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New New New New New Plant Plant Plant Plant Plant<br />
Siltbuster Siltbuster launches launches truck truck mixer<br />
mixer<br />
washwater washwater treatment treatment system<br />
system<br />
The problem of what to do with the water used to wash<br />
out truck mixers on site has been addressed by Siltbuster<br />
Ltd of Monmouth in Wales. It has developed a portable<br />
unit that can capture and properly treat the high pH water<br />
generated by concreting activities on construction sites.<br />
Called the RCW - Roadside Concrete Washwater - the<br />
new patented Siltbuster design combines solids removal<br />
and automatic pH adjustment in a single, compact and<br />
readily transportable unit and also comes with its own battery<br />
powered automatic control system. The RCW provides<br />
a solution for the many contractors currently struggling<br />
to treat and legally dispose of such high pH<br />
cementitious washwater. In the UK it allows contractors to satisfy the Environment Agency's Pollution Prevention<br />
Guidelines 5 (PPG5).<br />
Measuring 2.0m wide by 3.0m long, the RCW system's small footprint and integrated design makes it ideally<br />
suited for inner city or remote construction sites, as well as larger scale projects and concrete pours. The RCW<br />
system is capable of handling the washwater from between 25 and 30 mixer trucks per day.<br />
After offloading his concrete, each truck mixer driver simply reverses his vehicle up to the RCW and washes off<br />
the delivery chute directly into the front end of the RCW unit. Washwater enters one of two specialist dewatering<br />
bags, where any surplus concrete solids are captured and allowed to hydrate ahead of disposal. Bleed water from<br />
the concrete washwater then seeps through the dewatering bag fabric into the main treatment unit for pH adjustment.<br />
On reaching a preset level, the water is treated by pumping carbon dioxide (CO2) vapour into the water. This<br />
process adjusts the washwater's pH level from highly alkaline (circa. pH 13) to neutral (circa. pH 6 - 8). Any<br />
precipitated solids are allowed to settle then the water can be released for discharge off-site or for re-use. Once full,<br />
the dewatering bags are simply removed and the concrete solids can then be reincorporated into other construction<br />
activities on-site, or taken off-site for further treatment or disposal.<br />
Greater Greater loading loading height height from from High High Lift Lift Caterpillar Caterpillar 992K<br />
992K<br />
A new High Lift <strong>version</strong> of its big 992K wheel loader has been launched by Caterpillar. Providing 610mm more dump<br />
clearance than its standard-lift counterpart, the 992K High-Lift can more efficiently load 91 and 136 tonne capacity<br />
trucks such as the Cat 777F and 785C. This High-Lift loader has a power rating of 597kW (801hp) and an operating<br />
weight of 99 tonnes.<br />
The 992K High-Lift has a rated payload capacity of 19.1 tonnes. Assuming 100% bucket-fill factors, maximum<br />
material densities for available buckets, smallest to largest, are 1,780, 1,660 and 1,560 kg/m³). Hinge-pin height at<br />
full lift is 7.55m. Equipped with a 10.7m³ bucket, dump clearance under the teeth (at full height and 45º discharge<br />
angle) is 5.2m.<br />
The design of the 992K High-Lift fabricated single boom incorporates castings in high-stress areas for long-life<br />
durability. For easier maintenance management, the high-lift system shares a significant number of parts with the<br />
standard-lift 992K, including lift and tilt cylinders, position sensor and harness, hydraulic lines and buckets.<br />
Additionally, the 992K High-Lift features many improvements introduced with the standard lift model. It has load<br />
sensing Positive Flow Control (PFC) hydraulics<br />
and there are additional sensors at the<br />
pumps to enhanced operational responsiveness.<br />
The 992K High-Lift loader comes as<br />
standard with a trainer seat. An optional rearview<br />
camera increases the view behind the<br />
machine as do optional, heated rear-view<br />
mirrors.<br />
CP&E <strong>Contractors</strong> Plant & Equipment Vol 1 No 8<br />
Siltbuster has produced this readily<br />
transportable RCW unit to safely and legally<br />
treat the concrete washwater from truck mixers<br />
on site.<br />
Siltbuster<br />
Caterpillar<br />
Caterpillar has introduced this new High-Lift<br />
<strong>version</strong> of its large 992K wheel loader to aid<br />
the loading of 91 to 136 tonne payload<br />
dumptrucks.<br />
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