The technical requirements of the biofilter include

The following is an example of a biofilter course design manual: * * 1. Design background and goal ** Biological filter was an effective sewage treatment technology, which aimed to remove the impurities in the sewage through the action of microorganisms. The goal of this course is to design a biofilter system that meets specific water quality requirements and treatment volume. * * 2. Design basis and basic data ** 1. * * Waste Water Flow and Quality ** - It is necessary to clearly design the sewage flow rate (for example, Q = 12000 m3/d) and the water quality of the incoming water, including the concentration range of various indicators such as chemical oxygen demand (Biochemical oxygen demand (BOD5), total nitrogen (TN), total Kjeldahl nitrogen (KN), nitrogen dioxide, nitrogen dioxide, nitrogen nitrogen, and organic nitrogen (for example, COD5 <60 </strong>, BOD5 </strong></strong></strong>, etc.). 2. * * Craftsmanship Requirement ** - For example, when using the biological nitrogen removal process such as sublimation and dehydration, the technical requirements such as BOD5: TN> 4 must be met, and when the carbon source is insufficient, additional carbon sources (such as methanoi, acetic-acid, etc.) must be considered. * * 3. Selection of biofilter type ** 1. * * Comparisons between ordinary biofilter (low-load biofilter), high-load biofilter and tower biofilter ** - Ordinary biological filter had low hydraulic load and organic load, good purification effect, but occupied a large area and was easy to block. - The high-load biofilter could improve the hydraulic load by means of water return treatment and other measures to solve the blockage problem. The high load referred to the hydraulic load rather than the organic load. The treated water return had many functions such as thinning the concentration of the incoming water and preventing the blockage of the filter material. When the hydraulic load was less than the specified value, the concentration of the organic matter in the raw water was higher than 200g/L, or the treated water could not meet the water quality discharge standard, it needed to return. - The tower biofilter could make the sewage, the biological film and the air fully contact, the water flow turbulence was fierce, and the ventilation conditions were improved. - According to the sewage flow, water quality, treatment requirements and other factors, select the appropriate type of biological filter (for example, if the treatment water volume is large and the organic load is high in this design, the high-load biological filter can be considered). * * 4. Design Calculation ** 1. * * Calculation of Denitration Biofilter (GN pool)** - * * Calculating according to the volume load method of detoxification ** - First, determine the parameters in the formula: A = W/H0, W = Q * ▽ GN/(1000 * qTN), where A is the total area of the filter (m2), W is the total volume of the filter material (m3), H0 is the filling height of the filter material (m), ▽ GN is the difference in the concentration of nitrate-nitrogen in the feed and outlet water of the detoxification filter (m/L), Q is the design sewage flow (m3/d), and qTN is the volume load (KgNO3-N)/m3. d. - Confirm the concentration of nitrate-nitrogen in the water and the water (for example, take the maximum concentration of nitrate-nitrogen in the water and the minimum concentration of nitrate-nitrogen in the water), and then calculate it. - According to the standard value, determine the volume load qTN of detoxification (for example, qTN = 0.8KgNO3-N/(m3. d), the value range is (0.8 - 1.2) KgNO3-N/(m3. d)). - The total volume of the filter material W, the filling height of the filter material H0 (for example, H0 = 3.5m, the value range is (2.5m-4.5m)), the total area of the filter tank A, the number of filter tanks n (for example, n = 2), and the area of a single tank W0 are calculated. - * * Based on the time spent on the empty bed ** - Confirm the parameters in the formula A = QL/24q, and q = H0/t, where QL is the sum of the design sewage volume and the digestive fluid return flow (m cubic meter/d), t is the empty bed hydraulic residence time (h), and q is the filter's hydraulic surface load (m cubic meter/m2. h), namely the filtering speed (value range: 8.0 - 10), including return flow. - Confirm the mixed liquid return ratio R (for example, R = Mu/1-Mu, the value range is 100%-400%, take 200%), and the filter's hydraulic surface load q (for example, q = 8.0m3/(m2. h)). - Calculating the total area of the filter tank A and the empty bed residence time t. - * * Denitration biological filter confirmed ** - According to the comparison of the two methods for calculating the filter area, the larger one shall be selected to determine the total area, quantity and single pond area of the biological filter (if the total area is 193 m2, the value is 200 m2, the quantity is 2, and the single pond area is 100 m2). - Confirm the height of the filter, H = H0 + h0 + h1 + h2 + h3 + h4, where h0 is the height of the supporting layer (m)(The value range is 0.3 - 0.5m), h1 is the height of the buffer water distribution area (m)(the value range is 1.35 - 1.5m), h2 is the height of the clear water area (m)(the value range is 1.0 - 1.5m), h3 is the super high (m)(the value range is 0.3 - 0.5m), h4 is the thickness of the filter plate (m)(for example, the total height of the designed filter pool is H = 7.0m). - Confirm the size (such as 10000 mm * 10000 mm * 7000 mm), quantity, and structure (such as steel concrete). - * * Design of Backwash for Denitration Biofilter ** - Confirm the air flushing intensity (such as 12 - 16L/m2. S, the design uses 12L/m2. S), and calculate the air volume Q of the single tank. - Confirm the washing intensity (such as 4 - 6L/m2. S, the design uses 4L/m2. S), and calculate the washing water volume Q of a single pool. - * * Long handle filter design ** - Confirm the filter plate specifications (such as 980 * 980 * 1000mm), the number of filter heads (such as 49 per piece), and calculate the total number of filter heads. - * * Additional carbon source design ** - The amount of nitrogen removed by the biological filter per day was calculated, and the amount of methanoi added per day was calculated based on the amount of methanoi added per 1 milligram of nitrate-nitrogen (for example, 3 milligrams). 2. * * Calculation of the Biological Aerated Nitration Filter (N-tank)** - * * Calculating according to the volume loading method of nitration ** - Similarly, the parameters were determined according to the formula A = W/H0, W = Q * ▽ CTKN/(1000 * qNH3-N), where ▽ CTKN was the difference in Kjeldahl nitrogen concentration between the input and the output of the nitration filter (kg/L), and qNH3-N was the nitration volume load (KgNH3-N)/m. d. - The total Kjeldahl nitrogen concentration of the water and the water was determined, and the ▽ CTKN was calculated. - According to the standard value, determine the volume load qNH3-N (for example, qNH3-N = 0.6KgNH3-N/(m cubic. d), the value range is (0.6 - 1.0) KgNH3-N/(m cubic. d)). - The total volume of the filter material W, the filling height of the filter material H0, the total area of the filter tank A, the number of filter tanks n, and the area of the single tank W0 were calculated. * * 5. Biological filter structure design ** 1. * * Filtrating bed ** - Choose a suitable filter material. The ideal filter material should have the properties of providing a large surface area for the attachment of microorganisms, allowing the sewage to flow through the biological membrane in the form of a liquid membrane, having sufficient void ratio, not being decomposed by microorganisms, having good biochemical stability, having a certain mechanical strength, and being cheap. You can choose fist-shaped filter materials (such as gravel, pebbles, slag, coke, etc.) or plastic filter materials. 2. * * Pool wall ** - It was built with bricks, rubble, concrete, or pre-cast slabs and blocks. Its purpose was to surround the filter material to protect the water distribution. 3. * * Pool bottom, water distribution equipment and drainage system ** - According to the filter type and design requirements, the corresponding design should be carried out to ensure the uniform distribution of sewage and the effective discharge of treated water. * * 6. conclusion ** 1. * * Design parameters summary ** - The main design parameters of the biofilter were summarized, such as filter size, filter material volume, hydraulic load, volume load, etc. 2. * * Analysis of sewage treatment effect ** - According to the design calculation results and the water quality of the incoming water, analyze and predict the removal effect of various indicators after the sewage treatment, and whether it meets the expected requirements of the water quality. 3. * * Evaluation of scheme design ** - The rationality and feasibility of the entire biofilter design were evaluated, including the process selection, the accuracy of the design calculation, the rationality of the structural design, and the possible improvement direction. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The open-pit mining operation mainly included the processes of drilling, blasting, mining, loading, transportation, and dumping. According to the continuity of the work, it could be divided into intermittent, continuous, and semi-continuous. For different types of deposits, the mining technology requirements were different. Among the mining methods for flat deposits (the dip angle is generally less than 12°), the intermittent mining process is suitable for various geological ore and rock conditions; the continuous mining process has high labor efficiency and is easy to realize the automatic production process, but it can only be used for soft ore and rock; the semi-continuous mining process has the characteristics of the above two, but in hard rock, it needs to increase the link of mechanical crushing of rock. In the top-dump mining method, the characteristics of mechanical shovels and draglines should be considered to reasonably arrange the equipment combination. For example, when stripping high steps, due to the relatively light dragline shovel, the dragline shovel should be used more often. According to the needs, a mechanical shovel with a dragline shovel, two draglines with each other, or only one dragline shovel as a secondary top-dump plan could be used. The horizontal mining method had to consider the restrictions of the specifications of the stripping material transportation equipment (such as the dump bridge and the boom dump truck) on the spatial relationship between the stripping bench and the mining bench. In addition, different mining technologies had certain requirements for equipment, such as the drilling diameter of large-scale high-efficiency roller drills reaching 380 - 444mm; the charging vehicle that could mix cheap explosives and waterproof explosives on the spot; the mechanical shovel, the hydraulic shovel, and the front loading machine must have suitable bucket capacity; the electric locomotive, traction unit, self-tipping car, and dump truck must have suitable load capacity; and there must be corresponding bulldozers, shifters, graders, scrapers, and other supporting equipment. In the mining process, the optimization of relevant economic indicators such as production stripping ratio and bench height, as well as the balance and control of resource recovery rate, mining cost, mining efficiency, etc. needed to be considered. If you want to know more about the follow-up, click on the link and read it!

Before the installation of the Red Net Bridge, the overall installation design concept, the installation of geological and geomorphological investigations, and the investigation of the changes in the water needed to be done in advance. The relevant tools should be prepared during installation, and the safety of the construction team should be guaranteed at any time. In the process of filling and surveying the installation of the Red Net Bridge, it was necessary to ensure that every pier in the water had a necessary hole. The holes installed on the Red Net Bridge on the ground had to ensure the relative density. It was also necessary to ensure that the holes were hit in the solid rock layer. It was also necessary to analyze whether the soil layer would change according to the survey situation. As long as the construction workers had sufficient technical knowledge and construction ability, they could carry out the specific installation work. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

To include a novel in Qidian, the following requirements must be met: - Originality: The work must be original, plagiarism, transportation, reprinting, etc. are prohibited. - [Restrictions on content: No sensitive content such as politics, religion, or eroticism.] - To be included in the New Books Ranking, the author must have an A-rank contracted work at Qidian, have two or more published works after becoming a Qidian author, have a total word count of less than 200,000 words, and have been updated every three days within 30 days of joining Qidian's library. - For the public author rankings, the author must publish two or more non-contracted works after becoming a reading author (including Qidian, Genesis, and Yunqi platforms). The total word count must be less than 200,000 words. The new works must be updated every three days within 30 days of joining Qidian's library. - If a new author signed a contract to be included in the new book list, it had to be the first contracted work published by the author after becoming a reading author. The authorization status had to be updated every three days within 30 days after the contract was changed to A. - For new authors to be included in the new book rankings, it had to be the author's first work after becoming a reading author, and it had to be a non-contracted work (including Qidian, Genesis, and Yunqi platforms). The total word count had to be less than 200,000 words, and it had to be updated every three days within 30 days of joining Qidian's library. As long as the content of the novel did not violate the law, it could be published directly on the platform. Every uploaded work would receive the attention of the corresponding section editor. The editor might add the author's contact information or directly invite the author to sign a contract through the notification bar of the reading section.

In principle, the length of service for a major general was now 60 years old. If necessary, the army could extend his retirement. If it was due to work needs and other reasons, they could also retire early after approval. The novel " The General's Promotion " is equally exciting. Everyone is welcome to click and read it!

For top-notch manga printing, you need advanced printing equipment that can handle fine details and consistent ink distribution. Also, a skilled prepress team for image optimization is crucial. The choice of paper type and thickness affects the final look and feel of the manga.

To apply for the Pharmacist Examination (Professional Qualification Examination for Pharmacists) with a secondary school degree, the following conditions must be met: to obtain a secondary school degree in pharmacy, traditional Chinese medicine or related majors, and to work in pharmacy or traditional Chinese medicine for at least 7 years, you can participate in the Pharmacist Qualification Examination. At the same time, you need to pay attention to other conditions such as age, work unit, etc. The specific requirements can refer to the enrollment policy of the region. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The technical requirements for the cultural relic display cabinet in the museum are as follows: ** 1. Materials ** 1. ** Safety and stability ** - The materials used for the showcase must be stable and safe for the cultural relics. Due to the direct or indirect contact between the display cabinet and the cultural relics, if the material contains sulfur, sulfur, or other acidic components, it will release harmful gases (such as sulfur dioxide, sulfur dioxide, nitrogen dioxide, oxygen dioxide, volatile organic acid, volatile aldo, etc.) after contact with the cultural relics or aging. Therefore, it was relatively safer to use stainless steel, aluminum alloy, and steel plates with plastic-coated surfaces. - Generally, materials that are potentially harmful to cultural relics include wood, paint, glue, leather, woolen fabrics, chemical fiber fabrics, and some textile dye. However, if it is determined through testing or chemical analysis that it will not cause damage to cultural relics, it can also be used to manufacture cultural relics display cabinets. For example, wooden display cabinets can also be used after meeting the relevant treatment requirements. Its processing technology includes wood drying, woodworking processing, and surface treatment. Wood drying must make the moisture content meet the requirements. Woodworking included saw-cutting, chiseling, planing, and other mechanical processing as well as technical work such as glue assembly. Surface treatment included painting, coloring, and surfacing. - The lining, lining, and decorative materials of the display cabinet should also be tested or analyzed to determine that they were harmless before they could be used in the cultural relic display cabinet. 2. ** Material Attributes ** - The hardness of the fire-resistant board is 4 - 7 times that of wood, 2 - 20 times that of ordinary glass, and 15 - 80 times that of plexiglass. It has the characteristics of wear resistance, heat resistance, impact resistance, etc. It can be cut according to the design requirements during construction. - Aluminium-plastic composite board was a popular new type of lightweight board. The surface was made of a polythene material, the middle layer was made of an aluminum layer or a PVP plastic base material, and the back was added with heat-resistant and sound-absorbing aluminum foam profile or rock wool and other thermal insulation materials. There were many commonly used thickness to choose from. - The main raw material of the plasterboard was building plaster. It had the characteristics of light weight, high strength, waterproof and damp-proof, and could be sawed and drilled. It was often used in the living room, bedroom, office, and other places. It was not suitable for the main structure of the cultural relic display cabinet, but it might be used as an auxiliary part. ** 2. Control of temperature and humidity ** 1. ** Sealing ** - The showcase should have good sealing properties because the cultural relics were sensitive to temperature and humidity. Good sealing properties could directly affect the temperature and humidity inside the showcase to a large extent, providing a relatively independent and stable storage space for the cultural relics. In order to ensure the tightness, the glass must be seamlessly connected to the display cabinet. It can also use raw materials such as sealing tape, sealants, and sealants. 2. ** humidity control equipment ** - The interior should be equipped with automatic temperature and humidity measuring instruments and humidity control equipment. There are two options for humidity control. One is to install a dryer. When the humidity exceeds the required range, the humidity controller can automatically turn on the dryer to reduce the humidity and display an alarm signal at the same time. The other is to place a moisture absorption buffer material (such as silica gel). There is enough space in the lower box of the showcase for the moisture absorption buffer material. The moisture absorption buffer material can absorb moisture in the humid climate in summer and release moisture in the dry climate in winter to maintain the humidity in the showcase. The staff needed to change the moisture absorption buffer material according to the climate characteristics. According to the experience of the Museum of Canada, about 20 kilograms of silica gel should be placed in each cubic meter of the showcase space (general situation). For a well-sealed showcase, 2.5 kilograms of silica gel should be placed in each cubic meter of the showcase space to meet the requirements. The lower layer of the showcase should have enough air holes for air exchange with the upper layer of the cultural relics. ** 3. In terms of structure ** 1. ** Overall structural stability and reliability ** - There were various forms of display cabinets, such as wall-through cabinets, wall-in-wall niche cabinets, etc., which had slightly better stability and reliability. Independent cabinets placed independently had higher requirements for stability and reliability. During the production, not only should the cabinet body follow the basic principle of triangular stability, but the internal stability structure should also be used. The connection between the metal cabinet body and the glass cabinet body should also maintain good stability and reliability. It is best to use anti-slip locks for independent cabinets to avoid damage caused by sliding movement. 2. ** Intelligent security system and electronic anti-theft system ** - Different anti-theft system solutions were made according to the characteristics of different cultural relics. When the showcase was opened or damaged in an abnormal situation, the alarm was triggered to play the corresponding effect. Combined with the video surveillance system, the intelligent security protection of the cultural relics showcase was realized. ** 4. Daylighting ** 1. ** Light source selection and adjustment ** - The light source was divided into two types: artificial light source and natural light source. The artificial light source could be adjusted according to the special requirements of the cultural relics on the brightness, angle, range, etc., to adjust the appropriate lighting effect. It was suitable for cultural relics with special requirements on temperature and humidity. ** 5. Esthetics ** 1. ** Combination of design and artistic aesthetics ** - During the exhibition of cultural relics, under the condition of ensuring the needs of the exhibition, the cultural and artistic influence of the exhibition should be exerted in all directions, and the artistic performance and artistic beauty of the products should be reasonably combined to maximize the overall exhibition effect. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The bio-ecological filter system could be used to purify rainwater pollution. The system was composed of an environmental engineering unit biofilter and an ecological engineering unit ecological filter. The biofilter could remove organic impurities, nitrogen, total suspended solid, etc. in the sewage. Its working principle is to use the filter material in the biofilter and the biological membrane formed on the filter material to treat the organic impurities in the small point source sewage with lower concentration, and at the same time remove the nitrogen and total suspended solid. The ecological filter can adopt multi-stage series connection, which improves the treatment effect of the ecological filter. The setting of the pre-settling tank can reduce the load of the ecological filter. The filtering of the ecological filter and the growth and absorption of plants can further purify the water of the biological filter. After the optimization of the ratio of the biological filter media for the treatment of rainwater pollution through the small test, it could effectively remove SS (suspended matter) and chemical oxygen demand (chemical oxygen demand) in the simulated rainwater, and the removal rate was stable at more than 70%. The SS removal rate remained stable during the rain scouring process, but the removal rate of the chemical oxygen demand would decrease by about 10% - 20% during the later rain scouring. Further experiments on the filter material showed that the removal of the chemical oxygen demand was not only related to the filtering effect, but also related to the absorption effect of the filter material. In addition, the biological filter method used activated sludge materials to simulate the ecological environment. After the rainwater passed through the filter and reached a certain quality, it could be put into the secondary water storage bucket for agriculture and domestic water. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Correct. The requirements for preparing accounting statements included reporting on time. In order to ensure the quality of the accounting statements, it was necessary to complete the preparation and submit them on time within the specified period under the premise of ensuring the quality. This was to meet the needs of the users of the accounting statements for information and to understand the situation of the unit in a timely manner. At the same time, when preparing the accounting statements, the requirements such as true figures, accurate calculation, and complete content should also be met. For example, the accounting statements must be prepared according to the registered and verified account book records and other accounting materials. All indicators and data must be calculated accurately, true and reliable. The external financial statements must be compiled in accordance with the prescribed format and filled in completely. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>