BOD5 (mg/L) TSS (mg/L) FC (number/100 mL) Flow (mgd)
17 (5-30) 9 (2-27) <10 (<10-20) 0.309 (0.079-0.526)
deviated occasionally, up to a BOD5 of 40 mg/L and TSS of 50 mg/L; however, only 12 out of over 100 samples exceeded 30 mg/L in both BOD5 and TSS.
Saidam et al. (1995) performed a series of studies of rock filters treating lagoon effluent in Jordan. The filters were arranged in three trains. The first train consisted of two filters in series; the first filter contained rock with an average diameter of 7 in. (18 cm) and was followed by a filter containing local gravel with an average diameter of 4.6 in. (11.6 cm). The second train contained the same rock as used in the first filter, but the second filter contained rock with an average diameter of 1 in. (2.4 cm). Local gravel with an average diameter of 4.6 in. (11.6 cm) was used in the first filter of the third train, and the second filter contained an aggregate with an average diameter of 0.5 in. (1.27 cm). The filters in the three trains were operated in series. The characteristics of the wastewater, hydraulic loading rates, and effluents from the various filters are shown in Table 5.11. The removal efficiencies obtained in the first run for the various filters and the trains are summarized in Table 5.12. Even though the rock sizes and loading rates of several of the filters were similar to those at Veneta and West Monroe, the quality of the effluents was much lower.
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