Latest sewage treatment plant internship report

This article directory 1 sewage treatment plant internship report 2 sewage treatment plant internship report 3 sewage treatment plant internship report

Internship Report of Shahu Sewage Treatment Plant I. Internship Results In this internship, we learned the knowledge that we could not learn from the textbooks. Through on-site visits, we also had some understanding of some processes and processes. We have a deeper experience in all aspects of wastewater treatment. II. Internship l Internship time: Tuesday, November 17, 2019 l Internship location: Shahu, Wuhan

Shahu Sewage Treatment Plant Internship Report

I. Internship results

During this internship, we learned the knowledge that we couldn't learn in the textbook. Through the on-site visit, we also had some understanding of some processes and processes. We have a deeper experience in all aspects of wastewater treatment. Student Report Network II. Internship

l Internship time: Tuesday, November 17, 2019 l Internship location: Wuhan Shahu Wastewater Treatment Plant 1. Overview of sewage treatment plant

A. Location: Wuhan Shahu Sewage Treatment Plant is located at No. 391, Zhongbei Road, Wuchang, covering an area of ​​125 mu, including about 63 mu in the first phase, about 25 mu in the second phase, about 37 mu in the third phase, and 16.9 square kilometers in the catchment area. The service scope is to the south of Shahu Lake, north of Wuyi Road, west of Donghu Lake and east of Dadongmen, serving a population of 250,000. Student report network

B. Project situation: The total design and processing scale of the plant is 150,000 m3/d, and the whole project is completed in three phases. The first phase of the project was designed by the China Southern Engineering Design Institute of China Municipal Engineering. The design and processing scale was 50,000 m3/d. It was officially put into operation in 1993 using the traditional activated sludge secondary treatment process. The second phase expansion project was designed by Wuhan Municipal Engineering Design and Research Institute. The design and processing scale is 50,000 m3/d. It was started in 2001 and completed in January 2003. The third phase of the project was jointly designed by the China Municipal Engineering Central South Design Institute and the Wuhan Municipal Engineering Design and Research Institute. The main project is to transform the first phase of the traditional activated sludge process into an inverted A2/O process; the second phase will be treated at 50,000 m3. The first-level treatment project was expanded and expanded to a daily processing of 100,000 m3 of A2/O secondary treatment system. The third phase of the project was completed at the end of 2005, bringing the total treatment scale of the plant to 150,000 m3/d. The total investment of the first, second and third phases of the plant is about 160 million yuan. C. Organizational Structure Wuhan Shahu Wastewater Treatment Plant is affiliated to Wuhan Sanzhen Industrial Holdings Co., Ltd. The second and third phases of the project belong to Wuhan Urban Drainage Development Co., Ltd., and the higher level supervisor is Wuhan Water Group Co., Ltd. The factory has 62 employees. Among them, there are 1 senior professional title, 6 intermediate professional titles, and 34 junior college graduates, accounting for 55% of the total number of employees. There are currently 4 departments in the factory, which are integrated office, production technology room, finance room and laboratory. 2. Process

The Shahu Sewage Treatment Plant adopts the traditional activated sludge process with the aeration of the impeller as the main body, all using domestic equipment. Sewage treatment uses various methods to separate the pollutants in the sewage or convert them into harmless substances, so that the sewage can be purified. Classification of sewage treatment methods: .A2 O

. Invert A2 O

The activated sludge process is the most widely used aerobic biochemical treatment technology for wastewater. It is mainly composed of aeration tank, secondary sedimentation tank, aeration system and sludge return system.

After the initial sedimentation tank, the wastewater enters the aeration tank simultaneously with the activated sludge refluxed at the bottom of the secondary sediment. By aeration, the activated sludge is suspended and fully contacted with the wastewater. The suspended solids and colloidal substances in the wastewater are adsorbed by the activated sludge, and the soluble organic matter in the waste water is used as a self-propagating nutrient by the microorganisms in the activated sludge, and is metabolized into substance cells and oxidized to become a final product. Undissolved organic matter needs to be converted into dissolved organic matter before it can be metabolized and utilized. The wastewater is thus purified. After purification, the wastewater and activated sludge are separated in the secondary sedimentation tank, and the upper layer of water is discharged. A part of the separated and concentrated sludge is returned to the aeration tank to ensure that a certain concentration of activated sludge is maintained in the aeration tank, and the rest is residual sewage. Mud, discharged by the system.

2 The influencing factors of activated sludge reaction are as follows:

BOD load rate, also known as organic load rate. Water temperature. PH value. Dissolved oxygen. Nutritional balance. Toxic substances 2 Aeration device:

n blast aerator

Microbubble aerator in bubble aerator hydraulic shear type air aerator hydraulic impact air aerator n mechanical aerator

Vertical shaft mechanical aerator horizontal shaft mechanical aerator n main operation mode of activated sludge method

Push-flow activated sludge method, fully mixed activated sludge method, aerated activated sludge process, adsorption-regeneration, activated sludge, delayed aeration, activated sludge, high-load activated sludge, shallow aeration, deep water aeration, Deep well aeration activated sludge process pure oxygen aeration activated sludge process oxidation ditch process sequencing batch activated sludge process

The treatment of industrial wastewater by traditional aerobic activated sludge process is a method of economical and good purification effect. The disadvantage is that the concentration of pollutants in the wastewater will change, especially some inhibitory pollutants have obvious bacterial activity. Inhibition. On the basis of the traditional method, the aerobic activated sludge is domesticated, and the domesticated activated sludge can resist the inhibition of high-concentration pollutants. For example, the domesticated mixed bacteria can continuously degrade the toxic organic chloride, effectively improving the purification. effect. In addition, the sludge produced by the conventional activated sludge process is relatively large, which is a relatively large disadvantage of the conventional activated sludge process. 3. Process

The process flow of the plant is shown in Figure 1-1:

Grit chamber - anaerobic pool - anoxic tank - aeration tank - second sinking tank u first phase project - inverted A2O

Advection grit chamber: 50° angle funnel; divided into two compartments, each 9 meters long and 1.6 meters wide; removes relatively large inorganic particles in sewage

: In addition to P, N, there are activated sludge and propeller underneath, using impeller reversal: surface aeration, in addition to organic matter

: The effluent reaches the standard of dissolved oxygen 200mg/L

:The impeller rotates slowly for 40min-92min, separating water from activated sludge to prevent water deficiency

: The radial flow grit chamber with a diameter of 30 meters, 4 meters high, the activated sludge after the aeration treatment of the sand lake expansion is used in this part of the activated sludge after this aeration treatment, part of which is discarded Being utilized

The copyright belongs to the original author, and the student report network is published.

ü Shahu expansion - A2O: remove small particles of impurities

: Aeration, remove the bulk of the impurities copyright belongs to the original author, the student report network finishing release

: deflated underwater

Third, the internship summary

The internship at the Shahu Wastewater Treatment Plant allowed me to learn more about the process of the activated sludge process during the student phase. The activated sludge process is currently aerobic biochemical treatment technology commonly used in the treatment of urban and industrial wastewater. The process is relatively simple, the treatment cost is low, and the treatment effect is good.

Part 2: Sewage Treatment Plant Internship Report

Internship purpose

Through this visit to the water plant and the power plant, we need to initially contact the practical application of professional knowledge, and establish the overall outline of professional knowledge, so that we can contact the reality when learning professional courses, understand more deeply, and learn more solidly. Improve your interest in learning, feel the power of the team in practice, and feel the charm of knowledge.

Internship Content

This internship visited the Huyan Water Plant in Taiyuan on Tuesday and visited the Guodian Taiyuan No. 1 Thermal Power Plant on Thursday.

1. Taiyuan Huyan Water Plant is located in the southwest side of Huyan Village on the west bank of the Weihe River in the northern suburb of Taiyuan City. It is the first large-scale surface water treatment plant in Taiyuan City and one of the few large-scale surface water treatment plants in the country. The plant uses the Yellow River water of the Weihe Reservoir as the water source, and can transfer gravity from the Weihe Reservoir to the water purification plant. It uses mechanical mixing, vertical flow chamber flocculation, inclined plate sedimentation, table flushing and chloramine disinfection. The process flow and recovery and treatment of the mud drain water in the filter backwashing wastewater sedimentation tank.

The water source of the water plant is the Yellow River water, which is transported long distance to the Weihe Reservoir, and then taken to the Huyan Water Plant by the tunnel and pipeline gravity. The turbidity of the raw water quality index is less than 30 NTU at normal, less than 300 NTU at flood time, and the maximum is less than 1 000 NTU; and meets the Class III water quality standard in the Surface Water Environmental Quality Standard. The water quality of the factory water should meet the requirements of the first type of water division in the “Technology Progress Development Plan for Urban Water Supply Industry 2000”, and the factory water turbidity is not more than 1 NTU. 60% of the water pressure engineering service area is not less than 0.28 MPa. The water consumption of the water plant is 6% of the design scale.

According to the process flow from west to east, from high to low, the whole water plant is divided into four different elevation platforms: auxiliary workshop area, water purification workshop area, clear water pool area and factory front area. The field is in the collapsible loess area, and is also close to the fault zone. Therefore, some special treatment measures for the collapsible loess area have been adopted in the design of the water plant.

The main equipment we visited was:

Raw water inlet pipe

The raw water enters the plant area through a diameter DN 3000 mm main pipe from the outside of the factory. It is divided into two by the three links, one DN 3000 is connected to the long-term, and one DN 2600 enters the nearest factory pipe gallery, and then divided into two. The DN 1800 steel pipe enters the distribution well. The inlet flow rate and pressure are controlled, and a DN 1800 electric regulating butterfly valve is set on each of the two inlet pipes, and the valve opening degree is controlled by the water level signal of the distribution well. The pipeline is also equipped with two DN 1800 electromagnetic flowmeters to measure the incoming raw water.

2. Distribution well

The water distribution well is designed according to the recent scale of 800,000 m3/d. There are 1 set, 2 separate grids and 2 min stay time. The free-flow weir is equipped with water. In order to make the water distribution uniform, the water distribution well is provided with a steady flow area; the bottom mud is separated by a small bucket and a bottom valve. In order to remove the floating objects in the water, there are 4 folding plate rotating screens with a width of B=2.0 m and a hole size of 4 mm × 4 mm.

3. Mixing pool

Each group of the mixing pool is designed according to the scale of 200,000 m3/d. There are two groups in each water purification workshop with a residence time of 2 min. The machine is equipped with a vertical shaft mechanical mixing and a set of 2 mixers. 4. Flocculation pool

The flocculation tank adopts vertical flow chamber flocculation, and each group is designed according to the scale of 100,000 m3/d. There are 8 groups in total, and two water purification workshops are set up, and the residence time is T=40 min. The flocculation cell is scaled up step by step; the inlet end flow rate is 0.5-0.7 m/s, the outlet end flow rate is 0.10-0.15 m/s; G=30-60 s-1, GT=104-105.

Seasonal changes, the difference of raw water quality is large, in order to make the flocculation tank adapt to the change of raw water quality, the special gate control over the canal, so that the water flow tank can run in three kinds of residence time of 20 min, 30 min, 40 min. In order to prevent mud accumulation, a perforated mud discharge pipe is arranged at the bottom of the flocculation tank, and a new type of mud discharge angle valve is set at the end of the pipe. All the mud discharge valves are divided into two groups, which are respectively lined up to discharge mud, and the mud discharge cycle can be flexibly set according to the change of raw water quality. 5. Sedimentation tank

The sedimentation tank is a lateral flow sloping plate sedimentation tank. Each group is designed according to the scale of 100,000 m3/d. There are 8 groups in total, and 2 sets of water purification workshops are set up. The residence time of the sedimentation tank is 60 min, the horizontal flow rate is 16 mm/s, the length of the sloping plate is 1.2 m, the inclination of the inclined plate is 60°, and the spacing between the plates is 100 mm.

Each set of sedimentation tanks is divided into a water zone, a steady flow zone, a sedimentation zone and a water discharge zone. Each pool has the same width and different lengths. The water distribution area is equipped with a water distribution wall to divide the water flow along the width; 2 sets of scraper in the steady flow area; suspended sloping plate on the upper part of the sloping plate sedimentation area; 4 sets of 15 m diameter scraper on the lower part; The root water collecting trough and one total trough, the water flows through the water outlet wall into the water collecting trough, and then into the total trough. The scraper used is a central transmission type, and the mud discharging method is gravity forced discharging.

6. Filter

The filter tank is a table-washing siphon filter. Each group is designed according to the scale of 200,000 m3/d. There are 4 groups in total, and each group has 2 sets of water purification workshops. Each group of filter tanks is divided into 8 grids, and the area of ​​single grid filter tanks is 148.8 m2. The grids of 8 grids are arranged in double rows, with collecting channels and outlet channels in the middle, and drainage systems on both sides.

The filter design has a filtration rate of 7.5 m/h and a maximum filtration head of 2.0 m.

The inlet water uses a siphon and a weir, and the recoil drainage uses a siphon, a drainage branch and a drainage total.

The filter material adopts double-layer filter material: quartz sand filter material, effective particle size is 0.6 mm, thickness is 600 mm; anthracite filter material, effective particle size is 1.2 mm, thickness is 200 mm. The support layer has a particle size of 2 to 20 mm and a thickness of 200 mm.

The filter backflushing system uses double-layer filter bricks with a recoil intensity of 12-15 L/ and a recoil time of 7 min.

There is a fixed surface rinsing system in each filter tank, and water is sprayed by nozzles. The service area of ​​each nozzle is 0.32~0.36 m2. The table flushing is supplied by a special water pump. The table flushing intensity is 2.5-3.0 L/, and the table punching time is 4 min.

2. Guodian Taiyuan No. 1 Thermal Power Plant was founded in 1953 and is one of the 156 key projects of the country during the “1. 5” period.

In the past 50 years, after six phases of expansion, it has gradually developed into a modern large-scale cogeneration enterprise with an installed capacity of 1.27 million kilowatts. By the end of 2003, the country generated 102.053 billion kWh of electricity and supplied 263 million kilojoules of heat, which was responsible for the centralized heating and heating of some 800,000 square meters in Taiyuan City and some industrial heat loads. The province's economic development has made outstanding contributions. It consists of the following five systems:

1 Fuel system: A system that completes fuel delivery, storage, and preparation. Coal-fired power plants have equipment such as coal unloading facilities, coal yards, coal handling facilities, coal bunkers, coal feeders, coal mills, etc.; fuel oil power plants are equipped with oil tanks, heaters, oil pumps, oil pipelines and other equipment.

2 Combustion system: A system that completes the fuel combustion process and converts fuel chemical energy into steam heat energy. There are mainly burners, furnaces, blowers, induced draft fans, dust collectors, ash removal equipment, etc.

3Soda system: A system that converts steam heat into mechanical energy. There are mainly steam water parts of boilers, steam turbines and their auxiliary equipment, such as condensers, deaerators, return water heaters, feed water pumps, circulating water pumps, cooling equipment, etc.

4 Electrical system: A system that converts mechanical energy into electrical energy. There are mainly generators, main transformers, circuit breakers, disconnectors, busbars, etc. 5 control system: the system to complete the parameter measurement and automatic monitoring operation in the production process. Among all the equipment in the above systems, the most important equipment is boilers, steam turbines and generators, which are installed in the main building of the power plant. The main transformer and power distribution equipment are generally installed in separate buildings and outdoors; other auxiliary equipment such as water supply systems, water supply equipment, water treatment equipment, dust removal equipment, fuel storage and transportation equipment, etc., are installed in the main building.

The process for producing electricity from a coal-fired power plant is as follows:

The basic production process of thermal power generation is that the fuel is burned in the boiler, and the heat is released and transferred to the water in the boiler to generate high-temperature and high-pressure steam; the steam passes through the steam turbine and converts the thermal energy into rotational power to drive the generator output. Electrical energy.

A large-scale coal-fired thermal power plant like Taiyuan No. 1 Thermal Power Plant generally uses a pulverized coal fired boiler. The production process is: crushing the raw coal entering the plant by crusher, grinding the coal mill into pulverized coal, blowing it with hot air, spraying In the boiler furnace, the high-temperature flue gas generated by the combustion of pulverized coal firstly heats the water wall tube and the superheater tube in the furnace, and then enters the dust remover through the reheater, the economizer and the air preheater in the flue. After removing the fly ash from the flue gas, it is discharged into the atmosphere through the chimney.

The water generates saturated steam in the boiler furnace. When passing through the superheater, it is heated by the flue gas to become superheated steam. It is sent to the steam turbine through the main steam pipe, and after expanding in the steam turbine, it enters the condenser and condenses into water. The condensed water enters the deaerator through the low-pressure regenerative heater, and is sent to the boiler through the feed water pump and the high-pressure heater. A portion of the steam is withdrawn from an intermediate stage of the turbine and sent to a regenerative heater and a deaerator for regenerative feed water and heated deaeration. In order to compensate for the loss of steam and water, the chemically treated make-up water must also be added to the deaerator, and the water from the deaerator can be supplied to the boiler. In order to condense the steam into water in the condenser, it is necessary to continuously use the circulating water pump to send the cooling water into the condenser pipe in the condenser for heat exchange, which in turn forms a cooling water system. Cooling water or directly from rivers, rivers, lakes and discharged into rivers, rivers, lakes, or in the cooling tower spray pool to exchange heat with the atmosphere for reuse.

After the superheated steam enters the steam turbine, it pushes the rotor to rotate, drives the generator to rotate and generate electricity, and then sends it to the user through a series of electrical equipment and transmission lines. This is the production process of a general large and medium-sized condensing coal-fired thermal power plant. Some are installed in an auxiliary building or in an open space.

Internship experience

After two days of internship, although it is a bit hard, it is worth the hard work. Only through practice can we gain a deeper grasp of knowledge and apply what we have learned in our future studies and work. Understand and master the practical knowledge and relevant standards related to the technical parameters of the relevant products of this professional, and enhance the specific knowledge of the composition and structure of boilers, steam turbine systems and auxiliary equipment, and lay down the professional curriculum, professional curriculum design and graduation design for the future. Good foundation. Finally, I sincerely thank the three teachers for their hard work!

Part 3: Intervention Report of Sewage Treatment Plant (3)

I. Internship time and place

July 6, 2019, Tangshan Beijiao Wastewater Treatment Plant

Second, the purpose of internship

1. Understand the water resources of the city, the water source of the water plant, and the water quality requirements. 2. Understand the scale, process flow, layout and vertical layout of the water plant.

3. Understand the variety, dosage and mode of use of water purification chemicals in water plants; disinfection methods, dosage and equipment.

4. Familiar with and understand the type, structure, working process, basic design parameters and operation management content, methods and experience of each individual structure.

5. Expand the scope of students' professional knowledge, deepen and consolidate the theoretical knowledge they have learned. 3. Internship content 1. Introduction to wastewater treatment plant

The Beijiao Sewage Treatment Plant was built in 2001 and was built by Tangshan City using ADB loans. Its daily sewage treatment capacity can reach 150,000 tons. The plant uses the peripheral pumping station to enhance the form of water delivery, collecting and processing industrial wastewater and domestic sewage in Tangshan High-tech Industrial Development Zone. Among them, industrial wastewater accounts for 70%, domestic sewage accounts for 30%, and the treated water quality can reach the national first-class B standard. Since the establishment of the factory, the factory has adhered to the implementation of total quality management, taking human management as the key to quality management, production operation management as the core of quality management, equipment management as the basis of quality management, paying attention to every link and ensuring sewage treatment. The effluent water quality meets the design requirements and is superior to the emission standards required by the design regulations. Pay attention to and strengthen technological transformation, and achieved good economic and social benefits in terms of energy conservation and consumption reduction.

2. Basic flow chart of sewage treatment in the northern suburb sewage treatment plant: 1) Overall flow chart of the sewage plant: blower room

Inlet → coarse grid → lift pump station → fine grid → grit chamber → anaerobic pool → oxidation ditch → second sinking pool → water ↑ ↓

Outbound landfill ← dewatering machine room ← return pump room

2) Sludge treatment process:

Residual sludge → sludge pump → concentrated dewatering machine → belt conveyor ↑ integrated dosing device → dosing pump

3. Visit the sewage plant

We first visited the general control room and probably understood the whole process of sewage treatment. Then began a tour in the production order around the entire plant. During the period, the interpreter carefully explained the process from the first process of sewage entering the treatment plant to the draining process of dust reduction, mud removal and oxidative disinfection into the national first-class B standard. There is also a final water reuse treatment. The water treated by bio-oxidation and fiber filter can be directly used for road sprinkling, industrial water, landscape water, fish pond water, landscaping and mixed efflux for upgrading. Increased water utilization and saved resources.

Fourth, internship experience

The one-hour internship was soon over. I cherish this internship because I not only learned some knowledge that I didn't have in my textbooks, I also knew some machines that I couldn't reach in class, but also made me theoretical and practical. Combined, they have deepened their impression of the knowledge they have learned and broadened their thinking.

When we visited the internship, my knowledge was consolidated and improved. In this internship, I not only understand the application of environmental engineering in industrial production, but also understand that safety protection measures should be taken at the production site, and more importantly, the application of some parts of the book in production is linked. Get up, do a combination of theoretical practice, and have a further understanding of the actual production, although there are not many things that can be linked now, but also benefit a lot.