scholarly journals Study on the emission characteristics and mechanism of sulfur-containing gas during sludge pyrolysis at low temperature

2021 ◽  
Author(s):  
Shuo Shang ◽  
Haihong Fan ◽  
Binbin Li ◽  
Lin Li ◽  
Zhou Li
Keyword(s):  
Emission Characteristics ◽  
Drying Process ◽  
Treatment Technology ◽  
Sludge Treatment ◽  
Effects Of Temperature ◽  
Sludge Drying ◽  
Temperature Time ◽  
Sulfur Containing ◽  
Addition Amount ◽  
Selection Of

Abstract The effects of temperature, time, and calcium-based ultrafine powder on sulfur-containing gas in the sludge drying process were examined through experiments, and effective measures to control the release of sulfur-containing gases such as CS2, H2S, and SO2 were proposed. Experimental results showed that the drying temperature of sludge should be controlled below 250°C, and the drying duration should be kept within 1 min. Additionally, the release amount of three gases released was small. When the addition amount of calcium-based powder added reached 20% of the original sludge mass fraction, the concentration of sulfur-containing gas released was 59.81 mg/m3, 94% lower than that of the dry pure sludge gas. After absorption by calcium-based powder, there are almost no sulfur-containing organic compounds and sulfur-containing gases. The research results provide a direction for the selection of pyrolysis sludge treatment technology, which is conducive to control the discharge of harmful gases.

Hong Kong Sludge Treatment Facilities

2010 ◽  
Vol 5 (2) ◽  
Author(s):  
Echo Leong ◽  
Alex Kwan ◽  
Priscilla Yuen
Keyword(s):  
Hong Kong ◽  
Sewage Treatment ◽  
Treatment Technology ◽  
Sludge Treatment ◽  
Sludge Disposal ◽  
Design Build ◽  
Treatment Facilities ◽  
Dewatered Sewage Sludge ◽  
Fluidized Bed Incineration ◽  
Selection Of

At present, all dewatered sewage sludge generated by sewage treatment works (STW) is disposed of at landfills. This current practice of sludge disposal at landfill is not sustainable from both environmental and technical perspectives. The Hong Kong sludge contains high content of chloride due to use of seawater flushing in most of the Hong Kong areas and Hong Kong is a densely populated city. This unique condition has limited its selection of the alternative sludge treatment technology. The Sludge Treatment Facilities (STF) adopting fluidized bed incineration technology is a sustainable alternative for sludge disposal in Hong Kong. The design capacity of the STF is 2000 wet tonnes per day. The STF will be implemented under a Design-Build-and-Operate contract arrangement with a contractual operation period of 15 years and is scheduled to be commissioned by 2012.

scholarly journals Effect of Temperature, Time, and Material Thickness on the Dehydration Process of Tomato

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
A. F. K. Correia ◽  
A. C. Loro ◽  
S. Zanatta ◽  
M. H. F. Spoto ◽  
T. M. F. S. Vieira
Keyword(s):  
Food Industry ◽  
Sample Thickness ◽  
Effect Of Temperature ◽  
Adiabatic Process ◽  
Processing Conditions ◽  
Drying Process ◽  
Surface Response Methodology ◽  
Effects Of Temperature ◽  
Drying Conditions ◽  
Temperature Time

This study aimed to evaluate the effects of temperature, time, and thickness of tomatoes fruits during adiabatic drying process. Dehydration, a simple and inexpensive process compared to other conservation methods, is widely used in the food industry in order to ensure a long shelf life for the product due to the low water activity. This study aimed to obtain the best processing conditions to avoid losses and keep product quality. Factorial design and surface response methodology were applied to fit predictive mathematical models. In the dehydration of tomatoes through the adiabatic process, temperature, time, and sample thickness, which greatly contribute to the physicochemical and sensory characteristics of the final product, were evaluated. The optimum drying conditions were 60°C with the lowest thickness level and shorter time.

Utilisation of energy from digester gas and sludge incineration at Hamburg's Köhlbrandhöft WWTP

2002 ◽  
Vol 46 (4-5) ◽  
pp. 397-403
Author(s):  
R.D. Thierbach ◽  
H. Hanssen
Keyword(s):  
Steam Turbine ◽  
Energy Supply ◽  
State Of The Art ◽  
External Heat ◽  
Drying Process ◽  
External Energy ◽  
Sludge Treatment ◽  
Anaerobic Digesters ◽  
Sludge Incineration ◽  
Sludge Drying

At Hamburg's Köhlbrandhöft WWTP the demand for external energy supply is minimised by state of the art sludge treatment. The sludge is subjected to thickening, anaerobic digestion, dewatering, drying and incineration. The digester gas is used in a combined gas and steam turbine process. The sludge incineration also produces steam, which is also used in the steam turbine that follows the gas turbine. The turbines produce electricity, partially expanded steam is used for the sludge drying process. Heat from the condensation of vapours from sludge drying is used to heat the anaerobic digesters. The overall process requires no external heat or fuel and produces 60% of the WWTP's electricity demand.

Analysis of Sewage Sludge Treatment Process Using Taguchi Method

2005 ◽  
Author(s):  
Joon Hwang ◽  
Woo-Jung Kang
Keyword(s):  
Sewage Sludge ◽  
Taguchi Method ◽  
Process Parameters ◽  
Particle Diameter ◽  
Cost Effective ◽  
Drying Process ◽  
Sludge Treatment ◽  
Process Operation ◽  
Sewage Sludge Treatment ◽  
Sludge Drying

This paper presents the experimental analysis of sewage sludge drying process using Taguchi method to know the characteristics and optimize drying process parameters. There have been attempt to perform the sewage sludge disposal such as simple reclaiming, dumping in the sea, incineration. Currently, these methods are restricted by national or international government regulations. The drying process is adopted as effective method for sewage sludge treatment, however sewage sludge makes difficult to treat with large volume at the real drying process plant because of its own complicated physical, chemical, and thermal properties. To treat the sewage sludge in view of environmental friendly and cost effective way, it is necessary to control the volume and weight of sewage sludge. It is not only reduces the delivery expenses and improve the re-usability, but also prevents several shift environmental pollution from nocuous sewage sludge. In this study, sewage sludge drying process parameter was modeled and evaluated with Taguchi method. From these research results the process parameters can be optimized to satisfy the desired qualities of particle diameter and moisture content of dried sewage sludge, and also provided to achieve the economic process operation.

EFFECTS OF TEMPERATURE-TIME COMBINATIONS ON DONENESS AND YIELDS OF WATER-COOKED BROILER THIGHS

1975 ◽  
Vol 40 (1) ◽  
pp. 129-132 ◽  
Author(s):  
C. E. LYON ◽  
B. G. LYON ◽  
A. A. KLOSE ◽  
J. P. HUDSPETH
Keyword(s):  
Effects Of Temperature ◽  
Temperature Time

A Profoundly Touchy Approved Spectrofluorimetric Approach for Assurance of Ixabepilone as Anticancer Drug by Utilizing Its Quenching Impact on Acetoxymercuric Fluorescein Reagent

2021 ◽  
pp. 39-52
Author(s):  
Hesham Salem ◽  
Amany Abdelaziz ◽  
Aliaa Gamal ◽  
Ramy El Sabaa
Keyword(s):  
Human Plasma ◽  
Anticancer Drug ◽  
Fluorescence Intensity ◽  
Solution Concentration ◽  
Quenching Effect ◽  
Bulk Powder ◽  
Optimized Conditions ◽  
Temperature Time ◽  
Sulfur Containing ◽  
Satisfactory Recovery

A dependable, sensitive, basic and cheap spectrofluorimetric approach has been created for test of sulfur-containing drug; ixabepilone in bulk powder, vials and human plasma. The approach depends on the quenching effect of ixabepilone on the fluorescence intensity of acetoxymercuric fluorescene (AMF) reagent at λem of 530 nm and λex of 500 nm. Parameters which will control the reaction such as pH, AMF solution concentration, temperature, time and solvents were examined and optimized. According to the optimized conditions, the proposed approach was practiced over the concentration area of 20-100 ng mL-1 with adequate linearity (r = 0.9998). The developed approach was approved confirming to ICH rules in terms of accuracy, precision, linearity, LOD and LOQ. The proposed approach was practiced to analyze ixabepilone in Ixempra® vials with satisfactory recovery % of 99.89 and RSE% of 1.24. The results achieved were compared to those achieved by an already reported HPLC approach.

Evaluation of Municipal Sludge Drying and Dewatering with Respect to Sludge Volume Reduction

1990 ◽  
Vol 22 (12) ◽  
pp. 153-161 ◽  
Author(s):  
Maryla Smollen
Keyword(s):  
Moisture Content ◽  
Treatment Strategies ◽  
Vacuum Drying ◽  
Municipal Sludge ◽  
Moisture Retention ◽  
Sludge Dewatering ◽  
Sludge Treatment ◽  
Energy Inputs ◽  
Retention Characteristics ◽  
Sludge Drying

A number of parameters that influence sludge dewatering behaviour have been identified, but there is a lack of consensus which of these are of the greatest concern in sludge treatment strategies. Moisture retention characteristics were obtained from vacuum drying of centrifuged sludge samples to subdivide moisture into immobilised, physically and chemically bound fractions. Physically bound moisture is responsible for unsatisfactory dewatering by centrifugation. Polyelectrolyte releases some of the immobilised water, but simultaneously increases the physically bound moisture content which gives rise to large energy inputs during mechanical dewatering. Commonly used dewaterability measurements do not appear to be linked to moisture retention characteristics.

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