Prechlorination is used as an initial step in water purification for public supply. One of the drawbacks of the prechlorination is the reaction between natural organic matters with chlorine forming trihalmethanes. This study aims at evaluating the performance of granular activated carbon (GAC) with sand as a dual filtering media with different depths on removal of trihalomethanes (THMs) for imp...

Changes in nutrient concentrations and sediment texture of the seagrass beds were recorded for two years from July 1996 to June 1998 at monthly intervals at two stations (Station 1--Manoli island; Station 2--Chinnapalam) of the Gulf of Mannar Marine Biosphere Reserve. Different nutrients in water showed varied concentrations in different seasons. Phosphate concentration varied between 2.32 and ...

Saltation is an important geological process and the primary source of atmospheric mineral dust aerosols. Unfortunately, no studies to date have been able to precisely reproduce the saltation process because of the simplified theoretical models used. For example, sand particles in most of the existing wind sand movement models are considered to be spherical, the effects of the sand shape on the...

Abstract A sets of sand column experiments were conducted to investigate the transport and deposition of colloids in water-saturated porous media, and the mechanism of the permeability reduced by transport and deposition of colloids are discussed. The research results show that the breakthrough curves of colloid transport in water-bearing media presented as three stages: “not-yet-breakthrough”,...

Unlike green sand, chemically bonded sand cannot be used again and again without reclamation because in this system, the mixed sand gets it`s strength through chemical reaction which is irreversible in nature. Each sand particle is coated with this reacted chemical, which behaves like an inert element after usage once. This inert coating also called “Dead” binder needs to be removed from the us...

We conducted flume experiments for a debris flow consisting of coarser particles, finer particles and sand, focusing on the concentration at front. Our experimental results revealed that front using sediment mixture with sand was less than without sand. This may be because including component in material contributed to smaller averaged interstice between layer particle size. These lead reduce f...

Wedetermined that spinosad interacts synergistically with the biocontrol agentMetarhizium anisopliae (Metch) Sorokin to increase the mortality of two wild-collected wireworm species, Agriotes lineatus(L.), andAgriotes obscurus(L.).BioassayswereperformedusingaM.anisopliae isolate originally acquired from a local wireworm cadaver.M. anisopliaewas applied as a soil drench at 3.3 10 and 10 conidia ...

A new sand filtration water disinfection technology is developed which relies on the antimicrobial properties of hydrophobic polycations (N-hexylated polyethylenimine) covalently attached to the sand's surface. The efficacy of the filter disinfection process was evaluated both with water spiked with E. coli and with real aqueous effluent from a wastewater treatment plant. For the former, over 7...

We present an interactive sand art drawing system using one RGB-D sensor, such as Kinect. Our system supports the common sand drawing functions, such as sand erosion, sand spilling, and sand leaking. To use hands to draw virtual sand on a drawing plane, we design four key gestures which enable drawing manipulation actions for sand. The basic idea is that the gesture of one hand controls the dra...