Machinery and plants for treatment

As part of our service Ecological Industrial Plants, company Com-ing Trade offers you planning, engineering, supply of machinery and plants for treatment of:

• waste water,
• slop oil waste in refineries,
• county waste management centers,
• technological water in the process of food industry.

Continuous growth of population and settlements, and thus the standard of population combined with the constant reduction of water resources on our planet, leads to an increase in by-products such as increased waste and other types of pollution. By increasing human consciousness towards the environment, there is concern about the exploitation and disposal of waste and the waste water that has the most for the purpose of disposal, purification and re-use of such waters, and for this purpose are built wastewater treatment plants.
A sewage network through the pumping stations of waste water is collected on a wastewater treatment plant. The diagram above shows schematically one such plant. On such a wastewater plant, eastewater pass first through a rough grate, where solid waste is separated from the liquid. After that it passes through the primary and secondary tank for eraction and blowing. In the secondary tank, a part of such water is brought to the extent that it can be released into the environment, while the rest of the waste water goes to the precipitation where the waste water is adding the nutrients that break down the sludge and prepare it for dehydration.

PIERALISI technology and these decanters have proved to be very successful at this stage of wastewater treatment – dehydration, both in the world and in Croatia and in the neighboring countries where we are represented. Before the sludge goes to dehydration, it is necessary to measure the dry solid sludge input concentrations and select and prepare a polyelectrolyte that is necessary for better separation and obtaining greater dry solid outlet. When the polyelectrolyte is prepared, it is necessary to start the decanter and the sludge prepared for dehydration through the supply pumps is mixed before entering the polyelectrolyte in decanter in the mixer and that mixed sludge is entering in the decanter. In the decanter, the sludge separates through the gravitational force, where an aqueous film and a slip film are formed, and the water flows to the water side, and the dry dehydrated sludge on the opposite
side. The dehydrated sludge, after exiting the decanter, enters the screw conveyors where it enters the containers. Thereafter, such dried sludge is taken to the foreseen dump or incinerator. Depending on the capacity of the decanter, the concentration and quality of the input sludge and the well-chosen polyelectrolyte, the sludge yields up to 25%. The water coming out of the decanter goes to further purification in order to lower the BPK and KPC to
the appropriate measures, and purify it into streams, rivers, seas where as such it is unsuitable for the environment or reused for some other washing functions.