scholarly journals Modeling sludge accumulation rates in lined pit latrines in slum areas of Kampala City, Uganda

2016 ◽  
Vol 10 (8) ◽  
pp. 253-262 ◽  
Author(s):  
Lugali Yvonne ◽  
Zziwa Ahamada ◽  
Banadda Noble ◽  
Wanyama Joshua ◽  
Kabenge Isa ◽  
...  
Keyword(s):  
Accumulation Rates ◽  
Kampala City ◽  
Slum Areas ◽  
Sludge Accumulation

scholarly journals Contextual investigation of factors affecting sludge accumulation rates in lined pit latrines within Kampala slum areas, Uganda

Water SA ◽  
2016 ◽  
Vol 42 (3) ◽  
pp. 490
Author(s):  
Ahamada Zziwa ◽  
Yvonne Lugali ◽  
Joshua Wanyama ◽  
Noble Banadda ◽  
Isa Kabenge ◽  
...  
Keyword(s):  
Accumulation Rates ◽  
Factors Affecting ◽  
Slum Areas ◽  
Sludge Accumulation

scholarly journals CFD analysis of sludge accumulation and hydraulic performance of a waste stabilization pond

2012 ◽  
Vol 66 (11) ◽  
pp. 2370-2377 ◽  
Author(s):  
Andres Alvarado ◽  
Esteban Sanchez ◽  
Galo Durazno ◽  
Mehul Vesvikar ◽  
Ingmar Nopens
Keyword(s):  
Time Distribution ◽  
Tracer Experiment ◽  
Cfd Modeling ◽  
Cfd Analysis ◽  
Accumulation Rates ◽  
Waste Stabilization Ponds ◽  
Waste Stabilization Pond ◽  
Waste Stabilization ◽  
Rtd Analysis ◽  
Sludge Accumulation

Sludge management in waste stabilization ponds (WSPs) is essential for safeguarding the system performance. Sludge accumulation patterns in WSPs are strongly influenced by the pond hydrodynamics. CFD modeling was applied to study the relation between velocity profiles and sludge deposition during 10 years of operation of the Ucubamba WSP in Cuenca (Ecuador). One tracer experiment was performed and three sludge accumulation scenarios based on bathymetric surveys were simulated. A residence time distribution (RTD) analysis illustrated the decrease of residence times due to sludge deposition. Sludge accumulation rates were calculated. The influence of flow pattern on the sludge deposition was studied, enabling better planning of future pond operation and desludging.

Sludge accumulation in an anaerobic pond and viability of helminth eggs: a case study in Burkina Faso

2010 ◽  
Vol 61 (4) ◽  
pp. 919-925 ◽  
Author(s):  
Y. Konate ◽  
A. H. Maiga ◽  
J. Wethe ◽  
D. Basset ◽  
C. Casellas ◽  
...  
Keyword(s):  
Public Health ◽  
Burkina Faso ◽  
Average Rate ◽  
Dry Weight ◽  
Average Concentration ◽  
Egg Viability ◽  
Accumulation Rates ◽  
Helminth Eggs ◽  
Sludge Accumulation

Accumulation rates and pathogen concentrations in primary stabilization pond sludges in developing countries are important parameters for adequate sludge management and the safeguarding of public health with sludge reuse in agriculture. An anaerobic pond has been investigated for sludge accumulation rates and helminth egg viability after four years of operation in Burkina Faso. The rate of sludge accumulation was measured at 0.037 m3/capita-year or 2.26 kg dry weight/capita-year. An equation describing vertical distribution of total solids in the accumulated sludge was found to be adequately represented by a regression equation. Influent helminth egg concentrations were reduced on average by 90% in the anaerobic pond effluent. Ascaris lumbricoides and Ancylostoma sp. were the most common eggs present in the sludge after four years of operation. The average concentration of helminth eggs in pond sludge was 536 eggs/g TS, and the percentages of viability ranged from 10.8% (47 viable eggs/g TS) to 57.2 (1,772 viable eggs/g TS, with an average rate of 36% (336 viable eggs/g TS). From a sludge depth and section study, egg viability was found to be randomly distributed in the sludge layer.

Wastewater stabilisation ponds: sludge accumulation, technical and financial study on desludging and sludge disposal case studies in France

2005 ◽  
Vol 51 (12) ◽  
pp. 227-234 ◽  
Author(s):  
B. Picot ◽  
J.P. Sambuco ◽  
J.L. Brouillet ◽  
Y. Riviere
Keyword(s):  
Accumulation Rate ◽  
Cost Evaluation ◽  
Accumulation Rates ◽  
Filling Rate ◽  
Treatment Processes ◽  
Sludge Disposal ◽  
Operation And Maintenance ◽  
Per Capita ◽  
The Cost ◽  
Sludge Accumulation

Waste stabilisation pond treatment was widely developed during the 1980s in France, where there are now over 3,000 plants. Desludging the ponds has now become essential. In 19 primary facultative ponds, in operation for 12–24 years, the net average sludge accumulation rate was 19 mm/yr. The average per capita accumulation rates ranged from 0.04–0.148 m3/person.year (mean of 0.08 m3/person.year). In primary facultative ponds the volume of sludge represented 15–39% of the total volume of the basin. A filling rate above 30% necessitates desludging. In France, a desludging interval of 15 years is recommended for primary facultative ponds. The cost evaluation of desludging and landspreading showed differences according to the desludging technique used. Desludging after emptying the water had an average cost of 38 €/m3 of sludge with 10% dry solid (range from 20 to 83 €/m3). Under-water desludging was 50% more expensive. Although desludging is carried out only after several years of operation, its cost must be allowed for in the annual operation and maintenance costs of the process. It can be estimated to be 3 €/person.year. Even with this additional cost, waste stabilisation pond treatment remains less expensive than other treatment processes.

SEDIMENT ACCUMULATION RATES QUANTIFIED WITH COSMOGENIC NEON-21 ON A GLACIAL MORAINE, BLOODY CANYON, CA

2017 ◽  
Author(s):  
Daniel Morgan ◽  
◽  
Greg Balco ◽  
Alison Cribb ◽  
J. Warner Cribb ◽  
...  
Keyword(s):  
Sediment Accumulation ◽  
Accumulation Rates
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