Hence the MgO is a good precipitating agent for removal and recovery of chromium from tanning wastewater. Key words: Chromium, removal, recovery, precipitation, tannery wastewater INTRODUCTION Chromium solutions are widely used in many industrial processes such as chrome plating, wood preserving, textile dyeing, pigmenting, Cr chemical ...
the tannery wastewater to that of Cr (VI) ion was because it is one of the most harmful heavy metals to human and the environment at large. More so, it was the metal of interest in this study. Therefore, emphasis was laid on the removal Cr (VI) ion and not in the .
The discharge of untreated tannery wastewater containing biotoxic substances of heavy metals in the ecosystem is one of the most important environmental and health challenges in our society. Hence, there is a growing need for the development of novel, efficient, ecofriendly, and costeffective approach for the remediation of inorganic metals (Cr, Hg, Cd, and Pb) released into the environment ...
COD and TSS removal from the tannery wastewater. For the statistical design of experiments and data analysis, Statgraphics Centurion software programme was used. The three most important operating variables: initial wastewater pH (x 1), current density (x 2) and operating time (x 3) were optimized for tannery wastewater.
biochemical wastewater treatment for a local tannery. The water samples were taken from outline areas (the wastewater of the chrome and vegetable tannery) in equal volumes and subjected to sedimentation, biological treatment, chemical and natural sedimentation treatment. The BoxWilson method of experimental design was
performed for treatment of tannery wastewater by various oxidation processes. A search of the ISI web of knowledge shows a number of research articles on oxidation and combined process on treatment of tannery wastewater. Fig s 2 and 3 shows the yearly progress of publications and citations in the late twentieth century and during the present ...
The contamination of wastewater and soil with toxic heavy metal ions is a complex problem. The removal of this contamination has received much attention in recent years. From an environmental protection point of view, heavy metal ions should be removed at the source in order to avoid pollution of natural waters and subsequent metal accumulation ...
Removal of chromium in wastewater 439 Figure 1. After having the highest record of the growth rate of microalgae were inoculated into the tannery wastewater, with the results provided by the accredited laboratory and applying the software for factor analysis and design of the 2FI model; in factor.
This paper describes the findings of an experimental investigation carried out on a pilot scale membrane bioreactor (MBR) with the addition of powdered activated carbon (PAC) to analyze improvements in effluent quality and in the filtration process. The results refer to a pilot plant monitorin ... Tannery wastewater treatment (1) ...
Most discrete leather particles and hair are easily removed by simple sedimentation, but proteins, metals and lime can only be precipitated by chemical flocculation. Some of the various coagulants referenced in the literature and the removal efficiencies attained with tannery wastewater are .
Waste water discharged from tannery has different character (pH) at different stages of the tanning process. The chrome liquor (discharged during chrome tanning process) has pH of about to while the lime liquor (discharged during lime tanning process) has pH of about 11 to 13.
An upflow anaerobic fixed biofilm reactor (UAFBR), which retains a high concentration of accumulated biomass in the form of biofilm supported by a carrier, has been developed to treat tannery wastewater. The effects of major process variables such as hydraulic retention time (HRT), organic loading rate (OLR), temperature on chemical oxygen demand (COD) removal, and methane yield performances ...
Tannery wastewater contains organic and inorganic complex constituents and exhibit high color concentrations which are not typically reduced through conventional treatment technologies. The objective of this research is to study the possibilities of using a lowcost activated carbon for the elimination of dyes from tannery waste water.
The damage to the environment by the hazardous tannery effluent is becoming an acute problem in the country. The chrome tanning process results in toxic metals, especially chromium passing to wastewater and are not easily eliminated by ordinary treatment process.
The removal of chromate ions in trace concentration from tannery wastewater effluent using Ion exchange technique was carried out by varying parameters such as Chromate concentration and contact time. A maximum of 99% removal efficiency in the batch Ion exchange process was achieved over an equilibrium contact time of 20min. The equilibrium uptake of chromate was constant at average .
for which the removal efficiencyreached to % of Chromium ions at room temperature, at adsorbent dose of and contact time 120 minute. The optimum pH for the removal wasfound to be at, cactus powder can be used effectively as an adsorbent for pretreatment for tannery wastewater. REFERENCES 1.
investigationcould fulfil the purpose of chromium removal from tannery wastewater using a lowcost adsorbent prepared from watermelon rind which is generally discarded as waste. 2. Experimental Sample collection Chrome containing wastewater was collected from the SAF Leather Limited, Khulna, chrome
Treatment of tannery wastewater using Upflow Anaerobic Sludge Blanket (UASB) system. Proceedings of the 31st Leather Research Industry GetTogether, (LRIGT`97), Central Leather Research Institute, Adyar, India, pp: 5757.
Apr 29, 2008· Tannery saline wastewater, a primary effluent stream in leather processing industry is generated by soaking the saltladen hides and skins in fresh water to remove excess salt. The presence of high salinity (1–10% NaCl by wt) in this waste stream hinders treatment by biological means .
Bacillus cereus was used to remove chromium (Cr(VI)) from medium containing tannery wastewater under different conditions. The maximum rate of Cr(VI) removal was attained at a temperature of 37 °C, pH of, and biomass of 20 g/L when the initial Cr(VI) concentration was less than 50 mg/L.
Present study dealt the removal of Cr(VI) in a tannery industry wastewater using rice husk silica powder as an experimental investigations have been carried out by using rice husk silica powder for different adsorption dosage, different contact time and different pH against the initial Cr(VI) concentration of 292 mg/L.