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Due to the large fluctuations of industrial production drainage, water quality composition is complicated, resulting in the difficulty of wastewater treatment is relatively large. When the system encounters impact, more difficult, some owners will use to increase the sludge concentration, increase dissolved oxygen method to ensure that the effluent stability standards, is this really effective? Today we share with you a sludge aging The case.
Background introduction
This is a light industry wastewater treatment station. Due to the breakdown of the production workshop, the amount of water produced for drainage, COD and SS is about 50% more than usual. At the time of the accident, the owners of sewer stations significantly reduced the excess sludge emissions while putting the third blower in operation (4 in total, 3 in 1 reserve and usually only 2 in operation) to meet the impact load.
Just run for 7 days, the webmaster found:
Aerobic tank dissolved oxygen is about 3.5mg / l (usually 1.5mg / l), the pool of water muddy, the surface of the tan foam, the bubble is relatively large, not easy to rupture, the foam layer is relatively thick (see below);
The SV30 increased from 30% to 70 ~ 80%, the sedimentation speed obviously slowed down and the SVI reached above 200ml / g.
The concentration of SS in the secondary sedimentation tank effluent continued to increase, with a significant increase or significant increase of COD. However, the COD after filtration was slightly higher than that of normal COD.
Cause Analysis
Faced with such a situation, we must first analyze the reasons for the problem, and then according to the reasons, to take appropriate measures.
Through the communication with the production, it is confirmed that the accident water discharged is the process water produced, which contains no toxic and inhibitory components. Combined with the secondary sedimentation tank effluent COD after filtration and normal operation of the COD concentration although slightly increased, but little increase, indicating that the impact load has been completely degraded.
Now, let's check the aerobic system:
In the senses, the basic smell of aerobic pool often smell the smell of water, aeration pool water muddy, no clear supernatant layer;
Directed microorganisms are also converted from active clockworms, thrips, etc. to mane worms, caseworms, rotifers, etc., while their numbers are also slowly declining with a small amount of shieldworms;
From the technical indicators, dissolved oxygen and SV30 are maintained at a high level, SVI is also at a high value.
From the above phenomena and data, this system is in a state of sludge aging. The abnormal operation of the production line caused by abnormal drainage, although significant COD impact load, but the aerobic system itself has a certain impact resistance, did not have to do too much adjustment, and the owners "in order to avoid water quality changes Poor, increased sludge concentration, increased dissolved oxygen value ", this operation leads to food micro-imbalance, a substantial decline, rapid degradation of aerobic sludge de-floc. From the water point of view, is the secondary sedimentation tank effluent suspended solids increased significantly, COD increased.
Operational recommendations
Industrial wastewater treatment, it is difficult to stop the sewage station from the impact of production and drainage. Encounter an exception, do not be nervous, it is recommended according to incoming water quality, take appropriate measures and contingency plans, such as:
First determine the water quality of abnormal wastewater, non-toxic, inhibitory ingredients, such as strong oxidants, heavy metals;
Determine the amount of abnormal wastewater, according to the pond capacity, estimated abnormal wastewater to reach the aerobic system time, and then at the right time, take appropriate measures;
According to the COD load of abnormal wastewater, adjust the micro-ratio of aerobic system and air supply;
If abnormal wastewater contains refractory COD, or high ammonia nitrogen, total phosphorus, need to be targeted to consider increasing coagulation and sedimentation or other emergency measures.
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