People engaged in environmental protection water treatment industry should know that if they do not follow the correct operating procedures when working in sewage treatment plant or using water treatment equipment, it is easy to have accidents. Recently, many projects in China have such accidents. Water Expo network Xiaobian today to bring you some of the operating procedures of sewage treatment plants and water treatment equipment, is very worth a look!

Safety operation regulation of sewage treatment plant

Safety operation procedures for intake pump house

1、 Preparation of sewage before entering the pool

1. According to the dispatching instruction, turn on the equipment specified in the instruction in time.

2. Open the gate hoist. If it is turned off by electricity, the handle must be separated from the rotating shaft. If it is turned off by manpower, turn off the power and insert the handle to shake.

3. When the gate hoist is opened and closed, it should be used by the machine. It can only leave the machine after it is shut down. It is not allowed to leave immediately after it is put into operation.

4. Open the rotary grille in strict accordance with the use requirements of the rotary grille, keep the machine for ten minutes, check whether the mechanical equipment is abnormal before leaving the machine, and never leave the machine immediately after it is put into operation.

5. When the water level in the pool reaches the elevation specified by the process, the water pump can be started, and the on duty dispatcher can be contacted according to the water level of the pool.

2、 Starting and running

1. Open the inlet and outlet gates of the switching well and close other gates according to the dispatching instructions.

2. Before starting the water pump, clean water should be injected into the connecting pipe on the stuffing box to lubricate the rubber bearing. After the water comes out of the pump, it can be turned down. It is appropriate to have water dripping out. Check the oil level of the bearing position of the pump to ensure that the water and oil passages are smooth.

3. Before starting the water pump, check whether the connecting parts are loose. Turn the coupling by hand to see whether it is flexible and whether there is noise in the pump. 4. When the water pump is started, no one is allowed to stand beside the machine. After starting, the machine should be kept for at least five minutes to check the condition of the equipment. If there is abnormal vibration and sound or the water outlet condition is abnormal, the machine should be stopped immediately for inspection. It is not allowed to leave the machine immediately after putting into operation.

5. During the operation of water pump, the following matters should be paid attention to:

(1) Check whether each instrument works normally and stably. Pay special attention to whether the ammeter exceeds the rated current of the motor. If the current is too large or too small, stop the machine immediately for inspection.

(2) Check whether the flow of the water pump is normal, check the water flow of the outlet pipe, estimate the operation time of the water pump according to the water level change of the pool, and contact the dispatcher in time.

(3) Check whether the pressure plate of the water pump packing is hot and whether the water dripping is normal, at least eight times per shift.

(4) Pay attention to the noise and vibration of the unit.

(5) Check the temperature rise of the bearing motor, stop the machine immediately if any abnormality is found, and inform the on duty dispatcher.

(6) Check whether the grille and water inlet are blocked and whether the water level is too low.

6. The pump motor is generally allowed to start six times continuously under cold state, and the interval between the two times is at least 15 minutes.

3、 Shutdown

1. When the process requirements are met or the dispatching instructions are accepted, the machine shall be shut down immediately and the gate shall be closed. After the machine is shut down, the equipment in use shall be cleaned and the surrounding of the equipment shall be cleaned.

2. After shutdown in freezing season, the accumulated water in the pump should be removed to avoid damaging the parts.

3. The standby pump should rotate the pump shaft 180 degrees by hand every week °， Pay attention to the oil level mark at the bearing and add oil in time.

4、 Use of maintenance pump, submersible pump and fan

1. The maintenance pump should be opened according to the regulations of the production department, and it should be clean and intact when not in use.

2. The submersible pump should pay attention to the water level of the pool, and should be turned on immediately. People should not leave the machine, and the pool will stop when it is clean.

3. The fan shall be opened and closed according to the operation experience of the operator.

5、 Treatment of equipment accident

1. In case of any abnormal condition of the equipment, stop the machine immediately, report to the dispatcher and record it in the duty record book.

2. In case of shutdown due to electrical reasons, immediately report to the dispatcher for handling, do not repair the electrical equipment by yourself, and record it in the duty record book. 3. In case of any abnormal phenomenon of the motor, stop the operation immediately, report to the dispatcher, ask for instructions, and record it in the duty record book. 4. When the gate and grille are blocked by foreign matters, it shall be removed in time. When the rotating grille has an accident signal, it shall be shut down immediately, reported to the on duty dispatcher for instructions, and recorded in the on duty record book.

Safety operation rules for rotary grille

1、 Before starting the grille, the operator must check whether there is any abnormality in each part of the grille under the condition of power failure, and lubricate and maintain the grille according to the regulations.

2、 Turn on the grid power and supply voltage to the grid.

3、 Put the change-over switch in the manual position, start the grid operation, observe the grid operation, slag discharge and slag discharge, and check for noise and abnormality. If there is any abnormality, stop the vehicle immediately and solve it according to the regulations.

4、 After the manual operation of the grille is normal, it can be put into the automatic operation state. The operator can watch the machine for 10 minutes to observe the operation, and then inspect the grille at least once every half an hour.

5、 If debris gets stuck in the process of grid operation, it should be able to stop automatically and give an alarm. At this time, the shift leader should quickly organize personnel to eliminate the fault and resume production without power supply.

6、 In case of any abnormal situation during the operation of the grille, the operator should find it in time, press the emergency stop button, cut off the power supply, report to the production department, and organize personnel to find out the situation and remove the fault.

7、 After the grid work, the operator must cut off the grid power supply, clean and maintain the grid, and fill in the work record.

Compressor safety operation procedures

1、 Preparation before starting:

1. Before starting the compressor, the operator on duty of the aeration tank must be informed, and the channel valves of each aeration tank must be opened in advance（ According to the need and possibility, air can also be sent to the secondary sedimentation tank, grit chamber and back tank of pump room.)

2. Check the oil level of the lubricating oil tank, and make up if it is insufficient.

3. Check that the unloading device port should be in the fully open position (the color code is half black and half white).

4. Turn on the electrostatic precipitator and keep it in working state. Check the working current. The normal value is not more than 25mA. At this time, if there is discharge sound in the electrostatic precipitator and the ammeter swings continuously and greatly, the electrostatic precipitator shall be shut down temporarily and the superior shall be consulted.

2、 When the above items are completed, the compressor can be ready to start

1. Switch on the low-voltage distribution panel for power transmission.

2. Place the field remote control switch on the instrument cabinet at the field position

3. Turn the main switch of the instrument cabinet to the "on" position.

4. Turn on the control voltage of the instrument cabinet with the key. At this time: the auxiliary oil pump, oil cooler fan, oil separator, sound cover and exhaust fan should be put into operation at the same time; The green indicator of control voltage and auxiliary oil pump are on.

5. Check the opening indication of diffuser, which should be above 45%.

6. Check the oil pressure and differential pressure. Oil pressure > 1.5 bar, oil differential pressure ≠ 0.8 bar

7. If the above items are normal, 3 minutes later, the green indicator light of "compressor ready to start" is on and does not disappear, then the main motor can be started. Press the start button of the compressor, the main motor starts to run, after reaching the normal speed, the unloading device port automatically opens and closes, the auxiliary oil pump automatically stops working, and the compressor runs normally. At this time, pay attention to the oil pressure between 1.5-2.5 bar. Less than 1.2 bar will alarm.

8. If the main motor is not started in time after the green light of "compressor ready to start" is on, and the light goes out again, press the start button of auxiliary oil pump again and repeat the above sequence.

9. If there is an abnormal situation in the process of starting the auxiliary oil pump and the red and yellow alarm lights are on, stop the operation of the auxiliary oil pump, find out the cause and eliminate it, press the reset alarm button to eliminate the alarm, and then press the start button of the auxiliary oil pump to start again according to the above sequence.

10. If the main motor is not started successfully for some reasons, it must be started again after one hour.

11. If another compressor is in working condition before starting, the opening of the diffuser of the former compressor must be reduced to 45% before starting the compressor.

3、 Compressor operation:

1. In the working process of the compressor, the operator on duty must always pay attention to whether the compressor works abnormally, and pay attention to the changes of sound, temperature and oil pressure. Whether the three-phase current of the motor is balanced, whether there is noise and abnormal vibration.

2. Check and record all instrument data in one hour: normal value: working current of electrostatic precipitator is 25mA; working current of motor is not more than 400A; inlet air temperature (measured) is more than 900mbar; outlet air pressure is not more than 0.68bar; oil pressure is 1.5-2.2bar; oil pressure difference is 0.2bar (not more than 0.8bar); lower limit oil temperature of oil cooler is not more than 50c; oil temperature of oil tank is not more than 50c (measured)

3. After any safety device gives an alarm or cuts off the operation of the machine, the reason must be found out, and the fault can be completely eliminated before it can be put into operation again, and the written record shall be made.

4. The compressor operator on duty should adjust the air supply volume at any time according to the order of the production dispatcher, increase the air volume (increase the opening degree of the diffuser) or reduce the air volume (decrease the opening degree of the diffuser).

5. When the two computers are connected, the working state of the two computers should be as close as possible.

4、 Shutdown:

Before shutdown, all gas departments must be informed to make preparations.

1. During normal shutdown, the opening of diffuser is reduced to 45%.

2. Press the stop button of the main motor, then the auxiliary oil pump should be put into operation automatically and run continuously for 5 minutes.

3. After the auxiliary oil pump stops working automatically, turn off the voltage of instrument cabinet, power supply of low voltage cabinet and electrostatic precipitator in turn.

4. In case of any possible damage to the compressor, the person on duty can quickly press the emergency stop button to stop the compressor (as far as possible).

Safety operation procedure for centrifugal blower

The operator must be familiar with this procedure before starting the machine and operate the blower in strict accordance with this procedure.

1、 Start up 1. Check the oil level of the oil tank, which should be between the upper and lower limits of the oil dipstick.

2. Inform the substation to supply power to the unit.

3. Check the on-board control cabinet, there should be no alarm display, if there is an alarm, find out the reason and eliminate it

4. Select "manual" state（ Touch the "manual" key with your finger.

5. Check whether the pressure relief valve is in the open position (the green light of pressure relief valve is on). Check the minimum opening of the diffuser (the minimum green light of the diffuser is on).

6. After the above inspection and confirmation that the fan can be started, press the start button to start the blower

① The auxiliary oil pump is pre lubricated for one minute (the green light of the auxiliary oil pump is on).

② The blower can start to operate (the green light for blower operation is on).

③ The pressure relief valve is closed slowly (the green light is off when the pressure relief valve is opened, and the green light is on when the pressure relief valve is closed two minutes later).

④ The auxiliary oil pump stops running (the green light of the auxiliary oil pump is off and the stop red light is on). So far, the blower has been successfully started and can be put into operation.

⑤ If the blower fails to start as scheduled after pressing the start button, the low oil pressure alarm red light will be on one minute later, and the whole starting process will stop. It is necessary to find out the cause, eliminate the alarm and restart after solving it.

2、 Operation

1. After the fan is started, the opening of the diffuser can be adjusted slowly according to the production needs, and controlled by the "open" key and "close" key of the diffuser to ensure the necessary air volume.

2. When the fan is running, it is necessary to monitor the fan frequently, and pay attention to the current, oil temperature, oil pressure, air inlet vacuum, sound, fan, temperature and vibration of the fan. Make records on time. If there is any abnormality, find out the cause in time, eliminate it and report to the production department. If necessary, take emergency stop measures (use carefully).

3、 Stop the operation of a certain fan due to the need of production, maintenance and repair.

1. Reduce the opening of the diffuser to the minimum (the minimum indicator green light of the diffuser is on).

2. Touch the "stop" button of the fan with your finger, and the shutdown procedure starts

① The diffuser opening is reduced to zero (if the first step is not carried out).

② The pressure relief valve opens automatically (the green light of pressure relief valve is on).

③ The compressor stops running (the red light is on when the compressor stops running).

④ The auxiliary oil pump is put into operation automatically, and the whole machine stops in 3 minutes, and the whole stop procedure ends here.

3. In the process of shutdown, the operator should continue to monitor the changes of the machine instrument and the whole state, and make a record at the end. Note: 1. During the operation of the fan, the oil cooling fan runs when the oil temperature is higher than T1 and stops when the oil temperature is lower than T2 (T1 and T2 are the upper and lower limits of the oil temperature, which shall be adjusted and confirmed by special personnel according to the needs). 2. The lubricating oil pressure of the fan varies between the upper limit (about 2.5 bar) and the lower limit (1.5 bar) according to the oil temperature. 3. The maximum current of the fan shall not exceed 345a. 4. The indication of fan opening should be selected between 0% and 70%. 5. The indication of air inlet vacuum degree of the fan should not exceed 2.5. 6. The fan oil pressure difference is normal in the green section (no more than 0.7 bar) without short-term mutation.

Safety operation regulation of aerated grit chamber

1、 According to the process requirements and operation conditions, open and close the inlet and outlet gates of the aerated grit chamber and the air valve to regulate the air volume.

2、 In case of emptying during operation, the Inlet Sluice shall be closed and the emptying Sluice at the bottom of grit chamber shall be opened.

3、 According to the daily amount of sand, timely sand, regularly remove scum.

4、 It is required to collect water samples every two hours and send them to the laboratory for testing. 5、 Always check whether the overflow pipe and slag well are blocked, and timely clean up if any.

Safety operation rules of sand scraper

1、 Preparation for driving:

1. Check the lubricating oil level of the air compressor, and add enough oil when it is lower than the lower limit.

2. Check the oil quantity of the oil mist device, and top up if it is insufficient.

3. Check the water level of the water distributor and let out the water. The above inspection must be carried out when there is no pressure in the air tank.

4. Check whether there are sundries on the running road of the sand scraper, and remove them if any.

5. Turn on the power and manually test whether the alarm bell and the front and rear limit are effective.

2、 Start operation: after the above inspection and treatment, the machine can be started. If it fails, it must be repaired immediately.

1. Start the random air compressor, and pay attention to the operation condition and pressure rise of the air compressor.

2. Check whether the two scraper arms stop at high position. If not, they must be lifted to high position and fixed reliably. When the scraper arm is in the low position, it is strictly forbidden to reverse the sand scraper.

3. Reverse the sand scraper to the terminal position and stop.

4. Lower the two scraper arms to the mud scraping position.

5. Press the forward button of the sand scraper to make the sand scraper move forward to work. When the sand scraper is running, the operator must not leave, and must pay attention to and control the running state of the sand scraper at any time.

6. During operation, if abnormal noise, vibration, limit failure or air pressure exceeding

When the compressor does not stop at 7 bar, the operator must stop the compressor immediately before starting it.

3、 Shutdown:

1. The sand scraper must be parked at the designated position after operation.

2. Lift the two scraper arms to high position and fix them reliably.

3. Turn off the switches in the control cabinet and turn off the power.

4. Make operation records as required.

Safety operation procedure for cqb20 sand scraper of aerated grit chamber

1、 Preparation before driving:

1. Check the lubricating oil level of the air compressor, and add enough oil when it is lower than the lower limit.

2. Check the oil quantity of the oil mist device, and top up if it is insufficient.

3. Check whether there is water in the water separation air filter, and discharge all the water when there is water（ The above inspection must be carried out without pressure in the air tank.)

4. Check whether there are sundries on the running road of the sand scraper, and ensure that the running road is free of obstacles. 5. Loosen the safety handle for fixing the scraper.

2、 Adjustment operation:

1. Turn on the power switch and put the selection switch in the working position.

2. Test alarm: press the "test alarm" button and the alarm bell rings; Press the "off alarm" button to stop the alarm.

three