Method for removing low-concentration heavy metal in waste water by sludge absorption

A method for removing low-concentration heavy metal in waste water by sludge absorption relates to an isolation technology of heavy metal in waste water. Waste water and sludge of sewage factories are dried at the temperature of 45 to 60 DEG C, crushed to below 0.45 mm, mixed and reacted with low-co...

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Bibliographische Detailangaben
Hauptverfasser:	HE PINJING, WU JUN, YAO QIAN, ZHANG HUA, SHAO LIMING
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	A method for removing low-concentration heavy metal in waste water by sludge absorption relates to an isolation technology of heavy metal in waste water. Waste water and sludge of sewage factories are dried at the temperature of 45 to 60 DEG C, crushed to below 0.45 mm, mixed and reacted with low-concentration heavy metal waste water, and the pH is controlled between 3 to 6. After solid-liquid separation, the heavy metal in waste water is purified. The surface radicals of sludge has absorption ability for heavy metal and the remaining sludge of city sewage factories is selected as non-living biomass absorbent to treat waste water so that the method has the advantages of low cost, wide source, simple device, convenient operation and few secondary pollution. The method is particularly applicable to treatment of large-capacity and low-construction heavy metal in waste water, and also can be used for isolating heavy metal as pretreatment working procedure of various biological water treatment technologies. The wa