Bleach Blindness

Hazard Vesicant war gas, causes conjunctivitis and blindness. Can be decontaminated by chloroamines or bleaching powder. Vapor is extremely poisonous and can be absorbed via skin. 

Several indicators are utilized to determine the point at which the filter space is filled with solids from the bleached oil when the pressure drop across the leaves reaches a predetermined level, when a predetermined decrease in flow rate occurs, or when a calculated load level is reached. Short cycles or premature filter stoppages are usually the result of (i) inadequate body feed (ii) too high flow rate, which can cause the solids to pack (iii) too low flow rate, which can allow the solids to settle and block the flow rate (iv) blinded screens, which reduce the filter surface area or (v) solid load exceeding filter capacity. The perfect circumstance is when the differential pressure is reached, and the flow rate is severely reduced at the same time that the calculated filter capacity is exhausted. Once the filter cycle is complete, the filter cake must be removed and the process repeated all over again (Butterworth, 1978). 

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