Pilot-scale water hyacinth bed for dewatering of sewage sludge

2020 ◽  
Vol 194 ◽  
pp. 450-458
Author(s):  
A.S. El-Gendy ◽  
A.G. Ahmed
Keyword(s):  
Sewage Sludge ◽  
Water Hyacinth ◽  
Pilot Scale

Vermicomposting of sewage sludge: a new technology for Mexico

2002 ◽  
Vol 46 (10) ◽  
pp. 153-158 ◽  
Author(s):  
L. Cardosa Vigueros ◽  
E. Ramírez Camperos
Keyword(s):  
Sewage Sludge ◽  
Water Hyacinth ◽  
New Technology ◽  
Pilot Scale ◽  
Exchange Capacity ◽  
Fecal Coliforms ◽  
High Concentration ◽  
Cocoon Production ◽  
Cationic Exchange ◽  
Restricted Use

In Mexico 31% of the treatment plants have a flow less than 60 l/s. This study offers a simple and economical alternative through vermicomposting to resolve the management of sewage sludge and water hyacinth for these small treatment plants. This study was developed with laboratory and pilot scale systems. In the laboratory Eisenia foetida survival was quantified. They were fed three doses of sludge and water hyacinth and different percentages of humidity were applied. The production of worm cocoons was quantified as biomass production and the reduction in the TV/STS ratio as an indicator of stability. To install the pilot system the mixture with the highest cocoon production was chosen. In the pilot test the effect of the worm population density on the waste degradation was observed, the experiment was divided into five modules, four with densities from 2.5 to 15 kg/m2 and one module without worms that served as a blank test. Results: the best mixture was 70% sewage sludge and 30% water hyacinth, with 80% humidity and an average production of 298 cocoons/kg of vermicompost. There were no significant differences in the TVS/TS reduction between the different modules with worms, but in the blank test module there was no reduction. The Type A vermicompost obtained, with non-restricted use, 900 fecal coliforms NMP/g, 0.0 helminth ova/g, highly organic (60% M.O.), high concentration of total nitrogen (2.5%), phosphorus (0.96%) and cationic exchange capacity (60.2 meq/100 g), which indicates that soil fertility would increase if used in agriculture.

Pig Wastewater Treatment in Water Hyacinth Ponds

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2381-2384 ◽  
Author(s):  
C. Polprasert ◽  
S. Kessomboon ◽  
W. Kanjanaprapin
Keyword(s):  
Wastewater Treatment ◽  
Water Hyacinth ◽  
Loading Rate ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Small Scale ◽  
N Removal ◽  
In Series

Small-scale and pilot-scale experiments were conducted on pig wastewater treatment in water hyacinth (Eichhornia crassipesl ponds. The main objectives were to evaluate the treatment performance of the water hyacinth ponds and to determine suitable operating conditions. From the experimental results obtained, the optimum organic loading rate was found to be 200 kg COD/(ha.d), while the hydraulic retention times were proposed to be 10-20 days. The % COD removal in the small-scale water hyacinth ponds were 74-93, while for the pilot-scale ponds the % COD removal were 52-72 because of fluctuations in the influent wastewater characteristics and occasional insect attacks on the water hyacinth leaves and stems. Similar results were obtained for N removal. Although the water hyacinth ponds were found to be feasible for pig wastewater treatment, at least one polishing pond in series should be provided to polish the water hyacinth pond effluents before discharging into the environment.

scholarly journals Hydrothermal liquefaction of sewage sludge; energy considerations and fate of micropollutants during pilot scale processing

2020 ◽  
Vol 183 ◽  
pp. 116101
Author(s):  
Lars Bjørn Silva Thomsen ◽  
Pedro N. Carvalho ◽  
Juliano Souza dos Passos ◽  
Konstantinos Anastasakis ◽  
Kai Bester ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Pilot Scale ◽  
Hydrothermal Liquefaction

Control and separation of algae particles from WSP effluent by using floating aquatic plant root mats

2001 ◽  
Vol 43 (11) ◽  
pp. 315-322 ◽  
Author(s):  
Y. Kim ◽  
W.-J. Kim ◽  
P.-G. Chung ◽  
W. O. Pipes
Keyword(s):  
Water Hyacinth ◽  
Aquatic Plant ◽  
Plant Root ◽  
Pilot Scale ◽  
Waste Stabilization Ponds ◽  
Attachment Sites ◽  
Waste Stabilization ◽  
Continuous Reproduction ◽  
Adsorption Phenomena ◽  
Integrated Processes

In this paper, the potential uses of water hyacinth and its root mats for separating algae particles in the effluent from waste stabilization ponds (WSPs) were discussed. Pilot-scale integrated processes consisting of WSPs and multiple WHPs (water hyacinth ponds) were operated in order to extract effects of the root mats on the reduction of algae concentrations. Root mats in the bottom of WHPs separated significant amount of the algae cells through attachment as the effluent from WSPs passed through them. Attachment of the algae particles to the surface of live roots was found to be similar to adsorption phenomena but it lasted even at saturation, probably due to the continuous reproduction of active attachment sites by detachment and growth of the roots. Additionally, this paper discusses attachment mechanisms and other issues concerning design and polishing of the WSPs effluent by WHPs.

Modelling Trace Element Emissions in Co-Gasification of Sewage Sludge With Coal

2002 ◽  
Author(s):  
G. P. Reed ◽  
D. R. Dugwell ◽  
R. Kandiyoti
Keyword(s):  
Experimental Data ◽  
Trace Elements ◽  
Sewage Sludge ◽  
Trace Element ◽  
Energy Recovery ◽  
Pilot Scale ◽  
Gaseous Species ◽  
Fuel Gas ◽  
Gas Cleaning ◽  
Hot Gas

Gasification has attracted considerable interest from water utilities as a sewage sludge disposal option, with the advantages of waste volume reduction, pathogen destruction and energy recovery. Co-gasification with coal in a larger plant (>10 MWt) employing a gas turbine for energy recovery may reduce the risk and cost of this option. However, controlling the release of trace elements such as Pb and Zn in the gas produced may be necessary to avoid corrosion, and to meet environmental requirements. A thermodynamic equilibrium model has been used to make predictions of the speciation of trace elements in the fuel gas from co-gasification of sewage sludge with coal. Experimental data from a pilot scale 2 MWt sewage sludge/coal co-gasification plant with a hot gas filter was used to test the validity of these predictions. No significant amount of Be, Co, Cu, V and Zn was predicted to be in the form of gaseous phase species, and this was confirmed by the experimental data. On the other hand, Hg and Se were predicted to be only present in gas phase species, and this was also confirmed experimentally. The elements As, B, Cd, Pb, Sb and Sn were all predicted to form a larger amount of gaseous species than was observed in the experimental measurements. Refinement of the predictions for As and B by inclusion of specific minor/trace element interactions with Ni and Ca respectively gave a better agreement with the experimental data. Whilst the experimentally-observed lowering of Pb emissions by reduction of the gas cleaning temperature from 580 °C to 450 °C was qualitatively predicted, the concentration of Pb in the fine dust removed by the hot gas filter indicates condensation at higher temperatures than predicted. The absence of thermodynamic data for the more complex minerals and adsorbed species that may be formed is thought to account for some of these differences.

The Aeration Control during Co-Composting of Sewage Sludge and Wooden Chips in a Rotary Drum Reactor

2014 ◽  
Vol 878 ◽  
pp. 720-728
Author(s):  
Yuan Cheng Zhang ◽  
Luis Caicedo ◽  
Hong Tao Wang
Keyword(s):  
Sewage Sludge ◽  
Control Strategies ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Moisture Removal ◽  
Two Stage ◽  
Composting Process ◽  
Temperature Feedback ◽  
Rotary Drum ◽  
Aeration Control

To optimize the aeration control during the co-composting process of sewage sludge and wooden chips in a rotary drum reactor, it was proposed to study the implementation of different control strategies. A series of pilot scale experiments were carried out in a rotary drum reactor with a volume of 3.14m3, using 800 kg sewage sludge from 2nd wastewater treatment plant of Kunming and 400 kg wooden chips collected from parks in Kunming as compost materials. Temperature, oxygen concentrations, volatile solid contents and moisture content were followed during the composting process as important variables to compare different aeration control strategies (continuous, intermittent and two stage temperature feedback aeration control strategies). The obtained results have shown that two stage temperature feedback aeration control strategy is the optimal, because it can effectively control the temperature during composting, with better moisture removal and higher organic matter degradation than the other strategies, obtaining a stabilized product with less nutrient elements losses.

Effectiveness of bulking agents for co-composting penicillin mycelial dreg (PMD) and sewage sludge in pilot-scale system

2015 ◽  
Vol 23 (2) ◽  
pp. 1362-1370 ◽  
Author(s):  
Shihua Zhang ◽  
Zhiqiang Chen ◽  
Qinxue Wen ◽  
Lian Yang ◽  
Wenyan Wang ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Pilot Scale ◽  
Bulking Agents
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