The presence of various inorganic and organic substances in a digester can cause inhibition or toxicity. Heavy metals, light metal cations, oxygen, sulfides and ammonia are potential toxic materials. The best method of controlling digester toxicity is to prevent the toxic materials from entering the system. A strong industrial waste ordinance which is enforced is the ideal solution. The cause of toxicity should be identified. Temporary relief from toxicity may be achieved by: (I) increasing the mixing the dilute and disperse the toxic material;

(2) uniform feeding of sludges rather than slugs;

(3) decreasing the feed to the digester; (4) diluting the sludge; (5) pumping in an active seed sludge if the digester is only partially inhibited.

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