Worry Wastes in Water- Dec '05 1

MIDFIELD MEATS CASE-STUDY

Worry Wastes in Water- Dec '05 2

Midfield Meats Project requirements• Technical

• An alternative to DAFF• Easily integrated into existing• Offers future enhancements to water quality

• Operational• No chemical dosing

• Quality• Midfield’s claim “We aim to be the best”• Reduce SS and BOD loadings specifically• To improve existing WWTP performance

• Cost• Reduce loadings to lower Trade Waste Charges• No ongoing chemical costs

Worry Wastes in Water- Dec '05 3

Original WWTP Plant

Worry Wastes in Water- Dec '05 4

With Two Baleen filter unitsGreen Stream (front) & Red Stream (rear)

Worry Wastes in Water- Dec '05 5

Green StreamAverage Peak Daily Operating hrs

Wastewater Flow to Primary Treatment Upto 30+ Lps (or 108 m3/hr) Upto 1.0 ML 12+

BOD (highly variable) Upto 10,000+ mg/L

SS (highly variable) Upto 10,000+ mg/L

Wastewater Flow to Baleen Filter after Pre-screens and Contra-Shear

(Absolute rating ~0.5 mm)

~30 Lps (or 108 m3/hr)

BOD to Baleen Filter Upto 2,500+ mg/L

SS to Baleen filter Upto 2,500+ mg/L

Temperature < 30 deg C

Worry Wastes in Water- Dec '05 6

Green Stream micro-screening

Worry Wastes in Water- Dec '05 7

Red StreamAverage Peak Daily Operating hrs

Wastewater Flow to Primary Treatment Upto 20+ Lps (or 72 m3/hr) Upto 0.5 ML 12+

BOD (highly variable) Upto 10,000+ mg/L

SS (highly variable) Upto 5,000+ mg/L

Wastewater Flow to Baleen Filter after Pre-screens and Contra-Shear (Absolute rating ~0.5 mm)

~20 Lps (or 72 m3/hr)

BOD to Baleen Filter Upto 10,000+ mg/L

SS to Baleen filter Upto 5,000+ mg/L

Temperature <50 deg C

Worry Wastes in Water- Dec '05 8

Red Stream micro-screening

Worry Wastes in Water- Dec '05 9

Combined Treated water Discharge BOD(daily composite average based upon ¼ ly)

600-650 mg/L

Combined Treated Water Discharge SS(daily composite average upon ¼ ly)

600-650 mg/L

Red + Green Stream Pre-discharge

(without chemicals)

Green stream 1.3mm screenings

Green stream 0.065mm screenings

Worry Wastes in Water- Dec '05 10

Water Quality • Before Baleen

• SSav1400mg/L

• BODav1400mg/L

• FOG N/R

• After Baleen

• SS av625mg/L

• BOD av625mg/L

• FOG av250mg/L

• After in-series CAF

• SS 280mg/L

• BOD 380mg/L

• FOG 35mg/L

Worry Wastes in Water- Dec '05 11

Micro-screening plus CAF

INFLUENT FILTRATE

Worry Wastes in Water- Dec '05 12

Abattoir effluent pre-CAF

Worry Wastes in Water- Dec '05 13

Abattoir effluent post CAF