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Sulfuric Acid Burning Slag Flocculant Prepared PPFS and Application in Wastewater Treatment

Author: LiDeMing
Tutor: PengShuChuan
School: Hefei University of Technology
Course: Environmental Engineering
Keywords: Sulfuric acid residue Poly Ferric Sulfate Polyphosphate ferric sulfate Flocculation
CLC: X703.5
Type: Master's thesis
Year: 2010
Downloads: 67
Quote: 2
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Abstract


Sulfuric acid residue from sulfuric acid burn slag recovery and utilization began to discuss the hazards of sulfuric acid residue research cinder Utilization , and on this basis , to carry out the preparation of flocculants in wastewater treatment research . Reduction roasting sulfuric acid residue in a certain chemical reaction conditions , restore the trivalent iron ions (Fe 3 ) of divalent iron ions ( Fe , 2 ) with sulfuric acid precipitation of the divalent iron ion to give a solution of ferrous sulfate (FeSO 4 ), under the action of the catalyst , by oxidation, hydrolysis and polymerization to obtain a polyferric sulfate ( PFS ) . This paper focuses on the optimal experimental conditions : calcination temperature of 850 ° C ; roasting time 25 min ; the reductant amount of 80 % WT ; the acid leaching Time 25min ; acid leaching temperature of 70 ° C ; the excess coefficient sulfate 1.2 ; sulfuric acid concentration of acid leaching little effect on PFS ( liquid) to reach the national standard level . Homemade PFS based on PFS modified to obtain a more flocculant flocculation effect . In this paper, by introducing the phosphate ion ( PO 4 3 < / sup >) , improvement of PFS prepared poly ferric sulfate ( PPFS ) . Since the role of bridge health , polyphosphate ferric sulfate to more than polymeric ferric sulfate flocculation . This article by configuring turbidity 70.3NTU made ​​watery , water samples 400mL beaker , and the beaker is placed in a stirrer , stir after adding a certain amount PPFS first rapid stirring (100 rpm ) 1min , then slow (60rpm) was stirred for 5min, remove supernatant water samples , the best flocculation experimental conditions : the flocculation time 60 min ; flocculant dosage of 10 mg / L and the pH range 6-9 . Polyphosphate ferric sulfate to deal with city sewage water samples 500mL, studies flocculant dosage on COD, turbidity , NH3 -N , TP , SS , and find out the best dosage of 6.0mL. And by comparing the effect of modified polymeric ferric sulfate is used to treat wastewater better than other flocculants .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Additives
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