Innovative and novel solutions for waste water treatment in industrial

and municipal sector

Johanna Hentunen

Head Consultant

Aquazone

www.aquazone.fi

Problems to be solved?

www.aquazone.fi

Case example:• Town: 100 -200 thousand inhabitants• Waste water: 10 - 18 Million m3/year

• Sewer pipelines’ construction budget: 6-8m€/year. • Length of sewer pipeline system: 800 – 1300 km.• Need for additional capacity: +20-30%

• No room for WWTP expansion• WWTP is located in prime spot.• Pressure to take in industrial waste waters• Sludge transportation cost is unbearable

Corrosion caused by sulfuric acids has shorten the lifetime of concrete sewer pipeline to 1/5. Lifetime of electronic device can shorten to ¼. (EPA, Hydrogen sulfide corrosion: Its Consequences, Detection and Control, 1991).

Sewer system pain points: bad odor and corrosion

www.aquazone.fi

1. Online measurements and real-time monitoring in sewer pipeline networks

Locate problem points & their origin.

2. Start controlled dosing of oxidizing agent to prevent formation of hydrogensulphide and sulphuric acid.

Simple steps for cure

www.aquazone.fi

testContinuous dosing

H2

S con

centratio

n, [p

pm

]

Date [dd/mm/2013], Place: City of Mäntsälä, FinlandAaverage flow rate: 100 m3/d

• Safe and efficientchemical

• Online monitoring• Alarms through SMS

and e-mail• Remote control and

adjustments via web& by SMS

WWTPs are often located in challenging locations

www.aquazone.fi

• How to manage capacityexpansions?

• How to manage sludge with:• less space, • shorter time• minimized transportation cost?

WWTP retrofits to save space while increasing capacity

www.aquazone.fi

In MBR process, Membrane Units are installed in aeration Tank to filtrate water from activated sludge.

MBR halves the Hydraulic Retention Time compared to Conventional Activated Sludge system (CAS).

Converting the Existing CAS into MBR → Enable Advanced treatment

Converting the Existing A2O into MBR → Double the Treating Capacity

CAS Flow

Primary Clarifier

Aerobic tank Secondary settling tank

Emergency reservoir

or Permeate tank

A2O-MBR Process

• Use a primary clarifier as it is.

• Retrofit Aerobic tank to A20 tank enables higher N and P removal

• Retrofit secondary clarifier as a permeate tank or an emergency reservoir.(or as a secondary clarifier of existing other trains)

Anaerobic-Anoxic-Oxic

Ｍ Ｍ

How to Retrofit to MBR

Cleaner effluent Complete SS removal No need for sedimentation tank of e.g. sand filtration

Reference: Sludge treatment case Mikkeli, Finland

www.aquazone.fi

Date E. coli (cfu / g)

5.12.2011 4 800 000

5.12.2011 10

5.12.2011 < 10

7.12. 2011 < 10

8.12.2011 280 000

8.12.2011 10

8.12.2011 < 10

Situation

before

Aquazone

treatment

Aquazone

treatment in

use

Treatment of raw and digested sludge with 1-hour batch treatment. End product ready for immediate agricultural use.

Method approved by Finnish Food Safety Authority Evira

Online sewer system measurement development and utilization of data.

Online WWTP effluent measurement and process control.

Design and production of compact industrial waste water treatment plants for waste water pre treatment, treatment and circulation.

How can we work together?

www.aquazone.fi

Thank You!

jyri.koivisto@aquazone.fi

ville.knaapila@aquazone.fi

johanna.hentunen@aquazone.fi

www.aquazone.fi