Principles and potential of the anaerobic digestion of waste-activated sludge

Appels, Lise; Baeyens, Jan; Degrève, Jan; Dewil, Raf

doi:10.1016/j.pecs.2008.06.002

Cited by 2,559 publications

(1,436 citation statements)

References 142 publications

Supporting

Mentioning

1,319

Contrasting

Unclassified

Order By: Relevance

“…According to some researches, heating temperature and duration of the thermal pre-treatment depend on the nature of the sludge (Ariunbaatar et al, 2014;Appels et al, 2008). The generally accepted operation conditions vary between 150 and 230 C temperature, with time ranging from 20 to 60 min.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a thermal hydrolysis process for sludge pre-treatment

Sapkaite

Barrado

Fdz‐Polanco

et al. 2017

Journal of Environmental Management

View full text Add to dashboard Cite

a b s t r a c tAt industrial scale, thermal hydrolysis is the most used process to enhance biodegradability of the sludge produced in wastewater treatment plants. Through statistically guided Box-Behnken experimental design, the present study analyses the effect of TH as pre-treatment applied to activated sludge. The selected process variables were temperature (130-180 C), time (5e50 min) and decompression mode (slow or steam-explosion effect), and the parameters evaluated were sludge solubilisation and methane production by anaerobic digestion. A quadratic polynomial model was generated to compare the process performance for the 15 different combinations of operation conditions by modifying the process variables evaluated. The statistical analysis performed exhibited that methane production and solubility were significantly affected by pre-treatment time and temperature. During high intensity pre-treatment (high temperature and long times), the solubility increased sharply while the methane production exhibited the opposite behaviour, indicating the formation of some soluble but non-biodegradable materials. Therefore, solubilisation is not a reliable parameter to quantify the efficiency of a thermal hydrolysis pre-treatment, since it is not directly related to methane production. Based on the operational parameters optimization, the estimated optimal thermal hydrolysis conditions to enhance of sewage sludge digestion were: 140e170 C heating temperature, 5e35min residence time, and one sudden decompression.

show abstract

Section: Introductionmentioning

confidence: 99%

Optimization of a thermal hydrolysis process for sludge pre-treatment

Sapkaite

Barrado

Fdz‐Polanco

et al. 2017

Journal of Environmental Management

View full text Add to dashboard Cite

show abstract

“…But to run an engine it is found that presence of up to 30% carbon dioxide improve the engine performance whereas biogas containing more than 40% carbon dioxide needs scrubbing [10].…”

Section: Biogas Generation and Upgradingmentioning

confidence: 99%

Biogas Purification, Compression and Storage

2017

View full text Add to dashboard Cite

Municipal solid waste in the Kathmandu Valley and emerging cities has been a burden for the government of Nepal for over a decade. Nepal, these days, is notorious in illegal dumping of solid waste on riverbanks and crossroads at urban cities creating a serious environmental and public health problem besides destroying the city's beauty and hindering cultural and religious activities. Time and again, conflict of poorly managed landfill sites have arisen which led to halt of solid waste collection in Kathmandu valley for several days in a place where daily solid waste generation is about 500 tones of which 69 percent is of organic materials and 24 percent recyclable materials (plastics, paper, metal, glass). In order to solve the solid waste management problem in urban cities, the country failed to introduce any reliable and sustainable technology. However, among several waste management technologies available, biogas production may prove to be viable and sustainable waste to energy conversion technology. But biogas can supply energy only near to the plant, which limits its wide spread application and, therefore, bottling of biogas is a must to supply it in and around the cities and villages. In this paper we evaluate the model used in bio-based energy laboratory, Kathmandu University to upgrade and bottle biogas in a cylinder. It is found that the biogas purification, compression and storage system of Kathmandu University has net energy output 180 kWh th per cycle.

show abstract

“…Anaerobic treatment has two 35 major advantages over aerobic treatment, including energy recovery via methane production 36 and reduced energy input, since aeration is not required (Appels et al, 2008). Furthermore, 37 anaerobic effluent represents a practical platform for nutrient recovery (Ansari et al, 2016; 38 Xie et al, 2014b).…”

Section: Introduction 32mentioning

confidence: 99%

Factors governing the pre-concentration of wastewater using forward osmosis for subsequent resource recovery

Ansari

Hai

Guo

et al. 2016

Science of The Total Environment

View full text Add to dashboard Cite

This study demonstrated a technique using forward osmosis (FO) to pre-concentrate the organic matter in raw wastewater, thereby transforming low strength wastewater into an anaerobically digestible solution. The chemical oxygen demand (COD) of raw wastewater was concentrated up to approximately eightfold at a water recovery of 90%. Thus, even low strength wastewater could be pre-concentrated by FO to the range suitable for biogas production via anaerobic treatment. Excessive salinity accumulation in pre-concentrated wastewater was successfully mitigated by adopting ionic organic draw solutes, namely, sodium acetate, and EDTA-2Na. These two draw solutes are also expected to benefit the digestibility of the pre-concentrated wastewater compared to the commonly used draw solute sodium chloride. Significant membrane fouling was observed when operating at 90% water recovery using raw wastewater. Nevertheless, membrane fouling was reversible and was effectively controlled by optimising the hydrodynamic conditions of the cross-flow FO system. Thus, even low strength wastewater could be pre-concentrated using FO to the range suitable 21 for biogas production via anaerobic treatment. Excessive salinity accumulation in pre-22 concentrated wastewater was successfully mitigated by adopting ionic organic draw solutes, 23 namely, sodium acetate and EDTA-2Na. These two draw solutes are also expected to benefit 24 the digestibility of the pre-concentrated wastewater compared to sodium chloride. Significant 25 membrane fouling was observed when operating at 90% water recovery using raw 26 wastewater. Nevertheless, membrane fouling was reversible and was effectively controlled by 27 optimising the hydrodynamic conditions of the cross-flow FO system. 28Keywords: forward osmosis (FO); wastewater; pre-concentration; ionic organic draw 29 solution; anaerobic digestion; membrane fouling. 30 31 3

show abstract

Principles and potential of the anaerobic digestion of waste-activated sludge

Cited by 2,559 publications

References 142 publications

Optimization of a thermal hydrolysis process for sludge pre-treatment

Optimization of a thermal hydrolysis process for sludge pre-treatment

Biogas Purification, Compression and Storage

Factors governing the pre-concentration of wastewater using forward osmosis for subsequent resource recovery

Contact Info

Product

Resources

About