Zeolite for natural and waste waters
Ammonia nitrogen is particularly harmful in the wastewaters, the excess of the concentration limits of which is equivalent to the presence of a deadly poison to all alive, including for fish. To preserve fish resources, Japanspends from 2400 to 4800 tones of zeolites per year for its dispersal in the coastal territories of ocean, where the fish is spawning. Thus, $ 0.5 million is "released" in the ocean every year and it pays its cost.
Cleaning of agricultural and industrial effluents and emissions into the atmosphere - one of the most important zeolites usages in the world.
Data on ion-exchange properties of clinoptilolite show that they can be used for concentration and separation of large cations of alkaline, alkali-earth and some non-ferrous metals.
Zeolites are applied:
• In potable and industrial water systems;
• In the water treatment for heat and power companies (the previous purification of water);
• In the treatment and purification of waste water;
• In the treatment and purification of biologically treated urban waste water;
• At the previous clean-up in ion-exchange cycles of treatment.
Zeolite works successfully when it is required:
• Removal of heavy metals from industrial effluent using zeolites
• Removal of viruses, cyanides, trichlorethylene and emulsified oil products
• Removal of fluoride
• Removal of phenol
• Removal of tall oil and amines
• Cleaning of liquid radioactive waste (RW) zeolites
The material is an effective load for single-layer and multilayer filters.
Increased porosity (26-40%) adds high hydrodynamic characteristics of the material. Dirt holding capacity of filter allows you, in comparison with sand filling, increase of filter cycle at 6-12 times – what was demonstrated by the tests. This makes it possible to save considerably on the washing water in the electricity during washing. In this case, the impositions of load wash waters for a three years period in no higher than 10% of the volume.
In addition, zeolite, being a natural ion-exchange, allows you to combine the processes of adsorption and filtration. For example, the capacity of ion ammonium Nh4 + is, on average, 700 mg.ekv. / kg, and is provides sorption of metal cations Cs + - Rb + - K + - Ba2 + - Sr + - Na + - Ca2 + - Fe3 + - Al3 + - Mg2 + - Li +. Zeolite will selectively sorb radionuclides Sr90, Cs137, Co60, Ca45, Cr51 in solutions with high content of other cations. At the process of work can be reduced pollution of ion exchange resins, increasing their lifespan.
In this case, the low cost of natural zeolites determines the possibility of their use in sorption processes, without involving the regeneration of the resin.
The material can be regenerated