Drying technologies for sewage sludge

Sewage sludge treatment System solutions from a single sorce Reuse - Reduce - Recycle From waste to valuable substance by drying Dewatered sludge 25% DS 40–80% organic in DS Dried sludge > 90% DS 40–80% organic in DS Mechanical waste water treatment Sieves, Screens, Sand filters Dewatering Belt presses, Decanter centrifuges, Filter presses Drying Belt-, Drum- and Fluidbed drying systems Thermal utilization - direct with EcoDry - external (industry, agriculture) Agricultural utilizaton - fertilizer - landscaping Alternative fuel - coal-fired power plant - waste incineration plant Energy self-sufficient...

The right thermal process for each application Three technologies to offer custom-tailored solutions Three possibilities for the optimum path from waste to product Condensation (heat recovery possible) for small to medium evapoDewatered sewage sludge to make use of waste heat evaporated water for cleaning with temperatures > 90°C and heating steam < 6 bar Drum drying system (DDS) Preferred heating systems Direct with exhaust gas 350–600°C for medium to large evaporation capacities Belt drying system (BDS) if heating media >180°C and heating steam > 6 bar are Coal-fired power plant Waste heat...

Belt drying system Ideal for making use of waste heat Recovery of material and energy content taking waste gas heat from cement production as an example By creating a thermal and material link be- ash is used as an additive in cement pro- tween a sewage sludge drying plant and duction and thus reduces the amount of a cement kiln, an innovative concept is minerals used. obtained for conserving resources (energy The advantages ▪▪ Here, the thermal energy for drying the value and ash are used in cement pro- sewage sludges comes entirely from the waste gases from the clinker cooler in the 100% of...

Fluidized bed drying system Drying in a closed inert gas loop Energy-optimized integration of sewage sludge drying in sewage treatment plant operations The heat for drying the dewatered sewage Advantages for the sewage treatment sludge is taken entirely from the sludge gas. plant operator The sludge gas is used to heat the fluid- ized bed dryer with an efficiency of >90% Significant reduction in the residual substances leaving the sewage treat- in modern incineration plants. ment plant At the same time, the fluidized bed dryer provides the thermal energy to heat the digester. In the drying process...

Drum drying system Drying and granulating in a single step Energy efficiency from combined heat and power generating (with a gas motor for example) The electric current for operating the sew- age sludge drying plant is supplied by a gas motor operated as a co-generation unit. Having no direct contact between CHP waste gas and the dryer system results in simple safety management The thermal energy required for drum dry- ing is provided from the gas motor exhaust mode to burner mode without impair- air and also from their cooling water shell. Efficient heat recovery is a very important Fast and...

Safety engineering in ANDRITZ SEPARATION drying plants In this sector, dust explosions bear the highest risk potential. Measures must be implemented to prevent damage to individuals and to equipment as far as possible. Three requirements must coincide to create a dust explosion: Spark detection If at least one of these requirements can be reliably excluded, there will be no explosion. The primary safety measures derived from this and which are implemented in ANDRITZ SEPARATION belt dryers are strong dilution of any dust concentrations occurring, as well as monitoring of these concentrations and...

Service offered for drying plants It is part of the ANDRITZ SEPARATION strategy to provide high-quality equipment. ANDRITZ SEPARATION helps its customers to ANDRITZ SEPARATION offering for service contracts ANDRITZ SEPARATION service specialists help customers to keep machine and plant availability as high as possible. ANDRITZ SEPARATION as system provider and process know-how owner is aware of the many ways of optimizing a plant, reducing the operating costs, and increasing performance. In addition, ANDRITZ SEPARATION assists the operators of drying plants to keep their plant in line with the...

System solutions for sewage sludge Worldwide successful Fluidized bed drying Energy efficient and environmentally friendly With the sewage sludge drying plant in Shanghai Bailonggang, the largest sewage treatment plant in Asia, the three lines forming this fluidized bed drying plant are making a further contribution towards environmentally friendly disposal of the sewage sludges produced in wastewater treatment. The energy combination between digestion and drying permits high energy efficiency with the digester gases generated in the digester towers. Belt drying Use in the cement industry - sludge...