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Innovative Integrated System to Dry Sewage Sludge

Technology Overview

The technology provider which is focused on innovative green technological solutions in the water treatment sector and dehydration processes, has developed a green innovative system to dry sewage sludge (wastewater treatment sector).  The proposed system aims to revolutionize the market of sludge management in the wastewater treatment plants, thanks to its innovative technology able to reduce up to 95% the sludge volume. Through the developed technology, sewage sludge is dried through an accelerated process and then combusted, producing only ash. The system cuts the electrical and fossil fuels costs and CO2 emissions, due to the engineering system and the energy sources used. Currently, all water-treatment plants use specialized equipment to extract water from the sludge, but only few of them have drying systems that can obtain a dry matter of 85-90%. The technology provider is looking for wastewater treatment companies and other organizations interested to adopt the technology through commercial agreement with technical assistance for optimizing it to the specific application process or technology cooperation for new developments or further applications.

Technology Features & Specifications

The proposed technology is an innovative system for drying biological sludge from WWTPs, designed as a combination of a traditional sludge oven and a solar greenhouse dryer, with low thermal and electric energy consumption. The system can burn dried sewage sludge, reducing the use of thermal and electrical energy. The dryer is dimensioned to be placed inside a naval container of 20 ft. (6 m). This solution allows that modules can be stacked, reducing the needed surface and meeting the different volume needs. The system treats around 1000 ton / year of sewage sludge, with an initial dry solids 25%.

Potential Applications

This technology is applicable to treat secondary biological sludge and so in the following industries that produce this kind of waste:

  • Waste Water Treatment Companies (Public & Private)
  • Water & Energy Companies
  • Municipalities & Civil Waste Water
  • Agro-Industry (slaughterhouses, dairying) Companies
  • Paper & Cellulose Producers

Market Trends and Opportunities

In 2010 the sewage sludge production in Europe was around 11,5 million of tons and in 2020 it is expected to be 13 million of tons (growth trend of 12%). Sludge disposal represents one of the main cost item of a treatment plant and this item goes around 30% - 50% of the total management costs. In a global point of view, the sewage sludge production is going to be 83 million of tons/years. Few companies are able to purpose an innovative technology to decrease the quantity of sludge to be disposed, decreasing the environmental impact and the costs, too.

Customer Benefits

  • Reduction in the sludge mass and volume, thus reducing the transportation costs
  • Less volume to be transported and consequently reduction of fossil fuels consumption, reduction of CO2 emissions and reduction of environmental pollution
  • High temperatures used in drying process, allowing the kill of pathogens and contributing to sludge stabilization
  • Dried and digested sludge has higher heating value and so sludge becomes a suitable combustible source
  • Dried sludge can be easily stored, without putrefaction phenomena, thanks to the absence of water
  • Unchanged organic content in the dried sludge, keeping the initial sludge characteristics

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