1. Canna, Myriophyllum, Coix lachryma, Coix lachryma, Acorus calamus, Arundo donax and other aquatic plants with purification function can grow normally and even purify sewage. (Sewage such as heavy metal pollution is not included)
2, ordinary terrestrial plants or aquatic plants, usually mild sewage has no obvious effect, some sensitive plants may grow poorly, and serious will lead to death.
What effect does impact load have on sewage? I hope to be friends with you and discuss sewage knowledge together.
What is the role of Top66 in wastewater biological treatment? The biological treatment method of wastewater is as follows:
1, biochemical method
Biochemical method refers to the treatment of wastewater containing heavy metals by microorganisms, which converts soluble ions into insoluble compounds and removes them. Sulfate bioreduction is a typical biochemical method. In this method, sulfate-reducing bacteria reduce sulfate to H2S through dissimilatory sulfate reduction under anaerobic conditions. Heavy metal ions in wastewater can react with generated H2S to generate metal sulfide with low solubility and be removed. At the same time, the reduction of H2SO4 can transform SO42- into S2-, thus improving the pH value of wastewater. Many heavy metal ion hydroxides precipitate because of their small ionic products. Relevant research shows that the removal rate of wastewater containing 30-40 mg/L Cr 6+ can reach 99.67%-99.97% [11]. Some people also use the anaerobic digestion sludge of livestock manure to treat heavy metal ions in mine acid wastewater. The results show that this method can effectively remove heavy metals from wastewater. Zhao Xiaohong et al. [12] used Enterobacter desulfurization (SRV) to remove copper ions from electroplating wastewater. In the solution with copper concentration of 246.8 mg/L and pH of 4.0, the removal rate reached 99. 12%.
2, biological flocculation method
Bio-flocculation is a decontamination method that uses microorganisms or metabolites produced by microorganisms to flocculate and precipitate. Microbial flocculant is a kind of metabolites with flocculation activity produced and secreted by microorganisms. Generally, it is composed of high molecular substances such as polysaccharide, protein, DNA, cellulose, glycoprotein and polyamino acid. Molecules contain various functional groups, which can make colloidal suspended substances in water coagulate and precipitate with each other. So far, there are about a dozen varieties that have flocculation effect on heavy metals. The amino and hydroxyl groups in bioflocculant can form stable chelates with heavy metal ions such as Cu2+, Hg2+, Ag+ and Au2+ and precipitate. The application of microbial flocculation in wastewater treatment is safe, convenient, non-toxic, without secondary pollution, with good flocculation effect, rapid growth and easy industrialization. In addition, microorganisms can be genetically engineered, domesticated or constructed with special functions. Therefore, microbial flocculation has a broad application prospect.
3, biological adsorption method
Biosorption is a method of absorbing metal ions dissolved in water by using the chemical structure and composition characteristics of organisms themselves, and then removing metal ions in aqueous solution through solid-liquid two-phase separation. Metal ions are separated by extracellular polymers. Protein released by some bacteria during their growth can transform soluble heavy metal ions into precipitates and remove them. Biological adsorbent is widely used because of its wide source, low price, strong adsorption capacity and easy separation and recovery of heavy metals.
4. Aerobic biological treatment method
Method for decomposing complex organic matter in wastewater by aerobic microorganisms under aerobic conditions. Typical organics in domestic sewage are carbohydrates, synthetic detergents, fats, protein and their decomposition products, such as urea, glycine and fatty acids. According to the numerical order of elements contained in biological systems, these organic compounds can be expressed as COHNS. All reactions in aerobic biological treatment of wastewater can be expressed by the following two formulas:
Microbial cells +COHNS+O2─→ More cells +CO2+H2O+NH3
These reactions in biological systems are accelerated by enzymes in biological systems. Enzymes can be divided into three types according to their catalytic reactions: oxidoreductase: it catalyzes the redox reaction of organic matter in cells, promotes electron transfer and combines it with oxidation or dehydrogenation. It can be divided into oxidase and reductase. Oxidase can activate molecular oxygen as a hydrogen acceptor to form water or hydrogen peroxide. Reductases include various dehydrogenases, which can activate hydrogen on the substrate and transfer hydrogen to the reduced substance through coenzyme, so that the substrate is oxidized and reduced by hydrogen receptors. Hydrolase: It plays a catalytic role in the hydrolysis reaction of organic matter. Hydrolysis is the most basic reaction outside the cell, which can decompose complex macromolecular organic compounds into small molecules and make them easily penetrate the cell wall. For example, protein is decomposed into amino acids, fats into fatty acids and glycerol, and complex polysaccharides into monosaccharides. In addition, there are deaminase, decarboxylase, phosphorylase and dephosphorase. Many enzymes can catalyze reactions only in the presence of special substances called coenzymes and activators. Potassium, calcium, magnesium, zinc, cobalt, manganese, chloride ion and phosphate ion are indispensable coenzymes or activators in many enzyme-catalyzed reactions. In the process of aerobic biological treatment, the organic matter in sewage is oxidized and degraded under the catalysis of microbial enzymes, which is divided into three stages: the first stage, organic macromolecules are degraded into constituent units-monosaccharides, amino acids or glycerol and fatty acids. In the second stage, the product of the first stage is partially oxidized to one or more of the following substances: carbon dioxide, water, acetyl coenzyme A, α-ketoglutaric acid (or α-ketoglutaric acid) or oxaloacetic acid (also called oxaloacetic acid). The third stage (that is, the tricarboxylic acid cycle, which is the last stage of organic oxidation) is that acetyl-CoA, α-ketoglutaric acid and oxalic acid are oxidized into carbon dioxide and water. Organic matter will release a certain amount of energy at each stage of oxidative degradation. At the same time of organic matter degradation, the synthesis of microbial protoplasm is also going on. In the first stage, the components of substrate decomposition can synthesize carbohydrates, protein and fat, and then further synthesize cell protoplasm. Synthetic energy is obtained by microorganisms in the process of organic oxidation.
5. Anaerobic biological treatment
It is mainly used to treat precipitated sludge in sewage, so it is also called [[〖HTK〗] sludge digestion [HT], and it is also used to treat high-concentration organic wastewater. This method decomposes the organic matter in sludge under the action of anaerobic bacteria or facultative bacteria, and finally produces gases such as methane and carbon dioxide, which are economically valuable energy sources. A large number of biogas digesters built in China are typical examples of applying this method. The digested sludge is easier to dehydrate than that in raw sludge, and the pathogenic bacteria contained in it are greatly reduced, the odor is obviously weakened, the fertilizer becomes quick-acting, the volume is reduced, and it is easy to dispose of. The complete anaerobic digestion process of municipal sewage sludge and high concentration organic wastewater can be divided into three stages (see figure). In the first stage, solid organic matter in sludge is dissolved by extracellular hydrolase secreted by anaerobic bacteria, and enters cells through cell walls for biochemical reactions of metabolism. Under the catalysis of hydrolase, complex polysaccharide is hydrolyzed into monosaccharide, protein into peptide and amino acid, and fat into glycerol and fatty acid. The second stage is to further degrade the products of the first stage into relatively simple volatile organic acids, such as acetic acid, propionic acid, butyric acid and other volatile organic acids, as well as alcohols and aldehydes under the action of acid-producing bacteria; Carbon dioxide is produced simultaneously with new microbial cells.
reaction principle
The first and second stages are also called liquefaction process. The third stage is to convert the volatile acid produced in the second stage into methane and carbon dioxide under the action of methanogenic bacteria, so it is also called gasification process, and its reaction can be expressed by the following formula:
Examples of gasification processes of some organic acids or alcohols are as follows: acetic acid:
CH3COOH─→CO2+CH4
Propionic acid:
4CH3CH2COOH+2H2O─→5CO2+7CH4
Methanol:
4CH3OH─→CO2+3CH4+2H2O
Ethanol:
2CH3CH2OH+CO2─→2CH3COOH+CH4
In order to make the anaerobic digestion process run normally, it is necessary to keep the temperature, pH value and redox potential within a certain range to maintain the normal activities of methanogenic bacteria and ensure that the volatile acids produced in the second stage can be completely converted into methane in time.
The speed of biochemical reaction is directly affected by temperature. There are two kinds of microorganisms that perform anaerobic digestion: mesophilic digestion bacteria and thermophilic digestion bacteria. The adaptive temperature range of the former is 65438 07 ~ 43℃, and the optimum temperature is 32 ~ 35℃. The latter has the fastest reaction speed at 50 ~ 55℃.
In recent years, anaerobic digestion has been developed to treat high-concentration organic wastewater, such as slaughterhouse wastewater, meat processing wastewater, sugar industry wastewater, alcohol industry wastewater, canned industry wastewater, sulfite pulping wastewater and so on. Compared with aerobic biological treatment, the cost is saved.
The specific methods of biological wastewater treatment include [HTK] activated sludge method [HT], [HTK] biofilm method [HT], [HTK] oxidation pond method [HT], [HTK] land treatment system [HT] and sludge digestion. 『HT』.
Can plants grow in the bedroom? What is the impact on Feng Shui? Generally, no plants are planted. At night, plants will compete with you for oxygen because of their breathing, which is not good for your health.
What's the effect of being touched by a dog's teeth? It depends on whether the skin is broken. If you have to get rabies vaccine, this kind of thing can be big or small. If you are not at ease, consult a doctor!
Q: What is the effect of LED plant lights on plant flowering? According to the research of Houyi energy saving, the wavelength of LED plant lamp is very suitable for plant growth, flowering and fruiting. Generally, indoor plants and flowers will get worse as time goes on, mainly due to lack of light. The LED lamp suitable for the spectrum needed by plants can not only promote the growth of plants, but also prolong the flowering period and improve the quality of flowers. The application of this efficient light source system in agricultural production such as greenhouse and greenhouse can not only solve the disadvantages of poor taste of greenhouse vegetables such as tomatoes and cucumbers due to insufficient sunshine, but also make greenhouse eggplant vegetables go on the market before and after the Spring Festival in winter, thus achieving the purpose of anti-season cultivation.
(1) As supplementary lighting, it can enhance the lighting at any time of the day and prolong the effective lighting time.
(2) Whether at dusk or at night, it can effectively prolong and scientifically control the light required by plants.
(3) In the greenhouse or plant laboratory, it can completely replace natural light and promote plant growth.
What effect does the treated sewage have on trees? It depends on the degree of water treatment and what kind of tree it is.
1, if it is treated well, it has no influence (the water pollution degree after treatment is within the self-purification ability of the tree).
If it is not handled well, it will obviously affect the biochemical reaction of the tree and make the tree poisoned.
2. If the tree is not a fruit tree, there should be no problem.
If the tree is a fruit tree or an ornamental tree, the impact of sewage will be serious ... definitely.
What effect does LED light have on plants? KnowLEDge of led plant lights:
1. Different wavelengths of light have different effects on plant photosynthesis. The wavelength of light required for plant photosynthesis is about 400-700 nanometers. Light of 400-500nm (blue) and 6 10-720nm (red) contributed the most to photosynthesis.
2. Blue (470 nm) and red (630 nm) LEDs can just provide the light needed by plants. Therefore, the ideal choice for LED plant lights is to use the combination of these two colors. Visually, the red and blue combination of plant lights is pink.
3. Blue light can promote the growth of green leaves; Red light helps to blossom and bear fruit and prolong the flowering period.
4. Generally, the ratio of red and blue LEDs of LED plant lights is between 4: 1-9: 1, and 4: 7: 1 is usually optional.
5. When lighting plants with plant lamps, the height from the leaves is generally about 0.5 meters, and continuous irradiation of 12- 16 hours every day can completely replace sunlight.
Proportional colored lights can make strawberries and tomatoes sweeter and more nutritious. Illuminating holly seedlings with light is to imitate the photosynthesis of plants outdoors. Photosynthesis refers to the process that green plants use light energy through chloroplasts to convert carbon dioxide and water into organic substances that store energy and release oxygen. Sunlight is composed of different colors of light, and different colors of light will have different effects on the growth of plants.
LED light source, also known as semiconductor light source, has a narrow wavelength and can control the color of light. Using it alone to irradiate plants can improve plant varieties.
After the experiment, the seedlings of Ilex pubescens grew the highest under the purple light, but the leaves were shallow and looked malnourished. The seedlings in yellowish light are not only short, but also the leaves look lifeless. Holly growing under the mixed light of red and blue is the best, not only strong, but also has a well-developed root system. The red bulb and blue bulb of this LED light source are configured according to the ratio of 9: 1.
The results showed that the red and blue light of 9: 1 was the most favorable for plant growth. After strawberry and tomato are irradiated by this light source, the fruits are full, the contents of sugar and vitamin C are obviously increased, and there will be no hollow phenomenon. After continuous irradiation 12- 16 hours every day, the taste of strawberries and tomatoes grown under this light source will be better than that of ordinary greenhouse fruits.
LED plant growth lights can also be used to supplement light sources for plants in rainy weather in winter.
What effect do plants have on temperature? From a large area of vegetation on the surface, plants have a great influence on the temperature, and the surface temperature can be adjusted not to be too high or too low. According to the data, the summer temperature in Changsha is 3-4 degrees lower than that in other cities under the same conditions. This is because there are more surface vegetation in Changsha than in other cities, and the forest area in the north has blocked the cold current in Siberia, which makes the temperature in the south of the forest area relatively high by several degrees, so the influence of plants on the temperature is benign, so we should cherish them and protect them.
What kind of plants purify sewage is also a process. Wetland ecological purification of sewage, constructed wetland is the use of wetland ecosystem and diverse animal and plant communities to purify sewage. It is a complex and diverse effect, and reed, water lake lotus and so on are more effective.