The Effect of Modified Magnetic Mesoporous Silica Nanoparticles on Water Disinfection

Conclusions

In this study, the disinfection of the drinking water with the modified magnetic mesoporous silica nanoparticles was investigated. First, raw water disinfection was conducted after the preparation of nanoparticles. Then, the pure water was contaminated artificially and the performance of these nanoparticles in the disinfection was investigated. Also, parameters affecting the microbial contamination were experimentally and artificially set and their effects on this process were examined.

Parameters such as pH, temperature, time, water mass flow rate and tha adsorbent amount were tuned separately and the effect of each parameter with and without other parameters was investigated. The obtained curves are presented in results section. The experiments were done by continuous phase method and disinfection index was based on the measuring factor MPN. In Flow method, a certain amount of the modified magnetic mesoporous silica nanoparticles was transferred into a column with a certain volume and contaminated water passed through it. The flow intensity was different for each measurement.

Water MPN was measured before and after passing the contaminated water. The optimal level of disinfection process was to achieve the biological standards for drinking water quality. Here, the output MPN was assumed to be 0.

The efficiency of the disinfection process was calculated using Chick-Watson law. For each method, Log (N/N0) values v.s. CT values were plotted. The obtained results show that the best PH in the disinfection process is 8. As the temperature increased, the system performance improved such that maximum absorption was in in T=35C. the absorption level increased over 99.82% with an increase in the adsorbent amount.