china is a vast country with a huge climate span between different regions. most sewage treatment facilities in china, especially in the north, are facing the test of low temperature in winter. in winter, the operation and management of sewage treatment stations should pay attention to the following matters:
1. winter operation management of buildings
(1) inlet
in winter, the decrease of water volume and low temperature at night easily lead to the ice at the intake, which makes the sewage collection impossible. in order to solve this problem, the patrol personnel must make daily patrols and find that the ice breaks up in time until the sewage can be collected smoothly.
(2) lifting pumping station
in winter, indoor humidity is high, humidity is high, night temperature is too low, windows are closed, which causes indoor air deterioration and water storage is easy to freeze. in order to solve this problem, the line inspectors must properly open the doors and windows to ventilate, open the coarse grille on time, switch the lifting pump on time, prevent the storage tank from freezing, and find that the ice breaks in time.
(3) fine grille
in winter, indoor humidity is high, humidity is high, night temperature is too low, windows are closed, which causes indoor air deterioration and water storage is easy to freeze. to solve this problem, operators must properly open doors and windows or ventilation fans to ensure that fine grids, screw conveyors, cyclone sand sinks, blowers, sand water separators open 24 hours. if an overflow occurs, the accumulated water must be cleaned up in time to prevent the water from freezing.
(4) cass pool
in winter, the temperature is low, and this link is completely outdoors. the water inlet pipeline, sludge discharge pipeline and reflux pipeline are all in the freezing zone. in order to solve this problem, it is necessary to heat preservation treatment of each pipeline, such as timely breakage of ice in the pool. clean the aisle snow in time on snowy days to prevent skiing from causing personal injury.
(5) mud storage tank
in winter, the temperature is low, and the structure is completely outdoors. to solve this problem, operators must observe the liquid level at any time to ensure that the agitator is open during operation. if ice is found, it will break in time.
(6) desliming machine room
in winter, indoor humidity is high, humidity is high, night temperature is too low, windows are closed, causing indoor air deterioration, water pipelines are easy to freeze and crack. to solve this problem, operators must properly open doors and windows or ventilation fans, and observe the status of various equipment at any time to prevent frost cracking of water pipelines.
(7) disinfection pool
the indoor temperature is too low at night in winter. to solve this problem, according to the weather conditions, the air conditioner is switched on and off at any time to ensure the normal operation of the ultraviolet disinfection system.
2. process winter operation management
because of the low temperature in winter and the decrease of sludge activity, according to the characteristics of the treatment process, various links of sewage treatment are adjusted to ensure the sludge activity and the treatment effect of sewage. make every effort to meet the requirements of winter process operation. because of the low ambient temperature, the aeration time should be prolonged, the sludge concentration should be increased, the sludge age should be increased, and the treatment effect should be guaranteed according to the actual amount of treated water.
3. preparations for winter operation
the winter time is long and the monthly average temperature is low. in order to ensure the normal operation of the equipment in winter, the corresponding anti-freezing measures must be taken. before entering the winter operation, the following tasks are usually done:
(1) overhaul and maintenance of equipment should be carried out, including the replacement of lubricating oil. all overhaul projects should be completed as soon as possible before winter arrives.
(2) after entering winter, all sewage treatment areas and sludge treatment areas must maintain continuous operation. after entering winter, the structures are not allowed to be emptied to avoid freezing and thawing of water in ponds.
(3) ensure the normal operation of heating equipment in winter. before entering winter, the heating equipment and heating pipelines in the factory are checked and maintained in an all-round way to ensure continuous and normal operation during the heating period in winter. heating needs to meet the following requirements: the minimum indoor temperature of each workshop at night should be kept above 5 degrees. attention should be paid to the closure of doors and windows, the installation of cotton curtain on workshop doors, the change of indoor temperature should be paid more attention when inspecting, and the insulation of some freezable wellbores should be done well.
(4) make a thorough dredging and cleaning of sewage and rainwater pipelines before winter.
(5) strengthen the inspection of key parts, especially septic tanks, mud storage tanks and cass tanks. in ice and snow weather, operators should pay attention to prevent slip accidents when inspecting or operating structures. the grid slag, scum and dewatered sludge in each workshop should be cleaned and transported in time.
source: polaris water treatment network
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