Metal removal in activated sludge: the role of bacterial extracellular polymers

Developing Human Health-related Chemical Guidelines for Reclaimed Waster and Sewage Sludge Applications in Agriculture

Significance and behaviour of heavy metals in waste water treatment processes I. Sewage treatment and effluent discharge

Impact of high-strength wastewater infiltration on groundwater quality and drinking water supply: the case of Sana'a, Yemen

Sediment analysis is used for detecting pollution sources; in addition, sediments are increasingly investigated as a pollution proper and as a carrier and possible source of contaminants in aquatic systems. Amongst the various groups of pollutants which possess a strong affinity to sedimentary materials, heavy metals and polycyclic aromatic hydrocarbons present the greatest environmental hazard. A review is given of pre-civilisational concentrations (“background” values) of both heavy metals and polycyclic aromatic hydrocarbons in fluviatile sediments, and their development during the past 100 years. The impact of sediment associated heavy metal pollution on both biota and water is discussed.

Concentrations of heavy metals and polycyclic aromatic hydrocarbons in river sediments: geochemical background, man's influence and environmental impact

were determined on a dry weight basis. These were in turn compared with par ticulates from many natural rivers, urban ized storm drainage, and background nat ural sediment to provide quantitative data for evaluating the possible ecological con sequences of various discharges. Galloway3 studied the trace metal con centrations in the area of the outfalls of major discharges in Southern California and found that the average enrichment ratios (the concentration factors relative to the natural concentration of the metal in the sediment for each outfall region) range from as high as 70 for mercury to almost unity for iron, manganese, and nickel. The ratios of other trace metals were scattered in between. These concen trations are not excessively high in com parison with the several hundred enrich ment factors in manganese modules 4 and, to a lesser degree, with the enrichment fac tor of the organic-rich continental shelf.5 Changes are known to occur in the trace metal contents of suspended particulates when they enter the ocean; thus the con centrations in dry weight residues will provide the upper limit of the trace metal contents around the outfall. Because some of the trace metals associated with par ticulates may desorb in the presence of the high concentration of chloride ion in sea water, the actual enrichment factor might well be below that predicted from the determinations of discharge residues.

https://www.jstor.org/stable/info/25038327

Rohatgi N

Papers

Trace metals in wastewater effluents