Abstract

Aiming at the problem of highly toxic Nitrogenous disinfection by-products (N-DBPs) produced by disinfection in the process of drinking water, two-point influent activated carbon-quartz sand biofilter, activated carbon-quartz sand biofilter, and quartz sand biofilter are selected. This study takes typical N-DBPs Dichloroacetonitrile (DCAN) as the research object and aromatic amino acid Tyrosine (Tyr), an important precursor of DCAN, as the model precursor. By measuring the changes of conventional pollutants in different biofilters, and the changes of Tyr, the output DCAN formation potential of the biofilters, this article investigates the control of DCAN generation of the two-point influent activated carbon-quartz sand biofilter. The results show that the average Tyr removal rate of the three biofilters during steady operation is 73%, 50%, and 20%, respectively, while the average effluent DCAN generation potential removal rate is 78%, 52%, and 23%, respectively. The two-point influent activated carbon-sand biofilter features the highest removal rate. The two-point water intake improves the hypoxia problem of the lower filter material of the activated carbon-quartz sand biofilter, and at the same time, the soluble microbial products produced by microbial metabolism can be reduced by an appropriate carbon sand ratio, which is better than traditional quartz sand filters and activated carbon-quartz sand biofilters in the performance of controlling the precursors of N-DBPs.

Highlights

  • The disinfectant used in the process of drinking water disinfection will react with most natural organic matter as well as producing harmful Disinfection by-products (DBPs) [1]

  • The effluent NH4+-N concentration of the biofilter gradually stabilizes in about 30 days, and the effluent NH4+-N concentration is between 0.14 and 0.47 mg/L, while the NH4+-N removal rate is above 60%

  • The two-point influent activated carbon-quartz sand biofilter is superior to other filters in removing conventional pollutants (NH4+-N and turbidity) and organic pollutants (CODMn and Tyr); the average NH4+-N removal rate is 80%, turbidity is 80%, CODMn is

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Summary

Introduction

The disinfectant used in the process of drinking water disinfection will react with most natural organic matter as well as producing harmful Disinfection by-products (DBPs) [1]. Dissolved organic nitrogen (DON) is the main precursor of N-DBPs [5], and the source control of N-DBPs is mainly to remove DON. The removal effect of conventional treatment processes (coagulation, flocculation, sedimentation, and sand filtration) is limited. The water quality analysis results from Xiang et al [8] showed that the biofilter process has a good effect on the removal of pollutants, especially organic micro pollutants. The biofilter process is selected as the focus on source control research

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