Dewatering mechanisms in pilot-scale Sludge Drying Reed Beds: Effect of design and operational parameters

2011 ◽  
Vol 172 (1) ◽  
pp. 430-443 ◽  
Author(s):  
Alexandros I. Stefanakis ◽  
Vassilios A. Tsihrintzis
Keyword(s):  
Pilot Scale ◽  
Operational Parameters ◽  
Reed Beds ◽  
Sludge Drying

Characteristics of Sludge Moisture Content Variation in Sludge Drying Reed Beds

2015 ◽  
Vol 768 ◽  
pp. 515-519
Author(s):  
Xin Nan Deng ◽  
Yu Bo Cui ◽  
Wei Gao ◽  
Rui Chen
Keyword(s):  
Moisture Content ◽  
Pilot Scale ◽  
Coarse Sand ◽  
Reed Beds ◽  
Conventional Drying ◽  
The Media ◽  
The Difference ◽  
Reed Bed ◽  
Sludge Drying ◽  
Media Layer

Sludge moisture content was investigated at different stages during the test. Pilot-scale sludge drying bed and sludge drying reed beds had the same size of 3 m×1 m×1.3 m, and the bed height consisted of a 65 cm media layer and a 65 cm extra height. The media layer is filled with slag (20 cm), gravel (20 cm), coarse sand (5 cm) and quartz sand (24.5 cm) from the bottom in turn. Unit 1 was a conventional sludge drying bed, unit 2 was a sludge drying reed bed. Unit 1 and unit 2 had ventilation pipes which were mounted on the drainage pipes. Unit 3 was a sludge drying reed bed without ventilation pipe. The waste activated sludge was feed into the three units periodically during the experiment. The experiment investigated the sludge moisture content. At the end of the operation, the sludge moisture content in three units decreased by 18.52%, 22.37%, and 20.68%, respectively. It was found that the dewatering effect of the sludge drying reed bed was better than the conventional drying bed. The effect of plant growth on sludge dewatering is greater than the ventilation, but the difference was not significant.

scholarly journals Treatment of septage in sludge drying reed beds: a case study on pilot-scale beds

2009 ◽  
Vol 60 (3) ◽  
pp. 643-653 ◽  
Author(s):  
S. Troesch ◽  
A. Liénard ◽  
P. Molle ◽  
G. Merlin ◽  
D. Esser
Keyword(s):  
Wastewater Treatment Plants ◽  
Bound Water ◽  
Pilot Scale ◽  
Simultaneous Treatment ◽  
Capillary Suction ◽  
Reed Beds ◽  
Operational Conditions ◽  
Rural Zone ◽  
Sludge Drying ◽  
Sanitation Systems

French legislation requires the control of private on-site sanitation systems by local authorities. This will result in a large increase of the quantity of sludge from septic tanks to be treated. Nevertheless, large wastewater treatment plants are not systematically able to treat this sludge because they may have reached their nominal load or they are not so numerous in rural zone to avoid too long transportation. The study concerns both the feasibility of sludge reed beds devoted to the treatment of septage and the assessment of a simultaneous treatment with aerated sludge. The experiments have been carried out on eight pilot-scale drying reed beds (2 m2) planted with Phragmites australis. Two filtration layers of either vegetal compost or sand were tested. The study is focused on the commissioning period (first vegetative year) with a loading rate of 30 kg SS m−2 yr−1. According to these operational conditions, dewatering efficiencies reached approx. 30% DM during summer but less than 20%DM in winter for each filtration layer and sludge. High removal efficiencies, with an average of 96%, 92% and 89% for SS, COD and TKN respectively, were achieved with septage whereas they were lower for the mixture of aerated sludge and septage. The dewaterability of septage and its filtration behaviour were assessed by several parameters (Capillary Suction Time, bound water) which may be some interesting tools for an optimised loading strategy.

Surplus activated sludge dewatering in pilot-scale sludge drying reed beds

2009 ◽  
Vol 172 (2-3) ◽  
pp. 1122-1130 ◽  
Author(s):  
A.I. Stefanakis ◽  
C.S. Akratos ◽  
P. Melidis ◽  
V.A. Tsihrintzis
Keyword(s):  
Activated Sludge ◽  
Pilot Scale ◽  
Sludge Dewatering ◽  
Reed Beds ◽  
Sludge Drying

Small wastewater treatment plants in Flanders (Belgium): standard approach and experiences with constructed reed beds

2000 ◽  
Vol 41 (1) ◽  
pp. 57-63 ◽  
Author(s):  
S. Vandaele ◽  
C. Thoeye ◽  
B. Van Eygen ◽  
G. De Gueldre
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Surface Flow ◽  
Limiting Factor ◽  
Vertical Flow ◽  
Reed Beds ◽  
Reed Bed

In Flanders (Belgium) an estimated 15% of the population will never be connected to a central wastewater treatment plant (WWTP). Small WWTPs can be a valuable option. Aquafin bases the decision to build SWWTPs on a drainage area study. To realise an accelerated construction the process choice is made accordingly to a standard matrix, which represents the different technologies in function of the size and the effluent consents. A pilot scale constructed two-stage reed bed is used to optimise the concept of the reed beds. The concept consists of a primary clarifier, two parallel vertical flow reed beds followed by a sub-surface flow reed bed. The removal efficiency of organic pollutants is high (COD: 89%, BOD: 98%). Phosphorus removal is high at the start-up but diminishes throughout the testing period (from 100% to 71% retention after 7 months). Nitrogen removal amounts to 53% on average. Nitrification is complete in summer. Denitrification appears to be the limiting factor. In autumn leakage of nitrogen is assumed. Removal efficiency of pathogens amounts to almost 99%. Clogging forms a substantial constraint of the vertical flow reed bed. Problems appear to be related with presettlement, feed interval and geotextile.

scholarly journals A Field Pilot Study on Treating Groundwater Contaminated with Sulfolane Using UV/H2O2

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1200 ◽  
Author(s):  
Linlong Yu ◽  
Sobhan Iranmanesh ◽  
Ian Keir ◽  
Gopal Achari
Keyword(s):  
Water Flow ◽  
Cost Model ◽  
Electrical Energy ◽  
Pilot Scale ◽  
Process Efficiency ◽  
Contaminated Groundwater ◽  
Operational Parameters ◽  
Flow Rates ◽  
Electrical Energy Per Order ◽  
H2o2 System

Sulfolane is an emerging contaminant in the groundwater and soil nearby gas plants, which has attracted much attention from many researchers and regulatory agencies in the past ten years. In this paper, a field pilot-scale ultraviolet (UV)/hydrogen peroxide (H2O2) system was investigated for treating sulfolane contaminated groundwater. Different groundwater, as well as different operational parameters such as influent sulfolane concentration, H2O2 dosage, and water flow rates, were studied. The results showed that a pilot-scale UV/H2O2 system can successfully treat sulfolane contaminated groundwater in the field, although the presence of iron and other groundwater limited the process efficiency. The lowest electrical energy per order of reduction for treating sulfolane in groundwater by using the pilot-scale UV/H2O2 system was 1.4 kWh m−3 order−1. The investigated sulfolane initial concentrations and the water flow rates did not impact the sulfolane degradation. The enhancement of sulfolane degradation in an open reservoir by adding ozone was not observed in this study. Furthermore, an operational cost model was formulated to optimize the dosage of H2O2, and a stepwise procedure was developed to determine the power necessary of the UV unit.

scholarly journals Full-scale performance of selected starch-based biodegradable polymers in sludge dewatering and recommendation for applications

2017 ◽  
Vol 77 (1) ◽  
pp. 7-16 ◽  
Author(s):  
Kuangxin Zhou ◽  
Johan Stüber ◽  
Rabea-Luisa Schubert ◽  
Christian Kabbe ◽  
Matthias Barjenbruch
Keyword(s):  
Biodegradable Polymers ◽  
Wastewater Treatment Plants ◽  
Pilot Scale ◽  
Full Scale ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Operational Parameters ◽  
Sludge Dewatering ◽  
Dewatered Sludge ◽  
Green Polymers

Abstract Agricultural reuse of dewatered sludge is a valid route for sludge valorization for small and mid-size wastewater treatment plants (WWTPs) due to the direct utilization of nutrients. A more stringent of German fertilizer ordinance requires the degradation of 20% of the synthetic additives like polymeric substance within two years, which came into force on 1 January 2017. This study assessed the use of starch-based polymers for full-scale dewatering of municipal sewage sludge. The laboratory-scale and pilot-scale trials paved the way for full-scale trials at three WWTPs in Germany. The general feasibility of applying starch-based ‘green’ polymers in full-scale centrifugation was demonstrated. Depending on the sludge type and the process used, the substitution potential was up to 70%. Substitution of 20–30% of the polyacrylamide (PAM)-based polymer was shown to achieve similar total solids (TS) of the dewatered sludge. Optimization of operational parameters as well as machinery set up in WWTPs is recommended in order to improve the shear stability force of sludge flocs and to achieve higher substitution potential. This study suggests that starch-based biodegradable polymers have great potential as alternatives to synthetic polymers in sludge dewatering.

Multistage treatment wetland for treatment of reject waters from digested sludge dewatering

2013 ◽  
Vol 68 (6) ◽  
pp. 1223-1232 ◽  
Author(s):  
M. Gajewska ◽  
H. Obarska-Pempkowiak
Keyword(s):  
High Efficiency ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Nitrogen Compounds ◽  
High Concentration ◽  
Treatment Wetland ◽  
Sludge Dewatering ◽  
Digested Sludge ◽  
Reed Beds ◽  
Colloidal Fraction

The paper presents the influence of sewage composition on treatment in pilot-scale facility for reject waters (RW) from sewage sludge centrifugation. The facility consisted of mechanical (two tanks with 10 d retention each) and biological parts composed of three subsurface flow reed beds working in batch. Two years of monitoring of the facility proved high efficiency removal of predominant pollutants: chemical oxygen demand (COD) 75–80%, biochemical oxygen demand (BOD) 82.2–95.5% and total nitrogen 78.7–93.9% for low ratio of BOD5/COD in discharged RW. The differences in efficiency removal were correlated with the composition of organics and nitrogen compounds rather than with concentrations. It was assumed that high concentration of colloidal fraction of Org-N and COD in discharged RW led to a decrease in efficiency removal.

Long-term studies on hybrid ceramic microfiltration for treatment of surface water containing high dissolved organic matter

2013 ◽  
Vol 14 (2) ◽  
pp. 246-254 ◽  
Author(s):  
A. Abeynayaka ◽  
C. Visvanathan ◽  
S. Khandarith ◽  
T. Hashimoto ◽  
H. Katayama ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Transmembrane Pressure ◽  
Raw Water ◽  
Operational Parameters ◽  
Polyaluminum Chloride ◽  
Filtration Cycle

This long-term pilot-scale study on the performance of ceramic microfiltration (CMF) was conducted at the Bangkhen water treatment plant (BWTP), with the raw water from Chaophraya River, Thailand. Raw water turbidity and dissolved organic carbon (DOC) were varied in the ranges of 20–210 NTU and 3.0–8.5 mg/L respectively. The hybrid pilot-scale CMF (Pilot-CMF) operational parameters were optimized with the aid of jar-tests and laboratory-scale CMF (Lab-CMF) operations. The systems were operated with various polyaluminum chloride dosages and filtration cycle times. Pilot-CMF provided excellent steady turbidity removal compared to the conventional water treatment process. DOC removal percentages of Pilot-CMF and the conventional process at the BWTP were 49% and 30% respectively. With different coagulant dosages, unique patterns in transmembrane pressure (TMP) variations were observed. The daily TMP increment under low turbidity conditions was 0.08 kPa/day. During rainy periods (turbidity over 100 NTU) the TMP increment reached 0.79 kPa/day. However, once the turbidity of raw water reaches normal conditions (30–60 NTU at the BWTP) the Pilot-CMF system recovers the TMP increment due to efficient backwashing.

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