Biotechnology of Underground Waters Treatment with Ferrobacteria Under the Influence of Constant Magnetic Field

In the modern global field of underground water treatment, the technology of biological iron removal is gaining more and more recognition, as it has a number of significant advantages compared to traditional ones, namely: increased rates of Fe(II) oxidation, filtration, as well as a large dirt capacity of the filter filling. Therefore, the search for methods to activate cellular metabolic processes has practical implications. One of the possible ways of such activation is by using the effect of a constant magnetic field (CMF) on communities of ferrobacteria attached to the contact loading of bioabsorbents made of synthetic material. Based on the results of the research, it has been established that the CMF with an induction value of 5–10 mT is the most favorable for the development of ferrobacteria colonies, while the induction of 130–150 mT, on the contrary, inhibits their development. There has been studied the effect of CMF with the power of 10–15 mT on the efficiency of combined processes of treatment from dissolved organic compounds and Fe(II). The results of comparative studies on the effectiveness of various technological schemes are presented. It was found that with the use of CMF with a magnetic induction of 5–10 mT, the effect of iron removal increases by 20%. There has been developed biotechnology for treating weak acid (pH 6.3–6.5), iron-containing (Fe2+ 6–8 mg/dm3) underground waters which is based on the combinatorics of physical (aeration, influence of constant magnetic field) and biochemical (use of ferrobacteria consortia) methods. The main technological parameters of the process: filtration rate for the bioreactor 7–10 m/h, for filters 6–8 m/h; duration of filter cycles for the bioreactor is 2–3 weeks; for filters 44–48 hours have been determined. The theoretical aspects of the impact of CMF on the processes of biochemical treatment of underground water have been substantiated.