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

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.

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.

Understanding Mechanisms of Synergy between Acidification and Ultrasound Treatments for Activated Sludge Dewatering: From Bench to Pilot–Scale Investigation

2018 ◽  
Vol 52 (7) ◽  
pp. 4313-4323 ◽  
Author(s):  
Mei-Qiang Cai ◽  
Jian-Qiang Hu ◽  
George Wells ◽  
Youngwoo Seo ◽  
Richard Spinney ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Pilot Scale ◽  
Sludge Dewatering

scholarly journals Correction to Understanding Mechanisms of Synergy between Acidification and Ultrasound Treatments for Activated Sludge Dewatering: From Bench to Pilot-Scale Investigation

2018 ◽  
Vol 52 (10) ◽  
pp. 6077-6077 ◽  
Author(s):  
Meiqiang Cai ◽  
Jianqiang Hu ◽  
George Wells ◽  
Youngwoo Seo ◽  
Richard Spinney ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Pilot Scale ◽  
Sludge Dewatering

Application of activated sludge and biofilm sequencing batch reactor technology to treat reject water from sludge dewatering systems: a comparison

2000 ◽  
Vol 41 (1) ◽  
pp. 115-122 ◽  
Author(s):  
E. Arnold ◽  
B. Böhm ◽  
P.A. Wilderer
Keyword(s):  
Activated Sludge ◽  
Sequencing Batch Reactor ◽  
Early Stage ◽  
Batch Reactor ◽  
Ph Control ◽  
Pilot Scale ◽  
Main Stream ◽  
Sludge Dewatering ◽  
Reject Water ◽  
Side Stream

Side stream reactors to treat reject water from sludge dewatering facilities may be considered to be small treatment plants embedded in large ones. Combination of main stream and side stream treatment provides a number of advantages. Of major importance is that tailored processes can be employed for the two waste streams very different in composition and concentration. Pilot scale experiments were conducted to study the applicability, and to compare the performance of two types of Sequencing Batch Reactor (SBR) systems, an activated sludge and a biofilm SBR. The reactors were operated to achieve nitrification only. Subsequently, the effluent of the reactors is fed into the anoxic zone of the main stream activated sludge plant to achieve denitrification. In general it can be stated that both, activated sludge and biofilm SBR systems are applicable for treating reject water of high ammonia loading. Nitrogen removal efficiencies of more than 90% could be obtained with both systems. If complete nitrification without denitrification is to be achieved, pH control is necessary. However, the amount of sodium hydroxide required for adjusting the pH during nitrification is significant. Foam development and accumulation caused major problems, especially during the early stage of start up. But the time proceeding, and by changing the type of polyelectrolyte used in the sludge dewatering process foam problems could be kept under control.

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.

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