scholarly journals INTEGRATED APPROACH OF PHYCOREMEDIATION IN WASTEWATER TREATMENT: AN INSIGHT

2020 ◽  
Vol 5 (1) ◽  
pp. 8-12
Author(s):  
Nandini Moondra ◽  
Namrata D Jariwala ◽  
Robin A Christian
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Integrated Approach ◽  
Secondary Treatment ◽  
Tertiary Treatment ◽  
Treatment Alternative ◽  
Factors Affecting ◽  
Critical Activity ◽  
Secondary Contamination

Even after secondary treatment, wastewater has a high convergence of nutrients, which frequently causes eutrophication and different destructive impacts on biological systems. Wastewater treatment is a critical activity that must be considered necessary for the improvement of society. The secondary contamination of sludge formation and disposal also makes the treatment difficult. The vitality and financial amount required for tertiary treatment of wastewater remain an issue for local bodies, limiting its use for treatment. Hence, to address most of the challenges of sewage treatment, an algal-based system can be more affordable and biologically secure with the additional advantages of asset recuperation and reusing. Phycoremediation system even eliminates the need for tertiary treatment. The paper illustrates the benefits and challenges of phycoremediation, with some recent studies on microalgae as a wastewater treatment alternative along with the factors affecting the wastewater treatment through microalgae. The in-depth knowledge of the microalgal treatment in every aspect could result in an advancement to the conventional treatment process if applied in the field.

Wastewater Treatment Operations

2019 ◽  
pp. 89-254
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Settling Tank ◽  
Oxygen Demand ◽  
Primary Treatment ◽  
Human Consumption ◽  
Secondary Treatment ◽  
Tertiary Treatment ◽  
Insight Into ◽  
Intended Use

Sewage is treated by a variety of methods to make it suitable for its intended use, be it for spraying onto irrigation fields (for watering crops) or be it for human consumption. Sewage treatment mainly takes place in two main stages: primary and secondary treatment. In arid areas, where there is not enough water, sewage also undergoes a tertiary treatment to meet the demands of the drinking water supply. During primary treatment, the suspended solids are separated from the water and the BOD (biochemical oxygen demand) of the water is reduced, preparing it for the next stage in wastewater treatment. Secondary treatment consists of aeration and settling tank. This process removes 75-95% of the BOD. In case of trickling filter, BOD removal is up to 80%-85%. The water is then disinfected, mostly by chlorination, and released into flowing streams or oceans. Therefore, the main objective of this chapter is to provide a deeper insight into preliminary, primary, secondary, and tertiary treatment of wastewater and furthermore provide cognizance concerning design considerations of treatment units.

Occurrence and elimination of antibiotics at four sewage treatment plants in Japan and their effects on bacterial ammonia oxidation

2009 ◽  
Vol 59 (4) ◽  
pp. 779-786 ◽  
Author(s):  
Gopal Chandra Ghosh ◽  
Takashi Okuda ◽  
Naoyuki Yamashita ◽  
Hiroaki Tanaka
Keyword(s):  
Oxygen Uptake ◽  
Nalidixic Acid ◽  
Removal Efficiency ◽  
Treatment Process ◽  
Ammonia Oxidation ◽  
Oxygen Uptake Rate ◽  
Sewage Treatment ◽  
Secondary Treatment ◽  
Mixed Condition ◽  
Sewage Treatment Plants

The occurrence and elimination of seventeen antibiotics (three macrolides: azithromycin, clarithromycin and roxithromycin; five quinolones: ciprofloxacin, enrofloxacin, levofloxacin, nalidixic acid and norfloxacin; five sulfonamides: sulfadimethoxine, sulfadimizine, sulfamerazine, sulfamethoxazole and sulfamonomethoxine; and others: tetracycline, lincomycin, salinomycin and trimethoprim) were investigated at four full-scale sewage treatment plants in Japan. The highest concentration was recorded for clarithromycin (1,129 to 4,820 ng/L) in influent, followed by azithromycin (160 to 1,347 ng/L), levofloxacin (255 to 587 ng/L) and norfloxacin (155 to 486 ng/L). A vary inconsistence picture was obtained with negative to over 90% removal. Nalidixic acid (53 to100%) exhibited higher removal efficiency followed by norfloxacin (75 to 95%), levofloxacin (40 to 90%), ciprofloxacin (60 to 83%) and enrofloxacin (38 to 74%). Among macrolides, clarithromycin (50 to 88%) and azithromycin (34 to 86%) showed relatively higher removal efficiency than roxithromycin (−32 to 59%). For most of the antibiotics removal efficiency was higher in A2O and AO based secondary treatment process than CAS process. The effect of the antibiotics on bacterial ammonia oxidation determined by oxygen uptake rate presented that there was no significant effect below 0.05 mg/L of each antibiotics. Even at the same concentration, antibiotics in mixed condition had higher inhibition effects than individuals.

scholarly journals Unravelling diversity and metabolic potential of microbial consortia at each stage of leather sewage treatment

RSC Advances ◽  
2017 ◽  
Vol 7 (66) ◽  
pp. 41727-41737 ◽  
Author(s):  
Hebin Liang ◽  
Dongdong Ye ◽  
Lixin Luo
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Microbial Consortia ◽  
Biological Wastewater Treatment ◽  
Metabolic Potential ◽  
Ecological Functions ◽  
Wastewater Treatment Process ◽  
System P

Activated sludge is essential for the biological wastewater treatment process and the identification of active microbes enlarges awareness of their ecological functions in this system.

A dispersed-ozone flotation (DOF) separator for tertiary wastewater treatment

2006 ◽  
Vol 53 (9) ◽  
pp. 151-157 ◽  
Author(s):  
P.K. Jin ◽  
X.C. Wang ◽  
G. Hu
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Quality Standards ◽  
Tertiary Treatment ◽  
Chlorine Disinfection ◽  
Very High ◽  
Total Bacteria ◽  
Better Than

A dispersed-ozone flotation (DOF) separator was devised for a pilot study of tertiary wastewater treatment for re-use purposes. As a compact device combining coagulation, ozonation and flotation in an integrated unit, the DOF separator achieved a very high removal of SS, TOC, UV254 and colour, as well as effective inactivation of coliform and total bacteria within a short hydraulic retention time of 30 min. The finished water quality is comparable to or better than that by a conventional tertiary treatment process using coagulation, sedimentation, filtration and chlorine disinfection, and meets the quality standards for non-drinkable domestic reuse.

Studies on the Contact Biofilter as a Compact Process in Domestic Sewage Treatment

1986 ◽  
Vol 18 (7-8) ◽  
pp. 185-192
Author(s):  
I. Somiya ◽  
H. Tsuno ◽  
Y. Ono
Keyword(s):  
Retention Time ◽  
Granular Medium ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Secondary Treatment ◽  
Organic Substances ◽  
Treatment Performance ◽  
Short Retention Time

This paper describes the treatment performance of a newly developed compact treatment process, named the “contact biofilter”. It is composed of a submerged biofilter and a granular medium filter. The research experiments on the process were conducted using domestic sewage. It was clearly shown that this process could reduce SS and total BOD in effluent to below 10 and 20 mg/l, respectively, in a short retention time, and it can be used as a secondary treatment process. The organic substances in sewage are effectively recovered as sludge without extensive mineralization.

Evolution of bacterial consortia in an integrated tannery wastewater treatment process

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87380-87388 ◽  
Author(s):  
Hebin Liang ◽  
Dongdong Ye ◽  
Pan Li ◽  
Tingting Su ◽  
Jiegen Wu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Bacterial Communities ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Physicochemical Characteristics ◽  
Tannery Wastewater ◽  
Illumina Hiseq ◽  
Wastewater Treatment Process ◽  
Bacterial Consortia

PCR-DGGE and Illumina HiSeq revealed the composition of bacterial communities in tannery sewage treatment and their linkages with the physicochemical characteristics of wastewater.

scholarly journals ROLE OF PHYCOREMEDIATION IN DOMESTIC WASTEWATER TREATMENT

2020 ◽  
Vol 5 (2) ◽  
pp. 53-57
Author(s):  
Nandini Moondra ◽  
Namrata D Jariwala ◽  
Robin A Christian
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Secondary Treatment ◽  
Organics Removal ◽  
Treated Effluent ◽  
Domestic Wastewater Treatment

Conventional domestic wastewater treatment in most developing countries is confined to secondary treatments, mainly focusing on solids and organics removal, which results in eutrophication when the effluents are discharged into receiving bodies. Thus, to resolve the issues associated with the conventional treatment system, in the present study, microalgae was introduced in the primary treated effluent collected from a sewage treatment plant to study the efficiency of the system in reducing eutrophication and other challenges of secondary treatment. Phycoremediation is an effective and eco-friendly treatment alternative that reduced the primary-treated effluent’s PO4-P, NH3-N and COD concentration to 97.89%, 98.81%, and 88.24%, respectively at the identical HRT practiced for secondary treatment. One-way ANOVA was also conducted to determine the effectiveness of the system statistically. The experimental and statistical analysis proved that microalgal treatment could resolve the challenges of conventional secondary treatments if adopted for domestic wastewater.

A Novel Predictive PID Control Method for SBR Wastewater Treatment Process DO Control

2014 ◽  
Vol 955-959 ◽  
pp. 1437-1442
Author(s):  
Hai Bo Yu ◽  
Yu Zhao Feng ◽  
Wei Peng ◽  
Li Wei Sheng ◽  
Hong Lu Li ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Pid Control ◽  
Treatment Process ◽  
Control Method ◽  
Batch Reactor ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Wastewater Treatment Process ◽  
Do Control

Sequencing Batch Reactor (SBR) wastewater treatment process has lots of characteristics, such as randomness, time-varying characteristics, complexity and so on. In order to solve the above problems, a predictive PID control method based on DMC and ordinary PID for SBR wastewater treatment process dissolved oxygen (DO) control was proposed. The simulation studies were conducted with the MATLAB in a sewage treatment plant. The results showed that the proposed predictive PID control method was robust and jamproof. Meanwhile, the wastewater treatment system also had a strong capacity of shock load.

Effect of the rotifer Lecane inermis, a potential sludge bulking control agent, on process parameters in a laboratory-scale SBR system

2013 ◽  
Vol 68 (9) ◽  
pp. 2012-2018 ◽  
Author(s):  
Wioleta Kocerba-Soroka ◽  
Edyta Fiałkowska ◽  
Agnieszka Pajdak-Stós ◽  
Mateusz Sobczyk ◽  
Małgorzata Pławecka ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Control Agent ◽  
Batch Reactors ◽  
Activated Sludge Process ◽  
Filamentous Bacteria ◽  
Wastewater Treatment Process

The influence of a high density of rotifers, which is known to be able to control filamentous bacteria, on the parameters of an activated sludge process was examined in four professional laboratory batch reactors. These reactors allow the imitation of the work of a wastewater treatment plant with enhanced nutrient removal. The parameters, including oxygen concentration, pH and temperature, were constantly controlled. The experiment showed that Lecane rotifers are able to proliferate in cyclically anaerobic/anoxic and aerobic conditions and at dissolved oxygen concentrations as low as 1 mg/L. In 1 week, rotifer density increased fivefold, exceeding the value of 2,200 ind./mL. The grazing activity led to an improvement in settling properties. Extremely high numbers of rotifers did not affect the main parameters, chemical oxygen demand (COD), N-NH4, N-NO3, P-PO4 and pH, during sewage treatment. Therefore, the use of rotifers as a tool to limit the growth of filamentous bacteria appears to be safe for the entire wastewater treatment process.

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