Wastewater treatment is a series of processes employed to eliminate pollutants from wastewater (or sewage) and transform it into an effluent that may be: 1) restored to the water cycle with a lower effect on the environment   or, 2) directly reused  . The last is known as water reclamation as treated wastewater may be employed for different aims  . The remediation operation happens in a Wastewater Treatment Plant (WWTP), usually known as a Water Resource Recovery Facility (WRRF) or a Sewage Treatment Plant (STP). Contaminants in urban wastewater (households and small industries) are eliminated or decomposed  . Treating wastewater is a portion of the overarching domain of sanitation   . Moreover, sanitation comprises the management of human waste and solid waste as well as stormwater (drainage) management . By-products from WWTPs, like screenings, grit and sewage sludge are usually treated in a WWTP   .
This work briefly reviews the wastewater treatment technologies from the perspective of upgrading WWTP to obtain potable water.
2. Disposal or Reuse
Even if disposal or reuse happens next remediation, it should be thought about primarily. As disposal or reuse are the aims of handling wastewater, disposal or reuse choices are the foundation for treatment solutions. Passable pollutant concentrations can change following the kind of employment or site of disposal. Carriage costs usually render passable pollutant concentrations following the site of disposal; however, costly remediation needs can promote the choice of a disposal site following pollutant concentrations . Ocean disposal is related to international treaty requirements. International treaties may also regulate disposal into rivers crossing international borders. Water bodies completely inside the jurisdiction of a single nation may be subject to regulations of multiple local governments. Passable pollutant concentrations can change largely between various jurisdictions for disposal of wastewater to evaporation ponds, infiltration basins, or injection wells .
Biological techniques are usually used in handling wastewater. Such methods may comprise aerated lagoons, activated sludge or slow sand filters. Wastewater is transported to a WWTP via convenient pipes and infrastructure and the technology itself must be subject to regulation and controls. Handling wastewater is realized via separation of solids from liquids, frequently through sedimentation. Through gradually transforming dissolved material into solids, frequently a biological floc   , which is then settled out, an effluent stream of augmenting purity is formed  .
3.1. Phase Separation
Phase separation transforms contaminants into a non-aqueous phase. Phase separation may take place at in-between levels in a remediation succession to eliminate solids formed throughout oxidation. Grease and oil may be recuperated for fuel or saponification. Solids usually need dewatering of sludge in a WWTP. Elimination choices for dried solids change with the kind and concentration of pollutants eliminated from the water .
Solids such as stones, grit, and sand may be eliminated from wastewater via gravity if density distinctions are enough to beat dispersion via turbulence. Gravity separation of solids is the main remediation of sewage, where the unit process is named “primary settling tanks” or “primary sedimentation tanks”. It is likewise largely employed for dealing with various wastewaters. Solids that are denser than water will collect at the bottom of quiescent settling tanks. More sophisticated clarifiers furthermore possess skimmers to together eliminate floating grease such as soap scum and solids such as feathers or wood chips .
Usually, suspended solids and colloidal suspensions of fine solids can, frequently following some form of coagulation     , be eliminated via filtration by fine physical barriers differentiated from coarser screens or sieves by the capacity to eliminate solids smaller than the openings through which the water passes . Diverse kinds of water filters eliminate pollutants during chemical or biological processes defined below  .
Oxidation decreases the Biochemical Oxygen Demand (BOD) of wastewater and can lessen the poisoning of several contaminants. Secondary treatment transforms organic compounds  into carbon dioxide, water, and biosolids. Chemical oxidation is largely employed for killing microorganisms in water     .
3.2.1. Biochemical Oxidation
Secondary treatment via biochemical oxidation of dissolved and colloidal organic compounds  is largely employed in sewage treatment. Biological oxidation will preferentially eliminate organic compounds  beneficial as a food supply for the treatment ecosystem. The concentration of some less digestible compounds may be decreased through co-metabolism. Elimination performance is restricted by the minimum food concentration needed to endure the treatment ecosystem .
3.2.2. Chemical Oxidation
Chemical (including electrochemical  -  ) oxidation is employed to eliminate several enduring organic contaminants     and concentrations remaining after biochemical oxidation. Killing microorganisms through chemical oxidation demobilizes bacteria and microbial pathogens via injecting ozone, chlorine or hypochlorite to wastewater    .
Polishing alludes to treatments performed after the above techniques. Such treatments may likewise be employed separately for several industrial wastewaters. Chemical reduction or pH adjustment reduces the chemical reactivity of wastewater after chemical oxidation. Carbon filtering eliminates residual pollutants through chemical adsorption onto activated carbon (AC). Filtration via sand (calcium carbonate) or fabric filters is the most frequent technique employed in urban wastewater treatment .
4. Potable Reuse Case Studies
Through the world, there are several successful cases for water reuse such as: 1) Windhoek (Namibia, Goreangab Reclamation Plant), 2) California (Groundwater Replenishment System in Orange County, USA), 3) Virginia (Upper Occoquan Service Authority Potable Reuse Project in Virginia, USA), 4) Singapore (Water reuse in Singapore―NEWater), 5) Perth(Australia, Groundwater Replenishment), 6) Texas (Direct Potable Water Reuse in Texas, USA), and 7) South Africa (Water Reuse in South Africa: The eMalahleni Water Reclamation Plant) .
More details about these case studies may be found elsewhere .
5. Treating Municipal Wastewater: From Consolidated to New Advanced Treatment Techniques
Municipal wastewater treatment plants (WWTPs) remain between the major anthropogenic sources for the release of contaminants of emerging concern (CECs) into nature . This may conduct to poisonous and opposite impacts on aquatic organisms and thus on human beings. Regrettably, WWTPs are not planned to eliminate CECs; moreover, secondary (such as traditional activated sludge process, CAS) and tertiary (like filtration and disinfection  -  ) stages are not efficient in eliminating the most of CECs coming in WWTP. Consequently, various advanced treatment technologies have been examined for eliminating CECs from wastewater, comprising consolidated (that is, AC adsorption, ozonation, and membranes   ) and novel (like advanced oxidation processes (AOPs)  ) techniques. Rizzo et al.  reviewed the state of the art and the best available technologies for the advanced treatment of municipal wastewater. Especially, they deeply discussed the data  obtainable on consolidated (ozonation, AC and membranes  ) and novel advanced treatment methods (fundamentally AOPs) to assess (Figure 1): 1) their performance in
Figure 1. Municipal wastewater treatment from yesterday to tomorrow .
eliminating CECs from wastewater, 2) benefits and inconvenients, 3) likely barriers to using AOPs, 4) practical restrictions and mid to long-term estimations for employing heterogeneous processes, and 5) a technical and economic comparison between the numerous processes/technologies.
Rizzo et al.  concluded that:
1) Consolidated advanced urban wastewater treatment techniques, to be specific AC adsorption, ozonation, and filtration by nanofiltration (NF) or reverse osmosis (RO) membranes , can efficiently eliminate CECs. Numerous facilities using AC adsorption and ozonation have lately been put into action cost-efficiently at full scale in Germany and Switzerland. Filtration with narrow membranes  as employed in NF or RO was observed to be more cost-intensive. However, RO membranes  have been applied on a full scale in drinking reuse programs in the United States of America, Singapore, and Australia thanks to the supplementary advantage given concerning salinity and metal removal.
2) In geographical regions with elevated yearly average solar irradiation  (between latitude 40˚N and 40˚S), solar-driven AOPs seem competitive with different advanced treatment technologies for CECs reduction from municipal wastewater. The identical situation subsists for several innovative processes and fresh integrations of present techniques, which usually have been tested only at small-scale or under non-realistic source water conditions so far.
3) Removing CECs from wastewater via AOPs is a function of the working indicators, the matrix composition, and the elimination pathways taking place through the usage of each treatment technique. If implementing ozonation or AOPs, the formation of oxidation or transformation products with important biological impacts causes the requirement to carry out ecotoxicological investigations to assess the impact of such fresh products. A post-treatment using sand filters or AC has been found an appropriate design to beat with this problem following ozonation; however, it elevates treatment costs.
4) The large local diversity of CECs and of the water matrix render optimization fundamental for each implementation (adsorbent and/or flocculants selection  , choice of membranes  , injection modes, systems dispositions, mixing parameters, etc.). This shows the necessity for knowledge systematization and development of tools for the prediction of CECs behavior in wastewater treatment .
5) The absence of comparative studies among consolidated (AC adsorption and ozonation) and novel methods (that is fresh AOPs) restrain the categorical estimate of the most convenient and cost-effective choices for advanced treatment of municipal wastewater. Besides, site-specific restrictions (like availability of space and solar energy , cost of electricity) may conduct to diverse deductions for two various sites. Most importantly, these comparative examinations must be conceived and executed via considering diverse crucial endpoints for secure effluent discharge or reuse, like CECs removal, effluent poisoning, bacteria-killing , by-products reduction or removal, antibiotic resistance control, and treatment cost.
6. Endocrine-Disruptor Compounds (EDCs) Removal
Hormone active agents make a serious category of contaminants . Between them, those agents that imitate the work of estrogens on target cells and are part of the group of endocrine-disruptor compounds (EDCs) are named estrogenic EDCs (Figure 2). Subjection to such complexes occasions several unfavorable impacts, comprising breast cancer, infertility, and animal hermaphroditism. Nevertheless, mostly in underdeveloped countries, restricted attempts have been performed to alert people concerning this grave problem, elucidate the procedures of reducing exposure, and improve appropriate and performant alleviation programs in diverse fields and in several environments. For example, employing bioremediation methods able to converting EDCs into environmentally friendly chemicals has been little examined. A large variety of estrogen-degrading microorganisms could be employed to incubate such techniques, which comprise bioremediation methods for EDCs that may be applied in biological filters for the post-treatment of wastewater effluent. Vilela et al.  listed issues linked with EDCs, firstly estrogenic EDCs, comprising exposure as well as the current
Figure 2. Schematic representation of estrogens estrone (E1), estradiol (E2), estriol (E3) and ethinylestradiol (EE2) activities in the endocrine system affecting the body’s homeostasis .
case of comprehension and the influences of natural and synthetic hormones and estrogenic EDCs on living organisms. They presented possible biotechnological plans for EDC biodegradation and proposed new treatment techniques for reducing the presence of EDCs in the nature (Figure 3).
Indeed, it was established that five bacterial strains isolated from activated sludge were capable to decompose E2, and a strain of Bacillus subtilis was capable to decompose E2 in 4 days and diminish the concentration of estrogenic compounds . This bio-decomposition capacity could be helpful in diminishing the global estrogenic action in nature, by eliminating the four main estrogenic compounds existing in wastewater by bio-augmentation plans. This method may even be used in integration with additional actual techniques implying filters and treatment systems. It seems that the bio-decomposition of estrogens is an encouraging solution to remove such compounds in nature. In addition, it may be employed in integration with actual treatment systems .
Following such findings, to reduce more and finally eliminate estrogens in the water mediums, an estrogen-specific method could be implemented in WWTPs in integration with a biological filter . The biofilter must include the essential species of estrogen-degrading bacteria and could be used through the final treatment stage, to guarantee an effluent that is free of EDC poisoning. The proposed plan for this substitutional treatment employing biodegradation is
Figure 3. Schematic representation of the proposed wastewater-treatment process with the use of the biological filter as a step for the removal of estrogens .
illustrated in Figure 3. The plan presents the simplified treatment method for an effluent inflow, where the effluent firstly passes through preliminary and traditional treatment   (primary decanter, activated biological reactor and secondary decanter). In addition to such stages, the effluent would undergo a post-treatment stage termed “final polishing” (Figure 3), which implies the biological filter. This filter is abacterial support structure to which organisms     can adhere, and it works in aerated  and submerged environments. The principal estrogen-degrading bacterial groups would attach to this support. Subsequently, the totally treated effluent without the existence, or with diminished quantities, of EDCs could be liberated into water mediums    .
The main points drawn from this work may be given as:
1) Direct potable reuse of wastewater is more and more being seen as a solution source of water for satisfying societies’ future water supply necessities. This attention is attributed to diverse parameters comprising ameliorations in treating wastewater, enhanced comprehension of the chemistry and toxicology of micropollutants in water, and decreases in treatment costs. One more crucial parameter has been elevated public acceptance of the idea as a consequence of augmented consciousness of the shortage of various sources of supply and the exposure of water resources to the impacts of drought and climate alteration.
2) Treating wastewater at the highest level of purity to guarantee the drinking water supply remains the best approach to avoid the pollution expansion from wastewater even if it is partially treated to minimize its toxic impacts and provide water for irrigation and industrial use purposes. Treating wastewater at present in the actual wastewater treatment plants should be urgently upgraded to provide potable water through adding processes steps such as NF, RO, and adsorption on AC. Evidently, there is an additional cost for these sophisticated techniques to pay for the better future of the humankind.
3) Great alertness to hazards caused by pollutants will stay fundamental and much research necessities to be performed to define and keep exercises that assure public integrity. Worker guidance remains essential, as will investigation on efficient detection, treatment, and control.
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