Inventory of the Chemicals and Microenvironment of an Albanian Tannery . Gentiana Shegani . Directorate of Public Health . Albanian University . ... reduce bad odors as well as the concentration of airborne pollutants released during the production ... received and Sodium …
containing sodium chloride at concentrations above 2.5 g/liter has been reported to produce hypertension (Fadeeva VK., 1971), this effect is believed to be related to the sodium ion concentration. 1.4 Effect of Chlorides 1.4.1 Human Health: A normal adult human body contains approximately 81.7 g …
The high EC and TDS in groundwater were observed near the tannery region due to influence of tannery effluents. The concentration of sodium increases in the groundwater which is due to geochemical processes of silicate weathering and anthropogenic activities (Sarin et al., 1989; Rajmohan and Elango 2004; Halim et al., 2009). Sodium is the most ...
The hydrogen sulfide liberated from the wastewater is carried by air stream to an absorption tower where is is absorbed in recirculating caustic soda until a desired sodium sulfide concentration is achieved. The sodium sulfide is then reused in the tannery's unhairing process. Quantitative removal and recovery of the sulfides is accomplished.
the efficiency of biological treatment of tannery effluents. High levels of TDS and sodium chloride are typically present in tannery effluent. The TDS concentration can reach 7,000 mg/l and in some cases more than 15,000 mg/l. The less water is used for leather production, the higher the TDS concentration.
effect of sodium chloride on specific gravity of black cotton soil. It was observed, that the values of specific gravity is decreasing with the increase in concentration of sodium chloride. The IS code specifies the procedure to obtain the specific gravity of untreated soil.
sodium carbonate also indicate that the concentration of chromium in leather shaving was higher than that in its counterpart. The percentage recovery of chromium from both samples was determined with considerations given to parameters to examine the effect of acid concentration, and contact time. In most cases, the percentage recovery of chromium
The subjects of interest in this work were the production of biogas via anaerobic co-digestion of tannery fleshing and cow-dung; and the reduction of sulphide concentration by direct inclusion of sodium …
Reduce concentration of chromium in the effluent The objectives of this study to correlate chemical properties of polluted water discharged from tannery, viz., pH, chloride, sulfide, BOD 5, COD, alkalinity, acidity, T.S.S, TDS and assessment of tannery wastewater in …
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There was a considerable and gradual reduction in the absorbance values and Cr concentration every hour. The concentration of total Chromium in the effluent was reduced to 30 mg/l from 630 mg/l after 192 h of treatment with B. subtilis (B) which showed 95.2% efficiency in remediation of chromium. P. aeruginosa (P) removed Cr with 91.2% efficiency.
level is 0.05 mg/l so concentration should be low as possible. The concentration of chromium in different processing operational part of the tannery effluent ranging from 0.01 to 2750 mg/l. Maximum and minimum concentration are for chrome tanning and soaking and operation. Chrome tanning operational effluents
Caustic Scrubber Designs for H 2S Removal from Refinery Gas Streams . 1 Abstract . Caustic scrubbing is a technology that has been used for the removal of H 2S and other acid species from gases in different industries for many years.
tannery process is one the most important sources of environmental pollutants as the concentration of chromium and other harmful material in the wastewater is extremely high. This is also confirmed by many other studies [11,12]. The optimum pH for removing chromium from the tannery wastewater by sodium hydroxide and calcium
3.2. Effect of Tannery Effluent on Microorganisms. Growth of all the tested microorganism (Bacillus thuringiensis, Rhizobium etli, and Aspergillus terreus) were inhibited by TE.The inhibition of growth was observed in bacteria and fungi at a concentration of 30%. IN VITRO TECHNIQUE FOR SELECTING ONION FOR WHITE
Preparation of sulphide-lime unhairing tannery process was carried out using nine ratios coded as A I – A III ; B I - B III and C I – C III with varied concentrations of sodium sulphide and hydrated lime. Result obtained through subjective tests and gravimetric method show differences in degree of unhairing, swelling and plumping of the pelts.
Enhanced Chromium Recovery from Tannery Waste by Acid-alkali Reaction in China Huai LI1,a, Jianzheng LI1,b, ... In order to develop an economic treatment for tannery waste, a mixed alkali of sodium hydroxide and magnesium oxide and diluted mineral acids were tested to improve ... Concentration of chromium in the wastewater was about 108.8 mg/L ...
concentration of 27.6 mg/l, and 40-70% removal of total chromium from settled tannery wastewaters, at an initial concentration of 811.4 mg/1 and 223.7 mg/1 respectively. Other heavy metals were removed by the primary treatment (90% removal of total lead and 98% of total mercury at an initial concentration of 754 µg/l and 716 µg/l respectively).
different ways. This paper describes a study conducted to determine the recovery of chromium from tannery wastewater by reverse osmosis. The effluent is first subjected to the gravity settling, followed by alum treatment. The supernatant is then treated with the subsequent reverse osmosis after a coarse filtration by a fine cloth.
Aqueous two-phase system (ATPS) composed of polyethylene glycol 6000 (PEG 6000) and sodium citrate (SC) has been proposed to recover the valuable soluble proteins from tannery wastewater. A sequential optimization strategy which included fractional factorial design (fFD) and central composite design (CCD) was employed to enhance the recovery.
When compared with normal adult values, urinary chromium concentration, Cr/Creatinine ratio, daily chromium excretion, and hair chromium, concentrations were significantly higher and urinary beta 2-microglobulin/Cre ratios significantly lower in both tannery workers and in controls.
effluent of Addis Ababa Tannery Share Company for selected parameters, (iii) to compare the efficiency of lime, sodium hydroxide and magnesium oxide in the precipitation process for the removal of chromium from tannery effluent, and (iv) to recover basic chromium sulfate or chromium from chromium hydroxide sludge for reuse.
SALINITY REDUCTION IN TANNERY EFFLUENT Catherine A. Money and N. K. Chandra Babu CSIRO Leather Research Centre, Clayton 3168, Victoria, Australia Central Leather Research Institute Adyar, Chennai, Tamil Nadu 600020, India Introduction Salinity in tannery effluents, measured as TDS (Total Dissolved Solids), is a critical problem
ABSTRACT: 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.
crops decrease with increase of tannery effluent concentration (Sinha et al., 2015). The Tannery waste have a strong reddish- dull brown colour, High BOD, ... sodium sulphide in aqueous solution Manganese Oxide and mixtures of other transition metal oxide are found …
A rapid, simple and automatic method was proposed for online determination of tannic acid in colored tannery wastewater by automatic reference flow injection analysis. The proposed method is based on the fact that tannic acid can reduce phosphotungstic acid to form blue compound in alkaline solutions.
during buffing operation in the tannery, hence the result of This result indicates that there is an increase in which is reflected in this study. concentration of chromium with increase in concentration of sodium carbonate in both leather buffing and shaving wastes. 3.4.
Sodium hydroxide (caustic soda) is a co-product from the manufacture of chlorine using a solution of the readily available raw material, rock salt (sodium chloride). These factors contribute to it being the cheapest and most widely used strong alkali. Uses of sodium hydroxide . Figure 1 Uses of sodium hydroxide.
contained sodium sulphide, sodium chloride, lime, formic acid, sulphuric acid, sodium formate etc. like a typical tannery waste water. Addition of a base (NaOH or CaO) to the Cr III solutions (both synthetic and actual effluents) produced thick green precipitates of Cr(OH)3.
was a more efficient base catalyst than sodium methoxide for the transesterification of beef tallow. They obtained optimum yield of biodiesel at a 9% catalyst concentration. This research aimed to reveal the utilization of tannery fleshing as feedstock and sodium hydroxide as a catalyst. The pre-treatment of feedstock study using solid-state
The high concentration of sulphate are not surprising because sulphate in the tannery effluent were emanating from the use of sulphuric acid used for batting (i.e., used for making the leather soft and flexible) or products with a high sodium sulphate used for diliming (i.e., for making the leather non-alkaline) content.
Bioremediation of Tannery Wastewater by Chromium Resistant Fungal Isolate Fusarium chlamydosporium SPFS2-g SMILEY SHARMA1 1, 2and PIYUSH MALAVIYA * 1 Department of Environmental Sciences, University of Jammu, Jammu (J&K) India. 2 Laboratory of Environmental Pollution Analysis, Faculty of Biology, University of Warsaw, Warsaw. Poland.
2 3 Characterisation and recovery of sodium chloride from salt-laden solid waste generated from leather industry. ... highest concentration of diss olved ionic species in aqueous.