WASTEWATER TECHNOLOGY

ZERO LIQUID DISCHARGE

 

M.V.R. Evaporator unit

Crystalization unit

 

Demineralization unit
 

 
APPLICATION
O.S.
Zero Liquid Discharge
Water recovery
Wastewater treatment

 

“Zero Liquid Discharge” (ZLD) identifies industrial wastewater treatment plants which have no external discharge on the surface or into sewers, but only occasional disposals by lorry.

ZLD is a treatment philosophy originating from a deep knowledge of the production cycle and allows the “complete” recovery of otherwise wasted water, through several steps of treatment.

The main steps leading to the recovery of solutions or rinse water are:

1) Optimization of the prodcution cycle

2) Recovery of exhausted solutions

3) Effluents treatment

4) Concentration by evaporation

 

The physical law that "nothing is created and nothing is destroyed, but all is transformed" is the basic principle upon which a ZLD treatment works.

 

More in detail, the above concept can be explained throught the following steps:


1 - Reducing the amount of discharged pollutants from the production cycle to the treatment plant brings a consistent reduction of the sludge and concentrated salts produced at the end of the line.

This can be done by:

§  Limiting the drag-out

§  Keeping the chemical solutions under control

§  Using specific treatment units which extend the chemical solutions lifetime.

2 - Use purification systems of the solutions, whose purpose is to remove specific pollutants that generate pollution.

Some examples are:
Systems of oil removal from solutions of degreasing

Systems of removal of specific pollutants from heavy metals

Specific removal systems

3 - Specific wastewater treatment which allows the waste reuse in production processes.

4 - The concentration by evaporation's technology allows to concentrate solutions up to a density very close to the crystallization's one (Density> 1.2 kg / liter).

ZLD treatment plants produce:

- A slurry (Sludge), mainly made of metal hydroxides, which has a dry matter content of not less than 25%

- Liquid concentrates of dissolved salts or even crystals

 This liquid mainly consists in inorganic compounds such as:

• Chlorides

• Sulfates

• Nitrates

• Fluorides

• Sodium

• Potassium

Both these wastes should be disposed of through authorized centers.

Further treatments of the concentrated liquids by evaporation will lead to the formation of a crystalline solid waste, to be properly disposed of either.

Crystallization occurs in a separate dedicated evaporator.

Of course not all solutions will lead to crystallized solids: for certain liquids, such as organic solutions, heavily concentrated may only be obtained, never leading to solid matter, unless using enormous amounts of heat.

On the contrary, if the original liquid is predominantly made of an inorganic nature, crystallization is feasible.

 

SPECIFIC APPLICATION

ECOZLD-ZN - Zero liquid Discharge in electrolitic Zinc Plating

                     ECOZLD-ZN                  

ECOZLD-AL - Zero liquid Discharge in Aluminium Coating pretreatment

                     ECOZLD-AL                           

ECOZLD-CRH - Zero liquid Discharge in Hard Chrome plating 

                     ECOZLD-CRH                 


 
RELATED TOPICS
Purification
Demineralization
Evaporation
Crystallization
Sludge treatment
Sludge drying
Control and process optimization

 



ECOTEAM SPA
Sede Legale ed Operativa
- Via del Padule 23/F - 50018 Scandicci - FIRENZE - ITALY - Tel. +39.055.73.55.51 - Fax +39.055.73.55.55.00 - info@ecoteam.it
COPYRIGHT © 2015 ECOTEAM. ALL RIGHTS RESERVED

 


NEWS

2021 News N3

2021: New order in the aeronautical sector

N5-2020

2020-Oct: Scraped type heat pump evaporator model ECOCR1500 destination France

N4-2020

2020-August: Scraped type heat pump evaporator model ECOCR1500 destination Switzerland

2021 News N4

New order for 3,000 l/d heat pump scraped evaporator

N3-2020

2020- August: Testing of the oily emulsions treatment plant completed, capacity 12,000 l / day

N2-2020

2020-July: Start-up of wastewater treatment plant in the anodic oxidation sector (Italy)

2021 News N2

ECOCR 1500 scraped heat pump evaporator delivered. Destination France

N1-2020

2020 July: Started ZLD (Zero Liquid Discharge) pickling phosphating in Italy

Export 3

2015-October: Delivered evaporator ECOCV30000 for Russian federation

Export 2

2015-October: Delivered supply for UEA

Italy N2

2015-October: Successfully started Automotive wastewater plant

2021 News N5

New order for 2 vacuum evaporators with mechanical vapor recompression
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