excess sludge minimization in conventional activated sludge pilot plant by three chemical matters
نویسندگان
چکیده
the excess sludge treatment and sludge disposal are major factors to the over-all economy of wastewater treatment plants (wwtp). the ideal solution to the problem of sludge disposal is to combine sludge minimization with contamination removal at the source. in this study, the effect of ozonation, chlorination and 3,3,4,5–tetrachlorosalicylanilide (tcs) to treat part of the return activated sludge flow with the intention of reducing the overall plant yield in a conventional activated sludge pilot, were investigated in a side-stream pilot reactor. it was found that in the case of ozonation 8% g o3/g mlss, and in the case of chlorination 2% g cl2/g mlss produce the best results. in the utilization of tcs method, the excess sludge production was reduced by 80% per day at a tcs dose of 1% g tcs/g mlss. in all the above experiments a reduction in the volume of the excess sludge was achieved, while the efficiency of removal chemical oxygen demand (cod) from the reactor without the use of those methods was not significantly different.
منابع مشابه
excess sludge minimization in conventional activated sludge pilot plant by three chemical matters
the excess sludge treatment and sludge disposal are major factors to the over-all economy of wastewater treatment plants (wwtp). the ideal solution to the problem of sludge disposal is to combine sludge minimization with contamination removal at the source. in this study, the effect of ozonation, chlorination and 3,3,4,5–tetrachlorosalicylanilide (tcs) to treat part of the return activated slu...
متن کاملNew approaches to minimize excess sludge in activated sludge systems.
This paper presents three new approaches to reduce excess sludge production in activated sludge systems: 1) modification of conventional activated sludge process with insertion of a sludge holding tank in the sludge return line; 2) chlorination of excess sludge so as to minimize excess sludge production; and 3) utilization of a metabolic uncoupler, 3, 3', 4', 5-Tetrachlorosalicylanilide (TCS) t...
متن کاملInvestigation of the Excess Sludge Reduction in SBR by Oxidizing Some Sludge by Ozone
The excessive biological sludge production is one of the disadvantages of aerobic process such as SBR. So the problem of excess sludge production along with its treatment , and disposal in aerobic processes in municipal and industrial waste water can be seen in many parts of the world even in our country . to solve the problem of excess sludge production , reducing in by oxidizing some of t...
متن کاملProgress in Hydrolysis of Excess Activated Sludge by Additional Enzymes
Additional enzymes pretreatment technology can promote the hydrolysis of excess activated sludge, while increasing gas production. Single enzyme pretreatment of sludge, alkaline protease has a better effect of hydrolysis. The optimum working conditions for alkaline protease: pH value of 8.0, the solid-liquid ratio of 1:4, the enzyme concentration of 2%, the working temperature of 55°C, reaction...
متن کاملMinimization of sludge production by a side-stream reactor under anoxic conditions in a pilot plant.
This study evaluates the application of an anoxic side-stream reactor in the sludge return line of a conventional activated sludge system for the reduction of biomass production. The oxidation-reduction potential was maintained at -150 mV while the applied sludge loading rate was modified by changing the percentage of return sludge treated in this reactor. The observed yield from the convention...
متن کاملRheological characterization of centrifuged thickened waste excess activated sludge (EAS): the maceration effect on sludge pumpability
The purpose of this study is to determine how the rheological characterization of centrifuged thickened waste excess activated sludge (EAS). Wastewater treatment plants (WWTP) contain a number of transport operations of suspensions with special flow characteristics. Flow characteristics, in particular viscosity related effects, vary from very water-like to strongly non-Newtonian. This study use...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
international journal of environmental researchجلد ۵، شماره ۴، صفحات ۹۸۱-۹۸۸
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023