scholarly journals Application of Ultrasound waves for Sludge Dewatering

2015 ◽  
Vol 9 (4) ◽  
pp. 6-9
Author(s):  
Farshad Golbabaei Kootenaei ◽  
Naser Mehrdadi ◽  
Gholamreza Nabi Bidhendi ◽  
Hasan Amini Rad
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Ease Of Use ◽  
Biological Processes ◽  
Complex Materials ◽  
Sludge Dewatering ◽  
Ultrasound Waves ◽  
Secondary Pollution ◽  
Increase Rate

Because of increase in application of biological processes in wastewater treatment plants the amount of sludge produced by them is increasing rapidly. Therefore finding new sludge reduction technologies in wastewater treatment plants is very important. Nowadays ultrasound waves have an increase rate of application in full scale in wastewater industry. The most important advantages of ultrasound waves are such as: No sludge production, ease of use, increasing the biogas production, contributing to dewatering, no secondary pollution and degradation of complex materials into simpler substances. In this research, different applications of ultrasound waves in wastewater and sludge treatment and improving dewaterabilty of sludge is investigated.DOI: http://dx.doi.org/10.3126/ijls.v9i4.12680

Improving the effluent of small wastewater treatment plants by bacteria reduction and nutrient removal with an algal biofilm

2003 ◽  
Vol 48 (2) ◽  
pp. 373-380 ◽  
Author(s):  
G. Schumacher ◽  
I. Sekoulov
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
High Potential ◽  
High Quality ◽  
Secondary Pollution ◽  
Algal Biofilm ◽  
Biofilm Process ◽  
Suspended Algae

In wastewater ponds, bacteria numbers decrease considerably in the case of raised algae concentrations in the effluent. This shows that algae have a high potential for bacteria reduction in wastewater. Simultaneously, algae remove nutrients from the water for the formation of biomass. However, suspended algae also cause a high secondary pollution in the effluent of wastewater treatment plants. By using attached algae, as they are frequently observed as an algal biofilm in the effluent of wastewater treatment plants, the problem of separation of algae and water can be avoided. Furthermore, the algae can be removed simply from the water. In this study the possibilities for bacteria reduction and nutrient removal were examined with the aid of an algal biofilm. The results show that an algal biofilm process can be used for cases where small amounts of wastewater should be treated and a high quality of the effluent should be attained.

scholarly journals MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

2020 ◽  
Vol 10 (8) ◽  
pp. 2921 ◽  
Author(s):  
Mohsen Parchami ◽  
Steven Wainaina ◽  
Amir Mahboubi ◽  
David I’Ons ◽  
Mohammad J. Taherzadeh
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Food Waste ◽  
Volatile Fatty Acids ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Economic Assessment ◽  
Ph Control ◽  
Daily Basis ◽  
Solids Concentration

The significant amount of excess sewage sludge (ESS) generated on a daily basis by wastewater treatment plants (WWTPs) is mainly subjected to biogas production, as for other organic waste streams such as food waste slurry (FWS). However, these organic wastes can be further valorized by production of volatile fatty acids (VFAs) that have various applications such as the application as an external carbon source for the denitrification stage at a WWTP. In this study, an immersed membrane bioreactor set-up was proposed for the stable production and in situ recovery of clarified VFAs from ESS and FWS. The VFAs yields from ESS and FWS reached 0.38 and 0.34 gVFA/gVSadded, respectively, during a three-month operation period without pH control. The average flux during the stable VFAs production phase with the ESS was 5.53 L/m2/h while 16.18 L/m2/h was attained with FWS. Moreover, minimal flux deterioration was observed even during operation at maximum suspended solids concentration of 32 g/L, implying that the membrane bioreactors could potentially guarantee the required volumetric productivities. In addition, the techno-economic assessment of retrofitting the membrane-assisted VFAs production process in an actual WWTP estimated savings of up to 140 €/h for replacing 300 kg/h of methanol with VFAs.

Carbon footprints of Scandinavian wastewater treatment plants

2013 ◽  
Vol 68 (4) ◽  
pp. 887-893 ◽  
Author(s):  
D. J. I. Gustavsson ◽  
S. Tumlin
Keyword(s):  
Wastewater Treatment ◽  
Carbon Footprint ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Municipal Wastewater Treatment ◽  
Carbon Footprints ◽  
Fossil Carbon

This study estimates the carbon footprints of 16 municipal wastewater treatment plants (WWTPs), all situated in Scandinavian countries, by using a simple model. The carbon footprint calculations were based on operational data, literature emission factors (efs) and measurements of greenhouse gas emissions at some of the studied WWTPs. No carbon neutral WWTPs were found. The carbon footprints ranged between 7 and 108 kg CO2e P.E.−1 year−1. Generally, the major positive contributors to the carbon footprint were direct emissions of nitrous oxide from wastewater treatment. Whether heat pumps for effluents have high coefficient of performance or not is extremely important for the carbon footprint. The choice of efs largely influenced the carbon footprint. Increased biogas production, efficient biogas usage, and decreased addition of external fossil carbon source for denitrification are important activities to decrease the carbon footprint of a WWTP.

scholarly journals Advanced Wastewater Treatment to Eliminate Organic Micropollutants in Wastewater Treatment Plants in Combination with Energy-Efficient Electrolysis at WWTP Mainz

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3599 ◽  
Author(s):  
Oliver Gretzschel ◽  
Michael Schäfer ◽  
Heidrun Steinmetz ◽  
Erich Pick ◽  
Kim Kanitz ◽  
...  
Keyword(s):  
Water Management ◽  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Automatic Frequency ◽  
Municipal Wastewater Treatment ◽  
Organic Micropollutants ◽  
Micropollutant Removal

To achieve the Paris climate protection goals there is an urgent need for action in the energy sector. Innovative concepts in the fields of short-term flexibility, long-term energy storage and energy conversion are required to defossilize all sectors by 2040. Water management is already involved in this field with biogas production and power generation and partly with using flexibility options. However, further steps are possible. Additionally, from a water management perspective, the elimination of organic micropollutants (OMP) is increasingly important. In this feasibility study a concept is presented, reacting to energy surplus and deficits from the energy grid and thus providing the needed long-term storage in combination with the elimination of OMP in municipal wastewater treatment plants (WWTPs). The concept is based on the operation of an electrolyzer, driven by local power production on the plant (photovoltaic (PV), combined heat and power plant (CHP)-units) as well as renewable energy from the grid (to offer system service: automatic frequency restoration reserve (aFRR)), to produce hydrogen and oxygen. Hydrogen is fed into the local gas grid and oxygen used for micropollutant removal via upgrading it to ozone. The feasibility of such a concept was examined for the WWTP in Mainz (Germany). It has been shown that despite partially unfavorable boundary conditions concerning renewable surplus energy in the grid, implementing electrolysis operated with regenerative energy in combination with micropollutant removal using ozonation and activated carbon filter is a reasonable and sustainable option for both, the climate and water protection.

Optimizing Polymer Consumption in Sludge Dewatering Applications

1990 ◽  
Vol 22 (7-8) ◽  
pp. 261-267
Author(s):  
P. M. Crawford
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Operating Performance ◽  
Water Systems ◽  
Full Scale ◽  
Sludge Dewatering ◽  
The Past ◽  
Sludge Conditioning ◽  
Original Objective ◽  
Device Operation

As we move into the 1990's, upgrading of existing wastewater treatment plants is becoming a very important consideration. Although upgrading can take many forms, one of the most economic is to optimize the performance of the existing equipment and structures. In the realm of sludge dewatering, also an increasingly important topic, an area which has received little attention in the past is the control of the sludge conditioning process prior to dewatering. In conjunction with the Wastewater Technology Centre in Burlington, Canada, ZENON Water Systems Inc. has developed the Sludge Conditioning Controller (SCC) to fulfill this need in the wastewater marketplace. A description of both the hardware and software aspects of the SCC are presented. In addition, typical operating performance of the microprocessor-based system is shown. Experience with full scale systems has revealed that the benefits associated with the SCC far exceed the original objective of saving polymer. The others include automation of the dewatering device operation, increased capacity, and more uniform performance of the dewatering machine.

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