Preparation method of modified limestone filler used for sewage purification

• Main Authors: LIN YING, XU CANCAN, SI CHUNCAN, XUE YONGLAI, SUN XIANCHAO, HONG XIA, DU DAOLIN, XIAO XIANG, DAI ZHICONG
• Format: Patent
• Language: Chinese; English
• Published: 07.11.2012
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a preparation method of a modified limestone filler used for sewage purification, which belongs to a preparation method of a sewage treatment filler in the field of environmental protection. The preparation method comprises the following steps of: crushing a raw material of limestone; screening the raw material; grinding and processing the raw material into irregular particles; processing the irregular particles into particles with a required size; modifying the particles by using ionic liquid containing low-concentration lanthanide rare-earth elements; soaking the modified particles at normal temperature for 4 to 24 hours; and drying the particles to obtain a finished product. The modified limestone filler is low in raw material cost, simple in processing technique and good in using effect. The modified limestone filler can be widely applied to a trickling filter bed, an anaerobic biological filter, a filtering tank, a biological fluidized bed, an aeration biological filter, a high lo