cyanide Articles
-
Bioavailability of cyanide and metal–cyanide mixtures to aquatic life
Cyanide can be toxic to aquatic organisms, and the U.S. Environmental Protection Agency has developed ambient water‐quality criteria for to protect aquatic life. Recent work suggests that considering free, rather than total, cyanide provides a more accurate measure of the biological effects of cyanides and provides a basis for water‐quality criteria. Aquatic organisms are sensitive to free ...
-
Use of ozone in the treatment of cyanide containing effluents
The treatment of effluents of the gold and silver cyanidation process is one of the main problems that the precious metals industry faces. These effluents contain variable quantities of free cyanide, weak complexed cyanide, strong complexed cyanide and thiocyanate. Different methods are used for the removal of cyanide but most of the times the consumption of reagents raises the operation cost to ...
-
Modem sustainable cyanide destruction control
Industrial Process Description Cyanide-containing waste is produced in various industries such as mining and electroplating. Processes such as stripping, cleaning, and plating generate wastes that can include metal cyanide complexes with alkaline iron, nickel, zinc, cadmium, copper, silver, and gold. Wastes containing cyanide are required by both US EPA law 40 CFR pan 413 & 433." and Ontario. ...
-
Removal of cyanide from liquid wastes by modified clinoptilolite
This paper describes the preparation and evaluation of various cationic forms of clinoptilolite for removal of cyanide from aqueous solutions. The cobalt form of the zeolite showed the highest uptake of 1.95 meq of cyanide per gram of zeolite, whereas the uptake of natural forms is 0.070 meq g-1. The kinetics of cyanide desorption into solutions with different ionic strength were studied. ...
-
Measurement of cyanide in urban snowmelt and runoff
Ferrocyanide compounds enter the environment as anti-caking additives to road salts. In illuminated aquatic environments, the salts dissociate and form toxic free cyanide, which can then be lost through volatilization. The most common techniques for analysis of cyanide in environmental samples measure total and free (generally weak-acid dissociable, WAD) cyanide species. Cyanide has been detected ...
-
Photocatalytic removal of cyanide with illuminated TiO2
Effects of TiO2 dosage, pH and initial cyanide concentration on the removal efficiency of cyanide from aqueous solutions with illuminated TiO2 have been investigated. Adsorption and oxidation were recognized as significant processes for the elimination of cyanide. From the Langmuir isotherm, the maximum adsorption capacity was determined as 17.24 mg/g at pH 7. Adsorbed amount of cyanide slightly ...
-
Natural cyanide degradation and impact on Ili River drainage areas from a Goldmine in Xinjiang autonomous region, China
The Ili River is a very important river to the northwest of China and Kazakhstan. The Axi Goldmine is located in the upstream of a branch of the Ili River. The cyanide from the goldmine effluent is a threat to the downstream areas. According to our study, the natural degradation of cyanide conforms to a negative exponential equation in the tailings impoundment, second wastewater pond and even in ...
-
Limitations of the removal of cyanide from coking wastewater by ozonation and by the hydrogen peroxide-ozone process
The purpose of this study is to compare the efficiency of ozonation and the hydrogen peroxide–ozone process for the removal of cyanide from coking wastewater. The most efficient oxidation process is combined with coagulation–flocculation–decantation and lime–soda ash softening pretreatments. The oxidation in aqueous solution and industrial wastewater (at pH 9.5–12.3) by O3 was carried out ...
-
Optimization of cyanide extraction from wastewater using emulsion liquid membrane system by response surface methodology
To solve the disposal problem of cyanide wastewater, removal of cyanide from wastewater using a water-in-oil emulsion type of emulsion liquid membrane (ELM) was studied in this work. Specifically, the effects of surfactant Span-80, carrier trioctylamine (TOA), stripping agent NaOH solution and the emulsion-to-external-phase-volume ratio on removal of cyanide were investigated. Removal of ...
-
Synthesis of Na-Pc zeolite from perlite and study of its ability to remove cyanide from liquid wastes
With the aim of the economic upgrading of natural resources, this investigation examined the hydrothermal synthesis of zeolite from perlite, and the ability of the synthetic zeolite to adsorb and retain cyanide. The hydrothermal treatment of perlite with aqueous sodium hydroxide results in the formation of Na-Pc zeolite. The cation-exchange capacity of zeolite for zinc, copper and silver was ...
-
Surface Decontamination of Cyanide Compounds (Potassium Ferricyanide (K3[Fe(CN)6])) by DeconGel 1101
ABSTRACT Surface decontamination efficacy determination of DeconGelTM 1101 on stainless steel, carbon steel, and concrete surfaces contaminated with a cyanide compound (potassium ferricyanide) was performed with ICP-OES (Inductively Coupled Plasma-Optical Emission Spectroscopy) according to Environmental Protection Agency (EPA) SW-846 Methods: 3005A (sampling) and 6010C (analysis). HAZARDOUS ...
-
Rugged pH and cyanide ion selective mining sensors for gold leach applications - Case Study
Cyanide Sensor has been engineered for gold mining to optimized stability and lifetime Custom pH sensor with solid state triple junction reference system and thick wall rugged pH glass element can withstand continuous use in agitated slurries Unique Dual Channel pH/CN- Analyzer and automatically output total (pH compensated) cyanide using only a pH and cyanide ion selective sensor The ...
-
Acute effects of road salts and associated cyanide compounds on the early life stages of the Unionid mussel Villosa iris
The toxicity of cyanide to the early life stages of freshwater mussels (order Unionida) has remained unexplored. Cyanide is known to be acutely toxic to other aquatic organisms. Cyanide‐containing compounds, such as sodium ferrocyanide and ferric ferrocyanide, are commonly added to road deicing salts as anticaking agents. The purpose of the present study was to assess the acute toxicity of three ...
-
Simple and sensitive detection of cyanide using pinhole shell-isolated nanoparticleenhanced Raman spectroscopy
Cyanide is a great threat to public health, environmental safety and homeland security because of its extremely high toxicity and widespread usage in industry. Countering such a threat can be greatly aided by a rapid, sensitive, on-site detection method. Here, a pinhole shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) technique for cyanide sensing has been established, and a ...
By B&W Tek
-
Treatment of cyanide wastewater by bulk liquid membrane using tricaprylamine as a carrier
The transport of cyanide from wastewater through a bulk liquid membrane (BLM) containing tricaprylamine (TOA) as a carrier was studied. The effect of cyanide concentration in the feed solution, TOA concentration in the organic phase, the stirring speed, NaOH concentration in the stripping solution and temperature on cyanide transport was determined through BLM. Mass transfer of cyanide ...
-
Operating conditions for the continuous bioremediation of free cyanide contaminated wastewater using
Aspergillus awamori Generation of cyanide-containing wastewater is a growing problem worldwide as numerous cyanide complexes are highly unstable and degrade to form free cyanide (F-CN), the most toxic form of cyanide. Agro-waste materials, such as sweet orange (Citrus sinensis) waste from the citrus industry, are rich in readily metabolisable carbohydrates that can supplement microbial activity and thus support ...
-
CH#824 - Steel Production - Activated Sludge
BackgroundThe treatment plant at this Steel Mill treats approximately 0.3mgd waste from the coke and steel operations. Over the past year the treatment works improved performance and consistently produced a good quality effluent with respect to phenol, suspended solids, ammonia and cyanide. An improvement in performance was required to meet future discharge limits. To achieve this level of ...
-
Characterization of a supported ionic liquid membrane used for the removal of cyanide from wastewater
This work evaluated the performance of ionic liquids (ILs) in supported liquid membranes in the removal of total cyanide from wastewater. Membranes were characterized by scanning electron microscopy and contact angle measurements to study the membrane morphology and wetting ability. In particular, the effects of operational parameters such as membrane immersion time, feed-phase concentration, ...
-
Biodegradability of substances discharged to the aquatic environment
The term "biodegradability" is much used today, when most people, due to media exposure, are aware of the "environment" and "pollution". To say that a product or substance is "biodegradable" infers to the layman that it is ecologically "safe". Certainly it is safer than substances that contain persistent toxins (e.g. some pesticides, chlorinated hydrocarbons, tributyl tin, heavy metals etc). ...
-
Synthesis of β-Cyano ketones promoted by a Heterogeneous Fluoride catalyst
Keywords: β-cyano ketones;heterogeneous catalysis;solvent-free conditions;sustainable chemistry;A simple protocol for the conjugate addition of cyanide group to α,β-unsaturated ketones has been developed. By exploiting solvent-free conditions, the use of Amberlist-F (Amb-F) as heterogeneous fluoride catalyst, and trimethylsilyl cyanide (TMSCN) as reactant, β-cyano ketones ...
By SusChem
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you