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Eco Action

Sludge screens help Sydney Water produce biogas from sewage

S

TRAINPRESS® technology from Hydroflux HUBER

The STRAINPRESS® sludge screen is a pressure-fed

is playing a small but vital part in helping Sydney

inline system for screening any type of sludge, including

Water achieve its goal of making a number of

highly viscous and greasy waste. Said to increase the

improvements at its Malabar sewage treatment

reliability of downstream sludge treatment systems and

plant. One of the major benefits will be an improvement

to reduce maintenance requirements, it consists of inlet

in the quality of biosolids produced.

and screening zone, a press zone and a discharge section.

The Malabar STP, which processes nearly half of the

A pump presses the liquid through the screening zone

city’s sewage through its primary treatment processes,

and delivers it to further process steps or utilisation.

produces about 33,000 tonnes a year of nutrient-rich

The liquid is under pressure. The coarse material, which

biosolids — a soil conditioner/fertiliser which is used

is retained on the screen surface, is stripped off by a

extensively to improve the fertility and structure of farming

coaxial screw and pushed through the press zone, where

soils in NSW. These biosolids can produce green energy

the material is extensively dewatered and compacted. The

in the form of biogas.

compacted material is pressed through a gap around a

“To increase the performance and efficiency of anaerobic digesters that process the biosolids, Hydroflux HUBER

hydraulically operated pressure cone, which closes part of the pipe end and builds up counter pressure.

supplied the Malabar STP with three HUBER STRAINPRESS®

The system does not need any wash water, as backwashing

sludge screens,” said John Koumoukelis, a director of

of the screen is unnecessary. The perforation and design

Hydroflux HUBER.

of the discharge section are individually adjusted to suit

“These STRAINPRESS ® sludge screens have been operating for six months and are successfully removing

specific requirements and it is easy to integrate the product into the existing pipeline and automatic system.

unwanted screenings such as plastics, fine rags and cotton

“One of the major benefits of STRAINPRESS® is that

buds from biosolids before it is processed in the anaerobic

it prolongs the need to put a digester offline for cleaning

digesters. These materials would also block mixers, heat

by many years — so the three sludge screens will make

exchangers and sludge pumps that are installed within

a major contribution to minimising the maintenance costs

the digesters.

at the Malabar STP,” said Koumoukelis.

“These unwanted materials would otherwise accumulate within the digester, leading to a reduction in performance, maintenance headaches and a reduction in the amount of gas produced.”

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Hydroflux HUBER Pty Ltd www.hydrofluxhuber.com.au

Apr/May 2017 - Sustainability Matters 37

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Sustainability Matters Apr/May 2017  

Sustainability Matters is a bi-monthly magazine showcasing the latest products, technology and sustainable solutions for industry, governmen...

Sustainability Matters Apr/May 2017  

Sustainability Matters is a bi-monthly magazine showcasing the latest products, technology and sustainable solutions for industry, governmen...