Structure modification and extracellular polymeric substances conversion during sewage sludge biodrying process

Cai, Ling; Krafft, Thomas; Chen, Tongbin; Gao, Dingshan; Wang, Li

doi:10.1016/j.biortech.2016.05.102

Cited by 40 publications

(7 citation statements)

References 33 publications

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“…The important parameters are initial moisture content, flow rate of air, total time of process and temperature. Nevertheless, there are drawbacks in such processes as it may take several days for drying, and the degree of moisture removal is lower compared to thermal drying [30,31]. Pressurized electro-osmotic dewatering coupled with bio drying can reduce moisture content from 83% to 60% in a matter of minutes under optimal processing conditions [32].…”

Section: High Moisture Contentmentioning

confidence: 99%

See 1 more Smart Citation

Thermochemical conversion of sewage sludge: A critical review

Quan

Kamran

Williams

2020

Progress in Energy and Combustion Science

491

117

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Section: High Moisture Contentmentioning

confidence: 99%

“…31.06 e 13.64 e 22.02 b 24.5 b 19.85 e a= as received, b= dry basis, c= moisture free basis, d= dry ash free basis, e= by difference.…”

mentioning

confidence: 99%

Thermochemical conversion of sewage sludge: A critical review

Quan

Kamran

Williams

2020

Progress in Energy and Combustion Science

491

117

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“…The temperature in the biodrying process is in the range of 28.4-34.1C. This was done following several previous studies using a range of 30-40°C [13,14]. The variations used in this biodrying research was shown in Table 1 and the image of vegetable waste used in this work was displayed in Figure 1.…”

Section: Time and Locationmentioning

confidence: 99%

Vegetable Waste Biodrying Treatment for Energy Recovery as Refuse Derived Fuel Potential

Septiariva

Suryawan²,

Sari³

2022

J. Tek. Kim. Ling

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Sampah sayuran merupakan jenis sampah organik biodegradable yang dapat ditemukan di setiap lokasi di Indonesia. Selain itu, timbunan sampah sayuran juga mendominasi sampah makanan. Pemanfaatan lebih lanjut sampah sayuran salah satunya dapat menggunakan pemulihan energi. Pemulihan energi sampah sayuran dapat dilakukan dengan biodrying yang tergantung dengan waktu dan bioaktivator. Tujuan dari studi ini adalah untuk mengetahui pengaruh waktu dan pemberian aktivator pada proses biodrying sampah sayuran. Penelitian ini menggunakan sampah seberat 0,5 kg dengan pemberian laju alir udara 15 liter/menit, suhu pada proses berada pada rentang 28,4-34,1°C. Biodaktivator yang digunakan dalam penelitian ini adalah ragi roti, tempe, dan tape. Penurunan massa maksimum terjadi pada proses biodrying dengan penambahan bioaktivator. Hasil uji pengaruh pada multivariate menunjukkan adanya pengaruh waktu dan bioaktivator pada perubahan nilai kadar air dan nilai kalor. Akan tetapi, interaksi antara waktu dan bioaktivator hanya berpengaruh pada kadar air. Hal ini karena proses degradasi terjadi memanfaatkan mikroorganisma yang tersimpan di dalam cairan bioaktivator dan air dalam sampah sayuran. Penelitian lebih lanjut diperlukan untuk mengetaui lebih jelas pengaruh variabel lain dalam proses biodrying terutama pada waktu detensi yang tepat dan bioaktivator yang mempercepat laju degradasi.Vegetable waste is a type of biodegradable organic waste found in every location in Indonesia. In addition, vegetable waste also dominates food waste. One of the ways to use vegetable waste is to use energy recovery. Energy recovery of vegetable waste can be done by time-dependent biodrying and bioactivator. This study aimed to determine the effect of time and activator application on the vegetable waste biodrying process. In this study, 0.5 kg of waste is used with an airflow rate of 15 liters/minute, the temperature in the process is in the range of 28.4-34.1°C. The bioactivators used in this study were baker's yeast, tempeh, and tape. The maximum decrease in mass occurs in the biodrying process with the addition of a bioactivator. The multivariate effect test results showed an effect of time and bioactivator on changes in water content and caloric value. However, the interaction between time and bioactivator only affects the water content. This is because the degradation process occurs utilizing microorganisms stored in the bioactivator liquid and water in vegetable waste. Further research is needed to know the effect of other variables in the biodrying process, especially the right detention time and bioactivators that accelerate the rate of degradation.

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“…When a bulking agent was added to DS, its physicochemical properties could play important roles and affect the organic matter degradation for bio-heat generation during biodrying [3,8,9]. What is more, the slurry-type DS is flocculated by multilayered extracellular polymeric substances (EPS), which are secreted by microbes in consumption of organic matter and considered crucial for dewaterability of sludge [10]. Besides, EPS can be used to serve as carbon or energy sources for the microbes in conditions of short nutrient supply [11].…”

Section: Introductionmentioning

confidence: 99%

“…Hence, investigating the transformation of EPS is crucial for understanding the effects of bulking agents on the organic matter biodegradation patterns during the biodrying process. Cai et al [10] investigated the EPS variation during different phases of DS biodrying with sawdust (SD) as a bulking agent. However, few studies have made a thorough inquiry into multi-layered EPS profiles of DS biodrying processes with different bulking agents.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bulking Agents on Dewatered Sludge Biodrying Followed by Thermal Drying

Hao

Lei

et al. 2023

Processes

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As an exogenous substance, bulking agent plays a considerable role in dewatered sludge (DS) biodrying by affecting the organics degradation and water migration. Meanwhile, biodried product needs to be further dried because its final moisture content (MC) is usually too high for direct incineration. In this study, the influence of adding different bulking agents on organics decomposition and extracellular polymeric substances (EPS) release during DS biodrying, and thermal drying characteristics of the biodrying mixtures was investigated. Results showed that spent coffee ground (SCG), corncob (CC) and wheat husk (WH) improved water removal ratios of DS biodrying. SCG contributed various types of organic matter to the biodrying matrix, thus attaining the longest high-temperature period (4.5 days). Meanwhile, SCG contributed lipids, which have high calorific value, to the biodrying pile, leading to the highest biodrying index (3.70) among all treatments. SCG, CC and WH also accelerated EPS delamination, which was beneficial for microbial activity and bound water release. Besides, the biodried product with SCG was endowed with the highest C content and calorific value. Furthermore, bulking agents improved the thermal-drying rates of the feedstocks, and intensified the positive impacts of biodrying on the thermal-drying characteristics of the mixtures. In particular, the biodried product with SCG had a high drying rate even with low residual water content in the mixture.

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Structure modification and extracellular polymeric substances conversion during sewage sludge biodrying process

Cited by 40 publications

References 33 publications

Thermochemical conversion of sewage sludge: A critical review

Thermochemical conversion of sewage sludge: A critical review

Vegetable Waste Biodrying Treatment for Energy Recovery as Refuse Derived Fuel Potential

Effect of Bulking Agents on Dewatered Sludge Biodrying Followed by Thermal Drying

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