The possibility of using encapsulated nitrifiers for treatment of reject water coming from anaerobic digestion

2012 ◽  
Vol 65 (8) ◽  
pp. 1428-1434 ◽  
Author(s):  
L. Vacková ◽  
R. Stloukal ◽  
J. Wanner
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Synthetic Wastewater ◽  
Reject Water ◽  
Batch Tests ◽  
Plant Optimization ◽  
Nitrogen Concentrations

Large wastewater treatment plants have to deal not only with the influent wastewater, but also with the highly concentrated reject water coming from anaerobic digestion. The aim of this work was to verify the suitability of using encapsulated nitrifiers in polyvinyl alcohol carrier (so called Lentikats Biocatalyst) at temperatures between 5 and 30 °C. For laboratory nitrification batch tests synthetic wastewater with ammonia nitrogen (Namon) concentration 10–800 mg L−1 was used. The system has been proved to operate at the temperature of 10 °C, but not at 5 °C. It was found that the highest specific nitrification rates were observed at 30 °C and with ammonia nitrogen concentrations above 250 mg L−1, which means that separate treatment of reject water by using encapsulated biomass seems to be an effective tool for wastewater treatment plant optimization.

A study of the digestion process of sewage sludge from a dairy wastewater treatment plant to determine the composition and load of reject water

2014 ◽  
Vol 9 (1) ◽  
pp. 71-78 ◽  
Author(s):  
W. Da˛browski
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Research Work ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Dairy Wastewater ◽  
High Concentration ◽  
Reject Water

The issue of reject water has to be considered in almost every biological municipal or industrial wastewater treatment plant (WWTP) that applies aerobic or anaerobic digestion of sewage sludge. Reject water is usually returned to the beginning of the treatment process, which results in periodical disturbances in stable and efficient sewage treatment. Due to planned modernization of one of the biggest dairy WWTPs in Poland, a laboratory scale research has been carried out to determine quality characteristics of reject water. Aerobic and anaerobic digestion was applied to a mixture of two kinds of sludge: excessive and flotation. According to research performed by the author results (range value) of reject water were: 7.3 to 12.9 mg N-NH4/L after aerobic and 460.0 to 574.0 mg N-NH4/L after anaerobic digestion. The study has confirmed a higher value of organic substances in reject water after anaerobic digestion in comparison with aerobic. Due to high concentration of ammonia nitrogen in reject water obtained during co-digestion of excessive and flotation sludge, a separated system for its treatment should be applied. The results of research work presented in this paper provided a base for the project of the pilot installation with constructed wetland.

Sludge minimization by disintegration at different wastewater treatment plants

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Luchien Luning ◽  
Paul Roeleveld ◽  
Victor W.M. Claessen
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
New Technologies ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Biological Degradation ◽  
Ongoing Research ◽  
Sludge Minimization

In recent years new technologies have been developed to improve the biological degradation of sewage sludge by anaerobic digestion. The paper describes the results of a demonstration of ultrasonic disintegration on the Dutch Wastewater Treatment Plant (WWTP) Land van Cuijk. The effect on the degradation of organic matter is presented, together with the effect on the dewatering characteristics. Recommendations are presented for establishing research conditions in which the effect of sludge disintegration can be determined in a more direct way that is less sensitive to changing conditions in the operation of the WWTP. These recommendations have been implemented in the ongoing research in the Netherlands supported by the National Institute for wastewater research (STOWA).

Use of modelling for optimization and upgrade of a tropical wastewater treatment plant in a developing country

2007 ◽  
Vol 56 (7) ◽  
pp. 21-31 ◽  
Author(s):  
D. Brdjanovic ◽  
M. Mithaiwala ◽  
M.S. Moussa ◽  
G. Amy ◽  
M.C.M. van Loosdrecht
Keyword(s):  
Wastewater Treatment ◽  
Developing Country ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Coupled Model ◽  
Reject Water ◽  
Complex Interactions ◽  
N Removal ◽  
Discharge Criteria

This paper presents results of a novel application of coupling the Activated Sludge Model No. 3 (ASM3) and the Anaerobic Digestion Model No.1 (ADM1) to assess a tropical wastewater treatment plant in a developing country (Surat, India). In general, the coupled model was very capable of predicting current plant operation. The model proved to be a useful tool in investigating various scenarios for optimising treatment performance under present conditions and examination of upgrade options to meet stricter and upcoming effluent discharge criteria regarding N removal. It appears that use of plant-wide modelling of wastewater treatment plants is a promising approach towards addressing often complex interactions within the plant itself. It can also create an enabling environment for the implementations of the novel side processes for treatment of nutrient-rich, side-streams (reject water) from sludge treatment.

Joint Consideration of Combined Sewerage and Wastewater Treatment Plants

1992 ◽  
Vol 26 (5-6) ◽  
pp. 1125-1134 ◽  
Author(s):  
A. Durchschlag ◽  
L. Härtel ◽  
P. Hartwig ◽  
M. Kaselow ◽  
D. Kollatsch ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Dynamic Models ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Storage Tanks ◽  
Combined Sewer Overflows ◽  
Pollutant Loads ◽  
Water Flows ◽  
Catchment Areas

Wastewater treatment plants, combined sewerage, catchment areas, storage tanks and overflows have to be regarded together. Stormwater runoff results in discharges at combined sewer overflows and higher pollutant loads in the effluent of the treatment plants. Characteristics of catchment areas and sewerage, number and capacity of storage tanks and overflows determine the characteristics of the combined water influent of the treatment plant. The plant has to cope with a higher hydraulic load and often with higher pollutant loads at the beginning of combined water flows. Some of the effects are displacement of sludge to the secondary clarifier, higher solids concentrations in the effluent and high loads of ammonia nitrogen for the nitrifying reactor. To decide on bigger stormwater storages or improvement of the treatment plant all effects in the whole system have to be considered. This can only be done with dynamic models, although simulation of combined water flows still have to be improved.

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.

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 Particle balance and return loops for microplastics in a tertiary-level wastewater treatment plant

2021 ◽  
Author(s):  
Pauliina Salmi ◽  
Kalle Ryymin ◽  
Anna K. Karjalainen ◽  
Anna Mikola ◽  
Emilia Uurasjärvi ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Wastewater Sludge ◽  
Tertiary Level ◽  
Sludge Treatment ◽  
Reject Water ◽  
Exit Route ◽  
Sampling Campaign ◽  
The One

Abstract Microplastics (MPs) from households, stormwater, and various industries are transported to wastewater treatment plants (WWTPs), where a high proportion of them are captured before discharging their residuals to watersheds. Although recent studies have indicated that the removed MPs are mainly retained in wastewater sludge, sludge treatment processes have gained less attention in MP research than water streams at primary, secondary, and tertiary treatments. In this study, we sampled twelve different process steps in a tertiary-level municipal WWTP in central Finland. Our results showed that, compared to the plant influent load, three times more MPs circulated via reject water from the sludge centrifugation back to the beginning of the treatment process. Especially fibrous MPs were abundant in the dewatered sludge, whereas fragment-like MPs were observed in an aqueous stream. We concluded that, compared to the tertiary effluent, sludge treatment is the major exit route for MPs into the environment, but sludge treatment is also a return loop to the beginning of the process. Our sampling campaign also demonstrated that WWTPs with varying hydraulic conditions (such as the one studied here) benefit from disc filter–based tertiary treatments in MP removal.

scholarly journals Energy saving in wastewater treatment plants

2020 ◽  
Vol 212 ◽  
pp. 01003
Author(s):  
Natalia Ciobanu
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Wastewater Treatment Plant ◽  
Energy Recovery ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Electricity Consumption ◽  
Electricity Cost ◽  
Starting Point ◽  
Sludge Cake

This paper uses data from the Chisinau Wastewater Treatment Plant (WWTP) (2018 year) to analyze the potential for energy recovery from wastewater treatment plant via anaerobic digestion with biogas utilization with electricity generation. These energy recovery strategies could help offset the electricity consumption of the wastewater treatment plants and represent possible areas for sustainable energy policy implementation. We estimate that anaerobic digestion could save approximately 14, 444, 918 kWh annually in Chisinau WWTP. Anaerobic digestion is widely considered as an environmentally friendly technology for sewerage sludge. This study aims to highlight the potential as well as to provide a starting point for further studies regarding the treatment as sewerage sludge using anaerobic digestion in Republic of Moldova and recovery energy that could further reduce electricity cost and reduction of sludge cake.

scholarly journals Bioelectrochemical CO2 Reduction to Methane: MES Integration in Biogas Production Processes

2019 ◽  
Vol 9 (6) ◽  
pp. 1056 ◽  
Author(s):  
Anirudh Nelabhotla ◽  
Carlos Dinamarca
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Treatment Plant ◽  
Co2 Reduction ◽  
Open Circuit ◽  
Biogas Yield ◽  
Reject Water ◽  
Novel Approach ◽  
Efficiency And Productivity

Anaerobic digestion (AD) is a widely used technique to treat organic waste and produce biogas. This article presents a practical approach to increase biogas yield of an AD system using a microbial electrosynthesis system (MES). The biocathode in MES reduces carbon dioxide with the supplied electrons and protons (H+) to form methane. We demonstrate that the MES is able to produce biogas with over 90% methane when fed with reject water obtained from a local wastewater treatment plant. The optimised cathode potential was observed in the range of −0.70 V to −0.60 V and optimised feed pH was around 7.0. With autoclaved feed, these conditions allowed methane yields of about 9.05 mmol/L(reactor)-day. A control experiment was then carried out to make a comparison between open circuit and MES methanogenesis. The highest methane yield of about 22.1 mmol/L(reactor)-day was obtained during MES operation that performed 10–15% better than the open circuit mode of operation. We suggest and describe an integrated AD-MES system, by installing MES in the reject water loop, as a novel approach to improve the efficiency and productivity of existing waste/wastewater treatment plants.

External and internal sources which inhibit the nitrification process in wastewater treatment plants

1996 ◽  
Vol 33 (6) ◽  
pp. 57-66 ◽  
Author(s):  
O. Sinkjær ◽  
P. Bøgebjerg ◽  
H. Gruüttner ◽  
P. Harremoës ◽  
K. F. Jensen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Internal Source ◽  
Long Term Effects ◽  
Batch Tests ◽  
Sludge Incineration ◽  
Catchment Areas ◽  
Nitrification Process ◽  
External Sources

In connection with the upgrading of the two largest wastewater treatment plants in the Copenhagen area to nutrient removal special attention has been paid to the nitrification process regarding inhibition effects. Inhibitory substances in the wastewater could be identified by simple batch tests, and the long-term effects on the nitrification process were tested in pilot plants or at full-scale. A distinction could be made between effects produced by wastewater from external sources in the catchment area and internally circulated flows in the wastewater treatment plant. Results from programmes monitoring the influent to the Lynetten WWTP and the Damhusåen WWTP and the catchment areas have revealed that discharges from industries are to be considered the most important external sources of inhibition. The load from the external sources has decreased during the investigation period, and since 1993 the nitrification capacity monitored at the pilot plants has been in agreement with the design basis. The recycling of the scrubber water from the cleaning of sludge incineration flue gas was found to be an important internal source of inhibition at the Lynetten WWTP. Investigations show that it is possible to reduce the effect by modifying the existing incineration process and, if necessary, combining it with separate treatment.

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