Cultivation of bacteria for wastewater treatment in paper mill

This is the cultivation scheme of ordinary sewage treatment plant, please refer to it! I hope I can help you, and the sewage purification team will serve you wholeheartedly!

Process debugging of sewage treatment plant and introduction of bacterial culture scheme

I. Purpose

1. Check whether the system design of the sewage treatment plant is reasonable and whether the construction meets the design requirements;

2. Determine the best operating conditions, mainly the determination of various process parameters, such as: the best operating water level of the water pump, the cyclone speed of the cyclone grit chamber, the best sludge load, the sludge age, the sludge reflux ratio, the sewage reflux ratio, the residual sludge discharge, and the best aeration amount of the reaction tank;

3. Find the existing problems and analyze and solve them one by one, so as to accumulate experience data for future formal operation.

Second, the prerequisite

1. The water supply is sufficient, the surrounding pumping stations and pipe networks should have the ability to continuously transport sewage to the sewage treatment plant, and the trial operation of water purification linkage has been completed;

2. The linkage test run of all kinds of equipment is completed, with complete functions and good performance, which meets the process requirements, and the problems found in the linkage test run should be properly handled;

3. After the whole process of clean water linkage test, it is confirmed that there is no problem that directly affects the trial operation of bacterial culture;

4. The personnel, materials and tools needed for the training process have been prepared;

5. Personnel in each position must undergo training and internship to meet the requirements of being familiar with the responsibilities of this position and being competent for the work of this position;

6. The field staff are required to be present 24 hours a day, and the staff shall implement three shifts and four shifts. The number of people on the day shift is 15 (including engineers), and the number of people on the night shift is 6 each;

7. The sludge treatment system has been completed and the disposal of dehydrated sludge has been determined.

Three. Outline of cultural plan

Considering the cost saving and easy concentration of manpower and material resources, the whole training process is planned to be carried out in three stages. The first stage: firstly, the activated sludge was cultured in the north pond of 1# reactor (55,000 tons/day) and the south pond of 2# reactor (55,000 tons/day); The second stage: after culturing the activated sludge in the north pond of 1# reactor and the south pond of 2# reactor, culturing the bacteria in the south pond of 1# reactor and the north pond of 2# reactor; The third stage: stable operation and debugging of phosphorus and nitrogen removal; Finally, it enters the continuous production operation.

Fourth, the cultivation method.

Intermittent water change and continuous water change are adopted.

Verb (abbreviation of verb) Source and quantity of strains

The strain comes from the sludge concentration tank of the first and second phase project of Datansha Sewage Treatment Plant. The sludge in the concentration tank is pumped into a 4,000-L mud tanker by a mobile submersible pump DN 100, and then the concentrated sludge is transported to the north tank side of 1# reaction tank and the south tank side of 2# reaction tank by the mud tanker, and then DN 100 is used. * * * 2) Pump the sludge directly into the tank. After calculating the volume and process requirements of the reaction tank, it is required that the strain with a water content of 97% is about 5600M3 (excluding special circumstances such as strain death encountered during debugging).

Six, cultural time limit for a project

The cultivation needs 120 days, including 45 days in the first stage, 30 days in the second stage and 45 days in the third stage.

Seven. manning

Set up the following working groups according to cultural needs:

1. Command group: composed of company leaders;

2. Cultural and technical team: 3 process engineers, 2 mechanical engineers,/kloc-0 instrument engineers and 2 electrical engineers are needed;

3. Operation team: 5 process technicians, 4 mechanical technicians, 3 electrical technicians, 4 mechanical maintenance workers, 3 electrical maintenance workers and 6 process technicians are needed;

Eight. work assignment

1. technical management: make various technical plans in the process of strain cultivation, guide and adjust various technical parameters, adjust the cultivation plan according to the actual work progress, and supervise the completion of the cultivation plan, which is the responsibility of the cultivation technical team;

2. Operation management: According to the culture plan, carry out various corresponding operations on site, including installing portable submersible pump to transport strains, controlling inlet and outlet valves, and adjusting aeration in the pool. The operation team is responsible for this work, and it runs continuously in three shifts: day, noon and night.

Nine, the materials and equipment needed to cultivate bacteria

1. Communication equipment: 8 walkie-talkies;

2. Strain delivery pumps: 3 (DN100); );

3. Mud tanker: two (4000 L)； each);

4. Temporary power supply for strain transportation: four sets;

5. A set of mechanical maintenance tools and an electrician maintenance instrument;

6. Portable dissolved oxygen measuring instrument.

X. Specific operation of cultivating bacteria

Schematic diagram of the number of reaction tanks and secondary sedimentation tanks

1, the first stage: 1# reactor north pond and 2# reactor south pond activated sludge culture.

Activated sludge strains in the first and second plant areas are pumped by sludge pumps into mud tankers (two sets), which are respectively transported to the south side of 1# reaction tank and the north side of 2# reaction tank, and then pumped into the tanks by pumps (one sludge pump for each tank and two pumps for * * *).

The specific operation steps are as follows:

(1) Open the main inlet valve of high inlet well and the main valve of east-west water distribution.

(2) Open the inlet valve of the grille channel 1#~4#, close the two overflow valves, and adjust the four adjustable weir doors with water outlets to the lowest position.

(3) Open all inlet valves of 1# reactor north pool and 2# reactor south pool, and close all inlet valves and override valves of 1# reactor north pool and 2# reactor south pool.

(4) Adjust the water outlet adjustable weir gates of the north pond of 1# reactor and the south pond of 2# reactor to the lowest position.

(5) Open the water inlet valves and mud outlet valves of the secondary sedimentation tank 2# and 4# in the water distribution well, and close the water inlet valves and mud outlet valves of the secondary sedimentation tank 1#, 3#, 5# and 6#.

(6) Turn on the water pump of the off-site pumping station to deliver water to the factory. At this point, open the drum grille and grit chamber equipment. After passing through the grid and grit chamber, the sewage enters the north tank of 1# reaction tank and the south tank of 2# reaction tank.

(7) When sewage submerges the aeration pipe, turn on the blower, gradually open the air valves in each section of the north tank of 1# reaction tank and the south tank of 2# reaction tank, and then start pumping strains into the tanks, and adjust the aeration amount to fully stir and suspend the sludge.

(8) Check the installation size of the agitator, open the agitator one by one, conduct no-load test, and check the no-load operation of the agitator;

(9) When the water submerges the stirrers, turn on all the stirrers for stirring.

(10) When the sewage level rises to the height of the outlet weir, turn off the sewage pump of the off-site pumping station to stop supplying water to the factory, continue to add strains, adjust the aeration rate, and enter the static stuffy exposure until the strains are added.

(1 1) After adding strains, the static closed air is exposed for 12 hours, and then the sewage pump of the off-site pumping station is started again to supply water to the factory, and the intermittent water change stage is entered. Intermittent water change is about 20,000 m3, the reaction tank is half full of water, and the flow rate is 4000m3 per hour. The water pump is turned on (off) every 5 hours.

(12) After the sewage flows into the No.2 secondary sedimentation tank, start the sludge scraper to return the sludge to the sludge return pump house through the sludge discharge valve, and start the sludge return pump according to the sludge level to transport the precipitated sludge back to the reaction tank.

(13) Check the installation dimensions, support and bearing lubrication of the mixed liquid reflux pump and sludge reflux pump;

(14) Check whether the pipeline valves are set correctly and whether the power supply and distribution system is in good condition;

(15) Intermittent water change lasts about 20 days. By detecting sludge sedimentation, such as SV > 15, the continuous water exchange stage can be entered. The sewage pump of the off-site pumping station continuously supplies water to the factory, and the flow rate is controlled at 50,000 tons/day. Control the aeration rate to DO= 1~2mg/l until the activated sludge in the south pond of 1# reactor matures and the MLSS reaches 3500mg/l, and enter the next stage.

2. The second stage: 1# reactor south pond and 2# reactor north pond activated sludge culture.

Since the sludge return pump rooms of the south and north ponds of 1# and 2# reactors are connected through sludge return channels, the mature activated sludge strains in the south pond can be directly added to the south pond through the sludge return pump of 1# reactor, and the mature activated sludge strains in the south pond can be directly added to the north pond through the sludge return pump of the north pond of 2# reactor.

3. Specific operation steps:

(1) Open all inlet valves of 1# reactor south pond and 2# reactor north pond, and adjust the outlet adjustable weir doors of 1# reactor south pond and 2# reactor north pond to the lowest position.

(2) A sewage pump is added to the off-site pumping station to supply water to the factory.

(3) When the sewage submerges the aeration pipe, the sludge reflux pump is started, and activated sludge strains are added into the reaction tank through the reflux pump for culture.

(4) Increase the blower, gradually open the air valves in each section, and adjust the aeration rate to fully stir and suspend the sludge.

(5) When the sewage submerges the stirring blades, all stirrers are turned on for stirring.

(6) When the sewage level rises to the height of the outlet weir, open the inlet valve and sludge discharge valve of the secondary sedimentation tank of 1#, 3#, 5# and 6# distribution wells.

(7) When the sewage flows into the 1#, 3#, 5# and 6# secondary sedimentation tanks and drowns the rotating arm of the mud scraper, start the 1#, 3#, 5# and 6# mud scraper.

(8) When the water levels of the secondary sedimentation tanks 1# and 3# rise to the height of the outlet weir, according to the sludge level of the south pond of the 1# reaction tank, a sludge reflux pump is added to accelerate the backflow of strains to the south pond. When the water level of the No.5 and No.6 secondary sedimentation tanks rises to the height of the outlet weir, according to the sludge level of the No.2 reaction tank, a sludge reflux pump is added to accelerate the backflow of strains to the north tank.

(9) By adjusting the inlet and outlet valves, the number of sludge reflux pumps and the aeration rate of the south and north sections of 1# reaction tank, the sludge in the south and north sections will be kept stable until it matures, and the sedimentation ratio SV > 15 and MLSS > 3500mg/L will be tested before entering the next stage.

4. The third stage: stable operation stage

The main work at this stage is as follows:

(1) Because the bacteria culture has been completed in the previous stage, all ponds in this stage discharge excess sludge according to the actual situation of the process.

(2) Adjust the water inlet valve, water distribution valve, air valve and sludge reflux pump of each pool to keep the balanced and stable operation of each pool.

(3) Open the sewage reflux valves of 1# and 2# reaction tanks and start the sewage reflux pump.

(4) Under the guidance of laboratory analysis data, we began to test the effect of phosphorus and nitrogen removal, and gradually ensured that the five indexes of effluent were qualified.

XI。 Safeguard measures for trial operation

1. Set up a command group and two subordinate working groups.

(1) Command Team

(2) bacterial culture technical team, 8 people.

(3) Operation team, including technicians 12, skilled workers 13 (24-hour working system, four shifts in three shifts, 7 in daily shift and 6 in night shift).

2. Establish a regular meeting system

(1) The command group holds a regular meeting every three days to study, discuss and coordinate to solve the problems in the trial operation, implement the high-speed trial operation scheme or steps in time according to the actual operation situation, and issue corresponding instructions to the two subordinate working groups;

(2) The two working groups operate according to the instructions of the command group and the commissioning plan, hold group meetings every day, summarize and record the problems found, and the team leader reports to the command group;

3. Establish a problem reporting and feedback system.

Twelve. Possible problems and solutions

1. Insufficient activated sludge: calculate the sludge shortage according to the laboratory data, and replenish the strains as soon as possible;

2. Death of activated sludge: analyze the specific reasons, and adjust the gas volume, inflow and return sludge volume accordingly;

3. Too many white bubbles on the pool surface: reduce the number of blowers or turn down the air outlet valve to increase the sludge reflux;

4. Poor sludge sedimentation: reduce water inflow and aeration, and increase sewage retention time;

5. Denitrification and floating of sludge: reduce the last aeration amount of aeration tank and increase sludge reflux;

6. The effluent SS is on the high side: reducing the influent load or aeration and increasing the sludge discharge;

Conclusion: There are many problems in the debugging process of waterworks, which can provide basis and preventive points for later operation. I hope everyone can carry out debugging and acceptance smoothly.