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Electroplating wastewater

Electroplating wastewater

1. Project background

  There are currently more than 60 various electroplating enterprises in an electroplating industry base. The average daily discharge of wastewater is 200m3. After physical and chemical treatment, it enters biochemical treatment. The biochemical treatment uses A2O process + secondary sedimentation tank + high density sedimentation tank. Into the natural river.


There are problems:

  (1) Unknown reasons lead to a large amount of floating mud on the surface of the second settling tank-dead mud

  (2) Abnormal ammonia nitrogen in the effluent of the second settling tank-loss of nitrification capacity

  (3) COD abnormality in the secondary sedimentation water-low VSS content in sludge

  (4) The SS of the second submerged water is too high-dead mud

  Due to the above problems, a large amount of PAC, PAM and chemical oxidants are added to the secondary sedimentation water to reduce the COD, ammonia nitrogen and SS in the water, which is expensive and difficult, and increases the salinity of the external drainage.


2. Purpose of using Making Green strains

  Improve the activity of sludge by adding MicroPlex-COD bacteria in the existing biological pool, and then use nitrifying bacteria in the aerobic section to strengthen the nitrification reaction in the biochemical section to solve the problem of COD and ammonia nitrogen excess risk It can also meet emission standards.


3. the solution

  Because the main wastewater comes from various electroplating production processes, the wastewater composition is complex, and there are many types of heavy metals. After the physicochemical process, the salinity of the wastewater is high, with an average value of about 12000mg / L, and poor biodegradability. According to the historical operation data of the AAO pool And on-site sampling and analysis, take the following measures:

  (1) Increase the COD concentration in the influent and increase the amount of effective components in the sludge

  (2) Increase the amount of sludge and reduce the content of dead sludge in the system

  (3) Add nitrifying bacteria from Mianjin Company to start the nitrification reaction in a short time

  (4) Add COD bacteria from Mianjin Company to rapidly improve sludge activity

  (5) Reduce the amount of aeration to avoid sludge deflocculation caused by over-aeration

  (6) After nitrification is established, add total nitrogen removal bacteria and carbon source to start denitrification and denitrification.

4. Recovery time and dosage of bacteria

  4.1. Dosage of bacteria agent:

  Nitrogen bacteria 200 kg COD bacteria 100 kg Total nitrogen removal bacteria 50 kg High-efficiency carbon source 5000 kg

  4.2. Recovery time: five days

5. Data comparison before and after dosing


Before use

After use

Average COD of the secondary sedimentation



The average ammonia nitrogen in the second precipitation



The average SS of the second sink



The average total nitrogen in the secondary precipitation

















6. Conclusion

  (1) Using nitrifying bacteria can quickly establish a nitrification reaction, the time is 3-5 days, the ammonia nitrogen in the effluent is stable and meets the standard;

  (2) After the use of COD bacteria, the COD of the effluent decreased by 35mg / L, and the removal rate increased by 27%;

  (3) Using Mianjin's environmentally friendly high-efficiency carbon source and total nitrogen removal bacteria, total nitrogen can also reach the standard steadily;

  (4) After the inoculant is added to the water, the subsequent physical and chemical agents are stopped and the salt of the external drainage is reduced.