Jun 13, 2019 · The ideal temperature for getting the most out of the THC in marijuana, while also avoiding the toxins from the smoke is around 350°F up to 420°F. After 420°, combustion begins so in effect the marijuana gets smoked rather than vaped, which should be avoided.
This study investigates the effect of temperature and thermal history in the range of 50-80°C for 1 h on the rheology and composition of digested sludge and waste activated sludge (WAS). The range of temperature and time were selected 50-80°C and 1-60 min, firstly,
Mar 24, 2014 · The physical-chemical properties of activated sludge, such as flocculating ability, hydrophobicity, surface charge, settleability, dewaterability and bacteria extracellular polymer substances (EPS), play vital roles in the normal operation of wastewater treatment plants (WWTPs). The nanoparticles released from commercial products will enter WWTPs and can induce potential adverse effects on ...
The Effects and Processes for Removal of Chromium in Activated Sludge Treatment Author: Andrew Merical Last modified by: Jenny Created Date: 11/20/2007 8:57:25 PM Document presentation format: On-screen Show Company: Hewlett-Packard Company Other titles
affect the rate of degradation, this study measured the breakdown rates of six PPCPs — four NSAIDs (naproxen, ketoprofen, fenoprofen and diclofenac), carbamazepine, and triclosan — by activated sludge systems. They compared the degradation rate of the PPCPs in sludge collected from four WWTPs in Denmark, each representing a different design.
Title: Effect of Temperature, Dry Solids and C/N Ratio on Vermicomposting of Waste Activated Sludge Author: K. Naddafi, M. Zamanzadeh , A. A. Azimi , G. A. Omrani , A ...
Activated sludge bulking is easily caused in winter, resulting in adverse effects on effluent treatment and management of wastewater treatment plants. In this study, activated sludge samples were collected from different wastewater treatment plants in the northern Xinjiang Uygur Autonomous Region of China in winter.
Activated sludge has pseudoplastic properties indicating the presence of thixotrophic behavior (Moeller, Torres, 1997, Mori et al., 2006, Pham et al., 2009). One can also find numerous contradictory opinions proving that activated sludge has both Newtonian and non Newtonian properties. The presence of hysteresis on flow Dec 23, 2014 · Abstract: Activated carbon (AC) was added into the activated sludge to alleviate membrane fouling during sludge microfiltration. The fouling mitigation profiles were evaluated at different AC sizes and doses by a single-fibre microfiltration system.
What is claimed is: 1. The method of treating an activated sludge from a municipal or a pulping operating or combination thereof, comprising the steps of acidifying the sludge to a pH below about 2.2, heating the acidified sludge to a temperature of from about 150°-210° F. and maintaining the sludge at such conditions for a period of time sufficient to obtain a settling rate of solids in the ...
temperature-rate relationships for activated sludge systems in general. I The activated sludge process is basically a biological I process; and biological processes are known to be temperature dependent. In a completely mixed activated sludge (CMAS) system, temperature is known to affect the growth kinetics •
Temperature effects on activated sludge systems have .$ received little attention in the past, probably because of | the lack of an inexpensive method for changing or controlling ^ wastewater temperatures. Most of literature dealing with | design or simulation studies characterizes temperature _ effects on the substrate removal rate for an ...
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@article{osti_22089895, title = {Pilot-scale anaerobic co-digestion of municipal biomass waste and waste activated sludge in China: Effect of organic loading rate}, author = {Liu Xiao, E-mail: [email protected] and Wei, Wang and Yunchun, Shi and Lei, Zheng and Xingbao, Gao and Wei, Qiao and Yingjun, Zhou}, abstractNote = {Highlights: Black-Right-Pointing-Pointer Co-digestion of ... May 06, 2020 · Table 3 shows the effects of different pretreatments on the solubility of organic matter in waste activated sludge. A significant increase in COD solubility in all treated samples was observed compared to the controls, varying from 3.65 to 30.37%.
Thus the temperature rise during curing of light activated resin restoratives is related to both polymerisation exotherm of the material and heat output from the light curing unit. Comparison of pulp temperature changes during restoration of primary teeth with resin
However we include this temperature influence in our model based design and operation of both advanced activated sludge (AAS) based and high-rate anaerobic digestion (HRAD, mesophilic and ...
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Aug 17, 2017 · An activated sludge system consists of one or more reactors, in which microorganisms responsible for treatment are kept in suspension and a solid-liquid separation is performed in a secondary clarifier that follows the activated sludge process or by membrane filtration.
The presence of bacteria is vital for the wastewater treatment process. In an ideal wastewater treatment plant system, bacteria (about 95%) along with a small portion of fungi and protozoa should form a biological floc that is known as an activated sludge.
conventional activated sludge systems. The unit processes of the SBR and conventional activated sludge systems are the same. A 1983 U.S. EPA report, summarized this by stating that “the SBR is no more than an activated sludge system which operates in time rather than in space.” The difference between the two technologies is that the
Abstract: The effect of temperature, dry solids and C/N ratio on the growth of E. fetida and on vermicomposting of waste activated sludge was studied in a small-scale laboratory experiments. The maximum growth rate in 25°C, 15-20% dry solids and a C/N ratio of 15 were 19±1, 21±2 and 20±2 mg/worm/day, respectively.
Activated Sludge Process. IWA Publishing . Activated sludge (AS) is a process dealing with the treatment of sewage and industrial wastewaters and developed around 1912-1914. o There is a large variety of design, however, in principle all AS consist of three main components: an aeration tank, which serves as bio reactor;
Measurement of Temperature Effects on Oxygen Uptake Rate in Activated Sludge Treatment By Gautam Chalasani Weimin Sun Submitted in partial fulfillment Of the requirements of the course: ENE 806 To Dr. Syed A. Hashsham, Ph.D. Edwin Willits Associate Professor Michigan State University College of Engineering
Oily materials introduced into an activated sludge system are almost immediately absorbed on the biological floe. (Page 57) 2. Excessive amounts of oily materials interfere with the performance of an activated sludge system by lowering the den- sity of the floe to the level where the sludge settling pro- perties are destroyed. (Pages 55-57) 3.
Oct 01, 2020 · Both thermophilic AD and the heat pretreatment of waste activated sludge were demonstrated to be favorable for increasing the activities of hydrolases (Kim et al., 2012, Liu et al., 2019). Hence, the temperature effect on eARGs variations during AD is worth studying.
Low temperature thermo-chemical pretreatment of dairy waste activated sludge for anaerobic digestion process. Bioresource Technology 103(1): 415-424, 2012. Evaluation of anaerobic digestion of food waste and waste activated sludge: Soluble COD versus its chemical composition. Science of the Total Environment 643: 21-27, 2018
Activated sludge is an enrichment culture of micro and macro organisms that remove (or change) components considered to be pollutants.
Join us for a free, 30-minute webinar where Hydromantis modelling specialists will discuss and demonstrate how temperature affects the activated sludge proce...
Sludge sample Activated sludge sample was collected from municipal wastewater treatment plant in Tokyo, Japan, on October 1, 2013. This plant employs a conventional activated sludge process. Water temperature and pH in the aeration tank at sampling were 22.6℃ and 6.6, respectively. The mixed liquor suspended solid (MLSS) concentration
II. Bio-Tiger Model Activated Sludge Input Data An example of the activated sludge input data for the model is provided below: Activated Sludge Input Data Temperature (°C) 20 S o (mg/L CBOD5) 142 Volume of reactor (mil gal) 0.98 Influent flow rate, Q (mgd) 2.85 Inert VSS (mg/L) 40 Oxidizable N (mg/L) 25 biomass (VSS/TSS) 0.85 Influent TSS (mg ...
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The highest content of intracellular proteins in the activated sludge was 87.8 mg/g VSS, obtained at 20°C, 8 mg/L of DO and a SRT of 6 days. The highest content of intracellular polysaccharides in the activated sludge was 76.6 mg/g VSS, which was achieved at 20°C, a SRT of 6 days and a wide range of DO.
Apr 16, 2010 · wastewater. The activated sludge process is an alternative method to treat high strength ammonia wastewater. In this project, the effect of temperature and the nitrification performances in treating ammonia wastewater by immobilized activated sludge in both batch culture and continuous mode methods were examined.
To recover a preferred carbon source from waste activated sludge (WAS), this study systematically investigated the effects of a low-temperature thermal hydrolysis process (THP) on WAS solubilization and dewaterability at 25°C–120°C for 60 min. Experimental results indicated that organics [soluble chemical oxygen demand (SCOD), proteins, carbohydrates, and lipids] and nutrients (N and P) were efficiently released into the sludge supernatant after THP.
Using two kinds of EBPR (enhanced biological phosphorus removal) activated sludge, we made aerobic batch studies to know temperature effects on PHA (polyhydroxyalkanoate) degradation and P (phosphorus) uptake. The activated sludges used were grown in two EBPR systems fed with wastewater of different P/C ratios. The one sludge had a P content of 13-14 % in P/MLSS ratio, and the other 5-6 %.
Changes in temperature, pH, DO, sludge age, or even the amounts of available nutrients such as nitrogen, phosphorus, oils & grease can affect these bacteria. The dominance of filamentous bacteria in the activated sludge treatment system can cause problems with sludge settling.
Oct 16, 2004 · Effects of Nais elinguis on the performance of an activated sludge plant Effects of Nais elinguis on the performance of an activated sludge plant Ratsak, Christa 2004-10-16 00:00:00 The oligochaete worm Nais elinguis was counted during a year and a half in a full-scale, completely mixed, mu- nicipal activated sludge plant consisting of four aeration tanks connected in parallel.
The activated sludge was collected from the secondary treatment tanks of a WWTP Ostrava – Privoz and WWTP Hermanice II. It was kept aerated during transit to the laboratory, using a portable 12V aeration device. In the laboratory, 600 ml of the activated sludge was placed into the stock flask. In the stock flask the sludge was maintained at a
Activated sludge has pseudoplastic properties indicating the presence of thixotrophic behavior (Moeller, Torres, 1997, Mori et al., 2006, Pham et al., 2009). One can also find numerous contradictory opinions proving that activated sludge has both Newtonian and non Newtonian properties. The presence of hysteresis on flow
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Nov 25, 2013 · Muller E, Schade M, Lemmer H: Filamentous scum bacteria in activated sludge plants: detection and identification quality by conventional activated sludge microscopy versus fluorescence in situ hybridization. Water Environ Res 2007, 79: 2274–2286. 10.2175/106143007X183943. Article Google Scholar Download references
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