Question

In: Civil Engineering

Primary sludge containing trickling filter sludge is gravity thickened in a circular tank with a diameter...

  1. Primary sludge containing trickling filter sludge is gravity thickened in a circular tank with a diameter of 12 ft, and side water depth of 10.0 ft. The applied sludge is 2600 gpd with 4.5 % solids (by wt.) and the thickened sludge withdrawn is 1300 gpd at 7.5 % solids (by wt.). The sludge blanket in the tank is 3.0 ft deep. For odour control, and to enhance thickening, 45,000 gpd of treated wastewater is pumped to the tank along with the sludge to increase the overflow rate. Calculate the solids loading on the tank, the solids capture efficiency, the overflow rate, and the solids retention time in the tank, assuming that all the tank solids are in the sludge blanket.
  2. If the thickened sludge from the tank that is anaerobically digested, at an SRT of 15 days with a VS destruction efficiency of 50%, calculate the size of the anaerobic digester, and the daily methane production rate. Assume that the volatile fraction of solids is 70%.

Solutions

Expert Solution

I think the rate of treated wastewater should be 4500gdp rather than 45000 gpd


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