Introduction: Through the apprenticeship, to understand and personal contact with some of the machines and equipment in the sewage treatment, and a preliminary understanding of its function and working principle in the actual production. The following is the construction log of wastewater treatment plant that I have organized for you, welcome to read and learn from it!
Construction log of sewage treatment plant (1)In order to make sewage after certain methods of treatment, to meet certain standards set, discharged into a body of water, discharged into a body of water or reuse, etc., to take certain measures or methods, etc..
Modern sewage treatment technology, according to the degree of treatment, can be divided into primary, secondary and tertiary treatment.
Secondary treatment, the main removal of sewage in the colloidal and dissolved organic pollutants (BOD, COD substances), the removal rate of up to 90% or more, so that organic pollutants to meet the discharge standards.
Tertiary treatment, further processing of difficult to degrade organic matter, nitrogen and phosphorus can lead to eutrophication of the water body, such as soluble inorganic substances. The main methods are biological denitrification and phosphorus removal method, coagulation and precipitation method, sand rate method, activated carbon adsorption method, ion exchange method and electro-osmosis analysis method.
The whole process is through the coarse grid deletion of raw sewage through the sewage lifting pump after lifting, through the grid deletion or sieve rate, and then into the sand sedimentation tank, after the sand-water separation of sewage into the initial sedimentation tank, the above for the first level of treatment (i.e., physical treatment), the primary sedimentation tank of the effluent into the biological treatment equipment, there are activated sludge and biofilm method, (which activated sludge method of the reactor aeration tank, oxidation ditch, etc.), biofilm method includes biofilter, and biofilm method includes biological filter tank, and so on. (The reactors of activated sludge method are aeration tank, oxidation ditch, etc.), biofilm method includes biofilter, bio-turntable, bio-contact oxidation and bio-fluidized bed), the effluent of the biological treatment equipment enters into the secondary sedimentation tank, and the effluent of the secondary sedimentation tank is disinfected and discharged or enters into the tertiary treatment, which is the end of the primary treatment to the secondary treatment, and the tertiary treatment includes the biological denitrification and removal of phosphorus, coagulation and sedimentation, sand filtration, activated carbon adsorption, ion exchange and electro-dialysis method. Part of the sludge from the secondary sedimentation tank is returned to the initial sedimentation tank or biological treatment equipment, part of the sludge into the sludge thickening tank, and then into the sludge digestion tank, after dewatering and drying equipment, the sludge is finally utilized.
Sewage treatment plant construction log (2)This time in Huizhou seventh sewage treatment plant for ten days of study, let me learn a lot, not only because of ten days of time, but also because it is our study of sewage treatment plant is from the process, experiments, the control of the comprehensive and detailed understanding of the sewage treatment plant, so that we from the sewage treatment plant hardware and software equipment have a certain degree of understanding. First of all, understand a sewage treatment plant, is the first from its treatment process to start understanding. Huizhou seventh sewage treatment plant is used in the SBR process (commonly known as sequencing batch activated sludge method), the specific process is as follows: influent → lifting pump room → coarse and fine grating → cyclone sand sedimentation tank → SBR pool → ultraviolet disinfection pool → water, and the entire process of sludge produced in the sludge pool to deal with sludge dewatering and transportation.
In the water intake link, the device has a detection instrument, detection of COD, BOD and other heavy metal content in the water intake, these data can be timely response to the central control room for timely monitoring, for water quality indicators and metal content exceeding the standard can make timely response. The lifting pump room is to lift the water level to the long-term water level, and then through the coarse and fine grating will be the water larger . Floating matter removal, after that in the cyclone sand sedimentation tank, through the cyclone movement to make the sewage produce centrifugal force, the sewage in the suspended fine sand removal, in order to ensure that the later process.
SBR tanks, is the key to the treatment process of the seventh sewage treatment plant. There are six of these sewage tanks, each of which has five processes in a treatment cycle, inlet, reaction, sedimentation, discharge, standby five processes. First, the water intake to accept sewage, until the water level reaches the required level, aeration, this time is the reaction period of the sewage, this period can be based on the data of the water quality of the water intake mentioned earlier to determine the aeration time, intensity and the amount of sludge reflux to achieve the effluent requirements of the COD and total nitrogen and total phosphorus content. Solid-liquid separation of the mixture is carried out after the reaction, which can ensure a good mud-water separation effect, and this period is the key to control the SS of the effluent. After the sedimentation is completed, the reactor excludes the clarified water and also discharges the remaining sludge from the reaction tank. After the drainage period, the reactor pool enters the standby state and waits for the next cycle of reaction, in which slight aeration should be carried out to avoid sludge decay. This is how these six pools alternate to complete each stage of sewage treatment.
The effluent after the SBR tank will enter the disinfection tank, the last process before the sewage factory, to kill the toxic microorganisms in the water, to ensure the quality of the effluent water.
Laboratory is also an important part of the water plant, its main task is every two hours on the plant's water intake and reaction pool of the water out of the water, unified collection in the laboratory, and then in the morning of the next day for the determination of COD, total nitrogen and total phosphorus content, the specific experimental steps can be referred to the State Ministry of Environmental Protection chemical testing methods document. Laboratory test out of the data to be the first time to the control room or the plant manager, and then based on these data to decide whether to adjust the treatment process. The central control room, is to monitor and timely record of the plant's various data on sewage, the process of adjustment, but also must always observe the operation of the plant equipment, the emergence of problems in a timely manner to reflect and deal with.