This study evaluates the effectiveness of a lime coagulation, lime, and limesoda ash softening in the removal of lead. The treatment processes were simulated at laboratory scaie oh a variety of waters having synthetically developed Chemical characteristics. All Systems reduced lead levels to 0.05 mg/l; however, alum coagulation was effective only in the pH range 8–9, not at near neutral values. Chemical softening in the solids‐contact mode resulted in virtually complete removal of lead.
Increase in dietary cadmium as a result of application of sewage sludge to agricultural landThe maximum acceptable dietary intake of cadmium is 70 fig/day. The FDA estimate of cadmium in the median American diet is 39 fig/day, so a 30 fig/day increase in dietary cadmium would keep Cd ingestion within the limit.When sludges are applied to gardens and fields, an annual application limit of 0. 5 kg Cd/ha should protect public health
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.