scholarly journals Drying characteristics of wastewater sludge according to outside air inflow conditions

2018 ◽  
Author(s):  
Sang Hyun Oh ◽  
Ki Ho Park ◽  
Byoung Hyuk Yu ◽  
Sung Il Kim
Keyword(s):  
Thin Film ◽  
Sewage Sludge ◽  
Wastewater Sludge ◽  
Drying Process ◽  
Drying Characteristics ◽  
Inflow Condition ◽  
Materials Used ◽  
Sludge Drying ◽  
Drying Efficiency ◽  
Inflow Conditions

The purpose of this study is to analyze the changes of drying efficiency according to the inflow conditions of outside air into the drying equipment during the drying process in order to reduce the energy used in the drying process of sludge. We conducted the experiment using a vertical thin film dryer. Materials used for the experiment are sewage sludge. As a result of the study, higher drying efficiency was obtained in the case of outside air inflow than in the case of no outside air inflow. In addition, optimum condition of outside air inflow was derived. Keywords: Drying; Sludge; Drying efficiency; Air inflow condition 

Study on Microwave Drying Process and Drying Characteristics of Sewage Sludge

2013 ◽  
Vol 838-841 ◽  
pp. 2643-2647
Author(s):  
Jin Ping Li ◽  
Meng Yao Li ◽  
Wen Yao ◽  
Ni Wang
Keyword(s):  
Energy Consumption ◽  
Sewage Sludge ◽  
Lower Energy ◽  
Microwave Drying ◽  
Drying Rate ◽  
Municipal Sludge ◽  
Drying Process ◽  
Drying Characteristics ◽  
Pretreatment Time ◽  
Short Time

Combination of oven and microwave and only oven are two ways to study municipal sludge,and it investigates whether different size, microwave drying pretreatment, pretreatment time and oven temperature characteristics have effect on drying characteristics. The results shows that: using microwave to dry sludge need short time, the drying rate is fast, combination of oven and microwave has higher drying rate and lower energy consumption than only oven.

Effects of air parameters on sewage sludge drying characteristics and regression analyses of drying model coefficients

2021 ◽  
Vol 198 ◽  
pp. 117501
Author(s):  
Qiushuang Zheng ◽  
Ziyuan Hu ◽  
Penggang Li ◽  
Long Ni ◽  
Guanying Huang ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Regression Analyses ◽  
Drying Characteristics ◽  
Drying Model ◽  
Sludge Drying

Exergy Analysis and Optimized Power Generation Applied to the Co-Combustion of Sewage Sludge and Coal

2011 ◽  
Vol 354-355 ◽  
pp. 67-73
Author(s):  
Yu Na Fang ◽  
Yong Chi ◽  
Yu Qi Jin
Keyword(s):  
Sewage Sludge ◽  
Optimization Model ◽  
Exergy Analysis ◽  
Mathematical Optimization ◽  
Calculation Results ◽  
Generating Capacity ◽  
Optimization Parameters ◽  
Mathematical Optimization Model ◽  
Sludge Drying ◽  
Drying Efficiency

In this paper, the classical sewage sludge and coal co-combustion power generating system was optimized. The regenerative steam in the extraction turbine was partly used for the sludge drying. And then, the mathematics model was established based on the exergy theory. Several extraction points were compared to find out the most optimization parameters (drying efficiency of the dryer, pressure and tempreture). The result showed that, with different steam temperature and pressure at different extraction points, the influence to the system exergy efficiency caused by the percentage of moisture and drying efficiency was different. When the sludge moisture content went to about 35%, the generating capacity increment was moderating. After the calculation and comparison, the error between the calculation results of the mathematical optimization model and the classical thermodynamic method was very small. The calculation in mathematical optimization model based on exergy analysis was relatively simple, and analysis of the relationship between variables was easier.

Sewage sludge drying process integration with a waste-to-energy power plant

2015 ◽  
Vol 42 ◽  
pp. 159-165 ◽  
Author(s):  
A. Bianchini ◽  
L. Bonfiglioli ◽  
M. Pellegrini ◽  
C. Saccani
Keyword(s):  
Power Plant ◽  
Sewage Sludge ◽  
Process Integration ◽  
Waste To Energy ◽  
Drying Process ◽  
Sludge Drying

scholarly journals Determination of the Bacterial Compositions in the Bio-Drying Process of Sewage Sludge from Wastewater

2021 ◽  
Author(s):  
Joseph Ikenna Ubah ◽  
Ogwueleka Tochukwu Chibueze ◽  
C. I Ofeoshi
Keyword(s):  
Sewage Sludge ◽  
Bacterial Communities ◽  
Treatment Plant ◽  
Free Water ◽  
Staining Technique ◽  
Organic Content ◽  
Wastewater Sludge ◽  
Water Evaporation ◽  
Drying Process ◽  
Plate Technique

Abstract The aim of this study is to determine the bacterial compositions during the bio-drying process of sewage sludge. Bio-dried products and sewage sludge were randomly collected from the Wupa wastewater/sludge treatment plant in Idu Industrial area Abuja, Federal Capital Territory, Nigeria. A mixture of sewage sludge and sawdust that were bio–dried and cured before this experiment were composition of the bio–dried product. The bacterial communities were analyzed in the laboratory using Pour Plate Technique to examine the total bacterial present in the sewage sludge bio-drying material (SSBM) and the bacterial were later isolated using other techniques like Oxidase test, Catalase test, Grams Staining technique and Spread Plate Technique. Evaporation of free water and water formation was determined by humidity gauge and moisture-oven drying method. From the results obtained, Acinetobacter was the most abundant bacterial during the initial and final thermophilic phases (43% and 37%) respectively. Bacillus was the most abundant amid the cooling stage (53%). The water evaporation and water generation rate were credited to the degradation of organic content of the SSBM and heat produced by bacterial activities. From this study, there is a clear indication that the bacterial density grades that increase the temperature of the SSBM during the bio–drying process reshaped the bacterial communities.

scholarly journals Computational modeling of biosludge drying

2021 ◽  
Vol 9 (8) ◽  
pp. 219-232
Author(s):  
Nayara Vilela Avelar ◽  
Ana Augusta Passos Rezende ◽  
Antonio Marcos de Oliveira Siqueira ◽  
Cláudio Mudadu Silva ◽  
Angélica de Cássia Oliveira Carneiro
Keyword(s):  
Moisture Content ◽  
Initial Moisture Content ◽  
Wastewater Sludge ◽  
Moisture Distribution ◽  
Drying Process ◽  
Urban Wastewater ◽  
Complex Process ◽  
Simulated Temperature ◽  
Sludge Drying ◽  
Good Agreement

Considerable increases in industrial and urban wastewater sludge generation in recent years require proper treatment, such as thermal drying, and disposal. The sludge drying is a complex process involving simultaneous and coupled heat and mass transfer, which can be modeled by taking into account mass and heat balances, and assuming that water diffuses according to kinetic laws. This research implemented a simulation model for biosludge drying processes to predict the temperature and moisture distribution inside the biosludge, using the COMSOL Multiphysics® simulation program v5.2. A parametric analysis was carried out to determine the effect of initial moisture content on biosludge final temperature and moisture reduction. The simulated temperature and moisture content were experimentally validated and good agreement was observed between the simulation and experimental results. This model is a useful tool to optimize the drying process and develop better strategies for the control of the system.

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.

Sewage Sludge Flow and Drying Characteristics in Paddle Dryers

2013 ◽  
Vol 334-335 ◽  
pp. 365-368 ◽  
Author(s):  
Hou Lei Zhang ◽  
Xin Zhi Liu ◽  
Shu Guang Zhu ◽  
Bin Li
Keyword(s):  
Sewage Sludge ◽  
Inlet Temperature ◽  
Limited Data ◽  
Drying Characteristics ◽  
Sludge Disposal ◽  
Mass Flowrate ◽  
Energy Consuming ◽  
Sludge Drying ◽  
Thermal Oil ◽  
Monotonic Relation

Sewage sludge from wastewater treatment is being more and more produced in many countries. For sewage sludge disposal, drying operation is usually required and greatly energy-consuming. Paddle dryers, one kind of indirect dryers, are widely used in removing moisture of sewage sludge recently, but the design, to some extent, still depends on empirical and limited data. In this paper, we presented preliminary experimental results of sewage sludge drying based on a 3 m2paddle dryer prototype. The effects of thermal oil inlet temperature on outlet moisture content and mass flowrate of initial sludge are recorded and analyzed. A simple monotonic relation between mass flowrate of initial sludge and thermal oil inlet temperature does not exist. Besides, we performed the drying experiment of adding low-value biomass (rice husk) into wet sewage sludge. The results show that the drying performance is improved significantly.

Konsumsi Energi Pada Alat Pengering Surya dan Tipe Bak Untuk Pengeringan Biji Kakao

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Lamhot P. Manalu
Keyword(s):  
Specific Energy ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Solar Irradiation ◽  
Drying Process ◽  
Food Industries ◽  
Solar Dryer ◽  
Agricultural Applications ◽  
Drying System ◽  
Drying Efficiency

Crop drying is essential for preservation in agricultural applications. It is performed either using fossil fuels in an artificial mechanical drying process or by placing the crop under the open sun. The first method is costly and has a negative impact on the environment, while the second method is totally dependent on the weather. The drying process requires a lot of energy in relation to the amount of water that must be evaporated from the product. It is estimated that 12% of the total energy used by the food industries and agriculture absorbed in this process. Due to the limitation of energy resources, it is important to keep researching and developing of diversification and optimization of energy This study aims to assess the use of energy for cocoa drying using solar energy dryer and bin-type dryer, as well as to determine the drying efficiency of each type of dryer. The results showed that the efficiency of the solar dryer drying system ranges between 36% to 46%, while the tub-type dryers between 21.7% to 33.1%. The specific energy of solar dryer ranged from 6.17-7.87 MJ / kg, while the tub-type dryers 8.58-13.63 MJ / kg. Dryer efficiency is influenced by the level of solar irradiation and the amount of drying load, the higher the irradiation received and more cocoa beans are dried, the drying efficiency is also higher and the specific energy further down.Proses pengeringan memerlukan banyak energi sehubungan dengan banyaknya air yang harus diuapkan dari bahan yang dikeringkan. Pengeringan dapat dilakukan dengan menggunakan pengering mekanis berbahan bakar fosil atau dengan menempatkan produk di bawah matahari terbuka. Metode pertama adalah mahal dan memiliki dampak negatif pada lingkungan, sedangkan metode kedua sangat tergantung pada cuaca. Diperkirakan bahwa 12% dari total energi yang dipergunakan oleh industri pangan dan pertanian diserap untuk proses ini. Mengingat semakin terbatasnya sumber energi bahan bakar minyak maka usaha diversifikasi dan optimasi energi untuk pengeringan perlu terus diteliti dan dikembangkan. Salah satunya adalah pemanfaatan energi surya sebagai sumber energi terbarukan. Penelitian ini bertujuan untuk mengkaji penggunaan energi untuk pengeringan kakao dengan memakai pengering energi surya dan pengering tipe bak, serta untuk mengetahui efisiensi pengeringan dari masing-masing tipe pengering. Hasil kajian menunjukkan bahwa efisiensi total sistem pengeringan alat pengering surya berkisar antara 36% dan 46%, sedangkan pengering tipe bak antara 21.7% dan 33.1%. Kebutuhan energi spesifik alat pengering surya berkisar antara 6.17-7.87 MJ/kg, sedangkan alat pengering tipe bak 8.58-13.63 MJ/kg. Efisiensi alat pengering dipengaruhi oleh tingkat iradiasi surya dan jumlah beban pengeringan, semakin tinggi iradiasi yang diterima pengering serta semakin banyak biji kakao yang dikeringkan, maka efisiensi pengeringan juga semakin tinggi dan kebutuhan energi spesifik semakin turun.Keywords: energy, efficiency, cocoa, solar dryer, bin-type dryer.

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