2. Biofiltration deodorization technology
3. Double ion deodorization technology
4. The principle of natural plant liquid deodorizing chemical scrubber is that strong acid (sulfuric acid), strong alkali (sodium hydroxide) and strong oxidant (sodium hypochlorite) are used as washing spray liquid to make gas-liquid contact with odor molecules in gas, so that odor components in gas phase are transferred to liquid phase, and odor substances are removed through neutralization, oxidation or other chemical reactions between chemical substances and odor components. Odor substances that can be treated by chemical washing include organic sulfur compounds, nitrogen-containing compounds, organic acids, oxygen-containing hydrocarbons, halides and other waste gas substances. Suitable for sludge treatment, food, petroleum, chemical, pharmaceutical and other industries.
(1), washing equipment
The commonly used chemical washing equipment is packed tower. The chemical absorption liquid is sprayed downwards from the top of the tower, and the waste gas flows upwards. The odor fully contacts and reacts with the absorption liquid to be removed. The ratio of absorption liquid to waste gas flow (liquid/gas ratio) is generally 1-3 L/m 3, the packing height is generally 2-5 meters, and the empty gas tower speed is generally 0.5-1m/s. A well-run packed tower can deodorize more than 90%.
(2), chemical absorbent
Commonly used chemical absorbents include the following:
(1) alkaline solution
Alkaline absorption solution usually contains 1~ 10% sodium hydroxide, which is very effective for eliminating hydrogen sulfide. Other substances, such as methyl mercaptan, methyl sulfide, methyl disulfide and lower fatty acids, often cause odor in sewage treatment plants, and good treatment results can be obtained by this method.
(2) acidic solution
Pickling is mainly used to eliminate the odor generated by alkaline gases such as ammonia and trimethylamine, and generally sulfuric acid (0.5-5% solution) is used as the cleaning solution.
(3) Sodium hypochlorite solution
Sodium hypochlorite is generally used with acid-base absorption solution. For methyl sulfide which is difficult to be eliminated by other methods, sodium hypochlorite absorption solution has a good control effect. When the sewage treatment plant treats high-concentration odor, the concentration of sodium hypochlorite solution (available chlorine concentration) is about 500 ~ 2000 ppm；; When treating low-concentration odor, the concentration of sodium hypochlorite solution is about 50~500 ppm. From the performance of various oxidants, sodium hypochlorite is the cheapest and has a good effect, so it is the most commonly used.
Sodium hypochlorite in solution exists in the form of hypochlorous acid (HOCl):
NaOCl+ H2O→HOCl+ NaOH ......
At pH=7.5, the available chlorine in hypochlorite solution exists in the form of 50% HOCI and hypochlorite ion (OCl-). When pH=l0, only 0.3% of available chlorine exists in the form of HOCl; When pH=l 1 or 12, HOCl is almost completely dissociated into useless hypochlorite ions, so the control of pH value is very important.
Two. Biofiltration deodorization technology
Biofiltration deodorization process adopts "microorganism" degradation technology, which uses deodorizing microorganisms growing on filter materials to degrade H2S, SO2, NH3 and most volatile organic odors, and the deodorization rate can reach 98%-99%. The service life of the system is over 10 year, and it can work normally in the outdoor range of -20℃-40℃. It can run continuously all year round and 24 hours a day, and its treatment process does not produce secondary pollution. Moreover, the system occupies a small area and saves land resources. The theme of the treatment system is made of FRP and has good corrosion resistance.
The core of the biofiltration deodorization system is a high-efficiency biofiltration (pool) tower, a composite filler which is beneficial to biological attachment and growth, and dominant microbial strains. Under suitable environmental conditions, microorganisms in the filter (pond) tower form biofilms on the surface of the packing, and inorganic and organic substances in the waste gas are used as carbon sources and energy sources to maintain their life activities by degrading malodorous substances, and the malodorous substances are decomposed into odorless substances such as water, carbon dioxide and minerals to achieve the purpose of purifying malodorous gases.
Biodegradation process
1. Gas-liquid diffusion stage: malodorous gas substances are adsorbed or absorbed by microorganisms on the filler and transferred from gas phase to biological phase;
2. Liquid-solid diffusion stage: the malodorous gas substance contacts with water on the surface of the filler-biofilm of the biological filter (tank) tower and dissolves in the water, and the H2S dissolved in the water is adsorbed by the organisms living in the filler and transferred from the liquid phase to the biological phase;
3. Biological oxidation stage: The microorganisms in the biofilm formed on the surface of the biological filler feed on malodorous gases, and the malodorous substances and VOCS are oxidized and decomposed by biological microorganisms, generating energy in the transformation process, providing energy for the growth and reproduction of microorganisms in China, so that the transformation of malodorous gases can be sustained.
primary objective
Odor inorganic gases: including hydrogen sulfide, ammonia, mercaptan, sulfide, etc.
Non-volatile odorous organic gases: organic benzene, toluene, chlorobenzene, lower aliphatic hydrocarbons, alcohols, aldehydes, etc.
Volatile and odorous organic compounds: sulfur-containing organic compounds (thiols and thioethers), nitrogen-containing organic compounds (amines and amides), oxygen-containing organic compounds (alcohols, ethers, ketones and aldehydes), hydrocarbons (aliphatic hydrocarbons and aromatic hydrocarbons) and halogen organic compounds. Double ion air purification system is a high-tech abroad, which can effectively remove bacteria, inhalable particles, sulfur compounds and other harmful substances in the air. Its core device is the bioclimatic ion air purification system, and its working principle is that the ion generator placed in the equipment emits high-energy positive and negative ions, which can contact with volatile organic gas molecules (VOC) in the air, open the chemical bonds of VOC molecules and decompose them into carbon dioxide and water; It also decomposes hydrogen sulfide and ammonia; Ion emitted by that ion generate device collide with dust particles and solid particles in the air, so that the particles are char and polymerized, and larger particles are formed to settle down by their own gravity, so as to achieve the purpose of purification; The emitted ions can also interact with indoor static electricity and odor, and at the same time effectively destroy the living environment of bacteria in the air, reduce the indoor bacterial concentration and completely eliminate it.
The equipment has filtering function: the precise filtering device installed in the suction channel separates soil particles from the air; Photoelectric disinfection function: through electrochemical oxidation, "cold combustion" and photoelectric catalytic oxidation, the activity of pathogenic bacteria and organic odor components are removed at the same time; Catalytic oxidation: after further photoelectric oxidation of air, the photoelectric oxidation effect is consolidated; Double regulation function: increase the active oxygen content in indoor air through special ionization tube. This process regulates and focuses on natural and healthy air ions, continuously disinfects indoor air and electrical surfaces, and effectively removes odor.
Composition of double ion air purification system
The dual-ion deodorization system is mainly composed of gas collection system, air filter, ion generator, fan, control device, waste gas discharge device and so on.
Double ionization double ion generator
The double ion generator consists of three functional parts, namely, a filtering part, an emitting part and a fan part. Specifically, it consists of an air filter, a double negative ion emitting base, an ion tube, a fan, etc. The air filter will absorb dust particles in the exhaust gas and reduce the humidity of the exhaust gas, thus not affecting the service life of the ion tube. Ion generator is an emitting electrode made of high-tech materials, which can produce high concentration of positive and negative oxygen ions (also called active oxygen), and react with the waste gas filtered by air filter for decomposition and oxidation, thus fundamentally eliminating pollution.
Air filter is a high-quality product produced by biaoclimaic company, which has the characteristics of high filtration efficiency, low pressure loss and small overall volume. The pressure loss of this filter material is less than 5mmH2O, which can reduce the energy consumption and noise of the whole system.
In general, the service life of emitter electrode made of high-tech materials is more than 15 years, and the service life of ion tube is as high as 20000 hours.
The box of deodorizing equipment is made of 304 stainless steel. Meet the requirements of stiffness and strength, beautiful appearance.
Deodorization equipment should be placed indoors or heat preservation measures should be taken to avoid condensation due to large temperature difference between indoor and outdoor smells in winter.
Technical characteristics and advantages
The bio-climatic dual-ion deodorization technology we adopted is mature and reliable. Deodorization system can inhibit the activity of bacteria and viruses, eliminate odor, eliminate static electricity, reduce inhalable particles in the air, improve the ion concentration of indoor air and increase air freshness. And ensure that the provided ion deodorization system will not generate ozone, have no adverse effects on human body and air, and will not bring secondary pollution.
The bioclimate dual-ion deodorization system has reached the national standard in all designated deodorization spaces. The gas emission after deodorization meets the national standards GB 189 18-2002 and GB3095-96.
The bioclimate dual-ion deodorization system can remove more than 95% of H2S, NH3 and other gases, and can also remove more than 85% of other VOC gases.
The bioclimatic dual-ion deodorization system can work continuously at rated air volume, with the service life of the main engine exceeding 15 years and the service life of the ion tube as high as 20,000 hours. There is no abnormal noise during the operation of the ion deodorization equipment, and the noise generated within a radius of one meter during the operation of the ion deodorization equipment is ≤50dB.
The installed power of biaoclimatic dual-ion deodorization system is very low, and each treatment 1000m3/h (including fan) is below1.0kw..
The materials we use are environment-friendly and corrosion-resistant, and the box of deodorization equipment adopts all stainless steel 304. The protection level is as specified in GB/T 4942.2- 1993, which fully meets the protection level of IP55. The heat resistance grade of insulating material is F grade.
According to GB J19-87 (version 2001) Code for Design of Heating, Ventilation and Air Conditioning, we strictly follow the requirements of the code to ensure that the air leakage rate of the air duct is completely lower than 19%. The ion deodorizing device has good air tightness.
The ion generator in the biaoclimatic dual-ion deodorizing system we provided is imported, and its performance indexes meet the European electrical safety standards SCES 035(EN450 1 1) and SIS 026(45004).
Deodorization equipment adapts to the overall layout of deodorization points, fully meets the requirements of design drawings, and ensures the daily operation and maintenance space of the equipment. Under the normal operation of the equipment, manual operation is basically unnecessary.
The equipment runs stably and has strong impact load resistance. When the equipment stops running, overhauls or replaces wearing parts, it can resume normal use in a short time.
The biaoclimatic dual-ion deodorization system provided by us does not contain any materials or chemicals that may cause or may cause secondary pollution, and there is no waste water or any other secondary pollution after treatment.
The biaoclimatic dual-ion deodorizing system we provide can completely meet the requirements of deodorizing equipment in any season and under any climatic conditions.
Forced diversion design: the forced diversion design of the internal structure of the purifier ensures that the inhaled air passes through the predetermined path and completes each step of the purification process. ZY-DL multiple technology ensures the best effect of each step and removes harmful substances in the air.
Adjustment function: adjust the air purification degree according to the real indoor air quality, and manually adjust according to the basic settings. In the early 1970s, foreign countries began to extract juice from pure natural plant liquid to eliminate malodor, and successfully obtained various plant extracts that can eliminate different odors of various edible natural plants. Since 1975, the patented core technology-preparing working fluid with more than 350 kinds of natural plant extracts to eliminate odor in the air has been used in more than 40 countries and regions around the world to eliminate various environmental odors, especially those emitted by organic substances. Its important feature is that it can quickly eliminate odor rather than temporarily cover it up.
Natural plant liquid products are extracted from pure natural plants, which are non-toxic and harmless to human body and will not cause various adverse reactions such as skin or respiratory tract allergies. They are reliable environmental protection products and meet international health standards.
Natural plant extracts can be designed according to different workplaces and public places, different odor sources and targeted technologies to remove odors and keep the air environment clean.
Composition of natural plant extracts
In the odor control technology of natural plant extracts, the working fluid used is a series of plant extracts, which are organic substances with odor extracted from plants such as trees, grasses and flowers.
These odorous organic compounds contain a large number of complex compounds, which are the main components of most vegetable oils and can be divided into four categories:
(1) Terpenes: These naturally occurring compounds are the most important components in vegetable oil. They all have the same empirical formula C 10H 16. Such as pinane and menthane.
② Linear compounds: The compounds that make up this part are aldehydes, alcohols and ketones. They exist in a series of volatile vegetable oils extracted from fruits. Such as sunflower alcohol and lauryl alcohol.
(3) Benzene derivatives: The molecular formula of these compounds is the same as that of benzene, especially the compounds derived from propylbenzene. Such as acetate.
④ Other compounds: Examples of the fourth category are vanillin, cinnamic acid and geranyl formate working solution.
Brief introduction of deodorization process principle of natural plants
After the natural plant extract deodorizing equipment is atomized, the natural plant extract forms a fog shape, and the radius of droplets dispersed in space is ≤ 0.04 mm, and the specific surface area and surface energy of droplets are large. The average is about tens of kilocalories per mole. The energy of this order of magnitude is 1/3- 1/2 of the bond energy in many elements. The surface of the solution can not only effectively adsorb odor molecules in the air, but also change the three-dimensional configuration of the adsorbed odor molecules, weaken the chemical bonds in the odor molecules, increase the instability of the odor molecules, easily react with other molecules, and finally generate odorless and nontoxic organic salts. For example, hydrogen sulfide reacts with plant liquid to generate sulfate ions and water; Ammonia generates nitrogen and water under the action of plant liquid.
The effective molecules contained in natural plant extracts are plant extracts, and most of them contain multiple yoke double bond systems, which have strong ability to provide electron pairs, thus increasing the reactivity of odor molecules.
Odor molecules adsorbed on the surface of natural plant extract contact with oxygen in the air. At this time, odor molecules increase their reactivity and change the reaction mechanism with oxygen for the above two reasons, so they can react with oxygen at room temperature.
The reaction between natural plant extracts and odor molecules can be expressed as follows:
A. Acid-base reaction: If the plant extract contains alkaloids, it can react with acidic odor molecules such as hydrogen sulfide. Different from ordinary acid-base reaction, ordinary alkali is toxic, inedible and biodegradable. However, natural plant extracts are biodegradable and non-toxic.
B. Catalytic oxidation reaction: For example, under normal circumstances, hydrogen sulfide cannot react with oxygen in the air. But under the catalysis of natural plant extracts, it can react with oxygen in the air. Take the reaction of hydrogen sulfide as an example:
R-NH2+H2S R-NH3+ + SH-
R-NH2+SH-+O2+H2O R-NH3+SO42-+OH-
R-NH3++OH- R-NH2 +H2O
Another example is the oxidation reaction of mercaptan in air:
R-SH (air) +O2 →R-SS-R (slow)
R-SH (natural plant extract) +O2 →R-SS-R (quick)
C. Lewis acid-base reaction. In organic chemistry, molecules or atomic groups that can absorb electron clouds are called Lewis acids. In organic sulfur compounds, the outer layer of sulfur atom has an empty orbit, which can accept foreign electron clouds, so this kind of organic matter can be called Lewis acid. On the contrary, molecules or atomic groups that can provide electron clouds are called Lewis bases. Generally negatively charged atomic groups, nitrogen-containing organic compounds belong to Lewis base. For example, the reaction between phenylsulfide and natural plant extracts belongs to this category. Phenyl sulfide is a Lewis acid, and the nitrogen-containing compound in it belongs to Lewis base. Both can react.
D. discuss it from a thermodynamic point of view. The diameter of atomized droplets of natural plant extracts is 0.04 mm In this case, the surface energy of droplets reaches one-third and one-quarter of the bond energy of some organic compounds, respectively. In this case, the bonds in the odor molecules are destroyed and become unstable and easy to decompose.
E. redox reaction. For example, formaldehyde is oxidized, and some effective molecules in natural plant extracts are reduced. They can react directly.
Reaction with formaldehyde and ammonia: h
R-NH2+HCHO R-HN2+H-C=CO2+H2O
Ammonia +N2+H2O
Theoretically, plant liquid can eliminate any odor gas, which works by the following forces: 1. Van der Waals force; 2. Coupling force; 3. Chemical reactivity; 4 Attraction
The deodorization of plant liquid has the following stages: the plant liquid combines with odor molecules through van der Waals force, and the odor molecules are eliminated because of chemical reaction with plant liquid.
In addition, natural plant deodorant can also eliminate chlorine and carbon dioxide by generating corona around particles. After corona is generated, the combination of gas molecules and plant liquid is removed.
Safety and superiority of natural plant liquid deodorization technology
Plant extracts and various odor molecules in the air decompose rapidly, and the decomposition products are harmless substances, such as water, oxygen and nitrogen. The working liquid of plant extract is characterized by rapidly decomposing odor molecules in the air, rather than masking odor.
Plant extract is a non-toxic and harmless liquid, which has been recognized by 40 countries and regions around the world after rigorous testing. It is agreed that plant extracts are safe, non-toxic, non-irritating and non-flammable.
Natural plant liquid deodorization technology is not only less investment, convenient operation, but also wide applicability, occupying less land, and does not need to change, increase structures and attach more facilities. The invention does not need to consume a lot of electric energy, is safe and simple to use, is convenient for workers to operate, only needs to replenish working fluid regularly, and the maintenance and operation cost of the whole system is low. Odor control system is not only suitable for closed indoor space, but also suitable for large and oversized outdoor space.
Advanced system technology
Because of the different odor sources, the requirements for the selection, dosage and treatment of plant liquid are also different. The main factors affecting the therapeutic effect are: 1. Odor concentration (ppm); 2. The speed of air flow; 3. Solubility of odor; 4. Molecular weight of odor; 5. Odor molecular density; 6. Composition of odor structure. Only by adopting targeted system technology according to different situations can we meet all kinds of deodorization requirements.
Spatial atomization method: the plant extract is atomized in air with micron-sized particle size through a special atomization control system, and the atomized molecules are evenly dispersed in the air, absorbing odor molecules in the air and undergoing chemical reactions such as decomposition, polymerization, substitution, replacement and addition with odor molecules, so that the odor molecules change their original molecular structure and lose their odor. The process of this system can not effectively control the pollution of malodorous gas overflowing from malodorous sources to the surrounding environment, and it is suitable for malodorous sources with medium scale and concentration. The construction investment is less and the operation cost is higher.
Collection evaporation method: the plant extract is evaporated by a special evaporator and dispersed in the container, and the malodorous gas is sucked into the container by the induced draft fan through the collection pipeline, then mixed with the gaseous plant extract dispersed in the container and discharged through the exhaust port, thus eliminating the odor. The process of the system can effectively control the pollution of odor overflowing from odor sources to the surrounding environment, and is suitable for odor sources with low odor concentration and small odor quantity; The construction investment is moderate and the operation cost is low.
Washing and filtering method: the diluted plant extract in the liquid storage tank is pumped to the nozzle in the washing container through the circulating pump for spraying, and the spraying liquid returns to the liquid storage tank through the packing layer, and then is circulated by the circulating pump. The induced draft fan sucks the malodorous gas into the washing container through the collection pipeline, and after the malodorous gas is evenly distributed by the gas distribution plate, it travels in the reverse direction with the spray liquid and enters the packing layer. The airflow is cut and divided in many directions, and fully contacts and reacts with the diluted plant extract on the surface of the filler. At this time, the malodorous gas flows slowly and stays in the container for a long time, forming a semi-liquid phase, which is filtered by the filler with plant extracts on the surface. The malodorous gas flowing from the packing layer is washed by the spray liquid and discharged through the exhaust port, thus eliminating the odor. The process of the system can effectively control the pollution of the odor overflowing from the odor source to the surrounding environment, and the treatment effect is remarkable, which is suitable for the odor source with high odor concentration and large odor quantity; The construction investment is slightly higher and the operating cost is lower.
Scope of application of natural plant deodorizing liquid
The case proves that natural plant deodorant is a kind of deodorant with good effect. After contact with it, the contents of hydrogen sulfide, ammonia and other odors will be reduced by 95%, and the contents of sulfur dioxide, ethanol sulfur and methanol sulfur will be reduced by 97%. Therefore, it is widely used for deodorization in various sewage treatment plants (stations), garbage disposal transfer stations, garbage landfills, composting plants, sludge storage areas and other places, as well as petroleum, chemical, synthetic rubber, pharmaceutical, food processing and so on.