Black and odorous water body and sediment in-situ treatment agent and ecological restoration method

Abstract

The invention discloses a black and odorous water body and bottom mud in-situ treatment agent and an ecological restoration method. The agent comprises a repairing agent A and an ecological conditioner B, the repairing agent A comprises modified hydrotalcite, calcium nitrate, potassium permanganate, sodium citrate and PAM, and the ecological conditioner B comprises bacillus subtilis, nitrifying bacteria, denitrifying bacteria and thiobacillus bainite. The method comprises the following steps: at a first stage, adding a repairing agent A into the black and odorous water body, simultaneously carrying out underwater micropore intermittent aeration, and reacting for 1-3 days; in the second stage, an ecological conditioner B is added into the water body, meanwhile, underwater micropore intermittent aeration is carried out, and continuous reaction is carried out till the water quality reaches the corresponding surface water functional area standard; and a third stage: adding chlorella and fish into the water body, and planting emergent aquatic plants on the shore. By adopting a mode of combining physical, chemical, biological and ecological treatment technologies, the method is safe, efficient, economical, feasible, convenient and easy to construct and short in repair period, and provides a thought for black and odorous water body and bottom mud treatment.

Description

Technical Field

[0001] The invention relates to the technical field of environmental governance, and in particular to an in-situ governance agent for black and odorous water bodies and bottom mud and an ecological restoration method. Background Art

[0002] The causes of black and smelly water are complex, but the main reason is that the increase of pollutants in the water exceeds the self-purification capacity of the water. Excessive COD, ammonia nitrogen, total phosphorus, etc. provide a large amount of nutrients for microorganisms and algae in the water, causing them to multiply in large numbers, resulting in hypoxia in the water. The odor of ammonia and sulfur dioxide produced during the metabolism of anaerobic bacteria in the sediment makes the water and sediment smelly. The ferrous sulfide, manganese sulfide and humus in the metabolic products make the water and sediment black. The pollution degree of black and smelly water varies with the seasons.

[0003] In the process of treating black and smelly water bodies, we cannot simply treat the overlying water only. The bottom sediment, as an endogenous pollution, must also be treated. Otherwise, the water body that has been treated to meet the standards will become black and smelly again due to the release of pollutants in the bottom sediment, which is only treating the symptoms but not the root cause.

[0004] At present, the treatment technology of black and odorous water bodies and bottom mud has been developed and mature. It is mainly divided into in-situ treatment and ex-situ treatment. In-situ treatment technology is widely used in engineering practice because of its rapid effect, economic convenience and small impact on the environment and ecology. The in-situ treatment technology of black and odorous water bodies mainly includes: physical methods, such as aeration and oxygenation, dredging, water diversion and water regulation, etc.; chemical methods, such as oxidation-reduction method, flocculation sedimentation method, adsorption, etc.; biological methods, such as adding microbial agents, sowing fish and plants, etc.

[0005] Physical methods are fast-acting and easy to construct, but they only treat the symptoms and not the root cause or cause serious ecological damage. Chemical methods are fast-acting but may cause secondary pollution. Microbial methods have little impact on the ecological environment, but the cycle is long, the activity of microorganisms is greatly affected by the environment, and the loss of bacterial agents is high. In addition, some existing technologies ignore the pathogenicity of microorganisms when screening microbial agents, thus posing a safety hazard to the environment and human health. For example, in the invention patent application with publication number CN112979116A, the composite bacterial agent for the riverbed mud ammonia nitrogen treatment method includes Pseudomonas aeruginosa, and Pseudomonas aeruginosa is a conditional pathogen; in the invention patent application with publication number CN110240286A, the composite microbial strains used include actinomycetes, and actinomycetes are mostly pathogenic bacteria that can parasitize the human body and cause posterior jaw tumors and lung infections.

[0006] The treatment of black and odorous water bodies and bottom mud is not only about the removal of pollutants, but more importantly, the restoration of the overall ecological environment system from the water body, the microorganisms in the water body, the aquatic plants and animals to the bottom mud, the microorganisms in the bottom mud, and then to the slope protection. Therefore, it is necessary to have a quick effect in the short term, be environmentally friendly and healthy, and be effective in the long term. The effect of the treatment relying on a single method is relatively limited. Summary of the invention

[0007] In view of the above problems existing in the prior art, the present invention provides an in-situ treatment agent for black and odorous water bodies and bottom mud and an ecological restoration method.

[0008] According to a first aspect of an embodiment of the present application, there is provided an agent for in-situ treatment of black and odorous water bodies and sludge, comprising a repair agent A and an ecological conditioner B, wherein the repair agent A comprises, by mass percentage, 30% to 45% modified hydrotalcite, 15% to 25% calcium nitrate, 15% to 25% potassium permanganate, 5% to 10% sodium citrate, and 10% to 15% PAM, and the ecological conditioner B comprises, by mass percentage, 20% to 35% Bacillus subtilis, 20% to 35% nitrifying bacteria, 20% to 35% denitrifying bacteria, and 15% to 25% Thiobacillus bayleyii.

[0009] Furthermore, the modified hydrotalcite is prepared by calcining the hydrotalcite at 400° C. in a muffle furnace for 2 to 4 hours, cooling it to room temperature, and grinding it in a ball mill for 4 to 8 hours. The ground material is passed through a 300-mesh standard molecular sieve, and the material under the sieve is the modified hydrotalcite.

[0010] According to a second aspect of an embodiment of the present application, a method for in-situ treatment and ecological restoration of black and odorous water bodies and sludge is provided. Based on the agent described in the first aspect, the method comprises:

[0011] The first stage: Add repair agent A to the black and smelly water body, and carry out underwater microporous intermittent aeration at the same time, and the reaction time is 1 to 3 days;

[0012] The second stage: adding ecological conditioner B to the water body, and carrying out underwater microporous intermittent aeration at the same time, and continuing the reaction until the water quality reaches the corresponding surface water functional zone standard;

[0013] The third stage: adding chlorella and fish to the water body and planting emergent plants on the shore.

[0014] Furthermore, before the first stage, microporous aeration pipes were laid at intervals of 1 to 2 meters along the banks on both sides of the river, carbon fiber grass was laid at intervals of 1 to 3 meters, and microporous aeration pipes were laid at intervals of 1 to 3 meters on the carbon fiber grass. The black and smelly water bodies and bottom mud were sampled and analyzed to determine the dosage of restoration agent A and ecological conditioner B.

[0015] Furthermore, the microporous aeration pipe includes a power supply, a blower, and a connected main pipe and several branch pipes. Each branch pipe is connected to several hoses, and micro aeration holes are distributed on the hoses. The main pipe and branch pipes are installed under the water surface. The blower is used to aerate the black and smelly water bodies and bottom mud, and the power supply provides electricity to the blower.

[0016] Furthermore, water analysis includes analysis of COD, ammonia nitrogen, total nitrogen, total phosphorus, transparency, Do, and odor; sediment analysis includes organic matter analysis and measurement of polluted sediment thickness.

[0017] Furthermore, the dosage of the repair agent A is 1.5 to 8.5 g / m 3 ; The dosage of ecological conditioner B is 4.3~12.9g / m 3 .

[0018] Furthermore, the air flow rate of the first stage aeration is 1 to 3 m 3 / h, using intermittent aeration, aeration for 2 to 4 hours each time, and stop for 2 to 4 hours; the air flow rate of the second stage of aeration is 2 to 3m 3 / h, use intermittent aeration, aerate for 4 to 8 hours each time, and stop for 3 to 5 hours.

[0019] Furthermore, the water flow velocity of the black and smelly water body is less than 1.2 m / s.

[0020] Furthermore, in the third stage, the added fish include bighead carp and silver carp, and the emergent plants planted on the shore include calamus, iris, and reed.

[0021] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0022] 1) The present invention provides a safe, effective, economically feasible, easy to construct, and environmentally friendly black and odorous water body and bottom mud in-situ treatment agent and ecological restoration method, which ensures the simultaneous treatment of mud and water while taking into account economic efficiency and ease of construction, short restoration cycle, and environmental friendliness. The treatment efficiency of urban black and odorous water bodies and bottom mud is improved by combining physical, chemical, biological, and ecological treatment technologies.

[0023] Physical treatment technology, compared with traditional continuous ordinary aeration, the microporous intermittent aeration method of the present invention allows microorganisms to maximize the use of organic carbon for denitrification instead of being oxidized by oxygen, while reducing disturbances to the water body and sediment environment and saving equipment operating costs.

[0024] Black and smelly water bodies and bottom mud are treated in stages. The first stage adopts chemical treatment technology, the main purpose of which is to remove some pollutants such as COD, ammonia nitrogen, total phosphorus, etc. in water bodies and bottom mud, reduce the toxicity of water bodies and bottom mud, adjust the pH of water bodies, increase the dissolved oxygen in water bodies and bottom mud, preliminarily adjust the microbial community in water bodies and bottom mud, and create suitable and stable growth conditions for microorganisms in the second stage of biological treatment technology. In order to avoid secondary pollution, the present invention selects non-toxic, harmless, easily degradable and environmentally friendly materials, and strictly controls the dosage, and does not add excessively, so as to ensure that pollutants are removed without adding new pollution to water bodies and bottom mud.

[0025] Chemical treatment technology, the modified hydrotalcite in the repair agent A is a clay mineral material, which can effectively remove phosphorus from water bodies and sediments. The calcium nitrate in the repair agent A can effectively promote the autotrophic denitrification process of sulfur in the autotrophic denitrifying bacteria in the sediment, generate sulfate ions and nitrogen, and remove black and smelly sulfides and nitrogen in the sediment. Studies have shown that calcium nitrate can effectively remove acid-volatile sulfur in the sediment. The sodium citrate in the repair agent A is a weak acid and strong base salt with good pH adjustment and buffering properties. In the early stage of treatment, it provides a suitable and stable acid-base environment for microorganisms. At the same time, it has a certain complexing ability for metal ions such as iron and manganese. It can be biodegraded under natural conditions and has very little impact on the water environment. Potassium permanganate in the repair agent A is a strong oxidant, which can effectively remove a variety of organic pollutants, algae, toxic substances, etc. in water bodies and sediments, and remove the odor of water bodies and sediments. PAM in the repair agent A is an organic flocculant that can flocculate and precipitate macromolecular organic matter, SS, etc. in the water body to improve the transparency of the water body.

[0026] Based on the first phase, the second phase adopts biological treatment technology, the main purpose of which is to use microorganisms to degrade pollutants in water bodies and bottom mud. The added aerobic and facultative anaerobic compound bacteria, in conjunction with microporous aeration and carbon fiber grass, build a microbial ecology, continuously and stably degrade pollutants in water bodies and bottom mud, solve the problem of black and smelly water bodies and bottom mud, and purify water quality.

[0027] Biological treatment technology, Bacillus subtilis in ecological conditioner B is an aerobic bacteria, commonly used to degrade organic pollutants in water bodies and sediments, while reducing the thickness of polluted sediments, and compounding with nitrifying bacteria and denitrifying bacteria in a certain proportion to synergistically remove ammonia nitrogen, total nitrogen, organic phosphorus, etc. in water bodies and sediments to purify water quality. Bailey's sulfur bacteria in ecological conditioner B is a facultative anaerobic bacteria that can oxidize H2S into sulfur and remove odor from water bodies.

[0028] The microbial agent screened by the present invention has a purifying effect on environmental water bodies, does not cause pathogenicity, and is highly safe. Carbon fiber grass provides a place for microorganisms to attach, forms a flowing biofilm, reduces the loss of microorganisms, increases the hydraulic retention time of pollutants, and strengthens the degradation of pollutants in water bodies and sediments.

[0029] The third phase uses ecological management technology, the main purpose of which is to improve and consolidate the water ecological environment. Sampling and analyzing water and sediment is to ensure that the water environment reaches a healthy level before entering the third phase.

[0030] Ecological governance technology, chlorella is cultivated in the water body, fish are added, including bighead carp and silver carp, and emergent plants including calamus, iris, and reed are planted on the shore. Studies have shown that chlorella can effectively remove pollutants such as COD, nitrogen, phosphorus and heavy metals in the water body, inhibit the growth and reproduction of cyanobacteria and other algae that cause water blooms in the water body, and form a water environment purification system with microorganisms and algae symbiosis. Bighead carp, silver carp, etc. are used as biological manipulation tools, mainly feeding on filter-feeding plankton, which can well control algae, especially large cyanobacteria, thereby inhibiting the occurrence of water blooms. Calamus, iris, and reed help improve the ecological environment of water bodies and bottom mud.

[0031] 2) The various materials provided by the present invention are cheap and readily available, and are easy to operate and construct.

[0032] 3) The present invention does not require secondary or multiple spreading, which saves costs and is convenient and quick.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. DETAILED DESCRIPTION

[0034] The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0035] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0036] The present application provides an agent for in-situ treatment of black and odorous water bodies and bottom mud, comprising a repair agent A and an ecological conditioner B, wherein the repair agent A comprises 30% to 45% of modified hydrotalcite, 15% to 25% of calcium nitrate, 15% to 25% of potassium permanganate, 5% to 10% of sodium citrate, and 10% to 15% of PAM (polyacrylamide) in terms of mass percentage, and the ecological conditioner B comprises 20% to 35% of Bacillus subtilis, 20% to 35% of nitrifying bacteria, 20% to 35% of denitrifying bacteria, and 15% to 25% of Thiobacillus bayleyii in terms of mass percentage.

[0037] The modified hydrotalcite is used to make the hydrotalcite have stronger phosphorus removal ability and stability. The modified hydrotalcite is calcined at 400°C in a muffle furnace for 2 to 4 hours, cooled at room temperature, and ground in a ball mill for 4 to 8 hours. The ground material is passed through a 300-mesh standard molecular sieve, and the material under the sieve is the modified hydrotalcite.

[0038] The modified hydrotalcite in the repair agent A is a clay mineral material that can effectively remove phosphorus from water bodies and sediments. The calcium nitrate in the repair agent A can effectively promote the sulfur autotrophic denitrification process of autotrophic denitrifying bacteria in the sediment, generate sulfate ions and nitrogen, and remove black and smelly sulfides and nitrogen in the sediment. Studies have shown that calcium nitrate can effectively remove acid-volatile sulfur in the sediment. The sodium citrate in the repair agent A is a weak acid and strong base salt with good pH adjustment and buffering properties. In the early stage of treatment, it provides a suitable and stable acid-base environment for microorganisms. At the same time, it has a certain complexing ability for metal ions such as iron and manganese. It can be biodegraded under natural conditions and has very little impact on the water environment. Potassium permanganate in the repair agent A is a strong oxidant that can effectively remove a variety of organic pollutants, algae, toxic substances, etc. in water bodies and sediments, and remove the odor of water bodies and sediments. PAM in the repair agent A is an organic flocculant that can flocculate and precipitate macromolecular organic matter, SS, etc. in the water body to improve the transparency of the water body.

[0039] Bacillus subtilis in Ecological Conditioner B is an aerobic bacteria, commonly used to degrade organic pollutants in water bodies and sediments, while reducing the thickness of polluted sediments. It is compounded with nitrifying bacteria and denitrifying bacteria in a certain proportion to synergistically remove ammonia nitrogen, total nitrogen, organic phosphorus, etc. in water bodies and sediments to purify water quality. Thiobacillus thiobacillus in Ecological Conditioner B is a facultative anaerobic bacteria that can oxidize H2S into sulfur and remove odor from water bodies. The above-mentioned microbial agents have a purifying effect on environmental water bodies, are non-pathogenic, and are highly safe.

[0040] It should be noted that ecological conditioner B should be prepared and used immediately, and the preparation and addition process should be avoided from direct sunlight to avoid affecting the activity of the bacterial agent.

[0041] The present application also provides a method for in-situ treatment and ecological restoration of black and odorous water bodies and bottom mud, which is based on the above-mentioned agent and comprises:

[0042] The first stage: Add repair agent A to the black and smelly water body, and carry out underwater microporous intermittent aeration at the same time, and the reaction time is 1 to 3 days;

[0043] The second stage: adding ecological conditioner B to the water body, and carrying out underwater microporous intermittent aeration at the same time, and continuing the reaction until the water quality reaches the corresponding surface water functional zone standard;

[0044] The third stage: adding chlorella and fish to the water body and planting emergent plants on the shore.

[0045] In a possible implementation, before the first stage, microporous aeration pipes are laid at intervals of 1 to 2 meters along the banks on both sides of the river, and carbon fiber grass is laid at intervals of 1 to 3 meters. Carbon fiber grass provides a place for microorganisms to attach, forming a flowing biofilm, reducing the loss of microorganisms. The grass floats with the water underwater, capturing pollutants in the water, increasing the hydraulic retention time of pollutants, and strengthening the degradation of pollutants in the water and sediment. Sampling and analysis of black and odorous water bodies and sediments are carried out, wherein water body analysis includes analysis of COD (Chemical Oxygen Demand), ammonia nitrogen, total nitrogen, total phosphorus, transparency, Do (dissolved oxygen), and odor; sediment analysis includes organic matter analysis and measurement of polluted sediment thickness, so as to determine the dosage of repair agent A and ecological conditioner B.

[0046] In a possible implementation, the microporous aeration pipe includes a power supply, a blower, and a connected main pipe and several branch pipes. Each branch pipe is connected to several hoses, and micro aeration holes are distributed on the hoses. The main pipe and branch pipes are installed under the water surface. The blower is used to aerate the black and smelly water and bottom mud. The power supply provides power for the blower. Aeration can provide the necessary oxygen for microbial metabolism. The microporous aeration device makes aeration uniform and causes little disturbance to the water and bottom mud.

[0047] In a possible implementation, the dosage of the repair agent A is 1.5 to 8.5 g / m 3 ; The dosage of ecological conditioner B is 4.3~12.9g / m 3 The dosage is determined based on the analysis results in the preparation stage.

[0048] In one possible implementation, the air flow rate of the first stage of aeration is 1 to 3 m 3 / h, using intermittent aeration, aeration for 2 to 4 hours each time, and stop for 2 to 4 hours; the air flow rate of the second stage of aeration is 2 to 3m 3 / h, using intermittent aeration, aeration for 4-8 hours each time, and stop for 3-5 hours. The microporous intermittent aeration method enables microorganisms to maximize the use of organic carbon for denitrification instead of being oxidized by oxygen, while reducing disturbance to the water body and bottom mud environment, saving equipment operating costs.

[0049] In a possible implementation, in the third stage, the added fish may include bighead carp and silver carp, and the emergent plants planted on the shore may include calamus, iris, and reed. The Chlorella cultivated in the water body, the added fish include bighead carp and silver carp, and the emergent plants planted on the shore include calamus, iris, and reed. Studies have shown that Chlorella can effectively remove pollutants such as COD, nitrogen, phosphorus, and heavy metals in the water body, inhibit the growth and reproduction of cyanobacteria and other algae that cause water blooms in the water body, and form a water environment purification system with symbiotic bacteria and algae with microorganisms. Bighead carp, silver carp, etc. are used as biological manipulation tools, mainly feeding on filter-feeding plankton, which can well control algae, especially large-sized cyanobacteria, thereby inhibiting the occurrence of water blooms. Calamus, iris, and reed help improve the ecological environment of water bodies and bottom mud.

[0050] It should be noted that the water flow velocity of the black and smelly water body targeted by this application usually needs to be less than 1.2 m / s to avoid the flow velocity being too fast to fully remove the pollution.

[0051] Example 1

[0052] This embodiment provides a black and odorous water body and bottom mud in-situ treatment agent and ecological restoration method. For a river with a water flow velocity of 0.9 m / s, the following steps are followed:

[0053] Preparation stage: During the treatment period, it is forbidden to discharge sewage into the water from sewage pipes in the water area. Grilles are set up upstream and downstream of the treated river to intercept floating garbage, fallen leaves, algae, etc., and garbage, fallen leaves, algae, dead fish, etc. on the water surface are salvaged regularly. Microporous aeration pipes are laid at intervals of 1m along the banks on both sides of the river in the treated water area, and carbon fiber grass is laid at intervals of 1.5m between microporous aeration pipes, and microporous aeration pipes are laid at intervals of 1m between carbon fiber grass, and so on, arranged back and forth, and laid flexibly according to the cross-section of the river. Sampling and analysis of polluted water bodies and sediments are carried out.

[0054] The first stage: add 5.5g / m into the black and smelly water 3 Repair agent A, while performing underwater microporous intermittent aeration, the air flow rate is 1.5m 3 / h, each aeration is 2h, and then stopped for 2h. The reaction time of the first stage is 2 days.

[0055] Repair agent A includes 35% modified hydrotalcite, 25% calcium nitrate, 15% potassium permanganate, 10% sodium citrate and 15% PAM in percentage by mass. The mixture is stirred evenly. The modified hydrotalcite is prepared by the following process: the hydrotalcite is calcined at 400° C. in a muffle furnace for 3 hours, cooled at room temperature, and ground in a ball mill for 8 hours. The ground material is passed through a 300-mesh standard molecular sieve, and the material under the sieve is taken to obtain the modified hydrotalcite, which is sealed and stored for standby use.

[0056] The second stage: add ecological conditioner B to the water body, and carry out underwater microporous intermittent aeration at the same time, with an air flow rate of 2m 3 / h, aeration for 4h each time, stop for 3h, the second stage reaction time is 7 days, so that the water quality reaches the corresponding surface water functional area standard and the degree of sediment pollution is reduced.

[0057] Ecological conditioner B includes the following mass percentages: 25% Bacillus subtilis, 25% nitrifying bacteria, 35% denitrifying bacteria, and 15% Thiobacillus thiophaga. Mix and stir evenly. Ecological conditioner B is added by manual spraying, evenly spraying the agent into the water body, using a small boat, and the dosage is 6.50g / m 3 .

[0058] The third stage: Add chlorella and fish to the water body and plant emergent plants on the shore to increase the biodiversity of the water environment and further stabilize the ecological environment.

[0059] Example 2

[0060] This embodiment provides a black and odorous water body and bottom mud in-situ treatment agent and ecological restoration method, for a pond with a water flow rate of 0.5m / s, the method is carried out according to the following steps:

[0061] Preparation stage: During the treatment period, it is forbidden to discharge sewage into the water from sewage pipes in the water area. Grilles are set up upstream and downstream of the treated river to intercept floating garbage, fallen leaves, algae, etc., and garbage, fallen leaves, algae, dead fish, etc. on the water surface are salvaged regularly by humans; microporous aeration pipes are laid at intervals of 2m along the shore of the pond, carbon fiber grass is laid at intervals of 3m between microporous aeration pipes, and microporous aeration pipes are laid at intervals of 3m between carbon fiber grass, and so on, arranged back and forth, and laid flexibly according to specific conditions. Sampling and analysis of polluted water bodies and bottom mud are carried out.

[0062] The first stage: add 8.5g / m into the black and smelly water 3 Repair agent A, while performing underwater microporous aeration, the air flow rate is 3m 3 / h, using intermittent aeration, aeration for 4 hours each time, and rest for 4 hours. The first stage reaction time is 3 days.

[0063] Repair agent A includes 40% modified hydrotalcite, 20% calcium nitrate, 25% potassium permanganate, 5% sodium citrate, and 10% PAM in percentage by mass, and the mixture is stirred evenly. The hydrotalcite modification process is as follows: the hydrotalcite is calcined at 400°C in a muffle furnace for 3 hours, cooled at room temperature, and ground in a ball mill for 8 hours. The ground material is passed through a 300-mesh standard molecular sieve, and the material under the sieve is taken to obtain the modified hydrotalcite, which is sealed and stored for standby use.

[0064] The second stage: add ecological conditioner B to the water body and carry out underwater microporous aeration at the same time, with an air flow rate of 2.5m 3 / h, using intermittent aeration, each aeration 8h, stop 4h. The second stage reaction time is 19 days, so that the water quality reaches the corresponding surface water functional area standard, and the sediment pollution degree is reduced.

[0065] Ecological conditioner B includes the following in percentage by mass: 35% Bacillus subtilis, 20% nitrifying bacteria, 25% denitrifying bacteria, and 20% Thiobacillus baylis. The mixture is mixed and stirred evenly.

[0066] Ecological conditioner B should be prepared and used immediately. Avoid direct sunlight during preparation and addition to prevent the activity of the agent. Ecological conditioner B is added by manual spraying, evenly spraying the agent into the water body. The tool is a small boat, and the dosage is 10.8g / m 3 .

[0067] The third stage: adding Chlorella and fish (including bighead carp and silver carp) into the water body, and planting emergent plants (including calamus, iris, and reed) on the shore to increase the biodiversity of the water environment and further stabilize the ecological environment.

[0068] Application Examples

[0069] A pond near a residential area, closed water area, water area 800m 2 The average water depth is 2.5m, and the average water flow rate in the pond is 0.2m / s. Due to the lack of management throughout the year, a large number of fallen leaves, plastic garbage, dead fish, etc. often float on the water surface. Rainwater around the pond flows into the pond through surface runoff, and the water is yellow and green, with low transparency, and emits a peculiar smell, especially in summer. It affects the lives of surrounding residents.

[0070] The ecological restoration method of the present invention uses an in-situ treatment agent for black and odorous water body sludge, including a repair agent A and an ecological conditioning agent B, and the following steps are followed:

[0071] Preparation stage: Regularly salvage floating garbage, fallen leaves, algae, dead fish, etc. on the pond surface, and lay microporous aeration pipes at intervals of 2m along the shore in the treated waters, lay carbon fiber grass at intervals of 3m between microporous aeration pipes, and lay microporous aeration pipes at intervals of 3m between carbon fiber grass, and so on, in a reciprocating arrangement, flexibly laid according to the cross-section of the river. Sampling and analysis of polluted water bodies and bottom mud.

[0072] The first stage: add 3.5g / m into the black and smelly water 3 Repair agent A, while performing underwater microporous aeration, the air flow rate is 2m 3 / h, using intermittent aeration, each time aeration 3h, stop 3h. The first stage reaction time is 2 days. Repair agent A includes according to mass percentage: 35% modified hydrotalcite, 25% calcium nitrate, 20% potassium permanganate, 10% sodium citrate, 10% PAM, mix and stir evenly. The hydrotalcite modification process is: calcine the hydrotalcite in a muffle furnace at 400°C for 4 hours, cool to room temperature, and grind in a ball mill for 6 hours. The ground material is passed through a 300-mesh standard molecular sieve, and the sieve is taken to obtain the modified hydrotalcite, which is sealed and stored for later use.

[0073] The second stage: add ecological conditioner B to the water body and carry out underwater microporous aeration at the same time, with an air flow rate of 2.5m 3 / h, using intermittent aeration, each aeration is 8h, and then stop for 4h. The second stage reaction time is 25 days, so that the water quality reaches the corresponding surface water functional area standard and the degree of sediment pollution is reduced. Ecological conditioner B includes according to the mass percentage: 30% Bacillus subtilis, 25% nitrifying bacteria, 25% denitrifying bacteria, 20% Bayer thiobacillus, mix and stir evenly. Ecological conditioner B is prepared and used immediately. Avoid direct sunlight during the preparation and addition process to affect the activity of the bacterial agent. Ecological conditioner B is added by manual sprinkling, and the agent is evenly sprinkled into the water body. The tool is a small boat, and the dosage is 7.00g / m 3 .

[0074] After 25 days, the transparency and quality of the pond water had changed significantly, and there was basically no odor.

[0075] The third stage: Add chlorella and fish to the water body and plant emergent plants on the shore to increase the biodiversity of the water environment and further stabilize the ecological environment.

[0076] The surface water and sediment of the pond were tested at each stage, and the results are shown in Table 1.

[0077] Table 1. Test results of pond surface water and sediment

[0078]

[0079]

[0080] The third phase of sampling and analysis shows that the surface water quality of the pond meets the IV water quality standard of the Environmental Quality Standard for Surface Water (GB3838-2002). The organic matter content in the sediment decreased by 42.6%, and the thickness of the polluted sediment was reduced by 3 cm. A black and odorous water body and sediment in-situ treatment agent including repair agent A and ecological conditioner B can significantly improve the pond water quality. A black and odorous water body and sediment ecological restoration method can effectively solve the black and odorous water problem and restore the self-purification ability of the water body.

[0081] It is foreseeable that in the third phase, the water quality will be further improved by sowing chlorella seeds into the water body, adding fish, including bighead carp and silver carp, and planting emergent plants, including calamus, iris, and reeds, on the shore to further improve the ecological environment of the pond. At the same time, management will be strengthened.

[0082] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

Claims

1. A black and odorous water body and bottom mud in-situ treatment agent, characterized in that: The invention comprises a repair agent A and an ecological conditioner B. The repair agent A comprises 30% to 45% of modified hydrotalcite, 15% to 25% of calcium nitrate, 15% to 25% of potassium permanganate, 5% to 10% of sodium citrate and 10% to 15% of PAM in terms of mass percentage. The ecological conditioner B comprises 20% to 35% of Bacillus subtilis, 20% to 35% of nitrifying bacteria, 20% to 35% of denitrifying bacteria and 15% to 25% of Thiobacillus bayleyii in terms of mass percentage.

2. The in-situ treatment agent for black and odorous water and bottom mud according to claim 1, characterized in that: The modified hydrotalcite is prepared by calcining the hydrotalcite at 400° C. in a muffle furnace for 2 to 4 hours, cooling it at room temperature, and grinding it in a ball mill for 4 to 8 hours. The ground material is passed through a 300-mesh standard molecular sieve, and the material under the sieve is the modified hydrotalcite.

3. A method for in-situ treatment and ecological restoration of black and odorous water bodies and bottom mud, characterized in that: Based on the medicament of claim 1, the method comprises: The first stage: Add repair agent A to the black and smelly water body, and carry out underwater microporous intermittent aeration at the same time, and the reaction time is 1 to 3 days; The second stage: adding ecological conditioner B to the water body, and carrying out underwater microporous intermittent aeration at the same time, and continuing the reaction until the water quality reaches the corresponding surface water functional zone standard; The third stage: adding chlorella and fish to the water body and planting emergent plants on the shore.

4. A method for in-situ treatment and ecological restoration of black and odorous water bodies and bottom mud according to claim 3, characterized in that: Before the first stage, microporous aeration pipes were laid at intervals of 1 to 2 meters along the banks on both sides of the river, carbon fiber grass was laid at intervals of 1 to 3 meters, and microporous aeration pipes were laid at intervals of 1 to 3 meters between carbon fiber grasses. The black and smelly water bodies and bottom mud were sampled and analyzed to determine the dosage of restoration agent A and ecological conditioner B.

5. A method for in-situ treatment and ecological restoration of black and odorous water bodies and bottom mud according to claim 4, characterized in that: The microporous aeration pipe includes a power supply, a blower, and a connected main pipe and several branch pipes. Each branch pipe is connected to several hoses, and micro aeration holes are distributed on the hoses. The main pipe and branch pipes are installed under the water surface. The blower is used to aerate the black and smelly water and bottom mud, and the power supply provides electricity for the blower.

6. The method for in-situ treatment and ecological restoration of black and odorous water and sediment according to claim 3, characterized in that: Water analysis includes analysis of COD, ammonia nitrogen, total nitrogen, total phosphorus, transparency, Do, and odor; sediment analysis includes organic matter analysis and measurement of polluted sediment thickness.

7. The method for in-situ treatment and ecological restoration of black and odorous water bodies and bottom mud according to claim 3 is characterized in that: The dosage of repair agent A is 1.5~8.5g / m 3 ; The dosage of ecological conditioner B is 4.3~12.9g / m 3 .

8. The method for in-situ treatment and ecological restoration of black and odorous water and sediment according to claim 3 is characterized in that: The air flow rate of the first stage aeration is 1~3m 3 / h, using intermittent aeration, aeration for 2 to 4 hours each time, and stop for 2 to 4 hours; the air flow rate of the second stage of aeration is 2 to 3m 3 / h, use intermittent aeration, aerate for 4 to 8 hours each time, and stop for 3 to 5 hours.

9. The method for in-situ treatment and ecological restoration of black and odorous water and sediment according to claim 3, characterized in that: The water flow velocity of the black and smelly water body is less than 1.2 m / s.

10. The method for in-situ treatment and ecological restoration of black and odorous water bodies and bottom mud according to claim 3, characterized in that: In the third phase, the added fish include bighead carp and silver carp, and the emergent plants planted on the shore include calamus, iris and reed.

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