The following is a sewage treatment plant internship experience I brought, welcome to read reference.
Sewage treatment plant internship experience (a)
First, the purpose of the internship:
1, to understand the sewage plant's conventional treatment process, the structures of these buildings have a general concept.
2, to understand the basic composition of the water treatment works, layout and operation, for the study of professional theoretical knowledge, lay a good foundation.
Second, the nature of the internship: visit internship
Third, visit time: September 29, 20xx
Fourth, visit location: xxx sewage treatment plant
Fifth, explaining the staff: sewage plant staff
Sixth, the content of the visit
1, General:
Standard Water Bazhou Jiacheng Water Quality Purification Co. Ltd. (i.e. Shengfang second sewage treatment plant) is located in Bazhou City, Shengfang Town, Fangjin Road, No. 688, north of the Zhongting River embankment, covers an area of 33,500 square meters, service area of 18, 4 square kilometers, serving a population of 150,000 people. The source of wastewater is mainly the mixed wastewater of pickling wastewater from metal processing enterprises in the industrial park and domestic sewage from town residents. Sewage treatment plant internship report. Investment of 49.27 million yuan, covers an area of 2, 06 hectares, 20,000 tons of sewage treatment daily.
2, sewage treatment process program:
For the high concentration of fe ions in the sewage, ph value is low, the treatment of difficult characteristics, the project innovative application of "oxidation and neutralization + primary sedimentation tank" to strengthen the pretreatment process, to remove fe ions in the sewage, and then to take the independent research and development of a high degree of automation, stable results, strong anti-shock load. The project innovatively applies the "oxidation neutralization + primary sedimentation tank" enhanced pretreatment process to remove the fe ions in the sewage, and then adopts the independently developed csbr process with high degree of automation, stable treatment effect, and strong shock load resistance. The overall process is safe, efficient and stable. The effluent water quality fully meets the national requirements.
Generally, it is the traditional activated sludge process, which separates the pollutants in the sewage or transforms them into harmless substances, so that the sewage can be purified. Classification of sewage treatment methods:
(1), physical treatment method. Such as filtration method, precipitation method. Sewage treatment plant internship report.
(2), physical-chemical method. Such as coagulation precipitation method.
(3), biological treatment method. The use of microorganisms to adsorb, decompose, oxidize the organic matter in the sewage, and degrade the unstable organic matter into stable and harmless substances, so that the sewage can be purified. Activated sludge method is a biological treatment method.
Seven, process design
7, 1 process flow diagram
7, 2 units of functional description
7, 2, 1 grating tank
The suspended matters in the domestic sewage discharged from the plant are characterized by many, miscellaneous, such as socks, hair, etc.. Set up a grating tank to isolate this part of the suspended solids, otherwise it is easy to clog the pump, affecting the normal operation of the treatment system.
7, 2, 2 sand sedimentation tank
The use of advection aeration sand sedimentation tank to remove the water density of inorganic particles, this method not only protects the machine parts and piping from loss, but also reduces the load of sbr pool.
The advantages of the aeration sand sedimentation tank are as follows: better than ordinary sand sedimentation tank treatment, can remove ordinary sand sedimentation tank can not be removed by the organic matter covered sand; due to the role of aeration, organic particles in the wastewater is often in a state of suspension, the sand particles are friction each other and withstand aeration of the shear force, the sand particles of organic pollutants can be removed from the attached, is conducive to obtaining a more pure sand particles. Sand discharged from the aeration sink, organic matter accounts for only 5% or so, generally long-term shelving is not corrupt.
7, 2, 3 pool
The pool is used to equalize the water quality. There are two submersible pumps with self-propelled devices in the catch basin.
2, 2, 4 sbr reaction pool
The water in the catchment basin is quantitatively pumped by submersible sewage pumps to the sbr reaction pool for degradation of organic matter before being discharged into the disinfection pool for further treatment. sbr reaction pool is equipped with submersible aeration, mixer, which is characterized by separate aeration and mixing, the source of the gas is a blower, which can meet the requirements of the sbr reaction pool for the aeration and mixing of the water in reaction and standby, and the mixing of water in the intake. Standby, into the water when the mixing requirements. Because the sbr reaction pool anaerobic, anoxic and aerobic state alternately, so in the removal of organic matter at the same time, can achieve the purpose of phosphorus denitrogenation.
sbr reactor design parameters are as follows: sbr reactor 2, alternating operation; operation cycle 6 times / d; reaction 2h; precipitation 1h; drainage 1h; sludge load: 0, 07kg per kgmlss-d bod5. sbr (sequencingbatchreactor abbreviation) that is, the sequence of batch activated sludge method, is a kind of intermittent aeration by way of aeration to remove organic matter, and at the same time can achieve the purpose of phosphorus and nitrogen removal. It is a kind of improved activated sludge method that operates according to intermittent aeration, and its main feature is the order and intermittent operation. sbr reaction tank integrates the functions of homogenization, primary sedimentation, biodegradation, precipitation, etc., and its operation mode consists of five basic processes, such as water intake, reaction, sedimentation, effluent, and standby, etc. From the beginning of the sewage inflow to the end of the standby time is counted as a cycle. The following is a brief introduction.
The inlet process is the process of accepting sewage in the reaction tank. Before the start of effluent inflow Figure 2sbr reactor work process schematic is the previous cycle of drainage or standby state, so the reactor tank remains a high concentration of activated sludge mixture. This corresponds to the action of sludge reflux in the conventional activated sludge method, when the water level in the reactor is at its lowest. The drainage system of the reactor tank remains closed for the time determined by the influent process or until the maximum water level is reached. The influent process is agitated for the purpose of denitrification.
The reaction process is when the wastewater is injected into a predetermined volume, aeration is carried out to achieve the purpose of removing bod, nitrification, phosphorus removal. Sedimentation process corresponding to the traditional activated sludge method in the secondary sedimentation tank. Aeration and mixing are stopped, and the activated sludge particles are subjected to gravity settling and supernatant separation. While the secondary sedimentation tank of conventional activated sludge is a sedimentation separation of various flows, the sedimentation process of sbr is static sedimentation and thus has a higher sedimentation efficiency. The sedimentation effluent is drained at the same time to prevent re-release of precipitated phosphorus under anaerobic conditions. Standby processThe period between settling and the start of the next cycle is called the standby process. Mixing in the standby process not only saves energy, but also helps to keep the sludge active.
7,2,5 Disinfection tank
The function of the disinfection tank is to kill the microorganisms and bacteria in the effluent of the sbr reaction tank. Disinfection tank using folded-flow reaction tank, contact time of 30min. disinfectant using bleaching water. Disinfection pool water is directly discharged or reuse.
7, 2, 6 sludge drying tank
Sedimentation tank slag and sbr reaction tank residual sludge by the sludge pump into the sludge drying tank for natural drying, and then regularly cleaned. The filtrate is returned to the grating tank.
7, 3 process characteristics
(1) The water intake and water quality changes have a good buffer.
(2) does not produce sludge expansion, the sludge index does not exceed 50-70mg/l.
(3) does not require continuous aeration, and does not require sludge, mixing liquid reflux system, low operating costs.
(4) Removal of organic matter can be achieved at the same time the purpose of phosphorus dephosphorization and denitrogenation.
(5) High degree of automation of the sewage treatment station, the system works according to the set working parameters, easy to manage, and good treatment results.
Eight, internship experience
1, through the graduation internship, can make us the classroom learned theoretical knowledge and actual production link, deepen the mastery and understanding of professional knowledge, make full use of the internship base of the strong conditions of the cultivation of our ability to analyze the engineering examples, and strengthen the discovery of the problem, analyze the problem, solve the problem of the comprehensive ability.
2, this internship is xxx wastewater treatment plant of the whole set of process operation and the installation of equipment structures and other issues for a comprehensive and detailed grasp and understanding. This not only allows me to study the specialty has a new understanding, but also for the next graduation design to lay a certain foundation. In the current society where the pursuit of profit is the biggest goal, the environment is becoming increasingly deteriorated, and the environmental protection program is opened precisely to cultivate engineers and technicians with a strong sense of environmental protection and a high level of competence. For the whole sewage treatment plant, its design, operation of the cohesion of a wide range of disciplines and the wisdom of many engineering designers, I am very infected and at the same time very inspired. As a future environmental worker, I y realize how difficult the task I have to carry.
Sewage treatment plant internship experience (two)First, the project overview
xxx** sewage treatment plant is located in the southern end of the town of ** Zhang Peng Village, next to the broken water gate, the total design scale of 90,000m3 / d, divided into three phases of construction. A project processing scale of 30,000m3 / d.
Second, the design scale and composition of the project
Total construction area of 1979.1 square meters, including three floors of the building, construction area of 1128.5 square meters. The first floor of the distribution room, with a floor area of 243.8 square meters, the first floor of the blower room, with a floor area of 132.2 square meters, the first floor of the sludge dewatering machine room, with a floor area of 427 square meters, and the two gatekeepers, with a floor area of 23.8 square meters.
Third, building design
1. Site overview:
**The town terrain is high in the northeast and low in the southwest, the proposed sewage treatment plant site is located in the southern end of the town of Zhangping Village, next to the broken flow of water gates, which is conducive to the sewage collection pipeline network layout. The plant site is close to the lion's ocean, favorable treatment of water discharge; plant site site is open, away from residential and industrial areas, no demolition and relocation works, the environmental impact on the township is small. Planning red line area of about 82.764 acres.
2. General layout:
(regional analysis of the map) sewage plant layout is mainly based on the city's dominant wind direction, the direction of water intake, the location of discharged water bodies, process characteristics and site topography, geological conditions and other factors to be arranged, both to consider the process is reasonable, easy to manage, economical and practical, but also consider the building shape, plant greening and coordination with the surrounding factors, and to facilitate the construction, maintenance and management. The company's management and maintenance are also important to the company's success.
According to the different functional zoning of the entire plant is divided into: production management and living area (pre-factory area), sewage treatment area and sludge treatment area (production area).
(Wind direction analysis diagram) The preplant area is arranged in the upwind direction of the dominant wind direction in the city in summer, so as to minimize the impact of the odorous gas produced in the process of sewage treatment on the environment. A small park is set up to ensure a beautiful green environment in the area in front of the plant.
Pre-plant area is arranged with a comprehensive building, parking lot, etc., the comprehensive building and the treatment structures, blower room, feed pump room, sludge dewatering machine room and phosphorus dosing room to maintain a certain distance, and there are green belts separated from the sanitary conditions and working conditions are good.
(Flow analysis diagram) in the production area, according to the direction of the sewage trunk pipe into the plant and the direction of discharge of treated tail water according to the process flow from southeast to northwest of the arrangement of coarse grating drains and intake pump house, measuring well
1, fine grating drains, cyclone sedimentation tank, sbr pool, uv disinfection drains and metering well
2, such as sewage treatment structures, the second and third phase of the sbr pool, the blower room, sludge dewatering machine room and phosphorus dosing room are kept at a certain distance, and there are green belts and good working conditions. Pool, blower room, sludge dewatering machine room and phosphorus dosing room on the west side of the plant, on the east side of the first phase of the building zoning clear layout is reasonable. Make the process flow smooth, through, connecting the processing structures between the pipeline is convenient, straight, to avoid meandering and zigzagging.
Distribution center is close to the largest electrical load of the feed pump room and blower room. The largest structure in the sewage treatment ----sbr pool, arranged in the center of the whole plant, the blower room, sludge dewatering machine room and phosphorus dosing room is located on both sides of the sbr pool, saving the cost of piping and power, and easy to operate and manage.
The central control room, as the control center of the whole plant and the core of the production area, is located in the complex building, which is convenient for centralized management.
The plant is equipped with one gate and one side gate, which are used as the channels for people and logistics. The slag and dewatered mud cake are transported out by the side gate to ensure the environment in the front area of the plant.
Overall, the whole plant is compactly arranged, with obvious functions, occupying less land, and the near, middle and far three phases of the project have relative independence and integrity, and are well connected.
3, plane design in this project, the main body of the ancillary buildings for the complex, by the machine shop, warehouse, administrative rooms, laboratory, conference, reception, showroom, staff quarters, etc. caused by the main three-story. Machine shop, warehouse, staff quarters in a layer, and for its back in the complex building were set up a separate entrance and exit, so that clean and dirty water diversion, the second floor is mainly for the laboratory office and administrative offices, the third floor is mainly for the single staff dormitory and the center of the control room, recreation and activity room.
4, fa?ade design comprehensive building fa?ade modeling elegant and delicate, fresh, with a sense of the times, the building fa?ade of the concave and convex changes, conducive to the penetration of indoor and outdoor space, mingling, not only to improve the lighting conditions of the closed aisle, but also to make the beautiful outdoor scenery naturally integrated into the indoor space, reflecting the characteristics of modern architecture.
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