Sludge Dryer

Sludge Volume Reduction

The use of an HEI sludge dryer provides up to a 4 to 1 reduction of sludge volume. This results in a dramatic reduction of sludge disposal and handling costs and provides a rapid payback period. HEI manufactures batch process, as well as continuous process sludge dryers. The batch process dryers use steam, gas, or electric heat sources, while the continuous process dryers use either steam or gas.

Batch Process

The HEI batch dehydration system is designed to meet the stringent environmental requirements for thermal extraction equipment.

The design flexibility of the HEI batch dehydrator allows the system to be positioned directly beneath the filtration equipment whenever possible to save material handling.

Filter Press over 4 cu. ft. Batch Sludge Dryer

In cases where wet or dried material must be transported, HEI offers a complete line of material handling equipment.

The dehydration process is accomplished by externally heating the dehydration chamber with steam, gas, or electric heat and carefully controlling the internal dehydration temperatures and the dehydration steam exhaust.

Additionally, many wastes can be batch treated that are environmentally objectionable in a continuous dehydration system.

General operation of the HEI batch dehydration system consists of dropping a controlled amount of material through the dehydration chamber door. The process timer is set to the required dehydration time. A custom fabricated steel blender ribbon continuously turns the material exposing all surfaces for dehydration.

When the preset dehydration time (typical cycle is 5 to 6 hours) has elapsed, the unit automatically shuts down. At this time, the operator switches to the discharge cycle to allow automatic emptying of the machine.

HEI batch process dryers are available in various configurations and range in capacity from 4 cu. ft. to 100 cu. ft.

Continuous Process

The HEI continuous dehydration system is engineered to meet the state of the art technology required for the future of waste minimization. At the same time ease of maintenance, control modularity and flexibility have been maintained.

Filter Press over Steam Heated Continuous Process Sludge Dryer with Explosion Proof Control Panel

The design flexibility of the HEI continuous process dehydration system allows the system to be positioned directly beneath the filtration equipment whenever possible, in order to reduce material handling labor.

In cases where wet or dried material must be transported, HEI offers a complete line of material handling equipment.

The HEI indirect heat continuous process dehydration systems are available in models with process capacities from 3 to 20 cu. ft./hour.

General operation of the HEI system starts by dropping the material to be processed into the infeed blender. The drive system, turning the blender mechanisms, as well as the infeed auger, meters the material at an adjustable rate into the dehydration chamber(s). The material is subjected to indirect heat and discharged from the chamber in a dry aggregate similar to oil dry or freeze dried coffee. In special applications, the process material can be discharged in a finer consistency.

The drying process is accomplished by indirectly heating the insulated hot air chamber with steam or gas. Heat is transferred through the walls of the process chamber and into the material in process. This system allows for a totally indirect heated dehydration unit. Combustion gasses flow through a special manifold injection system into the process chamber to insure optimum efficiency.

The control of the continuous process is accomplished by means of a variable speed drive to meter the material from the hopper, and a second variable speed drive to convey the flow of material through the drying process.

© Hoffland Environmental Inc, 2012