Correction:Surface Water and Groundwater Quality in South Africa and Mozambique—Analysis of the Most Critical Pollutants for Drinking Purposes and Challenges in Water Treatment Selection(Water, (2020), 12, (305), 10.3390/w12010305)

Abstract

In the original publication [1], there were some mistakes related to the citations in the text and in the final reference list: (1) In the legend of Figure 5 number 37 must be replaced by number 36. The correct legend appears below: Figure 5. Observed concentrations of microorganisms (circles) in surface water in the reviewed studies referring to South Africa and the corresponding limits set by SANS-241 (red dashes) for drinking water. In the X axis, the underlined names refer to indicator bacteria, those not underlined refer to pathogen bacteria. Data from: [2,3,28,36,44,51,56]. (2) In the fifth paragraph of Section 3.1. Occurrence of Macro-Pollutants, Inorganic Chemicals, PAHs, and Microorganisms in Surface Water, the cited reference is not the correct one: number 29 must be replaced by number 30; The correct paragraph appears below: A high level of arsenic in surface water may also be due to agricultural drains, local sediments disposal, and pollutants falling to the ground which have been emitted from incineration of municipal and industrial wastes as well as to geochemical origin, as discussed in the following. However, mining activities remain one of the main sources of surface water pollution. The maximum value reported in Figure 3 refers to a rural area characterized by the presence of mining activities [30]. (3) In the eighth paragraph of Section 4. Discussion and Conclusions, one cited reference is not correct: number 68 must be replaced with number 67. The correct paragraph appears below: In addition to turbidity and microorganisms, which may reach very high values in the case of rain events [10], it was found that the most critical compounds are metals. The coagulation-precipitation treatment is the recommended step able to reduce suspended solids and metals. In this context, the system proposed by [71], known as PRE-Disinfection- Column PREDICO, could be a valuable solution as a pre-treatment: it combines coagulation– flocculation, lamellar sedimentation, and filtration into a single-column unit. In addition, it is able to treat highly polluted surface water which may occur quite often in South African and Mozambican rivers. It is also able to act as a reliable barrier for the subsequent disinfection steps which could be performed by conventional chemical systems (namely chlorination [69]) as well as by the electrochemical disinfection steps investigated in [67,72] by means of the CabECO© cell, specifically tested in surface water in RSA and MZ. (4) There were some mistakes in the final reference list. The correct one appears below. The authors state that the scientific conclusions are unaffected. This correction was approved by the academic editor. The original publication has also been updated.