scholarly journals BATCH REACTOR PYROLYSIS OF STABILIZED SEWAGE SLUDGE: PRODUCT ANALYSIS AND SULPHUR BALANCE

2018 ◽  
Author(s):  
JAROSLAV MOŠKO ◽  
MICHAEL POHOŘELÝ ◽  
SIARHEI SKOBLIA ◽  
ZDENĚK BEŇO ◽  
OLGA BIČÁKOVÁ ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Batch Reactor ◽  
Product Analysis

Biolixiviation des métaux lourds et stabilisation des boues d'épuration : essai en bioréacteur opéré en mode cuvée

1993 ◽  
Vol 20 (1) ◽  
pp. 57-64 ◽  
Author(s):  
R. D. Tyagi ◽  
J. F. Blais ◽  
N. Meunier ◽  
D. Kluepfel
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Suspended Solids ◽  
Elemental Sulfur ◽  
Batch Reactor ◽  
Fecal Coliforms ◽  
Sludge Stabilization ◽  
Sludge Digestion ◽  
Batch Time ◽  
Phosphorus And Potassium

A biological process of heavy metals solubilization and sewage sludge stabilization was studied in a batch reactor of 30-L capacity. The acclimatized leaching microflora was composed of two major groups of thiobacilli: less acidophilic and acidophilic. A batch time of 10 days allows a substantial metal solubilization: cadmium (100%), copper (80%), manganese (80%), nickel (46%), and zinc (100%). The bioleaching process also causes a significative decrease in sludge total suspended solids (25%) and volatile suspended solids (32%), and a considerable reduction (under the detection limit of 10 cfu∙mL−1) of indicator bacteria (total coliforms, fecal coliforms, fecal streptococci). After filtration or centrifugation of the leached sludge, the solubilized metals were precipitated by lime neutralization. The phosphorus and potassium sludge contents were not affected by bioleaching process. These results indicate that the process of sludge digestion and metal leaching can be conducted in parallel in the same reactor. Key words: sewage sludge, heavy metals, bioleaching, stabilization, thiobacilli, elemental sulfur.

Wet oxidation of domestic sludge and process integration: the Mineralis® process

2001 ◽  
Vol 44 (10) ◽  
pp. 163-169 ◽  
Author(s):  
T. Lendormi ◽  
C. Prévot ◽  
F. Doppenberg ◽  
M. Spérandio ◽  
H. Debellefontaine
Keyword(s):  
Sewage Sludge ◽  
Process Integration ◽  
Batch Reactor ◽  
Ammonia Nitrogen ◽  
Treatment Temperature ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Wet Oxidation ◽  
Environmental Standards ◽  
Sewage Sludge Treatment

Wet oxidation (WO) in subcritical conditions is a new alternative to usual routes for sewage sludge treatment that complies with environmental standards. This paper presents tests carried out using a batch reactor and continuous pilot and industrial units, treating municipal sewage sludge. The main products after oxidation are CO2, water, VFA and ammonia. The results highlight the considerable influence of the treatment temperature and of the type of sewage sludge which is treated. At temperatures around 240°C, VFA fraction present in WO supernatant is limited to 50% because of the presence of non-degraded fatty compounds and surfactants. Moreover, the COD reduction is limited to 70%. On the contrary, at 300°C, COD removal efficiencies greater than 80% are achieved without any catalyst addition and, in addition, only highly biodegradable compounds remain in the oxidised liquor. In order to treat the residual ammonia nitrogen by biological processes, it is therefore necessary to obtain a VFA fraction as high as possible for achieving denitrification and then to operate the WO process at high temperature and without catalyst addition.

scholarly journals Biogas Production through Co-Digestion of Olive Mill with Municipal Sewage Sludge and Cow Manure

2021 ◽  
Vol 20 (2) ◽  
pp. 1-11
Author(s):  
Said Al Rabadi ◽  
◽  
Kamel Al-Zboon ◽  
Moayyad Shawaqfah ◽  
Rebhi Damseh ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Biogas Production ◽  
Batch Reactor ◽  
Anaerobic Treatment ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Experimental Investigations ◽  
Cow Manure ◽  
Operational Parameters ◽  
Olive Mill

The treatment of olive mill (OM) residues from agricultural facilities is a daunting challenge since tremendous amounts are disposed per annum that should be treated. One of the promising treatment methods is the anaerobic methanogenic digestion of OM residues. In current investigations, the anaerobic digestion of the OM substrate is enhanced through mixing its slurries with sewage sludge (SS) or with cow manure (C), which consists of the kernels for the digestion process. Besides feedstock, other operational parameters such as hydraulic retention time (HRT), temperature and pH have a great impact on the biogas production rate and quality. Experimental investigations were conducted by means of the anaerobic biodegradation of the substrate for OM-SS and -C using a batch reactor under mesophilic conditions and foreseen HRT for 30 days. Almost neutral pH values of 7.4-7.6 were found for the anaerobic treatment of the substrate for OM-SS, and a slightly acidic pH in the range of 4.8-5.3 was found for the anaerobic treatment of the substrate for OM-C. The results revealed that the biogas production for OM-SS and -C exceeded 0.07 and 0.31 LBiogas/(LFerm·day), respectively. Regarding the COD reduction, its removal efficiency was obtained as 46.1 and 53.8% for OM-SS and -C respectively. For economic concerns, significant methane yields were attained as 56.8 and 115.8 [LCH4/kgCOD] for the OM-SS and -C substrates, respectively. In virtue of these remarkable merits, anaerobic methanogenic digestion should be adapted to a commercial scale for the treatment and biogas production of OM residues.

scholarly journals Pyrolysis of biomass and refuse-derived fuel performance in laboratory scale batch reactor

2014 ◽  
Vol 35 (1) ◽  
pp. 141-152 ◽  
Author(s):  
Jacek Kluska ◽  
Marek Klein ◽  
Paweł Kazimierski ◽  
Dariusz Kardaś
Keyword(s):  
Thermogravimetric Analysis ◽  
Gas Flow ◽  
Batch Reactor ◽  
Optimum Conditions ◽  
Product Analysis ◽  
Flame Ionization ◽  
Refuse Derived Fuel ◽  
Infrared Spectrometer ◽  
Pyrolysis Of Biomass ◽  
Fluorescence Spectrometer

Abstract The results of pyrolysis of pine chips and refuse derived fuel fractions are presented. The experiments were carried out in a pilot pyrolysis reactor. The feedstock was analyzed by an elemental analyzer and the X-ray fluorescence spectrometer to determine the elemental composition. To find out optimum conditions for pyrolysis and mass loss as a function of temperature the thermogravimetric analysis was applied. Gases from the thermogravimetric analysis were directed to the infrared spectrometer using gas-flow cuvette to online analysis of gas composition. Chemical composition of the produced gas was measured using gas chromatography with a thermal conductivity detector and a flame ionization detector. The product analysis also took into account the mass balance of individual products.

Anaerobic co-digestion of sewage sludge and food waste using temperature-phased anaerobic digestion process

2004 ◽  
Vol 50 (9) ◽  
pp. 107-114 ◽  
Author(s):  
H.-W. Kim ◽  
S.-K. Han ◽  
H.-S. Shin
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Production Rate ◽  
Food Waste ◽  
Batch Reactor ◽  
Hydrolytic Activity ◽  
Organic Loading Rate ◽  
Methanogenic Activity ◽  
Ch4 Production ◽  
Low Efficiency

This study was performed to overcome the low efficiency of anaerobic digestion of sewage sludge and food waste by combining temperature-phased digestion, sequencing batch operation, and co-digestion technology. It was demonstrated that the temperature-phased anaerobic sequencing batch reactor (TPASBR) system for the co-digestion of sewage sludge and food waste resulted in enhanced volatile solids (VS) reduction and methane production rate. At the organic loading rate (OLR) of 2.7 g VS/l/d, the TPASBR system showed the higher VS reduction (61.3%), CH4 yield (0.28 l/g VSadded) and CH4 production rate (0.41 l CH4/l/d) than those (0.29 l CH4/l/d) of the mesophilic two-stage ASBR (MTSASBR). In the specific methanogenic activity (SMA) tests on thermophilic biomass of the TPASBR system, the average SMA of acetate (93 ml CH4/gVSS/d) was much higher than those of propionate (46 ml CH4/g VSS/d) and butyrate (76 ml CH4/g VSS/d). Also, higher specific hydrolytic activity (SHA, 217 mg COD/g VSS/d) of the biomass supported fast hydrolysis under thermophilic conditions. The track study revealed that the most active period of the 24 h cycle was between 6 and 12 h. The enhanced performance of the TPASBR system could be attributed to longer solids retention time, fast hydrolysis, higher CH4 conversion rate, and balanced nutrient condition of co-substrate. It was verified that this combination could be a promising and practical alternative for the simultaneous recycling of two types of organic fraction of municipal solid waste (OFMSW) with high stability.

scholarly journals Effect of Temperature on the Hydrotreatment of Sewage Sludge-Derived Pyrolysis Oil and Behavior of Ni-Based Catalyst

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1273
Author(s):  
Maria V. Alekseeva (Bykova) ◽  
Olga A. Bulavchenko ◽  
Andrey A. Saraev ◽  
Anna M. Kremneva ◽  
Mikhail V. Shashkov ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Elevated Temperatures ◽  
Batch Reactor ◽  
Active Phase ◽  
High Energy ◽  
Effect Of Temperature ◽  
Pyrolysis Oil ◽  
Reaction Products ◽  
Energy Potential ◽  
Oil Refineries

The high-energy potential of wastewater sewage sludge (SS) produced in large amounts around the world makes it an attractive feedstock for fuels and energy sectors. Thermochemical valorization relying on pyrolysis of SS followed by hydrotreatment of pyrolysis oil (Py-SS) might even allow the integration of SS into existing oil refineries. In the present study, catalytic hydrotreatment of Py-SS was performed over a NiCuMo-P-SiO2 catalyst in a batch reactor at temperatures in the range of 200–390 °C. Due to sulfur presence in the feed, the increasing reaction temperature induced in situ transformation of metallic Ni into Ni3S2 in the catalyst. In contrast, the Ni3P active phase possessed remarkable stability even at the harshest reaction conditions. The oxygen content in the reaction products was decreased by 59%, while up to 52% of N and 89% of S were removed at 390 °C. The content of free fatty acids was greatly reduced by their conversion to n-alkanes, while the larger amount of volatile aromatics was generated from high molecular mass compounds. The quality of oil-derived products greatly changed at elevated temperatures, providing strong evidence of effective upgrading via decarboxy(ny)lation, hydrogenation, and hydrocracking transformations.

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