Nanoadsorbents in waste water treatment

-

One of the best techniques applied for the decontamination of wastewaters from dyes and heavy metals is by the use of potential of nanomaterials as nanoadsorbents. Nanomaterials hold a series of distinctive physical and chemical properties. One thing very important about nanomaterials is that most of the atoms which have high chemical activity and adsorption capacity are situated on the surface of the nanomaterials. Various nanoadsorbents were elsewhere overviewed in treating contaminated water; their advantages and drawbacks in such applications were evaluated. The implications of nanoadsorbents to public health and their way forward for facilitating environmental sustainability are great as well.


Nanomaterials | Special Issue : Nanocontainers, Nano-Adsorbents, and Their Polymer Composites

 

Facile synthesis of yeast cross-linked Fe3O4 nanoadsorbents for efficient removal of aquatic environment contaminated with As(V) - ScienceDirect

Nanoadsorbents for water and wastewater remediation - ScienceDirect

Among these the iron oxide nanoadsorbents are cost-effective adsorbents that provide high adsorption capacity, rapid adsorption rate and simple separation and regeneration.

A lot of analysts have been using nanoparticles like adsorbents in order to get rid of water pollutants including arsenic after changing  properties of nanoparticles by improving reactivity, biocompatibility, stability, charge density, multi-functionalities, and dispersibility. Also in order to achieve arsenic removal, nano adsorbents emerged as the potential alternatives to existing conventional technologies. The recent studies have critically reviewed the past and current available information on the potential of nano adsorbents for arsenic removal from contaminated water and the challenges involved in that. The study discussed the separation and regeneration techniques of nano adsorbents and the performance thereof, and evaluated the adsorption efficiency of various nanoparticles based on the size of nanoparticles, types of nano adsorbents, method of synthesis, separation and regeneration of the nano adsorbents. The study found out that more studies are required on suitable holding materials for the nano adsorbents to improve the permeability and to make the technology applicable at the field condition. The study will help the readers to choose suitable nanomaterials and to take up further research required for arsenic removal using nano adsorbents.


Comments

Post a Comment

Popular posts from this blog

SLUDGE REDUCTION POTENTIAL OF METAZOA

-
Image
 A way to reduce excess sludge production and enhance mineralization is to retain the sludge completely in a treatment plant, which can be achieved by a membrane separation process. There the sludge concentration is expected to stabilize at the level at which energy supplied is fully utilized for maintenance purpose. Another way to enhance mineralization and reduce the sludge production is to exploit the organism in the process that predate on bacteria (sludge), by promoting their growth in an extra “grazing stage”. During energy transfer from bacteria to higher trophic level organisms, energy is lost due to inefficient biomass conversion and thus the predator may make a large contribution to biomass replacement. A long sludge retention period in membrane bioreactors (MBR) is very suitable for the abundant growth of these higher organisms. This predatory population in the system can be exploited to enhance mineralization and reduce sludge production.  High metazoa density leads to high
Read more

Pseudomonas in wastewater treatment

-
Image
Pseudomonas in wastewater treatment-  Source- Céline Slekovec, Julie Plantin, and Didier Hocquet  Pseudomonas is a genus of Gram-negative, Gammaproteobacteria, belonging to the family Pseudomonadaceae and containing 191 validly described species. The members of the genus demonstrate a great deal of metabolic diversity and consequently are able to colonize a wide range of niches. Pseudomonas aeruginosa was isolated consistently from domestic and hospital sewage. In domestic sewage the numbers were usually less than 30,000 per 100 ml whereas counts above 500,000 per 100 ml were frequently obtained in hospital sewage. Correspondingly high counts of Escherichia coli were not found in hospital sewage and the ratio of E. coli to P. aeruginosa was usually less than 25 compared to ratios of over 500 often found in ordinary domestic sewage. During passage through sewage treatment plants the numbers of both bacteria were reduced by about 90% so that their ratio in the effluent remained the same
Read more

ANAEROBIC FERMENTATION

-
Image
  Most of the organics in the sewage sludge were transformed into useful energy by the anaerobic fermentation of microorganism. Plenty of nitrogen, phosphate, potassium could be separated from the leachate produced in this fermentation which makes the recycling of sewage sludge much easier. This method could also help stabilize and decrease the amount of sewage sludge and make it harmless.  Here is a brief account on the mechanism of this process. The sewage sludge samples are taken in conical flasks; the flasks were sealed and kept in an airtight and anaerobic condition. Then the conical flasks were kept in thermostatic water bath box, controlling the temperature at 95°C to improve the efficiency of the anaerobic fermentation of the sewage sludge. The conical flasks were taken out and put into a container with oxygen at the 2th, 7th, 10th, 14th, 17th, 21th, and 28th day after the beginning of the anaerobic fermentation, respectively. When the flasks were taken out, a little of the sew
Read more