SEBIGAS uses a combination of expertise, research and flexibility to create tailor-made recipes for its customers, designed to meet the need to treat varied and complex biomasses in anaerobic digestion plants.

The company has worked in the international market for many years, developing and managing over 70 biomasses, and proving to be an expert and reliable partner in this field. From Agricultural by-products, energy crops and animal manure, to agro-industrial by products, slaughterhouse waste, OFMSW and wastewater.



The SEBIAGRI line offers farms and Food&Beverage companies a technical solution for exploiting a variety of organic materials, including livestock waste, agricultural by-products, agro-industry by-products, second crops and energy crops.

SEBIGAS reliability, expertise and professionalism guarantee a compete and efficient solution to make agricultural and agro-industrial companies modern and sustainable.



SEBIAGRI-FARM provides a structured method for exploiting agricultural by-products, energy crops and animal manure. This is a technical solution for the use of substrates for the constant production of sustainable energy, that can benefit both the business itself and society.

The SEBIAGRI-FARM line allows the company to round off the production cycle in a virtuous way: the energy produces can not only be sold to the national grid, but also recovered for internal activities, while the digestate becomes an ecological and economical alternative to synthetic fertilisers.

fruit and vegetable waste, straw, leaves and cobs…
sorghum, triticale, corn, hay, napier grass…

from cows, pigs, sheep, poultry, horses…

Tecnologia biogas



Location: Castelvisconti (CR)

Year of installation: 2011

Feeding: pig manure, rye silage, maize silage

Installed power: 625 kW

Use of electrical/thermal energy: The electricity is sold to the grid with a special feed-in tariff. The thermal energy is used to heat a cultivation of organic spirulina algae

Digestate: Used as a source of nitrogen for the soil


Location: Niella Tanaro (Cuneo)

Year of installation: 2015

Feeding: cattle slurry and manure with straw

Installed power: 300 kW

Use of electrical/thermal energy: The electricity is sold to the grid with a special feed-in tariff. The heat is reused in the farm’s production cycle and to heat the digesters

Digestate: Used as a fertiliser and soil improver, replacing synthetic products


SEBIAGRI-FOOD is a solution designed to provide an efficient and effective way to treat agro-industrial by-products, such as those derived from the production of coffee, sugar, ethanol, fruit juices, alcoholic beverages, dairy products, oil, rice and other cereals, tomato sauce, and also slaughterhouse waste.

The SEBIAGRI-FOOD line involves pre-treatment solutions such as sanitisation, pasteurisation and sand removal, for dealing with more complex materials. After leaving the plant, the solid and liquid digestate undergo special treatments to upgrade them into soil improvers, fertilisers and purified water.


resulting from the production of coffee, sugar, ethanol, fruit juices, alcoholic beverages, dairy products, oil, rice and other cereals, tomato sauce, and slaughterhouse waste

Tecnologia biogas



Location: Salonicco (Grecia)

Year of installation: 2017

Feeding: cattle slurry, slaughterhouse waste, expired food, beer production waste, whey.

Installed power:  1 MW

Use of electrical/thermal energy: The electricity is fed into the grid, the heat is used for heating the buildings, the pasteurisation system and the digester

Digestate: Used as an organic fertiliser for animal feed crops


Location: Gramat (Francia)

Year of installation: 2018

Feeding: Slaughterhouse waste and by-products

Installed power:  1.800 kW

Use of electrical/thermal energy: The electricity is fed into the grid under an incentive scheme, the thermal energy is used to heat the digesters and for the pasteurisation process

Digestate: Used as an organic fertiliser for the crops around the plant


SEBIGAS has developed a practical solution for treating the Organic Fraction of Municipal Solid Waste (ORMFS) based on studies of the methods and processes of the anaerobic wet digestion system, and research not specific techniques for the pre-treatment and use of digestate.

This OFMSW is collected from domestic users and/or selected sources such as the Ho.Re.Ca sector and large retail organisations, using a collection network that delivers the partially selected organic waste to the entrance of the plant.  The SEBIGAS system separates the organic from the residual inorganic material (non-reusable fractions) and transforms it into biomethane, purified water and mixed composted soil improver..

What are the advantages of using OFMSW in anaerobic digestion?

  • Complete use of the waste
  • Reduced disposal costs
  • Production of electrical, thermal energy or biomethane
  • Production of quality compost and purified water for use in agriculture

from door to door collection


from hotels, restaurants, catering companies, bars
and cafés (Ho.Re.Ca)


from large-scale retailers and distributors


As the OFMSW is varied and contains many impurities, it is very important to use a pre-treatment process to remove the inert matter and prevent it entering the anaerobic digestion system. It is also essential to carry out post-treatment of the digestate, to ensure it complies with regulatory standards governing reuse and/or discharge into the environment.

These plants are characterized by 3 macro areas, designed specifically to manage the gathered substrates:


  • PRE-TREATMENT : specific equipments for the opening of  bags, sieving and sand removal, removal of plastics and metals and the homogenisation of the organic suspension
  • ANAEROBIC DIGESTION: wet anaerobic digestion with distinctive features able to ensure the stability of the biological process and maximize the substrates management


  • DIGESTION OF LIQUID FRACTION: The substrate leaving the digester continues on to the dewatering stage (solid/liquid separation). These effluents can only be discharged into a body of surface water after they have been subjected to biological treatments that enable to produce a form of a wastewater with characteristics consistent with the minimum requirements of legislation.
  • COMPOSTING OF THE DIGESTATE : the separate solid fraction is mixed with ligno-cellulosic material (bulking agent) and then subjected to a process of bio-oxidation. The material is then stored in heaps and left to mature, before its final use in agriculture or for packaging.



Location: Sarmato (PC)

Year of installation: 2019

Feeding: 50.000 t/y OFMSW and 5.000 t/y green waste from public spaces

Biomethane production: 5.100.000 Sm³/y

Production of compost:  10.000 t/y

Liquid effluent into surface water bodies: 36.000 m³/y


Public and private companies are increasingly keen to adopt sustainable solutions for the treatment of sludge, produced at both civil and industrial level. Sewage sludge can be efficiently managed and treated, turning it into a valuable resource for the circular economy.

As well as a high-water content, it also contains various organic and inorganic substances, nutrients and bacteria (including some pathogenic forms), and so requires an initial purification treatment..

What types of sludge are treated in anaerobic digestion? 

  • PRIMARY SLUDGE: derived from the process of primary sedimentation. With a biogas yield of about 300-400 Nm3/tODS, this type has good methane potential and is readily digestible.
  • SECONDARY SLUDGE: this derives from the sedimentation produced through processes of biological oxidation. As digestion takes places through an aerobic process, this sludge is less efficient in terms of biogas production (200-300 Nm3/​​tODS​)



  • It allows sludge to be reused for energy purposes, enabling a supply from renewable sources.
  • It reduces and optimises treatment management costs
  • It makes an efficient use of resources, by allowing the reuse of water in industrial processes
  • It reduces the bacterial load in sludge
  • It reduces the amount of sludge that has to be disposed of, and so cuts the costs of disposal.

Which businesses are the main producers of industrial wastewater?

  • Companies that produce meat, fish and dairy products
  • Soft drinks companies
  • Breweries
  • Confectionery companies
  • Paper mills
  • Textile industry



meat, fish and dairy processing companies, soft drink companies, breweries, confectionery companies, paper mills, the textile industry…


Municipal sludge refers to the type sludge produced in urban wastewater treatment, which contains pollutants of various kinds. This is a fairly thick residue, composed mainly of water, organic matter, macro and micro-nutrients and inert substances.


sludge from sewage treatment and urban wastewater treatment plants

The digester and purification system are two complementary and integrated processes, which help to stabilise the sludge and reduce its odorous impact. The anaerobic digester unit can be inserted into the purification system at various stages, depending on the process or the requirements of the plant.

Technical benefits of anaerobic digestion of sludge:

  • Reduces the amount of sludge to be disposed of, and the relative costs
  • Reduces the energy costs of the existing treatment plant
  • Reduces the bacterial load and odour, as a result of stabilising the sludge
  • Enables the carbon to be fixed in the form of humus, with slow release of CO₂.