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Removing Humic Acid in Water by the Integrated Processes of Micro-eddy Flocculation (MEF)-counter Current Dissolved Air Flotation (CCDAF)-nanofiltration (NF)

Author: LouMin
Tutor: LiaoBaiHan;WangYiLi
School: Hunan Agricultural University
Course: Environmental Engineering
Keywords: Micro- eddy flocculation - countercurrent flotation - nanofiltration integration process Humic acid PAC (PAC) Polymerization ferric chloride (PFC) Process feature Dynamic operating characteristics
CLC: X52
Type: Master's thesis
Year: 2005
Downloads: 145
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Abstract


In water humic acids affect the water security and stability of organic matter, has become the focus of attention at home and abroad. In this thesis, the process characteristics and the effect of the removal of humic acid polyaluminum chloride (PAC) and polymerization the micro vortex as flocculant flocculation of ferric chloride (PFC) - countercurrent the flotation - nanofiltration integrated process, The micro-eddy flocculation - the countercurrent air flotation - nanofiltration integrated process to remove humic acid in water craft dynamic running characteristics. The main results are as follows: 1. Flocculant micro-eddy flocculation - the countercurrent air flotation process polyaluminum chloride (PAC) and polymerization of ferric chloride (PFC) Removal of humic acid, the optimal dosage, effluent are in compliance with the requirements of the pre-processing unit of the nanofiltration system, but the process requires the amount of flocculant. The pretreatment system and nanofiltration system integration process of the combination of humic acid in water concentration of organic matter greatly reduce, containing Q5633-type nanofiltration membrane processes than the containing the M-N1812A type nanofiltration membrane process effect. Polyaluminum chloride (PAC) 1.213 ~ 1.780mgL -1 for the former water flocculant TOC value dropped to 0.243 ~ 0.473mg L -1 , COD < sub> Mn values ?? 1.13 ~ 1.20 mg L -1 dropped to 0.57 ~ 0.77 mg L -1 UV 254nm values down to 0 to 0.0033 from 0.017 to 0.013; latter effluent TOC values ??only decreased to 1.0mg L -1 , COD Mn values ??down to about 0.82-0.92mg L -1 , UV 254nm value dropped to 0.008 to 0.012. Polymerization ferric chloride (PFC) flocculant former water UV 254nm value from 0.003 to 0.033 to 0, the TOC values ??from 1.190-1.411 to mg L -1 dropped to 0.418 to 0.554mg L -1 of COD Mn value of 1.14 ~~ 1.49 mg L -1 dropped 0.60 ~ 0.69mg L < sup> -1 ; latter effluent UV 254nm values ??only down to 0 ~ 0.011 the TOC value dropped to 0.932 ~ 1.0 mg L -1 , COD Mn values ??dropped to 0.95 ~ 1.2mg L -1 . Q5633-type nanofiltration membrane processes the desalination rate more than 95%, the containing the M-N1812A type nanofiltration membrane processes desalination rate is very low. Obtain drinking water purposes of view, therefore, the process 4 is the best choice; while to look for the purpose from the maximum amount of organic removal, the process 3 is the optimal choice. In addition, despite the security filter / activated carbon pretreatment is conducive to the improvement of the water quality of the nanofiltration membrane, but some kind of activated carbon columns and nanofiltration membranes can remove organics coincidence. The particle size distribution of the particles in the water, polyaluminum chloride (PAC) as a flocculant flocculation the gas surfaced after the median diameter of the particle size distribution of the particles in the water (d 50 ) 10 ~ 14μm and 8 to 13μm; polymerization ferric chloride (PFC) flocculant flocculation the gas surfaced after the median diameter (d 50 ) were 21μm and 16μm particle size distribution of the particles in the water. Security filters or security filter / activated carbon column, the particulate matter in the water samples d 50 0 to several μm. After nanofiltration membrane effluent particulate matter. 2. Determine the running period of 72 hours, through the micro-eddy flocculation - countercurrent flotation - the nanofiltration integrated process

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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