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Study on Impact of Dynamic Distribution of Floc Particles on Flocculation Efficiency in Water

Author: SongXinXin
Tutor: NanJun
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Turbidity Particle counting Flocculation effect Particle size distribution Flocculation baseline fluctuations
CLC: R123
Type: Master's thesis
Year: 2009
Downloads: 111
Quote: 3
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Abstract


The suspended particulate matter is a major water treatment remove the object, in the handling and use of process water, particulate matter the number, shape and characteristics will change. In water treatment process, often using the flocculated turbidity removal liquid separation even when the colloidal particles in the water and tiny suspended solids and other impurities in the coagulation pharmaceutical effect aggregation, and then removed by precipitation process. Essentially, the flocculation method is designed for changing the water suspended particle size distribution of suspended particles in water, i.e. prompted by the smaller particle size, and larger quantities gradually evolved into a larger particle size, a small number of state, precipitation and filtration The process can only remove the suspended particles of a certain particle size range. Turbidity is the concentration of suspended particles in the water, the size, shape, color and surface characteristics of various factors, such as light generated by the various effects of an integrated optical properties metric; particle count is the direct determination of the number and size distribution of the suspended particles in the water, both detection The principle differences cause turbidity and total number of particles in a certain range poor correlation. Provides an effective means of monitoring the emergence of particle counting instrument for the study of the dynamic distribution of floc particle size. The particle counter as turbiditor a useful supplement, both associated with effectively characterize the effect of water treatment, to ensure the safety of water supply. The topic particle counting technology to study the impact of water containing suspended solids and colloidal particles of impurities such as number, size distribution characteristics of turbidity change law as the main means of detection. The results show that the particulate matter in the water having uneven or multi-dispersibility, and the different effects of different size particles of turbidity, in most cases, the water contained in the steady-state microparticles vivid manifestation is difficult by the haze value, while the particle counting instrument The direct counting and determining the size of the particulate matter, it is a more comprehensive manner provides information about Suspended Particulate Matter characteristics, from the details provided the microscopic properties of the suspended particles in the water system. Were used particle counting method and image flocculation effect on the physical properties of the different hydraulic and water quality conditions floc size, quantity, and dispersion pilot study found that floc behavior of the solid-liquid separation in water treatment The flocs distribution are closely related. Proposed the flocculation baseline fluctuations in the value of this new concept, test results show that the: flocculation baseline fluctuations in the value of as valid indicators reflect the flocculation process of particle aggregation (flocculation) state, under different water conditions and residual turbidity based on the the floc distribution of pulsation phenomenon between both have good correlation can reflect changes in the flocculation effect. And by the fractal theory introduced to the floc particle size distribution law of the research found that, using particle size shaped dimensional number this characteristic indicators can achieve different flocculation reaction conditions, the formation of floc particle size distribution influence the flocculation effect of quantitative description, with The water in the sink after less than 5μm good correlation exists between the number of particles. Indicators associated with the characteristics of the the flocculation baseline fluctuations in value and size fractal dimension, optimize flocculation conditions not only in the production run of the actual water treatment processes and improve the flocculation effect can also be targeted to reduce the steady state the number of micro particles in treated water to eliminate The safety of urban water supply and water quality hazards.

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CLC: > Medicine, health > Preventive Medicine,Health > Environmental health,environmental medicine > Water and water supply sanitation
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