Abstract
Mannheim's large treatment plant (Qtr = 14.000 m3/h) is being expanded on the principle of dry bed filtration. In the first stage of expansion a filtration system of 32 filters covering a total area of 2.784 m2 is being added to the existing sludge plant. 24-h composite samples of the effluent have to meet the following specifications: 80 mg/l COD and 20 mg/l BOD5. Before the contract was awarded extensive experiments were conducted on the plant grounds in Mannheim. The performance capability of the system was proven (see Prof. Ruffer's paper). It was shown that at filtration rates of around 5 m3/m2·h, the suspended solids in the effluent could be kept under an average of 8-9 mg/l, the COD under 80 mg/l, and the B0D5 under 20 mg/l. The advantage of the system lies in its ability to supply the biologically active filter with atmospheric oxygen, resulting in lower operating costs. This system like other biologically operative ones has its limits in the short contact time; very high loading peaks show up again moderately in the effluent.
Published Version
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