Particle size distribution and removal by a chemical-biological flocculation process

2007 ◽  
Vol 19 (5) ◽  
pp. 559-563 ◽  
Author(s):  
Zhi-bin ZHANG ◽  
Jian-fu ZHAO ◽  
Si-qing XIA ◽  
Chang-qing LIU ◽  
Xing-sheng KANG
2013 ◽  
Vol 779-780 ◽  
pp. 1482-1489 ◽  
Author(s):  
Jian Liu ◽  
Min Zhou ◽  
Jian Hao Zhou ◽  
Qi Chao Hu ◽  
Jun Guo He

The dynamics of flocculation is always one of the most interesting and difficult points for water treatment. The applicability of existing breakage rate coefficients was restricted due to the limitations of their theoretical derivation. In order to solve this problem, a breakage rate coefficient of flocculation process was derived based on shear strength. It could be described by the equation "s(m)=E0Fr1.2m1/D". Then it was applied to a flocculation model which described the change of particle size distribution during flocculation. Laboratory scale experiments were carried out to verify the feasibility of the new breakage rate coefficient with the typical surface water in northwest China characterized by low temperature and low turbidity. Results indicated that both the change of particle size distribution with time and the effects of operation variables on the stable particle size distribution could be excellently simulated, agreeing well with the experimental results with the relative error ranged from 3% ~ 17%. It was demonstrated that the breakage rate coefficient based on shear strength could be used to describe the breakage rate of flocs during flocculation.


Revista DAE ◽  
2019 ◽  
Vol 221 (68) ◽  
pp. 12-19
Author(s):  
Yuri Cardoso Mendes ◽  
Luan Serafim Mendes Gonçalves ◽  
Ricardo Henrique de Andrade Dutra ◽  
Rodrigo Braga Moruzzi ◽  
André Luiz de Oliveira

Neste trabalho foi investigada a evolução da distribuição de tamanho de partículas no processo de floculação por meio de duas funções de distribuição contínuas distintas. A coagulação e a floculação foram estudadas em escala de bancada usando como coagulantes o sulfato de alumínio, cloreto férrico e cloreto de polialu- mínio, sob diferentes gradientes de velocidade médios e tempos de floculação. O acompanhamento do pro- cesso foi feito por meio de aquisição e análise de imagens dos flocos obtidos para cada coagulante em cada gradiente médio de floculação nos tempos de floculação de 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 30, 40, 50 e 60 minutos. Os resultados apresentados permitem concluir que o parâmetro ajustável da função Gama pode ser usado no acompanhamento da evolução da distribuição de tamanho de partícula e, a exemplo do parâmetro β, pode ser empregado em futuros estudos de modelagem do processo de floculação. The evolution of the particle size distribution in flocculation process was performed by two different distribution functions. Coagulation and flocculation studies were develop in bath essays using aluminum sulfate, ferric chloride and polyaluminium chloride under different velocity gradients and flocculation times. Image analysis was applied to monitoring the process in each one of the velocity gradient at the flocculation times of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 30, 40, 50 and 60 minutes. The results presented showed that the adjustable parameter of the Gamma function can be used to follow the evolution of the particle size distribution and, like the parameter β, can be used in future modeling studies of the flocculation process.


2020 ◽  
Vol 69 (4) ◽  
pp. 102-106
Author(s):  
Shota Ohki ◽  
Shingo Mineta ◽  
Mamoru Mizunuma ◽  
Soichi Oka ◽  
Masayuki Tsuda

1995 ◽  
Vol 5 (1) ◽  
pp. 75-87 ◽  
Author(s):  
Christine M. Woodall ◽  
James E. Peters ◽  
Richard O. Buckius

1998 ◽  
Vol 84 (5) ◽  
pp. 387-392 ◽  
Author(s):  
Takashi INOUE ◽  
Yuzo HOSOI ◽  
Koe NAKAJIMA ◽  
Hiroyuki TAKENAKA ◽  
Tomonori HANYUDA

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