CN113248093A - Ecological composite bottom mud in-situ restoration agent and restoration process - Google Patents
Ecological composite bottom mud in-situ restoration agent and restoration process Download PDFInfo
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- CN113248093A CN113248093A CN202110558293.5A CN202110558293A CN113248093A CN 113248093 A CN113248093 A CN 113248093A CN 202110558293 A CN202110558293 A CN 202110558293A CN 113248093 A CN113248093 A CN 113248093A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention discloses an ecological composite bottom mud in-situ restoration agent and a restoration process, which consists of a bottom-improving agent and a composite ecological restoration agent; the bottom-improving agent is composed of potassium hydrogen peroxide phosphate composite salt, calcium peroxide or the combination of the two in any proportion; the composite ecological restoration agent consists of 10-30% of growth promoting carrier, 5-15% of phosphorus locking agent, 1-5% of buffering agent and 50-84% of microbial agent by mass. The invention can effectively and continuously restore polluted water.
Description
Technical Field
The invention relates to the field of water environment restoration materials. More specifically, the invention relates to an ecological composite bottom mud in-situ remediation agent and a remediation process.
Background
The black and odorous water body repairing technology mainly comprises an exogenous pollution interception technology and a surface water source control technology. Wherein, the endogenous management mainly comprises an in-situ repair technology and a translocation repair technology. Although the translocation restoration technology is relatively mature, the cost is high, secondary pollution is easy, and the promotion and application of the translocation restoration technology are difficult due to the serious damage to the bottom of a river channel and the ecological system of a water body. Compared with the translocation treatment technology, the in-situ remediation technology can treat the polluted bottom mud on site, avoids the problems of secondary pollution caused by the re-precipitation of the sediment in the dredging process and the transmission process, and has good application prospect due to small engineering quantity.
The in-situ pollution remediation of the bottom sediment is to control the release of pollutants in the bottom sediment or accelerate the degradation and conversion of the pollutants by certain technical measures on the premise of not transferring the bottom sediment, and mainly comprises four methods, namely bottom sediment oxygenation, microbial agent addition, bottom sediment coverage, bottom sediment passivation and the like according to the technical measures and action mechanisms thereof. The oxygen increasing of the bottom sludge and the adding of the microbial agent to the bottom sludge can accelerate the degradation and conversion of organic pollutants in the sludge in a short period. However, when the dosage of the medicament is usually higher, the nitrate content of the bottom mud is easily and rapidly increased, or a strong oxidation environment is caused, and great harm is caused to bottom mud animals and water animals and plants. In addition, the bottom-changing components in the bottom sediment repairing agent are easy to disturb the bottom sediment and quickly decompose organic matters, so that the activation and release of inorganic pollutants such as phosphorus, heavy metals and the like in the bottom sediment are easy to cause. On the other hand, the repairing agents adopted in the prior art generally have the problems of higher production and preparation cost, single repairing way, unstable repairing effect and the like, and some repairing agents are also likely to cause secondary pollution or cause ecological risks, such as microbial growth promoters and polymeric flocculants. Part of in-situ remediation agents adopt microbial agents, however, due to the characteristics of the fluidity of river water, discontinuous feeding and the like, and the relations of competition, antagonism and the like between indigenous microorganisms and exogenous microorganisms in an aqueous ecosystem, a single bacterium feeding process is difficult to maintain the purification effect for a long time.
The existing bottom mud modification and restoration method is single chemical modification and physical adsorption, the reaction is rapid but the sustainability is poor, the synergistic effect with a microbial agent or with submerged plants is weak, the water quality is easy to rebound after restoration, the ecological diversity and stability of the restored water bottom mud are poor, and the restoration is easy to repeat after treatment.
Disclosure of Invention
The invention aims to provide an ecological composite bottom mud in-situ remediation agent and a remediation process, which can effectively and continuously remediate polluted water.
To achieve these objects and other advantages in accordance with the present invention, there is provided an ecological type composite bottom mud in-situ remediation agent, characterized by consisting of a bottom-improving agent and a composite ecological remediation agent;
the bottom-improving agent is composed of potassium hydrogen peroxide phosphate composite salt, calcium peroxide or the combination of the two in any proportion;
the composite ecological restoration agent consists of 10-30% of growth promoting carrier, 5-15% of phosphorus locking agent, 1-5% of buffering agent and 50-84% of microbial agent by mass;
preferably, the number of viable bacteria in the microbial agent is 1-9 multiplied by 109cfu/g。
Preferably, the growth-promoting carrier is medical stone, steel slag or a mixture of the medical stone and the steel slag. Preferably, the medical stone and the steel slag are powder which are sieved by a 40-mesh sieve;
when the growth-promoting carrier is a mixture of the growth-promoting carrier and the growth-promoting carrier, the preparation method of the growth-promoting carrier comprises the following steps: according to parts by weight, taking 5-10 parts of medical stone powder and 2-5 parts of steel slag powder, grinding, sieving with a 40-mesh sieve, and taking undersize products.
The medical stone is natural medical stone, such as medical stone produced by Shandong Mongolian Yin, inner Mongolian Neman flag, Tianjin Ji county and Liaoning Fuxin, has adsorbability, dissolvability, adjustability, bioactivity and the like, and can dissolve out trace elements for promoting the growth of microorganisms and plants; the steel slag is prepared from electric furnace steel slag through calcination, crushing and screening, and has the functions of providing a slightly alkaline environment for a microbial agent and promoting the absorption and stability of phosphorus in a water body. The medical stone and the steel slag are used as growth promoting carriers, so that the growth of bottom sludge microbial flora can be effectively promoted to create a proper microenvironment, and the stability and the impact resistance of the bottom sludge microbial flora are improved.
Preferably, the phosphorus locking agent is lanthanum modified bentonite, and the lanthanum modified bentonite comprises rare earth lanthanum and bentonite, and has the function of removing phosphorus in the polluted water body, and precipitating and enclosing the phosphorus in the bottom mud.
Preferably, the buffering agent is calcium bentonite, and has the function of slowly releasing calcium ions in the bottom mud to improve the acid-base buffering performance of the bottom mud.
Preferably, the microbial agent comprises the following components in parts by weight: 5-10 parts of saccharomycetes, 25-40 parts of nitrobacteria, 15-20 parts of thiobacillus denitrificans, 30-40 parts of bacillus and 5-10 parts of photosynthetic bacteria;
the ratio of the growth promoting carrier to the microbial agent is 1-3: 1.
the invention also provides a process for restoring water by using the ecological composite bottom mud in-situ restoration agent, wherein the bottom-changing agent is added according to the oxidation-reduction potential of the bottom mud, after the bottom-changing agent is added for 3-15 days, the dissolved oxygen in the water is stabilized to be more than 3mg/L, meanwhile, the oxidation-reduction potential of the bottom mud is increased to be more than-100 mV, and the composite ecological restoration agent is added when the water covering the bottom mud is in a weakly alkaline condition.
Preferably, according to the pollution condition of the bottom mud of the rivers and the lakes, the mixing amount of the bottom modifying agent is 50-250g per square meter of water surface, and the bottom modifying agent is used for modifying and pretreating the bottom mud of the rivers and the lakes to create conditions for ecological restoration;
the mixing amount of the composite ecological restoration agent is 1-15 kg per square meter of water surface.
Preferably, the method specifically comprises the following steps:
firstly, sewage interception treatment is carried out on an area to be repaired, the polluted area is separated, so that a water body for treatment is relatively closed, and the water level is reduced to be below 1.5m under the condition of a condition;
step two, in the first repairing stage, adding a bottom modifying agent according to the oxidation-reduction potential condition of the bottom sediment, adjusting the oxidation-reduction potential of the bottom sediment to be more than-100 mV by adopting a plurality of times of small adding modes, stabilizing the dissolved oxygen in water to be more than 3mg/L, maintaining the alkalescent condition of the water covered on the bottom sediment, and maintaining the repairing duration to be 3-15 days;
step three, adding a composite ecological restoration agent in the second restoration stage, wherein the composite ecological restoration agent is uniformly spread, the adding amount of the slightly polluted bottom mud is 1-5kg per square meter of water surface, the adding amount of the moderately and severely polluted bottom mud or the area where the sewage interception is not thorough is 4-10kg per square meter of water surface, and the adding amount of the heavily polluted bottom mud area of the river or the lake is 9-15kg per square meter of water surface; generally, adding a bottom mud repairing agent on the water surface of the river in a sunny day in a time period with relatively slow water flow;
and step four, adding a microbial inoculum into the bottom mud and the water body of the river channel, and normally maintaining the time for one year after purification, wherein if a large amount of seriously polluted water body is discharged into the river channel at the upstream in the period, a compound ecological restoration agent needs to be added into the river channel, and the supplement dosage is 10-30% of the first addition.
Preferably, if the water body is matched with submerged plant planting, the submerged plant is planted after the composite ecological restoration agent is added for 5-7 days.
The invention at least comprises the following beneficial effects: the invention is prepared by using cheap and easily obtained steel smelting waste by-product steel slag, natural mineral medical stone, calcium bentonite and a commercially available microbial inoculum product which meets the national standard and contains saccharomycetes, nitrobacteria, thiobacillus denitrificans, bacillus and photosynthetic bacteria as main raw materials through the working procedures of grinding, mixing and the like. The raw materials are wide in source, cheap and available, the preparation process is simple, and the preparation conditions are mild; the production is easy to scale, and the production and application can not generate the problem of secondary pollution. The in-situ remediation agent for the bottom sediment can efficiently inhibit the release of pollutants in the bottom sediment, and has a good inhibition effect on nitrogen and phosphorus substances which are easy to cause water bloom.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
Example 1
An ecological composite bottom mud in-situ remediation agent comprises the following components in parts by mass: the component 1 is commercial industrial grade potassium hydrogen peroxide phosphate composite salt; the component 2 composite ecological restoration agent consists of 24 percent of growth promoting carrier, 12 percent of commercially available phosphorus locking agent lanthanum modified bentonite, 4 percent of buffering agent calcium bentonite and 60 percent of microbial agent. Wherein the growth promoting carrier is prepared from medical stone and steel slag according to the mass ratio of 5:2, mixing the components.
The microbial agent comprises yeast with effective viable count of 3.4 × 10 or more9cfu/g; nitrifying bacteria with effective viable count not less than 1.8 × 1010cfu/g; thiobacillus denitrificans with effective viable count of more than or equal to 2.7 multiplied by 109cfu/g; bacillus with effective viable count not less than 2.3 × 109cfu/g; photosynthetic bacteria with effective viable count not less than 8.4 × 109cfu/g; according to the weight ratio, the yeast: nitrifying bacteria: thiobacillus denitrificans: bacillus: photosynthetic bacteria ═ 6:35:20:34: 5.
The preparation in the embodiment is prepared by weighing medical stone and steel slag raw materials according to a formula, grinding the raw materials in a pulverizer, sieving the ground materials by a 40-mesh sieve, fully and physically mixing the undersize materials with lanthanum modified bentonite, calcium bentonite and a microbial inoculum according to the formula proportion, and uniformly stirring the mixture to obtain the component 2 composite ecological restoration agent.
When the preparation in the embodiment is used for carrying out in-situ remediation on certain lake sediment, the remediation method comprises the following steps:
s1: carrying out pollutant interception treatment on the area to be repaired, and separating the polluted area; after the sewage interception is finished, the water level of the treatment area is reduced to below 1 m;
s2: uniformly spreading the component 1, namely the base-modifying agent potassium hydrogen peroxyphosphate composite salt on the surface of the sludge layer, wherein the spreading amount is 65 g/m2；
S3: after 7 days, after the oxidation-reduction potential (ORP) of the water layer covering the sludge is increased to-60 mV and the dissolved oxygen in the water is stabilized to be more than 3mg/L, the component 2 composite ecological restoration agent is scattered, and the spreading amount is 120 g/m2；
S4: after 5 days, the number of the plants is 48 per m2Planting dwarf tape grass at a density of 40 clusters/m2The malayan eupatorium herb is planted at the density, the malayan eupatorium herb and the malayan eupatorium herb are planted in a close manner in a large scale, then the water level is lifted, the enclosure is removed, plant maintenance is carried out, and the ecological restoration of the black and odorous water body is completed.
Analysis of results
The treatment of the above measures is adopted, and the lake treatment after 90 days and 365 days (no large amount of seriously polluted water is discharged upstream) is respectively detected, and the front and back changes of the lake water quality are shown in table 1.
TABLE 1 Water quality before and after remediation
As can be seen from the table, after the black and odorous water body is repaired by adopting the bottom mud in-situ repair medicament and the method, various indexes of water quality are obviously improved and basically reach the IV-class water body standard, and the method has a good effect on repairing the black and odorous water body.
Example 2
An ecological composite bottom mud in-situ remediation agent comprises the following components in parts by mass: the component 1 is commercial industrial grade potassium hydrogen peroxide phosphate composite salt; the component 2 composite ecological restoration agent consists of 20 percent of growth promoting carrier, 12 percent of commercially available phosphorus locking agent lanthanum modified bentonite, 4 percent of buffering agent calcium bentonite and 64 percent of microbial agent. Wherein the growth promoting carrier is prepared from medical stone and steel slag according to the mass ratio of 5:2, mixing the components.
The microbial agent comprises yeast with effective viable count of 3.4 × 10 or more9cfu/g; nitrifying bacteria with effective viable count not less than 1.8 × 1010cfu/g; thiobacillus denitrificans with effective viable count of more than or equal to 2.7 multiplied by 109cfu/g; bacillus with effective viable count not less than 2.3 × 109cfu/g; photosynthetic bacteria havingThe number of effective viable bacteria is more than or equal to 8.4 multiplied by 109cfu/g; according to the weight ratio, the yeast: nitrifying bacteria: thiobacillus denitrificans: bacillus: photosynthetic bacteria were 6:35:20:32: 7.
The preparation in the embodiment is prepared by weighing medical stone and steel slag raw materials according to a formula, grinding the raw materials in a pulverizer, sieving the ground materials by a 40-mesh sieve, fully and physically mixing the undersize materials with lanthanum modified bentonite, calcium bentonite and a microbial inoculum according to the formula proportion, and uniformly stirring the mixture to obtain the component 2 composite ecological restoration agent.
When the preparation in the embodiment is used for carrying out in-situ remediation on certain lake sediment, the remediation method comprises the following steps:
s1: carrying out pollutant interception treatment on the area to be repaired, and separating the polluted area; after the sewage interception is finished, the water level of the treatment area is reduced to below 1 m;
s2: uniformly spreading the component 1, namely the base-modifying agent potassium hydrogen peroxyphosphate composite salt on the surface of the sludge layer, wherein the spreading amount is 65 g/m2；
S3: after 5 days, after the oxidation-reduction potential (ORP) of the water layer covering the sludge is increased to-60 mV and the dissolved oxygen in the water is stabilized to be more than 3mg/L, the component 2 composite ecological restoration agent is scattered, and the spreading amount is 120 g/m2；
S4: after 5 days, the number of the plants is 48 per m2Planting dwarf tape grass at a density of 40 clusters/m2The malayan eupatorium herb is planted at the density, the malayan eupatorium herb and the malayan eupatorium herb are planted in a close manner in a large scale, then the water level is lifted, the enclosure is removed, plant maintenance is carried out, and the ecological restoration of the black and odorous water body is completed.
S5: on the 280 th day of treatment, under the influence of heavy rain, 0.1 cubic meter of mixed flow sewage overflows into each cubic meter of lake, and the water quality indexes of the lake after being influenced by the overflow sewage are as follows: CODcr 29mg/L, ammonia nitrogen 2.91mg/L and total phosphorus 0.15mg/L, and the composite ecological restoration agent is added into the river channel immediately after overflow pollution occurs, wherein the supplement dosage is 20% of the first addition amount.
The comparative example 1 is basically the same as the example 2 in steps, and the only difference is that after the overflow pollution of lake entering occurs at 280 days of treatment in S5, 0.1 cubic meter of mixed flow sewage overflows into each cubic meter of lake, and the water quality indexes of the lake water after being influenced by the overflow sewage are as follows: CODcr 29mg/L, ammonia nitrogen 2.91mg/L, total phosphorus 0.15mg/L, and at this time, the composite ecological restoration agent is not added.
Analysis of results
The measures of example 2 and comparative example 1 are adopted for treatment, and the water quality of the lake is detected to change before and after 90 days and 280 days of artificial feeding of severely polluted water and 365 days of lake treatment respectively, as shown in tables 2 and 3.
Table 2 water quality before and after remediation by way of example 2
TABLE 3 Water quality before and after remediation by the comparative example 1
As can be seen from the table, the indexes of the lake water quality without adding the composite ecological restoration agent are obviously reduced after being influenced by the overflow sewage.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. An ecological composite bottom mud in-situ restoration agent is characterized by comprising a bottom-improving agent and a composite ecological restoration agent;
the bottom-improving agent is composed of potassium hydrogen peroxide phosphate composite salt, calcium peroxide or the combination of the two in any proportion;
the composite ecological restoration agent consists of 10-30% of growth promoting carrier, 5-15% of phosphorus locking agent, 1-5% of buffering agent and 50-84% of microbial agent by mass.
2. The ecological type composite bottom sediment in-situ remediation agent of claim 1, wherein the number of viable bacteria in the microbial agent is 1-9 x 109cfu/g。
3. The ecological type composite bottom mud in-situ restoration agent as claimed in claim 1, wherein the growth promoting carrier is Maifanitum, steel slag or a mixture of the Maifanitum and the steel slag.
4. The ecological composite bottom mud in-situ remediation agent of claim 1, wherein the phosphorus-locking agent is lanthanum-modified bentonite, and the lanthanum-modified bentonite comprises rare earth lanthanum and bentonite.
5. The ecological composite bottom mud in-situ remediation agent of claim 1, wherein the buffering agent is calcium bentonite.
6. The ecological composite bottom sediment in-situ remediation agent of claim 1, wherein the microbial agent comprises, in parts by weight: 5-10 parts of saccharomycetes, 25-40 parts of nitrobacteria, 15-20 parts of thiobacillus denitrificans, 30-40 parts of bacillus and 5-10 parts of photosynthetic bacteria;
the ratio of the growth promoting carrier to the microbial agent is 1-3: 1.
7. a process for restoring water bodies by using the ecological composite bottom sediment in-situ restoration agent as claimed in any one of claims 1 to 6, which is characterized in that the bottom-improving agent is added according to the oxidation-reduction potential of the bottom sediment, dissolved oxygen in water is stabilized to be more than 3mg/L after the bottom-improving agent is added for 3 to 15 days, the oxidation-reduction potential of the bottom sediment is increased to be more than-100 mV, and the composite ecological restoration agent is added when the water covering the bottom sediment is in a weakly alkaline condition.
8. The process for restoring a water body by using the ecological composite bottom mud in-situ restoration agent as claimed in claim 7, wherein the mixing amount of the bottom-improving agent is 50-250g per square meter of water surface;
the mixing amount of the composite ecological restoration agent is 1-15 kg per square meter of water surface.
9. The process for restoring a water body by using the ecological composite bottom sediment in-situ restoration agent as claimed in claim 7, which comprises the following steps:
firstly, carrying out pollutant interception treatment on an area to be repaired, and separating the polluted area to ensure that a treatment water body is relatively closed;
step two, in the first repairing stage, adding a bottom modifying agent according to the oxidation-reduction potential condition of the bottom sediment, adjusting the oxidation-reduction potential of the bottom sediment to be more than-100 mV by adopting a plurality of times of small adding modes, stabilizing the dissolved oxygen in water to be more than 3mg/L, maintaining the alkalescent condition of the water covered on the bottom sediment, and maintaining the repairing duration to be 3-15 days;
step three, adding a composite ecological restoration agent in a second restoration stage;
and step four, if a large amount of seriously polluted water is discharged into the river channel at the upstream in the period, adding the composite ecological restoration agent into the river channel, wherein the supplement dosage is 10-30% of the first addition dosage.
10. The process for restoring a water body by using the ecological composite bottom sediment in-situ restoration agent as claimed in claim 7 or 9, wherein if the water body is matched with submerged plants for planting, the submerged plants are planted 5-7 days after the composite ecological restoration agent is added.
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| CN115872578A (en) * | 2022-08-30 | 2023-03-31 | 中交第二航务工程局有限公司 | Sediment modifier for improving survival rate of aquatic plants and application thereof |
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