Hydrogen sulphide and volatile fatty acid removal from foul air in a fibrous bed bioreactor

1998 ◽  
Vol 38 (3) ◽  
pp. 323-329 ◽  
Author(s):  
X. Z. Li ◽  
J. S. Wu ◽  
D. L. Sun
Keyword(s):  
Wastewater Treatment ◽  
Butyric Acid ◽  
Hydrogen Sulphide ◽  
Water Solution ◽  
Operating Cost ◽  
Treatment Plant ◽  
Airflow Rate ◽  
Sulphate Content ◽  
Gas Treatment ◽  
Fibrous Bed Bioreactor

Odour control in Hong Kong has been addressed as an important issue by the authorities, since odour pollution is generated from many sources including wastewater treatment plants. Although a number of existing technologies are available for odour abatement and control, biological technique is still more attractive due to its low operating cost and ease of maintenance. A newly innovated fibrous bed bioreactor with twin columns was specially designed and constructed in our laboratory, in which an inner column was centred in an outer column. The bioreactor was fully filled with water in order to absorb the odorous components from foul gas and also contained both suspended and attached biomass to degrade the absorbed odorous pollutants. In this study, hydrogen sulphide (H2S) and butyric acid (C4H8O2) were used as odorous components and successfully removed from synthetic foul gases. Many factors affecting the H2S and butyric acid removal efficiency and maximum elimination capacity, such as pH of water solution, gas flow rate and its fluctuation, and sulphate content in solution have been studied. The experimental results demonstrated that the reduction rates of 97.8% for H2S and 99.9% for butyric acid were achieved in this experimental condition. It is proved that this bioreactor was a compact odorous gas treatment system with an application potential for treating foul air with high odour strength and low airflow rate such as the offensive gases from sludge treatment processes in a wastewater treatment plant.

Energy Saving Technologies for Wastewaters Treatment with Application of Utilization Gas-Turbine Units

2017 ◽  
Vol 6 (1) ◽  
pp. 58-65
Author(s):  
Тумашев ◽  
R. Tumashev ◽  
Щеголев ◽  
N. Schegolev ◽  
Назаревич ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Gas Turbine ◽  
Wastewater Treatment Plants ◽  
Operating Cost ◽  
Treatment Plant ◽  
Electrical Energy ◽  
Ecological Condition ◽  
Raw Material ◽  
Wastewaters Treatment

Improving the ecological condition of water basins is closely connected with reconstruction of systems for water disposal and wastewaters treatment. Modernization of old-fashioned wastewater treatment plants, and operating cost saving is possible by means of transition to effective technological solutions, including the process of substrate anaerobic digestion with production of biogas and raw material for high-quality fertilizers. Biogas can be used in power stations for production of thermal and electrical energy required for wastewater treatment plant needs. This energy also reduces the plant’s operating cost. A scheme of a module for anaerobic digestion has been proposed, and application of utilization cogeneration gas-turbine units with an external supply of warmth to cyclic air has been justified. Optimum parameters of utilization gas-turbine units have been determined. At air temperature in front of the turbine 1190 K the compression ratio in a cycle is equal to 4,2, electric efficiency — 0,313, the general one taking into account the developed warmth — 0,872. In some cases the gas-turbine unit can be manufactured without booster fuel compressor.

H2S and Mercaptane in Gas Production: Practical Operating Experience

2001 ◽  
Author(s):  
Tomislav Juranic ◽  
Ivan Meandzija ◽  
Ivo Steiner
Keyword(s):  
Natural Gas ◽  
Monitoring System ◽  
Operating Cost ◽  
Harmful Effect ◽  
Treatment Plant ◽  
Ambient Air ◽  
Elementary Sulfur ◽  
Continuous Control ◽  
Separation Unit ◽  
Gas Treatment

Abstract INA-Naftaplin has been utilizing the LO-CAT® process in Croatia for protection of ambient air against H2S pollution at its Gas Treatment Plant Molve III already for seven years. This separation unit, incorporated into the gas treatment plant has been erected exclusively for the protection of ambient air against harmful effect of H2S. The unit is treating H2S+CO2, which is being removed from natural gas by an upstream amine process, under conditions of low H2S content and low pressure of gas. Catalytic oxidation is being used to convert H2S to elementary sulfur, and the emission concentration was decreased from 580 ppm to less than 30 ppm. The practice revealed a series of delicate situations: plugging of internals, solution filtering and achievement of required 60 wt% sulfur concentration, disposal of produced sulfur sludge and others. The Institute for Medical Research Zagreb has performed the ambient air quality monitoring, within the scope of its contract for annual base monitoring. H2S imission values were under 5 μg/m3. The continuous control of working area is achieved by twenty-four H2S sensors, and results obtained to this date have always been below allowable limits. The practical experience has revealed that the LO-CAT® desulfurization unit has fulfiled its purpose and existing environmental criteria till 1997, along with significant cost, primarily for power and chemicals. The actual Croatian Directive on TLV of pollutants in the waste gas requires H2S concentration of 3.5 ppmv max. and RSH concentration of 20 mg/m3 max. Now the GTP Molve and Ethane Recovery Plant have emission of H2S and mercaptane above the permissible limit value, which have to be solved until the year 2004. To meet the strict legal requirements, certain upgrading is to be undertaken. This capital investment requires a large financial expenditure of up to 5 million USD, and up to 1 million USD/year for operating cost for both plants. For process improvement a continuous monitoring system has to be solved also. In that respect, measuring of H2S+RSH emission is in accordance to ASTM D-4084-82 and ASTM D-23 85-81 methods. Periodical control by gas tube detector system could contribute to the most reliable and efficient monitoring system of the two most important natural gas plants in Croatia.

scholarly journals Odour nuisance assessment of the food industry wastewater treatment plant

2019 ◽  
Vol 100 ◽  
pp. 00024
Author(s):  
Agnieszka Grzelka ◽  
Elżbieta Romanik ◽  
Urszula Miller
Keyword(s):  
Wastewater Treatment ◽  
Hydrogen Sulphide ◽  
Food Industry ◽  
Reference Model ◽  
Sewage Treatment ◽  
Detection Threshold ◽  
Treatment Plant ◽  
Model Calculations ◽  
Treatment Processes ◽  
Local Residents

Odour nuisance generated by food industry objects is a significant problem, the result of which is often numerous complaints from local residents about the quality of air. Apart from the production process, this problem often concerns industrial wastewater treatment processes, which contribute to a large extent to the emissions of odorants from the sulphur group, including hydrogen sulphide and mercaptans. In order to estimate the odorous air quality around these types of objects, the modelling of dispersion of pollutants: odours or odorants is often used. The paper presents the results of tests on odour emission as well as hydrogen sulphide and mercaptans emission as compounds typical for waste gases from the sewage treatment process from the food industry. In order to estimate the range of odour impact, model calculations using the Polish reference model for the aforementioned substances were made. The values of annual average concentrations and frequency of odour detection thresholds for odorants and odour concentration of 1 ouE/m3 for odours as a mixture in a computational grid of 1400 m x 1400 m with a step of 50 m were calculated. The results showed the highest range of odour impact of mercaptans, whose value of the average annual concentration exceeded the odour detection threshold up to 700 m in the east and west direction from the emission source.

Domestic wastewater treatment by real-scale electrocoagulation process

2020 ◽  
Vol 81 (4) ◽  
pp. 656-667 ◽  
Author(s):  
Serdar Koyuncu ◽  
Sema Arıman
Keyword(s):  
Wastewater Treatment ◽  
Operating Cost ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Urban Wastewater ◽  
Electrocoagulation Process ◽  
Removal Efficiencies ◽  
Urban Wastewater Treatment ◽  
Real Scale

Abstract In this study, domestic wastewaters originating from a settlement with a population of 17,500 were treated by electrocoagulation process in a real-scale EC plant and the economic applicability of the process was investigated. The removal efficiencies of control parameters in the influent and effluent of the real-scale treatment plant such as suspended solids (SS), biological oxygen demand (BOD), chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP) and changes of pH and conductivity parameters were monitored for 12 months. The obtained data were evaluated according to European Urban Wastewater Treatment Directive, Turkish Water Pollution Control Regulation and Turkish Urban Wastewater Treatment Regulation. According to the results obtained, the removal efficiencies of the pollutant parameters were achieved in the range of 72–83% for SS, 67–80% for COD, 69–81% for BOD, 21–47% for TN and 27–46% for TP. Considering the Turkish wastewater discharge regulations, it can be concluded that the discharge standards for SS, COD and BOD parameters were achieved while they were not achieved in certain periods for TN and TP. In addition, the energy consumption and the operating cost of this real-scale plant were determined to be 0.49–0.54 kWh/m3 and 0.24–0.28 EUR/m3, respectively.

Engineering Study on the Nutrient Removal Process of ECOSUNIDE

2011 ◽  
Vol 393-395 ◽  
pp. 1198-1202
Author(s):  
Yan Li ◽  
Na Meng
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Nutrient Removal ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Operating Cost ◽  
Treatment Plant ◽  
Simultaneous Nitrification And Denitrification ◽  
Municipal Wastewater Treatment ◽  
Engineering Study

ECOSUNIDE (ecological superior nitrification denitrification), based on the advanced theories including uniform dynamic, dynamic loading, sludge concentraion optimization, simultaneous nitrification and denitrification, etc., is characterized by high removal efficiency of COD, BOD, nutrient, short total detention period, low operating cost, etc. This process has been successfully applied in the Further Treatment Engineering in Luozhuang of Linyi. The effluent qualities meet the ClassⅠ-A Criteria Specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).

Biological prevention and removal of hydrogen sulphide in sludge at Lillehammer Wastewater Treatment Plant

2000 ◽  
Vol 41 (6) ◽  
pp. 175-187 ◽  
Author(s):  
A. M. Einarsen ◽  
A. Æsøy ◽  
A-I. Rasmussen ◽  
S. Bungum ◽  
M. Sveberg
Keyword(s):  
Wastewater Treatment ◽  
Working Conditions ◽  
Nitrogen Removal ◽  
Hydrogen Sulphide ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Cost Benefit ◽  
Working Environment ◽  
Sludge Treatment ◽  
Biological Prevention

Formation of H2S and other odorous compounds in sludge can be prevented efficiently by controlled dosage of nitrate. Lillehammer WWTP (N) had problems with malodour that originated mainly from the sludge treatment. Highlevels of H2S caused poor working conditions, and resulted in an overloaded hypochlorite scrubber. In addition, neighbours were complaining. Controlled dosing was necessary to avoid increased loads on the nitrogen removal process and floating sludge in the thickener, and to keep the H2S concentration and chemical costs low. This resulted in considerably better working environment and eliminated complaints from neighbours. A cost-benefit for Nutriox® Septicity Control has been performed.

Plant-wide (BSM2) evaluation of reject water treatment with a SHARON-Anammox process

2006 ◽  
Vol 54 (8) ◽  
pp. 93-100 ◽  
Author(s):  
E.I.P. Volcke ◽  
K.V. Gernaey ◽  
D. Vrecko ◽  
U. Jeppsson ◽  
M.C.M. van Loosdrecht ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Operating Cost ◽  
Treatment Plant ◽  
Cost Index ◽  
Reject Water ◽  
The Impact ◽  
Anammox Process

In wastewater treatment plants (WWTPs) equipped with sludge digestion and dewatering systems, the reject water originating from these facilities contributes significantly to the nitrogen load of the activated sludge tanks, to which it is typically recycled. In this paper, the impact of reject water streams on the performance of a WWTP is assessed in a simulation study, using the Benchmark Simulation Model no. 2 (BSM2), that includes the processes describing sludge treatment and in this way allows for plant-wide evaluation. Comparison of performance of a WWTP without reject water with a WWTP where reject water is recycled to the primary clarifier, i.e. the BSM2 plant, shows that the ammonium load of the influent to the primary clarifier is 28% higher in the case of reject water recycling. This results in violation of the effluent total nitrogen limit. In order to relieve the main wastewater treatment plant, reject water treatment with a combined SHARON-Anammox process seems a promising option. The simulation results indicate that significant improvements of the effluent quality of the main wastewater treatment plant can be realized. An economic evaluation of the different scenarios is performed using an Operating Cost Index (OCI).

scholarly journals Methodology for Optimizing Sewage Sludge Treatment, Valorization and Disposal Methods. Application to the Marrakech (Morocco) Wastewater Treatment Plant

2020 ◽  
Vol 9 (4) ◽  
pp. 305-318
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Mathematical Formulation ◽  
Operating Cost ◽  
Treatment Plant ◽  
Optimal Solution ◽  
Sludge Management ◽  
Optimal Method ◽  
Sludge Treatment ◽  
Support Tool

Wastewater treatment leads to a significant production of about 150 to 200 kg of sludge per population equivalent (P.E) per year, with a humidity level higher than 90%. The treatment and discharge of this sludge involves high costs for wastewater treatment plants (WWTPs), which can amount to up to 60% of their total operating cost. The environmental and public health aspect should also be carefully considered during evacuation as sludge may contain harmful elements. Currently, several treatment, valorization and disposal methods are possible for sludge. In order to respect the various constraints on the possibilities of discharging sludge and to minimize its cost, a reasonable approach must be followed to establish an optimal management path according to the WWTP situation. The objective of this work is to develop a methodology for optimizing sludge treatment, valorization and disposal methods for a given WWTP. This method is based on operational research technique. The methodology follows the following six steps: description of the existing situation, identification of possible treatment, valorization and disposal methods for the WWTP and development of a decision tree specific to the WWTP, mathematical formulation and assumptions, mathematical resolution and sensitivity analysis, validation of the solution and application of the solution. After the application of this methodology, a decision support tool is developed to define the optimal method(s) for sludge management in the WWTP. According to the example of the application of this methodology on sludge management of the WWTP of Marrakech (Morocco), the optimal solution, with respect to the data used and keeping the installations in place, is the application of agricultural spreading after the sludge treatments which are: thickening, anaerobic digestion, mechanical dehydration and solar drying. On a 20-year operation, an average gain of about €10 (110 DHs) per ton of dry solid (DS) incoming is generated.

Sign in / Sign up

Export Citation Format

Share Document