Industrial Wastewater

A comparison of five industrial wastes shows that the SS content varies from 0.28 to 400 lb per unit of production (Eckenfelder 1966). The majority (65 to 75%) of non-polymeric chemical substances are soluble in water at 25°C

FIG. 7.47.2 Continuous RDVF. A, Coil filter; B, Belt filter. Sizes range to 550 ft2 per unit. Legend: a, filter medium (coil or cloth); b, filter drum; c, cake discharge; d, slurry vat; e, agitator; f, slurry level; g, filter valve; h, drying air outlet; i, filtrate outlet; j, vat drain; k, belt wash drain.

FIG. 7.47.2 Continuous RDVF. A, Coil filter; B, Belt filter. Sizes range to 550 ft2 per unit. Legend: a, filter medium (coil or cloth); b, filter drum; c, cake discharge; d, slurry vat; e, agitator; f, slurry level; g, filter valve; h, drying air outlet; i, filtrate outlet; j, vat drain; k, belt wash drain.

FIG. 7.47.3 Deep-bed filter with intermittent backwash. Water supply for backwashing occupies the upper part of the filter tank. When the drop across the filter reaches 4 ft of water, an air scour blows through the bed, carrying collected matter from the media. Then, the stored water flows through the bed in reverse, leaving the sand and anthracite clean.

FIG. 7.47.3 Deep-bed filter with intermittent backwash. Water supply for backwashing occupies the upper part of the filter tank. When the drop across the filter reaches 4 ft of water, an air scour blows through the bed, carrying collected matter from the media. Then, the stored water flows through the bed in reverse, leaving the sand and anthracite clean.

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