WASSTRIP® (Waste Activated Sludge

Stripping to Remove Internal

Phosphorus) complements Ostara’s

Pearl® nutrient recovery process in

bio-P plants by releasing magnesium,

potassium and phosphate before it

reaches the WAS thickening stage.

Providing a more comprehensive

nutrient management solution,

WASSTRIP increases process efficiency

and energy recovery potential.

By effectively stripping struvite from

wastewater treatment systems,

WASSTRIP improves plant performance,

increases digester capacity, and

helps efficiently produce drier, more

balanced biosolids.

®

TREATED EFFLUENT

CRYSTAL GREEN PRILLS

SECONDARY TREATMENTINFLUENT EFFLUENT

ANAEROBICDIGESTER

WASSTRIP®

SLUDGE

LIQUOR

SLUDGE

THIC

KENER

DE-WATE

RING

LIQUOR

SLUDGE

PHOSPHORUS AND AMMONIA

PHOSPHORUS AND MAGNESIUM

TARGETED STRUVITE CONTROL

WASSTRIP®

▪ Improved digested sludge dewaterability

▪ Struvite scale protection throughout the sludge treatment stream

▪ Reduced biosolids phosphorus content

▪ Improved digestion performance

▪ Increased production of Crystal Green® fertilizer

▪ Reduce total phosphorus by up to 9%

▪ Reduce water soluble P in biosolids by 70%

▪ Increase dryness of cake while reducing volume by up to 20%

BIOSOLIDS

WA

SSTRIP

HOW IT WORKS

WASSTRIP® tackles struvite issues; improving dewaterability, reducing

biosolids production, and preventing struvite formation throughout

the wastewater treatment plant. The thickening liquor, such as GBT

filtrate, DAF subnatant etc., is diverted from the sludge stream and

combined with dewatering liquor so the nutrients can be recovered for

reuse in the Pearl® reactor, virtually eliminating the buildup of struvite

throughout the system.

A cost-effective and complementary solution upstream of the Pearl

process, WASSTRIP solves struvite issues before they start.

BOO

ST DEW

ATERABILITY

IMPROVE DIGESTED SLUDGE DEWATERABILITY

By releasing nutrient compounds before they reach the digester, WASSTRIP®

improves dewaterability, effectively producing drier, more balanced biosolids.

WASSTRIP also saves money by reducing dependency on coagulants and

flocculants such as alum and polymers.

ANNUAL AVERAGE REDUCTION IN DRY & WET BIOSOLIDS PRODUCTION

DRY TONS (UP TO 28%) WET TONS (UP TO 25%)

14 TONS 60 TONS10 TONS 45 TONS

▪ Decrease costly dependence on coagulants and flocculants

▪ Increase biosolids cake solids by up to 4%

▪ Reduce biosolids production up to 20%

REDU

CE BIO

SOLID

S

Nutrient pollution from fertilizer runoff is a growing concern. Many jurisdictions now limit

the amount of P allowed in biosolids. WASSTRIP® helps improve the P to N balance by

reducing the total phosphorus content. WASSTRIP also drastically reduces the amount of

orthophosphate, or water soluble P, decreasing the mobility of the phosphorus in the soil

and further reducing the risks of runoff, while potentially allowing for greater distribution

for land application.

REDUCE OVERALL BIOSOLIDS VOLUME WHILE PRODUCING DRIER, MORE BALANCED BIOSOLIDS

REDUCE BIOSOLIDS BY NEARLY 1 TRUCKLOAD PER DAY

▪ Reduce total phosphorus by up to 9%

▪ Reduce water soluble P in biosolids by 70%

▪ Increase dryness of cake while reducing volume by up to 20%

REDUCE STRUVITE FORMATION BY 90%

WITHOUT WASSTRIP® WITH WASSTRIP®

Struvite formation can occupy valuable space in the digester, lowering efficiency,

decreasing capacity and requiring costly cleaning and maintenance. WASSTRIP®

selectively releases the P & Mg before they reach the digester, bypassing it for

the Pearl® where the nutrients can be recovered, rather than wasted.

IMPROVE DIGESTER CAPACITY AND PREVENT STRUVITE FORMATION

▪ Decrease struvite formation in anaerobic digesters

▪ Reduce maintenance and cleaning costs

▪ Increase digester capacity

IMPRO

VE DIG

ESTER CA

PAC

ITY

OSTARA NUTRIENT RECOVERY TECHNOLOGIES

Ostara.com

690 - 1199 West Pender StreetVancouver, BC Canada V6E 2R1

T 604 408 6697 | F 604 408 4442E info@ostara.com

1723 South Kings AvenueKings Avenue Executive ParkBrandon, FL 33511 USA

T 803 666 8123