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Treatment of the Water from Reservoirs of Yellow River Using the Combination Processes of Coagulation and Adsorption

Author: ZhanXiao
Tutor: GaoBaoYu
School: Shandong University
Course: Environmental Engineering
Keywords: Coagulation Adsorption Yellow River reservoir water Floc characteristics Chlorination
CLC: TU991.2
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


In recent years, the increasingly serious water pollution in the Yellow River Basin. For effective removal of organic matter in the water of the Yellow River reservoir especially disinfection byproducts (DBPs) precursors, to protect the safety of drinking water, the paper selected polymerization ferric chloride (PFC) and polyaluminum chloride (PAC) inorganic polymer coagulation agent, the study of the water of the Yellow River reservoir enhanced coagulation treatment effect, at the same time explore the the floc characteristics coagulation process and the production of DBPs trend. Selection of powdered activated carbon and modified wheat straw the adsorbent and coagulation processes associated with visits combined with treatment of the process water of the Yellow River reservoir and disinfection effect. The main conclusions are as follows: (1) PFC and PAC handling the Yellow River reservoir water, organic matter and turbidity removal efficiency with the increase of coagulant dosage increased; However, the high dosage of PAC turbidity removal rate decreased slightly. Under alkaline conditions, is conducive to the removal of the turbidity at pH 6, coagulation and removal of organic matter is better; PAC coagulation process, the dominant electricity; PFC coagulation process, adsorption bridges and electricity and at the same time play a role. (2) in the low dosage (PFC dosage of 3 mg / LPAC dosage of 1 mg / L), floc growth is slower, and not generated in the coagulation stage has a stable particle size of floc body. Flocs in high dosage has a rapid growth rate, but smaller PAC generated floc size. the pH value of the PFC floc growth rate and particle size; PAC floc growth rate and particle size is more obvious. (3) low PFC dosage (3 mg / L), floc strength factor and recovery factor. PAC dosage was 20mg / L, the floc strength factor. Under different pH conditions, regardless of the dosing PFC PAC, floc strength factor with the increase of the pH value decreased slightly; recovery factor increased slightly with the increase of the pH value. (4) in the raw water conditions floc, of PFC generated flocs PAC generated dense. PFC generated flocs with increasing dosage, floc fractal dimension gradually reduce; floc generated by the PAC in the lower and higher dosage, looser flocs. With the increase of the pH value, the fractal dimension of the floc significantly increased. (5) the use of PFC coagulation dosing largest when the final free residual chlorine content of up to a total chlorine demand at least, disinfection byproducts generated the smallest trend; using PAC coagulation dosage amount of 12 mg / L minimum, the end of free residual chlorine content of up to disinfection byproducts trend. This is consistent with the effluent DOC removal rate. (6) Coagulation - adsorption of the integration process of the water samples, the removal rate of increase as coagulant and adsorbent dosage increased first dosing the adsorbents can improve the settling characteristics of the floc. And associated with the processing of final free residual chlorine content of more, you can maintain continuous disinfection effect. And after the first adsorption, coagulation, adsorption advantages in maintaining the disinfection effect than the first coagulation.

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