Evaluation of simultaneous nutrient removal and sludge reduction using laboratory scale sequencing batch reactors.
نویسندگان
چکیده
The treatment and disposal of excess sludge has been a rising challenge for wastewater treatment plants worldwide. In this study, simultaneous sludge reduction and nutrient removal was evaluated in laboratory scale sequencing batch reactors (SBRs). Two SBRs were operated alongside for a duration of 370d. One SBR was operated to achieve nutrient removal (control-SBR) at 10d solids retention time (SRT), while the other (modified-SBR) was operated to achieve nutrient removal along with sludge reduction. Sludge reduction in the modified-SBR was accomplished by subjecting the recycled biomass to feasting and fasting at sufficiently high SRT close to infinity (phase I and II) and finite SRT (phase III). The observed biomass yield in the modified-SBR was estimated to be 0.17mg TSSmg(-1) COD, representing 63% sludge reduction compared to the control-SBR. The NH(3) levels in the effluents from both SBRs always remained below detection limit. The average dissolved phosphorus removal efficiencies in the control-SBR and the modified-SBR were 87% and 84%, respectively, during phase II. However, the biomass of the modified-SBR increased during phase II. To control this, biomass wastage was initiated directly from the modified-SBR during phase III at a rate equivalent to the observed biomass accumulation rate in the system in phase II. This resulted in an overall 100d SRT for the modified-SBR system. Following this change, biomass accumulation in the modified-SBR was controlled, and a net 63% sludge reduction could be sustained along with 90% phosphorus and 100% NH3 removal. Consistent denitrification activities were also noticed in both SBRs despite the absence of any carbon source during the anoxic phase of every cycle.
منابع مشابه
A Comparative Study on Performance of Two Aerobic Sequencing Batch Reactors with Flocculated and Granulated Sludge Treating an Industrial Estate Wastewater: Process Analysis and Modeling
In this study, the performance of two aerobic sequencing batch reactors (SBR) in removing carbon and nutrient (N & P) from Faraman’s industrial estate wastewater (FIW) with flocculated and granulated sludge were compared. The comparison study was performed by varying two significant independent variables (aeration time and mixed liquor volatile suspended solids (MLVSS)). The experiments were co...
متن کاملSimultaneous COD, nitrogen, and phosphate removal by aerobic granular sludge.
Aerobic granular sludge technology offers a possibility to design compact wastewater treatment plants based on simultaneous chemical oxygen demand (COD), nitrogen and phosphate removal in one sequencing batch reactor. In earlier studies, it was shown that aerobic granules, cultivated with an aerobic pulse-feeding pattern, were not stable at low dissolved oxygen concentrations. Selection for slo...
متن کاملEvaluation of the Performance of Advanced Sequencing Batch Reactor Biological Processes in the Removal of Nutrients from Municipal Wastewater in Yazd City: A Case Study
Background and Objectives: Advanced Sequencing batch reactors (SBR) are one of the most suitable modified activated sludge systems. Due to low cost, optimal efficiency, and easy operation, they are recognized as an effective biological treatment system. The purpose of this study was to determine the performance of the SBR biological process in the removal of organic matter and nutrients from Ya...
متن کاملMulti-scale individual-based model of microbial and bioconversion dynamics in aerobic granular sludge.
Aerobic granular sludge is a novel compact biological wastewater treatment technology for integrated removal of COD (chemical oxygen demand), nitrogen, and phosphate charges. We present here a multiscale model of aerobic granular sludge sequencing batch reactors (GSBR) describing the complex dynamics of populations and nutrient removal. The macro scale describes bulk concentrations and effluent...
متن کاملComparison of technical and economic efficiency of extended aeration and sequencing batch reactors processes in hospital wastewater treatment
Wastewater of hospitals can cause many risks to public health due to having a variety of pathogenic microorganisms, pharmaceutical substances, and other hazardous toxic substances. The aim of this study was to evaluate the chemical quality of effluents from wastewater treatment plant of Falsafi Hospital and Hakim Jorjani Hospital in Gorgan, Iran, and to compare them technically and economically...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Chemosphere
دوره 76 5 شماره
صفحات -
تاریخ انتشار 2009