Anaerobic digestion with partial ozonation minimises greenhouse gas emission from sludge treatment and disposal

2006 ◽  
Vol 53 (3) ◽  
pp. 255-263 ◽  
Author(s):  
H. Yasui ◽  
R. Matsuhashi ◽  
T. Noike ◽  
H. Harada
Keyword(s):  
Anaerobic Digestion ◽  
Greenhouse Gas ◽  
Greenhouse Gas Emission ◽  
The Novel ◽  
Gas Emission ◽  
Sludge Treatment ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Sludge Cake ◽  
Treatment And Disposal

A novel anaerobic digestion process combined with partial ozonation on digested sludge was demonstrated for improving sludge digestion and biogas recovery by full-scale testing for 2 years and its performance was compared with a simultaneously operated conventional anaerobic digestion process. The novel process requires two essential modifications, which are ozonation for enhancing the biological degradability of sludge organics and concentrating of solids in the digester through a solid/liquid separation for extension of SRT. These modifications resulted in high VSS degradation efficiency of ca. 88%, as much as 1.3 times of methane production and more than 70% reduction in dewatered sludge cake production. Based on the performance, its energy demands and contribution for minimisation of greenhouse gas emission was evaluated throughout an entire study of sludge treatment and disposal schemes in a municipality for 130,000 p.e. The analysis indicated that the novel process with power generation from biogas would lead to minimal greenhouse gas emission because the extra energy production from the scheme was expected to cover all of the energy demand for the plant operation, and the remarkable reduction in dewatered sludge cake volumes makes it possible to reduce N2O discharge and consumption of fossil fuel in the subsequent sludge incineration processes.

Minimization of greenhouse gas emission by application of anaerobic digestion process with biogas utilization

2005 ◽  
Vol 52 (1-2) ◽  
pp. 545-552 ◽  
Author(s):  
H. Yasui ◽  
K. Komatsu ◽  
R. Goel ◽  
R. Matsuhashi ◽  
A. Ohashi ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Greenhouse Gas ◽  
Energy Demand ◽  
Greenhouse Gas Emission ◽  
Power Production ◽  
Pilot Scale ◽  
Gas Emission ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
The Impact

To assess the impact on greenhouse gas emission, different process schemes for municipal sludge treatment were evaluated based on the data from pilot-scale experiments and review of annual operation reports. A modified anaerobic digestion process with partial ozonation of digested sludge to improve biological degradability and the conventional anaerobic digestion process were compared with respect to the energy demand in each process schemes. Options for beneficial use of biogas included (1) application of biogas for power production and (2) recovery as an alternative to natural gas utilization. The analysis indicated that the partial ozonation process with power production led to minimal greenhouse gas emission because the extra energy production from this scheme was expected to cover all of the energy demand for the plant operation. Moreover, the final amount of dewatered sludge cake was only 40% of that expected from the conventional process, this significantly minimizes the potential for greenhouse gas emission in the subsequent sludge incineration processes.

Fate of nonylphenol polyethoxylates and nonylphenoxy acetic acids in an anaerobic digestion process for sewage sludge treatment

2006 ◽  
Vol 53 (11) ◽  
pp. 221-226 ◽  
Author(s):  
M. Minamiyama ◽  
S. Ochi ◽  
Y. Suzuki
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Treatment Process ◽  
Sludge Treatment ◽  
Testing Apparatus ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Sewage Sludge Treatment ◽  
Acetic Acids

Many environmental problems caused by endocrine disruptors (EDs) have been reported. It is reported that EDs flow into sewage treatment plants, and it has been pointed out that these may be shifted from the wastewater treatment process to the sludge treatment process. Little is known about the fate of EDs accumulated in sewage sludge, so we carried out a study to clarify the fate of EDs in sewage sludge treatment processes, especially in an anaerobic digestion process. In this study, nonylphenol (NP) was selected as a target ED. Nonylphenol ethoxylates (NPnEO) or nonylphenoxy acetic acids (NPnEC), which were the precursor of NP, were added to an anaerobic digestion process, and mass balance was investigated. The following results were obtained from the anaerobic digestion experiments. (1) NP1EO was injected to an anaerobic digestion testing apparatus that was operated at a retention time of approximately 28 d and a temperature of 35 °C with thickened sludge sampled from an actual wastewater treatment plant. Approximately 40% of the injected NP1EO was converted to NP. (2) NP1EC was injected to an anaerobic digestion testing apparatus with thickened sludge. As a result, almost all injected NP1EC was converted to NP. When NP2EC was injected, NP2EC was not converted to NP until the 20th day.

Full-scale application of anaerobic digestion process with partial ozonation of digested sludge

2005 ◽  
Vol 52 (1-2) ◽  
pp. 245-252 ◽  
Author(s):  
H. Yasui ◽  
K. Komatsu ◽  
R. Goel ◽  
Y. Y. Li ◽  
T. Noike
Keyword(s):  
Anaerobic Digestion ◽  
Full Scale ◽  
Digested Sludge ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
New Process ◽  
Sludge Cake ◽  
Dewatered Sludge ◽  
Solid Liquid ◽  
Solid Liquid Separation

For improving sludge digestion and biogas recovery, a new anaerobic digestion process combined with ozonation was tested at a full-scale unit for 2 years and its performance was compared with a simultaneously operated conventional anaerobic digestion process. The new process requires two essential modifications, which includes ozonation for enhancing the biological degradability of sludge organics and concentrating of solids in the digester through a solid/liquid separation for extension of SRT. These modifications resulted in high VSS degradation efficiency of ca. 88%, as much as 1.3 times of methane production and more than 70% reduction in dewatered sludge cake production. Owing to accumulation of inorganic solids in the digested sludge, water content of the dewatered sludge cake also reduced from 80% to 68%. An energy analysis suggested that no supplemental fuel was necessary for the subsequent incineration of the cake from the new process scheme. The process is suitable to apply to a low-loaded anaerobic digestion tank, where power production is used.

scholarly journals Role of wastewater sludge treatment by anaerobic stabilization for Rostovvodokanal company

2020 ◽  
pp. 50-55
Author(s):  
N. E. Gutorova ◽  
◽  
O. V. Dymnikova ◽  
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Wastewater Sludge ◽  
Problem Statement ◽  
Sludge Treatment ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Technological Line

Introduction. The article deals with the problems of treatment of organic sludge from the purification of municipal wastewater in Rostov-on-Don. To solve this problem, a method of anaerobic (methane) digestion of sewage sludge was proposed. Problem Statement. The objective of this study is to determine the role of anaerobic stabilization for Rostovvodokanal company. Theoretical Part. The differences between mesophilic and thermophilic modes of sediment digestion were determined, a technological line for preparing biogas for use was proposed. Calculations of the main parameters of the anaerobic digestion process in the digester have been made. Conclusion. The results of the analysis showed that with the help of this modernization, the main problems are solved.

Sign in / Sign up

Export Citation Format

Share Document