the lake, freezing, drying, grinding and sieving with a 50-mesh sieve for later use;
(2) carrying out constant-temperature heating treatment on the bottom mud treated in the step (1), and cooling to obtain sediment powder, wherein the constant-temperature heating temperature is 550 ℃, and the constant-temperature heating treatment time is 2.5 hours;
(3) and (3) mixing the ground clay and the sediment powder obtained in the step (2), adding water for infiltration, extruding into a ball shape with the diameter of 1cm, heating at a constant temperature, and cooling to obtain the repair material, wherein the ground clay is sieved by a 50-mesh sieve, the added water accounts for 20% of the weight of the mixed raw materials of the clay and the sediment, the constant-temperature heating temperature is 550 ℃, the constant-temperature heating time is 2.5 hours, and the mass ratio of the sediment in the repair material is 30%.
Example 2
The embodiment generally provides a method for preparing sediment/zeolite nitrogen control material by using lake sediment, which comprises the following steps:
(1) collecting bottom mud on the surface layer of the lake, freezing, drying, grinding and sieving by a 100-mesh sieve for later use;
(2) carrying out constant-temperature heating treatment on the bottom mud treated in the step (1), and cooling to obtain sediment powder, wherein the constant-temperature heating temperature is 600 ℃, and the constant-temperature heating treatment time is 2 hours;
(3) and (3) mixing the ground clay and the sediment powder obtained in the step (2), adding water for infiltration, shaping the mixture into a cube with the side length of 1cm by using a mould, heating the mixture at a constant temperature, and cooling the mixture to obtain the repair material, wherein the ground clay is sieved by a 100-mesh sieve, the added water accounts for 25% of the weight of the mixed raw materials of the clay and the sediment, the constant-temperature heating temperature is 600 ℃, the constant-temperature heating time is 2 hours, and the mass ratio of the sediment in the repair material is 60%.
Example 3
The embodiment generally provides a method for preparing sediment/zeolite nitrogen control material by using lake sediment, which comprises the following steps:
(1) collecting bottom mud on the surface layer of the lake, freezing, drying, grinding and sieving with a 150-mesh sieve for later use;
(2) carrying out constant-temperature heating treatment on the bottom mud treated in the step (1), and cooling to obtain sediment powder, wherein the constant-temperature heating temperature is 650 ℃, and the constant-temperature heating treatment time is 1.5 hours;
(3) and (3) mixing the ground clay and the sediment powder obtained in the step (2), adding water for infiltration, shaping the mixture into a cube with the side length of 1cm by using a mould, heating the mixture at a constant temperature, and cooling the mixture to obtain the repair material, wherein the ground clay is sieved by a 150-mesh sieve, the added water accounts for 25% of the weight of the mixed raw materials of the clay and the sediment, the constant-temperature heating temperature is 650 ℃, the constant-temperature heating time is 1.5 hours, and the mass ratio of the sediment in the repair material is 50%.
Examples of the experiments
The experimental example investigates the influence of the sediment/clay repairing material prepared based on the lake sediment on the maximum ammonia nitrogen adsorption amount, the adsorption-desorption equilibrium concentration and the growth of submerged plants, and the nitrogen control effect of the repairing material and the submerged plants on the sediment under the combined action.
Materials (I) and (II)
Freeze-drying the collected substrate sludge of the Asaham, and grinding the substrate sludge through a 100-mesh sieve to obtain sediment powder with the particle size of 100 meshes for later use; purchasing clay powder with the grain size of 100 meshes from a factory for later use; placing the sediment powder into a muffle furnace for constant-temperature roasting treatment, wherein the heating temperature is 600 ℃, the heating time is 2 hours, and then cooling the sediment powder in a dryer to reduce the indoor temperature for later use; then, respectively mixing the sediment powder and the clay powder according to a certain proportion to prepare a sample, wherein the sediment powder in the sample respectively accounts for 0%, 20%, 30%, 35%, 40%, 45%, 50%, 70%, 90% and 100% of the total mass of the sample; adding water for infiltration after mixing, manufacturing a square block-shaped modified material with the diameter of 1cm by using a die, placing the modified material into a muffle furnace for constant-temperature roasting treatment at the roasting temperature of 600 ℃ for 2h, and obtaining the repair material after roasting.
Weighing 3.8190g of ammonium chloride (NH) dried at 100-105 ℃ for 2h4Cl, super pure) is dissolved in ammonia-free water, the volume is fixed to 1000ml, each ml of the solution contains one milligram of ammonia nitrogen, and 0, 0.1, 0.4, 0.7, 0.9, 1.2, 1.5, 1.8, 2, 4, 8, 15, 30, 50, 80, 120, 170, 200, 250 and 300mg/L ammonia nitrogen solution is prepared according to the experiment requirements for later use.
Second, Experimental methods
1. Evaluation of ammonia nitrogen adsorption performance of sediment/clay repairing material prepared based on lake sediment
Through a high-concentration ammonia nitrogen adsorption thermodynamic experiment, the influence of the sediment/clay repairing material prepared based on the lake sediment on the maximum ammonia nitrogen adsorption amount is simulated. The method comprises the following specific steps:
respectively weighing 0.5g of the sample prepared in the previous step into a 100mL centrifuge tube, and respectively adding 50mL of NH with different concentration series prepared in the previous step4And (3) placing the Cl solution into a constant temperature oscillator, oscillating at 25 ℃ and 200rpm for 4h, then taking out a centrifuge tube, centrifuging for 15min at 5000r/min, filtering through a 0.45-micron filter membrane, taking supernatant, and measuring the ammonia nitrogen concentration by adopting a nano-grade reagent spectrophotometry.
The thermodynamic curve of the sediment/clay repairing material prepared based on the lake sediment is obtained through experimental data calculation, as shown in figure 1, and the maximum adsorption capacity of the sediment/clay repairing material to ammonia nitrogen at different heat treatment temperatures is obtained through Langmuir model fitting operation, as shown in figure 2. Wherein the Langmuir equation is as follows:
Q＝Qmax×C/(Kd+C)
in the formula: q is ammonia nitrogen equilibrium adsorption capacity mg/kg of the sample; qmaxMaximum adsorption amount mg/kg; c is ammonia nitrogen concentration of the equilibrium solution, mg/L.
2. Evaluation of adsorption-desorption characteristics of sediment/clay remediation material prepared based on lake sediment on ammonia nitrogen
The influence of the sediment/clay repairing material prepared based on the lake sediment on ammonia nitrogen adsorption-desorption parameters is simulated through a low-concentration ammonia nitrogen adsorption thermodynamics experiment.
The method comprises the following specific steps:
respectively weighing 0.5g of the sediment/clay composite materials with different ratios into a 100mL centrifuge tube, and respectively adding 50mL of NH with different concentration series4And (3) placing the Cl solution into a constant temperature oscillator, oscillating at 25 ℃ and 200rpm for 4h, then taking out a centrifuge tube, centrifuging for 15min at 5000r/min, filtering through a 0.45-micron filter membrane, taking supernatant, and measuring the ammonia nitrogen concentration by adopting a nano-grade reagent spectrophotometry.
Through experimental data calculation, the ammonia nitrogen adsorption-desorption equilibrium concentrations of the repair materials with different proportions are obtained by utilizing the fitting operation of a linear distribution model, as shown in figure 3. Wherein the linear equation is as follows:
Q＝a+b*C
ENC0＝(-a)/b
q is ammonia nitrogen equilibrium adsorption amount mg/kg of a sample; c is the ammonia nitrogen concentration of the equilibrium solution, mg/L; ENC0Is the adsorption-desorption equilibrium concentration.
3. Sediment/clay repairing material separation factor R prepared based on lake sedimentLIs calculated by
By the pair of separation factors RLThe calculation of (2) can judge whether the repairing material in the experiment can effectively adsorb pollutants in water. The formula for the separation factor is as follows:
RL＝1/(1+KLC0)
in the formula:
RL-separating the factor;
KLstrength of the adsorption surfaceConstant (L/mg);
C0-the initial concentration of ammonia nitrogen (mg/L) in the solution;
RLthe value of (A) is influenced by the change in the initial concentration of adsorbate, when 0 < RLWhen < 1, R is favorable for adsorptionLUnfavorable adsorption when the molecular weight is more than 1, RLWhen 1, R is linear adsorptionLWhen 0, the adsorption is irreversible adsorption.
R of sediment/clay remediation materialLThe change with initial concentration of adsorbate is shown in figure 4. 4. Influence of sediment/clay repairing material prepared based on lake sediment on growth of submerged plants and nitrogen control effect of material and submerged plants on sediment under combined action
Four experimental groups are designed, and a common glass fish tank of 40cm multiplied by 40cm is used as an experimental device, so that oxygen is enriched naturally, and the temperature is natural. After the aquatic animal and plant residues are screened off from the collected fresh bottom mud, the collected fresh bottom mud is slowly and uniformly mixed and uniformly added to the bottom of the glass fish tank, so that the thickness of the glass fish tank is 15 cm. The experimental group A is a blank group, and only bottom mud is put at the bottom of a common glass fish tank; the experimental group B is a plant group, and the watermifoil is planted at the bottom of the common glass fish tank after the bottom mud is put in the common glass fish tank; the experimental group C is a sediment/clay repairing material group, after bottom mud is placed at the bottom of the fish tank, a layer of sediment/clay repairing material is uniformly covered on the bottom mud, and the thickness of the material is 3 cm; the experimental group D is a sediment/clay repairing material + plant group, a layer of sediment/clay repairing material is uniformly covered on the sediment at the bottom of the fish tank, then submerged plant watermifoil with certain density is planted on the sediment, and 25 watermifoil plants are planted in each fish tank of the experimental group. After adding the bottom mud, the sediment/clay repairing material and the plants, in order to avoid disturbance, the lake water which is filtered by the filter membrane and flows around the mountain and sways the lake is slowly injected into the glass fish tank by a siphon method, the plants can be submerged by the upper covering water, and finally the upper covering water is injected to a position of which the liquid level is 5cm away from the edge of the opening of the fish tank. The method comprises the steps of adding water into a fish tank for stabilization, then starting sampling, taking a water sample at a position 5cm below the surface of an overlying water every day by utilizing a siphoning mode in an early stage of an experiment, taking about 100ml, measuring ammonia nitrogen indexes in the overlying water, taking the water sample every two days after the experiment is carried out to the fifth day, taking the water sample every two days after the experiment is carried out, taking the sample every two days along with the re-planning of the experiment, three days, five days, eight days. Through detecting water quality indexes, observing the change condition of the content concentration of nutrient salt in overlying water and the growth state change condition of the submerged plant myriophyllum pratense under the condition of adding or not adding sediment/clay repairing materials; the myriophyllum pratense used in the experimental fish tank is a healthy top branch with the length of 10 centimeters which is cut after being pre-cultured in a laboratory. The plant length measurements are shown in FIG. 5.
Two replicates were set up for each experimental group and the data values for the nutrient salt index content in the overlying water were expressed as mean values, as shown in figure 6.
The inhibition rate of the release of nutritive salts from the sediment was calculated as follows, as shown in table 1:
h＝(C0-Ci)×100％/C0
in the formula:
h-inhibition of nutrient salt release in sediment;
C0the concentration (mg/L) of nutrient salt in overlying water in the blank experiment fish tank;
Cithe nutrient salt concentration (mg/L) in the overlying water in the experimental fish tank covered by the repairing material or covered by the sediment/clay repairing material and planted with the submerged plant.
TABLE 1 Ammonia Nitrogen removal in the 4 experimental groups of the experimental examples
Figure BDA0002820897510000101
Figure BDA0002820897510000111
Third, experimental results
Evaluation result on ammonia nitrogen adsorption performance
The maximum adsorption capacity of the clay material to ammonia nitrogen is 750mg/kg when the sediment mass is 100%, the maximum adsorption capacity of the clay material to ammonia nitrogen is 1700mg/kg when the clay mass is 100%, and the adsorption performance of the natural clay material to ammonia nitrogen is higher than the ammonia nitrogen adsorption capacity of natural sediment; the maximum adsorption capacity of the sediment/clay repair material to ammonia nitrogen in a ratio of 1: 1 is 1800 mg/kg.
Evaluation results of adsorption-desorption characteristics for Ammonia Nitrogen
When the sediment mass is 100%, the adsorption-desorption equilibrium concentration is-1.98 mg/L, when the clay mass is 100%, the ammonia nitrogen adsorption-desorption equilibrium concentration is-0.31 mg/L, the adsorption-desorption equilibrium point of the pure sediment material to ammonia nitrogen is lower than that of a natural clay material, and the desorption capacity is lower; the equilibrium concentration of the sediment/clay repair material adsorption-desorption in the ratio of 1: 1 is-0.51 mg/L.
Separation factor RLResult of calculation of (2)
The separation factor of the sediment/clay remediation material is between 0 and 1, and the value of the separation factor is reduced along with the increase of the initial concentration of the adsorbate, which indicates that the sediment/clay remediation material is favorable for adsorbing the pollutants in the water body.
Optimum proportioning result of sediment/clay repairing material
Along with the increase of the proportion of the clay in the quality of the repair material, the numerical change of the maximum adsorption quantity of the ammonia nitrogen approximately presents a curve trend similar to M, the numerical change of the adsorption-desorption equilibrium point of the ammonia nitrogen approximately presents a curve trend similar to W, and the maximum adsorption quantity of the ammonia nitrogen exactly corresponds to the minimum adsorption-desorption equilibrium point of the ammonia nitrogen. Therefore, the optimal mixture ratio of the repairing material with high adsorption capacity and low desorption capacity to 50 percent of clay and 50 percent of sediment can be selected.
Influence on the growth of submerged plants and nitrogen control effect on the bottom mud under the combined action of the material and the submerged plants
The experimental results show that: the plants in the experimental fish tank without any repair material are good in growth state in the early stage of the experiment, have a certain growth amount, and are blackened and faded in the later stage of the experiment; the growth state of plants in the experimental fish tank of the sediment/clay repairing material group is good, and excessive spirogyra-like substances do not exist on the surface of the overlying water; at the end of the experiment, the plant heights of the foxtail algae plants in the experimental aquarium of the plant group, the sediment/clay repairing material and the plant group are respectively 19cm and 23cm, and are respectively increased by 9cm and 13cm compared with the plants at the initial stage of the experiment. The experimental result shows that the sediment/clay repairing material does not cause adverse effect on the growth of the submerged plant watermifoil and has a certain promotion effect.
The ammonia nitrogen in the overlying water in the sediment/clay remediation material group fish tank is increased in a fluctuating manner, the fluctuation range is large, the ammonia nitrogen starts to decline when the experiment is carried out for 15 days, the increase trend of the ammonia nitrogen content tends to be gentle about 31 days, and the removal rate of the ammonia nitrogen is 41.94% at 41 days; the content of ammonia nitrogen in the sediment/clay repair material and overlying water in the aquarium of the plant group is increased in a fluctuating manner at the earlier stage, but the fluctuation range is small, the trend of decline starts to appear when the experiment is carried out to the 10 th day, the trend of decline gradually slows down at the 16 th day, the trend hardly changes at about 31 th day, and the removal rate of ammonia nitrogen is 55.01% at the 41 th day. The result shows that the sediment/clay repairing material has obvious effect on inhibiting the release of ammonia nitrogen, the repairing material is beneficial to improving the habitat of aquatic plants, and the nitrogen control effect is better than that of pure plants or pure covering materials under the synergistic effect of the sediment/clay repairing material and the repairing material.
Comparative example 1
The sediment/zeolite nitrogen control material is prepared according to the method previously proposed by the applicant (see CN106006814), the influence of the sediment/zeolite nitrogen control material on the growth of the submerged plant and the nitrogen control effect of the sediment under the combined action of the sediment/zeolite nitrogen control material and the submerged plant are analyzed by the same experimental method, and four experimental groups are designed in total, namely a blank group, a plant group, a sediment/zeolite repair material group and a sediment/zeolite repair material + plant group.
The results are as follows:
the height of the foxtail algae plant in the sediment/zeolite repair material + plant group experimental fish tank is 15cm, and is increased by 5cm compared with the plant at the initial stage of the experiment.
The plant and sediment/zeolite repair material has a certain inhibition rate on ammonia nitrogen, the ammonia nitrogen content in the overlying water in the blank experimental fish tank is in a rapid increasing trend in the early stage of the experiment, the ammonia nitrogen content begins to decrease when the experiment is carried out for about one week, but the ammonia nitrogen content in the overlying water is in a slow increasing trend quickly, and the ammonia nitrogen release rate in the overlying water gradually tends to be gentle and is not greatly increased or reduced any more when the experiment is carried out for about 35 days.
The ammonia nitrogen content in the overlying water in the sediment/zeolite restoration material group fish tank is in a rapid increasing trend at the initial stage of the experiment, the ammonia nitrogen content begins to decrease when the experiment is carried out for about 4 days, the ammonia nitrogen content begins to increase slowly when the experiment is carried out for about 7 days, the ammonia nitrogen content in the overlying water is in a slow decreasing trend when the experiment is carried out for about 11 days, the ammonia nitrogen content in the overlying water gradually tends to be gentle when the experiment is carried out for 28 days, and the ammonia nitrogen removal rate in the overlying water is 25.47% when the experiment is carried out for 41 days; the ammonia nitrogen content in the overlying water in the fish tank of the sediment/zeolite repair material + plant group shows a wavy growth trend in the initial stage of the experiment, the ammonia nitrogen content in the overlying water is in a rapid growth state in the early stage, the ammonia nitrogen content in the overlying water shows a descending trend in about 4 days and shows a slow growth trend in a week, the ammonia nitrogen content in the overlying water starts to show a wavy descending trend when the experiment is carried out for about 10 days, the ammonia nitrogen content in the overlying water changes gently in about 33 days, and the ammonia nitrogen removal rate is 39.39% in 41 days.
TABLE 2 Ammonia Nitrogen removal in 4 experimental groups of comparative example
Figure BDA0002820897510000131
The results show that: the plant strain length of the sediment/clay repair material experimental group is increased by 8cm compared with that of the sediment/zeolite repair material, the ammonia nitrogen removal rate of the sediment/clay repair material is 16.5% higher than that of the sediment/zeolite repair material, and the ammonia nitrogen removal rate of the sediment/clay repair material + plant is 15.6% higher than that of the sediment/zeolite repair material + plant. Therefore, the repairing material prepared by using the sediment and the clay not only can obtain higher ammonia nitrogen removal rate, but also can realize better aquatic plant habitat repairing effect, which is probably because the clay can better meet the requirement of plant root growth compared with zeolite.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A preparation method of a nitrogen-controlling and aquatic plant habitat restoration material comprises the following steps:
(1) collecting bottom mud on the surface layer of the water body, freeze-drying and grinding for later use;
(2) carrying out constant-temperature heating treatment on the bottom mud treated in the step (1), and cooling to obtain sediment powder;
(3) and (3) mixing the ground clay with the sediment powder obtained in the step (2), adding water for infiltration, heating at constant temperature after shaping, and cooling to obtain the repair material.
2. The method according to claim 1, wherein the mass ratio of the deposit in the repair material is 30% to 60%, preferably 40% to 50%.
3. The production method according to claim 1, wherein the shape of the repair material is spherical, flaky, cubic, or rectangular parallelepiped.
4. The preparation method according to claim 1, wherein in step (1), the ground substrate sludge is sieved through a 50-150 mesh sieve, preferably, the ground substrate sludge is sieved through a 100 mesh sieve.
5. The method of claim 1, wherein in step (3), the clay is ground and then passed through a 50-150 mesh sieve, preferably, the clay is ground and then passed through a 100 mesh sieve.
6. The production method according to claim 1, wherein the constant temperature heating in the steps (1) and (3) is 550 ℃ and 650 ℃ (for example 580 ℃, 600 ℃ or 620 ℃), and the time of the constant temperature heating treatment is 1.5 to 2.5 hours, for example 2 hours.
7. The method according to claim 1, wherein the amount of water added is 20 to 25% by weight of the mixed raw material of clay and sediment.
8. The method of claim 1, wherein the body of water is a lake or river.
9. A nitrogen-controlling and aquatic plant habitat restoration material prepared by the preparation method of any one of claims 1 to 8.
10. The use of the nitrogen-controlling and aquatic plant habitat restoration material of claim 9 in ammonia nitrogen adsorption and aquatic plant habitat restoration.
CN202011419893.5A 2020-12-07 2020-12-07 Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof Pending CN114700034A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011419893.5A CN114700034A (en) 2020-12-07 2020-12-07 Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011419893.5A CN114700034A (en) 2020-12-07 2020-12-07 Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof

Publications (1)

Publication Number Publication Date
CN114700034A true CN114700034A (en) 2022-07-05

Family

ID=82167785

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011419893.5A Pending CN114700034A (en) 2020-12-07 2020-12-07 Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof

Country Status (1)

Country Link
CN (1) CN114700034A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1769198A (en) * 2005-09-05 2006-05-10 中国科学院生态环境研究中心 Method for transferring water bloom to water-bed plant using clay agglomeration
CN106006814A (en) * 2015-11-12 2016-10-12 中国环境科学研究院 Sediment/zeolite nitrogen control material prepared from lake sediment, method and application thereof
CN106000283A (en) * 2015-11-12 2016-10-12 中国环境科学研究院 Modified nitrogen control material prepared from lake sediments, preparation method and application thereof
CN106000284A (en) * 2015-11-12 2016-10-12 中国环境科学研究院 Nitrogen controlling material prepared based on lake sediment, preparation method and application thereof
CN106277672A (en) * 2016-08-31 2017-01-04 中国环境科学研究院 A kind of sediment water interface Phosphurus release controls preparation method and the application of material
CN106311129A (en) * 2016-08-31 2017-01-11 中国环境科学研究院 Preparation method and application of efficient removing materials for interstitial water phosphate of sediments

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1769198A (en) * 2005-09-05 2006-05-10 中国科学院生态环境研究中心 Method for transferring water bloom to water-bed plant using clay agglomeration
US20090107912A1 (en) * 2005-09-05 2009-04-30 Gang Pan Composite Material and Method for Removing Harmful Algal Blooms and Turning Them into Submerged Macrophytes
CN106006814A (en) * 2015-11-12 2016-10-12 中国环境科学研究院 Sediment/zeolite nitrogen control material prepared from lake sediment, method and application thereof
CN106000283A (en) * 2015-11-12 2016-10-12 中国环境科学研究院 Modified nitrogen control material prepared from lake sediments, preparation method and application thereof
CN106000284A (en) * 2015-11-12 2016-10-12 中国环境科学研究院 Nitrogen controlling material prepared based on lake sediment, preparation method and application thereof
CN106277672A (en) * 2016-08-31 2017-01-04 中国环境科学研究院 A kind of sediment water interface Phosphurus release controls preparation method and the application of material
CN106311129A (en) * 2016-08-31 2017-01-11 中国环境科学研究院 Preparation method and application of efficient removing materials for interstitial water phosphate of sediments

Similar Documents

Publication Publication Date Title
CN105859066B (en) A kind of restorative procedure of water pollution bed mud
CN101343090B (en) Lanthanide series water treatment agent and method of preparing the same
Njau et al. Pumice soil: a potential wetland substrate for treatment of domestic wastewater
JP4963012B2 (en) Japanese stone filter material, Japanese stone fired gravel material, or fish breeding method
CN104478162B (en) A kind of biological filter of applicable network of rivers type ditches at villages sewage disposal
CN110330106B (en) In-situ removing device and method for lake sediment overwintering blue algae
CN114700033A (en) Nitrogen and phosphorus control and aquatic plant habitat restoration material and preparation method and application thereof
CN106477835B (en) A kind of modified barrier of the in-situ chemical of high pollution bed mud and application
Feng et al. Characteristics and applications of hybrid constructed wetlands for low-polluted water: Cased in Bagong River of the Yellow River Watershed, China
Tan et al. Adsorption, Volatilization, and Speciation of Selenium in
CN108975626A (en) A kind of landscape water treatment device with recovery of nitrogen and phosphorus effect
CN111470739A (en) Method for inhibiting endogenous pollution release by coupling compound minerals with benthic algae
CN114700034A (en) Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof
CN112851037B (en) Lawn capable of intercepting and purifying particles in water in multiple stages
JP3864181B1 (en) Soil purification apparatus for phosphorus and nitrogen containing drainage, its purification method, and soil used by filling the soil contact treatment tank of the purification method
Haghseresht A revolution in phosphorous removal
JP5134200B2 (en) Underwater soil improver and method for improving underwater soil thereby
CN115108641B (en) Aquatic plant-based eutrophic river channel restoration method
CN113024047B (en) Water environment comprehensive treatment method and application thereof
Scholz et al. Comparison of Vertical‐Flow Constructed Wetlands for the Treatment of Wastewater Containing Lead and Copper
Ke et al. Advanced phosphorus removal for secondary effluent using a natural treatment system
WO2022196828A1 (en) Oil-treating carrier and oil-treating method
Khairalla et al. Performance analysis of the horizontal sub-surface flow constructed wetland under different hydraulic loading rates for rural domestic wastewater treatment
O'Sullivan et al. Rehabilitating mine tailings water using constructed wetlands
Guo et al. Temporal and Spatial Variations in Soil TOC, TN, and TP, and their Relationships in Bioretention Tanks.

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination