Inspire : Public Works Professional Sept - Oct 2013
28 Public Works Professional September-October 2013 NO COMPROMISE the sump and starts to break down, discharging nutrients into the surrounding environment. "Left in stormwater, organic r ubbish can result in anaerobic breakdown, which depletes the water of oxygen and nitrogen, resulting in problems such as algal blooms and ﬁsh kills,” explained Bennett. In response, Baramy Engineering has pioneered an alternative 'dry rubbish' solution, which works by storing captured waste in an exposed containment bay, so that it's out of the water when the fow abates. By keeping r ubbish dry, excess phosphorous and nitrogen is prevented from entering the water ways. Once captured, the waste stays in the containment bay during subsequent events. Even if left for some time, it will simply compost as nature intended. Blue Mountains City Council installed a Baramy pollutant trap to protect a critically endangered Dwarf Mountain Pine (Pherosphaera ﬁtzgeraldii) growing in the rock-face at Katoomba Falls. The rare plant, populations of which are found only in the Blue Mountains, was under stress due to high sediment loads and the rampant regrowth of weeds caused by excess nutrients from wet waste in the water cycle. Apart from the environmental beneﬁts, the trap has brought about economic and safety beneﬁts too, reducing the need to abseil down the rock-face for regular weeding. EMERGING TRENDS "Increasingly, local governments are turning to a new breed of sophisticated gross pollutant trap to protect and enhance the effectiveness of bioretention basins,” said Bennett. Representing a growing trend as part of councils' water sensitive urban design (WSUD) initiatives, bioretention basins -- also called rain gardens – support indigenous fora and fauna. Their primary function, however, is to let waste seep through the basin and down into an outlet below, using the organics and the ﬁltration media to remove ﬁne pollutants. Some councils have installed Baramy's systems to protect the basins from bigger pollutants, such as coarse silt, thereby enabling the bioretention process to “polish” the water. "By cleaning the water before it enters, our gross pollutant traps prevent the overloading of bioretention basins, so they last longer and do a more thorough job,” said Bennett. Baramy Engineering also currently has projects under way in Malaysia, Zambia and the Philippines. ••• A pollutant trap was installed to protect an endangered Dwarf Mountain Pine growing in the rock-face at Katoomba Falls. Le in stormwater, organic rubbish can result in anaerobic breakdown, which depletes the water of oxygen and nitrogen, resulting in problems such as algal blooms and sh kills.
Public Works July Aug 2013
Public Works Nov Dec 2013