Solving sludge bulking -- a sewage treatment plant in Taiyuan, Shanxi Province

  Application background:  

A sewage treatment plant in Taiyuan, Shanxi Province designed daily treatment water of 160,000 m3/d, the main process is improved AAO process, the treated water quality can meet the "Discharge Standard of pollutants for Urban Sewage Treatment Plant" (GB18918-2002) level A discharge standard, due to the design and construction of the secondary sedimentation tank of the water plant and low winter temperature caused by sludge expansion problems, In winter, there will be problems such as poor sludge settling and serious sludge running in secondary sedimentation tank. The operation pressure of subsequent advanced treatment system is relatively high. In order to ensure the standard discharge water plant usually adopts the strategy of reducing the treated water amount, which cannot achieve full load operation.

  Solution:  

By adding NFSSS nano-flocculant into the secondary sedimentation tank, the dosage is controlled at about 20mL/m3 to strengthen the rapid sedimentation of sludge in the secondary sedimentation tank and reduce the mud level rapidly, so as to ensure the full load operation of the water plant.

   Effect display:  

• Water quality impact:

The addition of the agent has no adverse effects on the biological properties of activated sludge and does not increase the concentration of pollutants.

• Settlement performance:

After the water intake of the sedimentation tank was increased, the mud level was gradually reduced through the addition of NFSSS nano-flocculant, and the mud running problem was effectively solved within half an hour.

Precipitation actual effect display