A survey of septic tank design shows that short-circuiting is minimized and effluent quality is improved when quiet, laminar, fluid-flow is encouraged, such as in long, narrow tanks with little hydraulic ‘dead space’. Longitudinal partitions provide better solids retention by providing longer travel distance, but transverse partitions are advantageous only when the opening between compartments ...

Evaluation
of
Aedes
aegypti
Presence
and
Abundance
in
Septic
Tanks
and
Their
 Impacts
on
Dengue
Transmission
 
 Ronald L. Burke, Doctor of Public Health, 2009 Thesis directed by: David M. Claborn Assistant Professor Department of Preventive Medicine and Biometrics Background: Aedes aegypti is the mosquito vector for dengue fever and has historically been considered to prefer ‘clean’ water for d...

Presence of salts in water has been one of the biggest problems of industrial equipment such as evaporators, boilers, and pipes. These salts gradually form scales on evaporators and boilers tubes and reduce their efficiency. Pretreatment processes are conducted to remove these salts; with sedimentation tanks being one of the essential equipment used in these processes. This study numerically si...

 In order to investigate the effects of artificial substrates (vertical surface of polypropylene fabrics) on cultured shrimp, we reared 28-day old Litopenaeus vannamei post-larvae (PL28) intensively for 90 days at a density of 510 shrimp/m2 in each of 8 tanks. Two tanks containing no artificial substrate were a control group, and 1, 3 and 5 artificial substrates were present in other 6 tanks. T...

This paper describes a methodology for estimating the potential risk to workers and the public from igniting organic solvents in any of the 177 underground waste storage tanks at the Hanford Site in southeastern Washington state. The Hanford Site is one of the U.S. Department of Energy's former production facilities for nuclear materials. The tanks contain mixed radioactive wastes. Risk is meas...

Fast fillings of hydrogen vehicles require proper control the temperature to ensure integrity storage tanks. This study presents an analysis heat transfer during filling a tank. A conjugate based on energy balance is introduced. The numerical model validated against fast experiments in Type IV tank by comparing gas evolution. impact parameters, such as initial temperature, inlet nozzle diameter...

The Neptune system is a mobile robot system used to remotely inspect above-ground storage tanks (ASTs) while immersed in the petroleum product, in order to ascertain from the inside-out the state of corrosion of the floor and side-walls using video and ultrasonics, according to the guidelines laid out by the American Petroleum Institute (API). The robot system allows unmanned entry and sensor d...

large capacity cylindrical tanks are used to store a variety of liquids. their satisfactoryperformance during earthquake is crucial for modern facilities. in present paper, the behavior of cylindricalconcrete tanks under harmonic excitation is studied using the finite element method. liquid sloshing, liquidviscosity and wall flexibility are considered and additionally excitation frequency, liqu...

BACKGROUND A 5-day fathead minnow (FHM) spawning assay is used by industry to monitor pulp mill effluent quality, with some mill effluents capable of completely inhibiting spawning. The purpose of this report is to characterize the effect of an inhibitory effluent on egg and milt production in FHM. METHODS Eight tanks were treated with an inhibitory effluent while eight were kept with clean w...