Page 13 - Australian Pork Newspaper

Energy-efficient aerator is safe for operators
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AEROBIC biological treatment of abattoir wastewater has been a commonly used practice for many years.
The treatment system is designed to reduce bio- chemical oxygen demand by up to 95 percent by introducing dissolved ox- ygen into the wastewater to help with the decom- position of organic sub- stances.
But there are many and varied aeration systems to chose from.
There are [among oth- ers] splasher or propeller- type aerators that sit on the surface of lagoons, submersible aerators that are below the surface and venturi-aerators mounted on the banks of lagoons.
Venturi-aerators, dis- tributed in Australia by Hydro Innovations, use a bank-mounted self-prim- ing pump to draw water from the lagoon, then dis- charge it at pressure, ac- celerating it into the noz- zle of the venturi-aerator.
This acceleration (from 3.6m/s to in excess of 16.5m/s) creates a vac- uum that draws in 2.2 times more air than fluid pumped, mixing air with water.
A hydraulic shear facili- tates the release of soluble gases and volatiles from the water and it is dis- charged, saturated with
dissolved oxygen. According to Hydro In-
novations, the venturi-aer- ation system can deliver high oxygen transfer ef- ficiencies, but the biggest advantage to the system is the ease of access for monitoring, servicing and maintenance.
Because the system is located on the banks of lagoons, not floating on them, operators can safely and easily access them.
This has a very positive impact not only on safety but maintenance costs.
With the V-A system, no cranes or boats are neces- sary to access equipment, eliminating the associated risks (and costs) of having to use them.
Downtime is also great- ly reduced because of the speed at which the equip- ment can be accessed, and because Gorman-Rupp pumps are used to provide the flow and pressure, any service required on the pump is able to be done in a very timely manner.
Asset owners can also derive a level of peace of mind with the system, as pumps and venturi-aera- tion units are designed, cast, machined, assembled and tested in the US.
More information about this system can be ob- tained from info@Hy droInnovations.com.au
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THE National Farm- ers’ Federation has wel- comed the release of the final report into the interactions between the Environment Protection and Biodiversity Con- servation 1999 Act (the Act) and the agriculture sector, prepared by Dr Wendy Craik AM.
NFF president Fiona Simson said, “The NFF has worked closely with Dr Craik and the review process since 2018, advo- cating for outcomes that will finally make the leg- islation more workable for farmers.”
“The NFF’s significant input into this review is reflected in both the rec- ommendations and the body of the report.
“The report makes a number of practical rec- ommendations to reduce the regulatory burden on agriculture without reduc- ing environmental stand- ards.
“The Act’s current one- size-fits-all approach does not recognise the inher- ently complex landscape scale interactions of farm- ing and attempts to force environmental outcomes.”
The report raises legiti- mate concerns about the operation of the legisla- tion, including a lack of clarity around the over- arching objectives of reg- ulation of agricultural ac- tivity; a lack of awareness of the Act; unclear, com- plicated, time-consuming and impractical advice that discourages referring agricultural decisions for www.porknews.com.au
decision; and punitive ap- proaches that disempower the real protection of en- vironmental assets.
In the report, Dr Craik recommends a market- based approach to incen- tivise farmers to protect matters of national sig- nificance, a paradigm shift from the current command and control ap- proach.
“The Act, as it stands, continues to fail to arrest the decline of biodiver- sity crucial to Australia’s food and fibre system,” Ms Simson said.
“A market solution is a sensible mechanism to pursue.”
The NFF is working to develop market-based instruments through its natural capital policy.
The recommendations appear to be substantively consistent with the views put by the NFF in its sub- mission and other engage- ments with the review.
“The NFF welcomes the Minister’s commitment to engage in the conver- sation and to commit to Dr Craik’s recommenda- tions,” Ms Simson said.
“It is crucial we find the right balance between environmental outcomes and the production of food and fibre, underpinned by evidence-based science and the sensible policy that we need to support a growing population.
“The 10-year statutory review of the Act will be critical to the direction of environmental policy in Australia.”
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A bank-mounted Gorman-Rupp pump venturi-aerator system.
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Australian Pork Newspaper, July 2019 – Page 13