Newlisi: sewage sludge treatment and reduction

Among the sludge treatment processes available, the Newlisi solution stands out for its simplicity and effectiveness, enabling sludge to be reduced and recovered in a perfect circular economy synthesis.

The process consists of a two-phase (acid-alkaline) or one-phase (alkaline) oxidative thermochemical hydrolysis of the sludge, conducted at low temperature (not exceeding 85°C) and at atmospheric pressure. Compared to conventional hydrolysis without oxidation, the use of an oxidising agent promotes sludge breakdown and produces soluble compounds suitable for the anaerobic digestion process.

The end result is the reduction of the solid fraction, which when solubilised increases biogas production, makes the sludge more easily digestible and improves its dehydratability.

The complete Newlisi Process consists of 4 stages

Discover each stage

1

Pre-treatments:

sludge thickening
and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding
pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV
3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction (if needed)

- outgoing pH between 6.0
and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40%
dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

The complete Newlisi Process consists of 4 stages

Discover each stage

1

Pre-treatments:

sludge thickening
and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding
pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV
3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction (if needed)

- outgoing pH between 6.0
and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40%
dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

The complete Newlisi Process consists of 4 stages

Discover each stage

1

Pre-treatments:

sludge thickening
and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV
3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction (if needed)

- outgoing pH between
6.0 and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40% dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

The complete Newlisi Process consists of 4 stages

Discover each stage

1

Pre-treatments:

sludge thickening
and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV
3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction (if needed)

- outgoing pH between
6.0 and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40% dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

The complete Newlisi Process consists of 4 stages

Discover each stage

1

Pre-treatments:

sludge thickening
and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV
3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction (if needed)

- outgoing pH between 6.0 and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40% dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

1

Pre-treatments:

sludge thickening
and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV

The complete Newlisi Process consists of 4 stages

Discover each stage

3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction
(if needed)

- outgoing pH between 6.0
and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40% dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

The complete Newlisi Process consists of 4 stages

Discover each stage

1

Pre-treatments:

sludge thickening and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV
3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction
(if needed)

- outgoing pH between 6.0 and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40%
dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

The complete Newlisi Process consists of 4 stages

Discover each stage

1

Pre-treatments:

sludge thickening and heating

Lorem ipsum dolor sit amet,consetetur sadipscing elitr, seddiam nonumy eirmod temporinvidunt ut labore et doloremagna aliquyam erat, sed diamvoluptua. At vero eos etaccusam et justo duo dolores etea rebum. Stet clita kasdgubergren,
- Thickening and shredding
pre-treatments (if needed)

- Heating
2

Oxidative acidic hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 1.0 e 3.0- ORP > 250mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 1.0 and 3.0

- ORP > 250mV
3

Oxidative alkali hydrolysis

- T°C compresa tra 70°C e 90°C- P atmosferica- PH compresso tra 8.0 e 12.0- ORP < -50mV
- T°C between 70°C and 85°C

- P atmospheric

- pH between 8.0 and 12.0

- ORP < -50mV
4

pH neutralization

- Aggiustamento del pH(se necessario)- pH in uscita tra 6.0 e 8.0
- pH correction (if needed)

- outgoing pH between 6.0 and 8.0

Option 1
Hydrolyzed sludge is sent to dewatering section. Dewatering efficiency increases up to 35-40% dry solids
*Only applicable for Newlisi Full

Option 2
Hydrolyzed sludge is sent to the anaerobic digester. Increase in biogas production over then 40%

The Newlisi solution is applicable to any type of plant, whether or not equipped with an anaerobic digester, since it is available in two different versions.

The organic fraction is first solubilised in the acid and alkaline oxidative hydrolysis phases and is then converted into oligosaccharides, peptones and free amino acids, which are totally biodegradable. The first phases completely break down the organic and inorganic compounds, while the subsequent phases consist of sedimentation and neutralisation.

The use of an oxidiser yields better results for sludge disintegration and produces various soluble compounds, often dominated by a series of short-chain fatty acids (SCFA) such as acetate, formate, propionate and valerate, which improve biogas production yield of the subsequent anaerobic digestion process.

The product of the conversion process is sent to the anaerobic digester or, in the absence of such directly to dehydration for solid/liquid separation section. The dehydrated sludge is sent to the top of the purification plant.

The process does not alter the possible usage of the sewage sludge but does make it more stable, sanitised and suitable for application in agriculture.

Newlisi Full

The solution can be applied to all purification plants

Input sludge with a 4-6% Total Suspended Solid (TSS) concentration

Heating of the sludge to a temperature of 80 – 85°C

Treatment in an acidic (strong acid) and oxidative condition

Static sedimentation

Alkaline phase treatment (soda or potash) with controlled dosing of an oxidiser

Neutralisation

Output for the anaerobic digestion phase, if provided for, or directly to the dehydration section

The Newlisi Full solution can be applied to all purification plants, whether or not they are equipped with an anaerobic digestion compartment.

The treatment phase of the sewage sludge consists of an acid oxidative hydrolysis (HCl+H2O2) phase followed by an alkaline oxidative hydrolysis (NaOH+H2O2) phase at low temperature (< 85°C) and at atmospheric pressure. Compared to conventional hydrolysis without oxidation, the use of an oxidising agent enables different operating conditions to be achieved, with a substantial change in the oxidation-reduction potential: this results in a considerable improvement in process performance in terms of sewage sludge reduction.

The Newlisi Full solution therefore allows for a reduction of over 70% in sludge for disposal. The process also enables biogas production to be increased by more than 40% where anaerobic digestion of hydrolysed sludge is being carried out.

Benefits

from 2,000 upto 10,000 kg/dTSS1 treatment line:

Benefits

Modular system: replicable for higher size

Operation with or withoutanaerobic
>70%Sludge reduction
40%Biogas increasewith an anaerobicdigester
up to 35%Dewateringefficiency increasesdry solids

Benefits

from 2,000 upto 10,000 kg/dTSS1 treatment line:

Modular system:
replicable
for higher size

Operation with or withoutanaerobic
>70%Sludge reduction
40%Biogas increasewith an anaerobicdigester
up to 35%Dewateringefficiency increasesdry solids

Newlisi Light

A technology that can be applied to all purification plants

Input sludge with a 4-6% TSS concentration

Heating of the sludge to a temperature of 80 – 85°C

Alkaline phase treatment (strong base) combined with the minimum dosage of an oxidising agent

Neutralisation

Output for the anaerobic digestion phase

The Newlisi Light process involves the pre-treatment of sludge to maximise biogas production in the anaerobic digestion phase.

The sewage sludge pre-treatment phase consists of a single thermo-alkaline oxidative hydrolysis phase at low temperature (< 85°C) and at atmospheric pressure.

Newlisi Light enables a reduction of about 50% in sludge for disposal and an increase in biogas production of more than 40%.

Benefits

from 2,000 upto 10,000 kg/dTSS1 treatment line:
Modular system: replicable for larger dimensions
>50%Sludge reduction
>40%Biogas increasewith an anaerobicdigester
up to 35%Dewateringefficiency increasesdry solids

Benefits

from 2,000 upto 10,000 kg/dTSS1 treatment line:

Modular system: replicable
for larger sizes

>50%Sludge reduction
>40%Biogas increasewith an anaerobicdigester
up to 35%Dewateringefficiency increasesdry solids
Newlisi S.p.A.

Copyright © 2022
P. IVA 06943170966 — REA MI–1924478
Capitale Sociale €96.500,00 i.v.

Newlisi S.p.A.

Copyright © 2022
P. IVA 06943170966 — REA MI–1924478
Capitale Sociale €96.500,00 i.v.