Paper industry is an indispensable link in modern society. However, paper making industry causes a lot of pollution and produces lots of waste water or sludge. With increase demand in paper and expansion of industrial scale, environmental pollution of our country's paper industry has become increasingly serious. Nowadays, with rapid development of science and technology, government's efforts to control and protect environment are stricter day by day. It is stipulated that wastewater from paper mills must be cleaned up by chemical and other technical methods after it is produced. Sewage can only be discharged after reaching safety standards. However, treatment of wastewater will also produce new pollution, namely paper sludge.
  Papermaking sludge is a kind of bio-solid waste which not only contains a large amount of cellulose organic matter and plant nutrients such as NPK. Papermaking sludge also contains trace heavy metals and pathogenic bacteria. According to current national policies and regulations, paper sludge needs to be recycled and processed by qualified companies uniformly. By using papermaking sludge dryer to deal with sludge, weight of sludge can be greatly reduced and cost of sludge recovery treatment can be greatly decreased. In fact, papermaking sludge is not useless and its organic content is even as high as 50%. It mainly contains high-molecular organic matter, such as cellulose, hemicellulose, lignin, and fillers and coagulants, but does not contain heavy metals. It is a biomass resource. However, it is very difficult to handle. No matter what kind of disposal method, secondary pollution to environment is easily caused.  Therefore, while dealing with papermaking sludge, more attention should be paid to the resource utilization of sludge, similar to making plates, compost and etc., which can reduce environmental pollution caused by incineration and soil burial. It can also make full and reasonable use of residual value of papermaking sludge. Thus, resources can be saved.
  According to Zonelion Taeda®'s many years of experience, sources of papermaking sludge are different and diverse, so sludge types are not single. Roughly, paper making sludge is divided into biological sludge, alkali recovery sludge and deinking sludge. Among them, biological sludge is mostly composed fine fibers. Major component of alkali recovery sludge is precipitated calcium carbonate. Deinking sludge mainly contains cellulose and fillers and coatings in original paper, as well as some short fibers, coarse slag and ink particles mainly composed of inorganic and organic matter. Inorganic substances mainly come from fillers and coatings in paper and ink particles whose main components are clay, calcium carbonate and talc. Composition of organic matter is more complex, including fine fibers and short fibers. In addition, deinking plant will produce a large amount of dry ink sludge or wet ink sludge during the processing of waste paper pulp.
  At present, main treatment methods are resource utilization after drying. Then proceed to resource disposal. Common resource recycling application methods are ①Using sludge to reuse paper and cardboard for papermaking; ②Using sludge to make building materials; ③Using sludge to make adsorbents and paper sludge will decompose to produce biochar after being heated; ④Using sludge incineration to generate electricity; ⑤Using papermaking sludge to compost. Based on above resource utilization methods, TEDA can design specific papermaking sludge drying solutions and can also provide entire advanced treatment technology and equipment manufacturing support services.
  In terms of sludge drying and quantity reduction, Zonelion Taeda® recommends following drying technologies and equipment that have been optimized for many years and are highly praised: low temperature belt drying system, waste heat low temperature drum drying system, steam rotary drum drying system, drum sludge drying system and air swept rotary wing drying system. You can click on the "Recommended Process" below for details of above dryers and corresponding technologies. You can also call us directly for quotation and technical support.

* Three-new advantage: form long-term cooperative relations with universities and scientific research institutions to provide new technologies, new ideas and new directions.
* Three-speciality advantage: Professional manufacturing and R&D on drying equipment, combination with professional testing institutions and cooperation with professional research and design institutes. We can provide full-process services from project planning, blueprint design to finished product testing, environmental assessment and laboratory construction.
* Three-deep advantage: Production line holds wide application range and can cover each circle. Process details and equipment design are deeply optimized based on multiple working cases, different projects and years’ R&D.
* Three-large advantage: Taeda holds large standard mechanical manufacture base and establishes cooperation with universities and professional institutes. Taeda also have multiple large automatic manufacture processing lines.
* Three disposal advantages: It can be used for quantity reduction, stabilization, harmless and recycling for paper making sludge. It can be made into fertilizer, fuel, incineration, building materials, biofuel, landfill cover and land use.
* Three-low advantage: featured in safe running, no explosion-proof risk and no need nitrogen charging operation. During sludge drying process, oxygen and dust content are low and material temperature is low. Moisture of final sludge is low (can be adjusted between 10-40%) and it can meet demands of different processes.

• Low-temp Belt Drying System
• Exhaust Heat Drum Drying
• Steam Rotary Drying System
• Rotary Drum Drying System
• Air Swept Drying System