midfield meats case-study

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MIDFIELD MEATS CASE-STUDY. 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” - PowerPoint PPT Presentation

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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

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