Influence of Anaerobic Mesophilic and Thermophilic Digestion on Cytotoxicity of Swine Wastewaters

2020 ◽  
Vol 54 (5) ◽  
pp. 3032-3038 ◽  
Author(s):  
Nedal Massalha ◽  
Michael J. Plewa ◽  
Thanh H. Nguyen ◽  
Shengkun Dong
Keyword(s):  
Thermophilic Digestion

Enhancement of Thermophilic Digestion of Food Waste (FW) via Trace Element Supplementation

2019 ◽  
Vol 6 (1) ◽  
pp. 8-17
Author(s):  
Nuri Azbar ◽  
◽  
Kubra Arslan ◽  
Tugba Keskin ◽  
Duygu Karaalp
Keyword(s):  
Trace Element ◽  
Food Waste ◽  
Thermophilic Digestion

Effects of Various Sewage Sludge Treatment Processes on the Survival of Potato Cyst-Nematodes (Globodera spp.) and the Implications for Disposal

1989 ◽  
Vol 21 (8-9) ◽  
pp. 909-916
Author(s):  
A. M. Spaull ◽  
D. M. McCormack ◽  
E. B. Pike
Keyword(s):  
Anaerobic Digestion ◽  
Potato Cyst Nematodes ◽  
Cyst Nematodes ◽  
Sludge Treatment ◽  
Treatment Processes ◽  
Sewage Sludge Treatment ◽  
Thermophilic Digestion ◽  
C 30 ◽  
Effluent Exposure ◽  
Potato Crops

Samples of sewage sludges, taken over a 12-month period from 9 Scottish sewage works, contained on average 0.24 cysts of Globodera spp. (potato cyst-nematodes) of which 11% were viable. The incidence was not significantly related to season or to the presence of vegetable-processing effluent. Exposure of cysts in sludge to mesophilic anaerobic digestion (35 °C, 30 min) cold anaerobic digestion (9 weeks), pasteurisation (70 °C, 30 min) and aerobic thermophilic digestion (60 °C, ld) reduced viability of eggs within the cysts by almost 100%. Sludges so treated can therefore be considered to be free from infection risk to potato crops, although the non-infective cysts may still be recovered. Treatment with lime at pH 11.5 (20 °C, 24 h), by aerobic stabilisation in an oxidation ditch (7 weeks) and by activated-sludge treatment (5d) did not reduced viability acceptably. Accelerated cold digestion did not reduce viability sufficiently after the usual 15 weeks but rendered eggs completely non-viable after 21 weeks. The results show that even sludge treated to destroy viable cysts should not be applied to land used for growing seed potatoes and subject to testing for freedom from infestation. Treatment destroying viability should increase the acceptability of sludge for ware potato growers, although the numbers of cysts applied in untreated sludge would be unlikely to increase significantly levels of cysts in soils already infested.

Anaerobic thermophilic digestion of sewage sludge with a thickened sludge recycle

2012 ◽  
Vol 65 (3) ◽  
pp. 403-409 ◽  
Author(s):  
A. Ya. Vanyushina ◽  
Yu. A. Nikolaev ◽  
A. M. Agarev ◽  
M. V. Kevbrina ◽  
M. N. Kozlov
Keyword(s):  
Retention Time ◽  
Municipal Wastewater ◽  
Hydraulic Retention Time ◽  
Biogas Production ◽  
Wastewater Sludge ◽  
Recycling Process ◽  
Digested Sludge ◽  
Volatile Solids ◽  
Solids Retention ◽  
Thermophilic Digestion

The process of anaerobic thermophilic digestion of municipal wastewater sludge with a recycled part of thickened digested sludge, was studied in semi-continuous laboratory digesters. This modified recycling process resulted in increased solids retention time (SRT) with the same hydraulic retention time (HRT) as compared with traditional digestion without recycling. Increased SRT without increasing of HRT resulted in the enhancement of volatile substance reduction by up to 68% in the reactor with the recycling process compared with 34% in a control conventional reactor. Biogas production was intensified from 0.3 L/g of influent volatile solids (VS) in the control reactor up to 0.35 L/g VS. In addition, the recycling process improved the dewatering properties of digested sludge.

Instability diagnosis and syntrophic acetate oxidation during thermophilic digestion of vegetable waste

2018 ◽  
Vol 139 ◽  
pp. 263-271 ◽  
Author(s):  
Dong Li ◽  
Yi Ran ◽  
Lin Chen ◽  
Qin Cao ◽  
Zhidong Li ◽  
...  
Keyword(s):  
Vegetable Waste ◽  
Acetate Oxidation ◽  
Syntrophic Acetate Oxidation ◽  
Thermophilic Digestion

Changes of Metals Forms During the Thermophilic Digestion of Municipal and Tannery Wastes

1995 ◽  
pp. 495-495
Author(s):  
J. Cebula ◽  
M. Bodzek ◽  
K. Loska
Keyword(s):  
Tannery Wastes ◽  
Thermophilic Digestion

scholarly journals Analysis of the implementation of biogas plants: pluses and minuses of the thermophilic digestion

2019 ◽  
Vol 1399 ◽  
pp. 055067
Author(s):  
J An ◽  
N E Sokolinskaya
Keyword(s):  
Biogas Plants ◽  
Thermophilic Digestion

Inactivation of pathogenic bacteria under mesophilic and thermophilic conditions

1997 ◽  
Vol 36 (6-7) ◽  
pp. 25-32 ◽  
Author(s):  
Haruki Watanabe ◽  
Tomokazu Kitamura ◽  
Shuichi Ochi ◽  
Masaaki Ozaki
Keyword(s):  
Anaerobic Digestion ◽  
Fecal Coliform ◽  
Pathogenic Bacteria ◽  
Anaerobic Treatment ◽  
Digested Sludge ◽  
Primary Sludge ◽  
Digestion Process ◽  
Mesophilic Digestion ◽  
Thermophilic Digestion ◽  
Number Of Bacteria

This paper concerns field survey and laboratory experiment on the inactivation of pathogenic bacteria during sludge treatment processes with particular emphasis on anaerobic digestion process. We surveyed the inactivation of pathogenic bacteria processes by sampling various types of sludges from 17 wastewater treatment plants located in Japan and counting the number of bacteria in the sampled sludges. The bacteria we counted included fecal coliform groups, enterococcus and salmonella. The median number of fecal coliform groups in primary sludge was found to be 105 MPN/g, while the number of fecal coliform groups in digested sludge decreased to 103 MPN/g. We also confirmed that the treatments of dewatering using inorganic coagulant, drying and composting are also effective in inactivating pathogenic bacteria. In addition, we studied the performance conditions of anaerobic digestion and the degree of inactivation of pathogenic bacteria in the experiment of anaerobic treatment of the primary sludge. This study showed that the number of fecal coliform groups in mesophilic digestion sludge was in the range of 102 to 104 MPN/g regardless of the HRT, whereas the number of bacteria in thermophilic digestion sludge was of the order of 100 MPN/g, clearly indicating that the number of bacteria substantially decreases when the sludge is digested at thermophilic temperature. The number of enterococcus in digested sludge was in the range of 102 to 105 MPN/g after the sludge was subjected to mesophilic digestion while the number decreased to 100 MPN/g after the sludge was digested at thermophilic temperature. The number of salmonella in digested sludge was in the range of 1.8 to 30 MPN/4g after the sludge was digested at mesophilic temperature, but the number decreased to less than 1.8 MPN/4g after the sludge went through thermophilic digestion process. The thermophilic digestion is thus effective in inactivating pathogenic bacteria.

The influence of the total-ammonia concentration on the thermophilic digestion of cow manure

1985 ◽  
Vol 14 (1) ◽  
pp. 19-35 ◽  
Author(s):  
G. Zeeman ◽  
W.M. Wiegant ◽  
M.E. Koster-Treffers ◽  
G. Lettinga
Keyword(s):  
Ammonia Concentration ◽  
Cow Manure ◽  
Total Ammonia ◽  
Thermophilic Digestion

The synergistic effect of rumen cellulolytic bacteria and activated carbon on thermophilic digestion of cornstalk

2021 ◽  
pp. 125566
Author(s):  
Zhijie Xie ◽  
Xianghui Meng ◽  
Hongxia Ding ◽  
Qin Cao ◽  
Yichao Chen ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Synergistic Effect ◽  
Cellulolytic Bacteria ◽  
Thermophilic Digestion
Sign in / Sign up

Export Citation Format

Share Document