Waste Water Treatment

Because of the high adsorption capacity as well as the cation exchange ability biochar is applicable as sorbent in sewage treatments and filtration plants. In many regions in Germany issues with pollutants in water have not been solved yet.

Also in emerging countries and townships the availability of hygienic drinking and potable water is very limited. The classical wastewater treatment is often done through a mechanical process (ie. sieves, rakes, followed by a decantation process) followed by a biological cleaning process (ie. Sewage fields, filtration, trickling filter, submerged bodies, sludge process, nitrate system, decay system) (Imhoff, Imhoff and Jardin 2009). Research shows that organic substances can be removed through absorption with activated carbon. But even with the activated carbon being able to remove organic substances from water ionic substances as minerals, salt and chalk remain in the water.

For those dissolved salts (ions) ion exchange materials are used. Pollutants as heavy metals, pesticides and substances from anthropogenic origin remain a huge issue in water. Through agriculture large quantities of nitrate are put into the soil and recur through the ground water.  Mercury, cadmium, uranium are some examples getting through artificial fertilizers in agricultural areas into the ground water. Even in low concentration those substances can be highly toxic. Several substances are used to clean water at very high costs and with low energy efficiency. Also the use of chlorine has been proved to be a risky and dangerous process. Pollutants of organic and non-organic origin in contaminated water can be immobilised through biochar filtration. The porosity as well as the large surface of biochar are two of the positive aspects why biochar is working well as a filter.

Furthermore biochar is negatively loaded with anions as hydroxyl- and carboxyl groups and therefore functions as cation-exchanger. (Lee et al., 2010; Meyer, Glaser and Quicker, 2011). In addition the carbon in biochar has a classical graphite structure. This enables the carbon to connect with neighbouring atoms or atoms from foreign molecules to establish linear or cyclical bondings (R.Schlögl, 1994). Through this the biochar becomes even more stabilized and increases its capacity as absorbent.

If you want to buy our biochar, please use our orderform directly for your purchase request.