Abstract
With the anammox sludge as the inoculation sludge, the effect of different concentrations of Fe2+ and Fe3+ on the denitrification performance of the anammox reaction was explored by setting a control experiment.The results showed that when the Fe2+ concentration was 0.08mmol/l, the reactor had the best removal efficiency, the removal rate of NH4+-N was 89.14% after 60h, and the removal rate of NO2--N was 85.9%. The positive effect of Fe3+ on the anammox reaction was similar to that of Fe2+. From reading the literature, it can be known that Fe has a positive impact on anammox microorganisms in three aspects by promoting microbial enrichment, promoting the production of functional enzymes, and promoting microbial granulation.
Highlights
With the rapid development of science and technology, industry and agriculture are increasingly prosperous, and the excessive use of chemical fertilizers, pesticides, and industrial raw materials has severely damaged the environment on which we depend [1]
Pollution generated by human activities such as industrial wastewater and domestic sewage discharge can enter the aquatic ecosystem [3]
The metabolism of anammox microorganisms is slow and the generation cycle is long, which severely restricts the efficiency of nitrogen removal [6]
Summary
With the rapid development of science and technology, industry and agriculture are increasingly prosperous, and the excessive use of chemical fertilizers, pesticides, and industrial raw materials has severely damaged the environment on which we depend [1]. When people enjoy the convenience brought by advanced technology, they must face the harm caused by environmental pollution to human beings. Nitrogen is an environmental pollutant that cannot be ignored [2]. There are three common types of soluble inorganic nitrogen ions in aquatic ecosystems, such as ammonium (NH4+), nitrite (NO2-), and nitrate (NO3-), which can be degraded by the atmosphere, and natural effects such as surface and groundwater runoff. Pollution generated by human activities such as industrial wastewater and domestic sewage discharge can enter the aquatic ecosystem [3]. The metabolism of anammox microorganisms is slow and the generation cycle is long, which severely restricts the efficiency of nitrogen removal [6]. How to achieve stable operation of Annamox is a problem that scholars all over the world need to study in depth
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