A multi-level biogas model to optimise the energy balance of full-scale sewage sludge conventional and THP anaerobic digestion

2020 ◽  
Vol 159 ◽  
pp. 756-766
Author(s):  
Jin Liu ◽  
Stephen R. Smith
Keyword(s):  
Anaerobic Digestion ◽  
Energy Balance ◽  
Sewage Sludge ◽  
Full Scale ◽  
Multi Level

scholarly journals The Energetic Aspect of Organic Wastes Addition on Sewage Sludge Anaerobic Digestion: A Laboratory Investigation

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6113
Author(s):  
Aleksandra Szaja ◽  
Agnieszka Montusiewicz ◽  
Magdalena Lebiocka
Keyword(s):  
Anaerobic Digestion ◽  
Energy Balance ◽  
Sewage Sludge ◽  
Wastewater Treatment Plants ◽  
Organic Wastes ◽  
Successful Implementation ◽  
Anaerobic Reactors ◽  
Component Systems ◽  
Key Factor ◽  
Energetic Aspect

One of the possibilities to achieve energy neutrality of wastewater treatment plants (WWTPs) is the implementation of the anaerobic co-digestion strategy. However, a key factor in its successful implementation on the technical scale is the application of components with complementary composition to sewage sludge (SS). In the 7resent study, the influence of adding various co-substrates on the energy balance of anaerobic digestion was evaluated. The following organic wastes were used as additional components to SS: organic fraction of municipal solid waste (OFMSW) and distillery spent wash (DW) applied in two- and three-component systems. The experiments were performed in semi-flow anaerobic reactors with the volume of 40 L under mesophilic conditions (35 °C) at hydraulic retention time (HRT) of 20, 18, and 16 d. The application of substrates to SS resulted in enhancements of methane yields as compared to SS mono-digestion. The statistically significant differences were observed in tertiary mixtures at both HRT of 18 and 16 d. Therein, average values were 0.20 and 0.23 m3 kg−1VSadd at HRT of 18 and 16 d, respectively. Among all co-digestion series, the most beneficial effect on energy balance was found in 20% v/v DW presence in both two- and three-component systems at HRT of 16 d.

Disintegration of excess activated sludge – evaluation and experience of full-scale applications

2006 ◽  
Vol 53 (12) ◽  
pp. 229-236 ◽  
Author(s):  
J. Zábranská ◽  
M. Dohányos ◽  
P. Jeníček ◽  
J. Kutil
Keyword(s):  
Organic Matter ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Biogas Production ◽  
Full Scale ◽  
Energy Yield ◽  
Operational Experience ◽  
Digested Sludge

Anaerobic digestion of sewage sludge can be improved by introducing a disintegration of excess activated sludge as a pretreatment process. The disintegration brings a deeper degradation of organic matter and less amount of output sludge for disposal, a higher production of biogas and consequently energy yield, in some cases suppression of digesters foaming and better dewaterability. The full-scale application of disintegration by a lysate-thickening centrifuge was monitored long term in three different WWTPs. The evaluation of contribution of disintegration to biogas production and digested sludge quality was assessed and operational experience is discussed. Increment of specific biogas production was evaluated in the range of 15–26%, organic matter in digested sludge significantly decreased to 48–49%. Results proved that the installation of a disintegrating centrifuge in WWTPs of different sizes and conditions would be useful and beneficial.

System Design and Full-Scale Plant Study on a Drying-Incineration System for Sewage Sludge

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1453-1466 ◽  
Author(s):  
S. Sakai ◽  
M. Hiraoka ◽  
N. Takeda ◽  
I. Ohhama
Keyword(s):  
Energy Balance ◽  
Sewage Sludge ◽  
System Design ◽  
Waste Heat ◽  
Calorific Value ◽  
Full Scale ◽  
Energy Balance Model ◽  
Fuel Oil ◽  
Balance Model ◽  
Gas Treatment

The system design of a drying-incineration process for sewage sludge is discussed using an energy-balance model of the system. In particular, the profitability of this system is considered from the energy and cost points of view. An energy-balance model including drying, incineration, waste heat recovery, and exhaust gas treatment processes was formulated. This showed that autothermic conditions could be established at a lower dewatered cake calorific value, i.e., 350 to 400 kcal/kg wet solids (WS), in the drying-incineration system, in contrast to the higher dewatered cake calorific value of 700 to 750 kcal/kg WS necessary to produce autothermic conditions in direct incineration systems. The drying-incineration system had reduced energy costs but involved an increase in investment costs due to construction of the dryer. The authors designed a full-scale plant at the East Area Sludge Center in Kobe City, Japan. The capacity of one line in this plant is 200 tons of cake per day. From the results of full-scale operation, fuel oil consumption was 23 l/t cake (at a cake moisture content of 81.2% and a low calorific value of 180 kcal/kg), which is a lower value compared to conventional incineration systems.

Thermophilic vs. mesophilic anaerobic digestion of waste activated sludge: Modelling and energy balance for its applicability at a full scale WWTP

2020 ◽  
Vol 156 ◽  
pp. 235-248 ◽  
Author(s):  
Barbara Ruffino ◽  
Alberto Cerutti ◽  
Giuseppe Campo ◽  
Gerardo Scibilia ◽  
Eugenio Lorenzi ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Energy Balance ◽  
Activated Sludge ◽  
Full Scale ◽  
Waste Activated Sludge
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