Such chemical substance can be ozone. But this is a very expensive method, especially for large volumes of dyeing wastewater.The choice of an economical and ecological method depends on various factors: the volume of wastewater, the concentration of contaminants, the pH, the permissible purification efficiency, and others.
sure. cyanide is toxic. but thats why its in the waste water. its washed away. and you can use microbes to break it down. our bioreactors make the microbes to breakdown cyanide and phenols and polyphenols. sure, handling of the waste water as it comes in has to be careful. but after the EQ tank where you can add mix things up with some treated waste water returns and going through an anoxic process, the cyanide is much reduced and much safer in the aerobic tanks. like what Richard said, biological process is the cheapest. our biotubes will continually produce these said microbes for 20 years to make it easy and cheap to breakdown. psuedomonas florescens is known to do that. and our tubes is the cheapest way to produce this microbe with no sludge to think about. its not scary any more to treat cyanide. we just made it very convenient.
According to my/our extensive experience in treating textile dyeing wastewater (incl. over 20 large textile ETP's in Bangladesh) the concentrations of both cyanides and phenol compounds would be sufficiently low after full equalization for their complete biological oxidation in (advanced) activated sludge plants.
Hence no need to add chemicals aside from pH neutralisation and nutrients for biological treatment.
With respect to both phenol and cyanide, it is best to keep both from entering the wastewater system. However, some will always get to the wastewater unit. Biological treatment is both possible and efficient depending upon concentration and biological unit capacity. The use of oxidants or chemical treatment should be considered an emergency response rather than a daily application. In one high CN wastewater system, I have seen constant adding of permanganate at the secondary clarifier to control potential CN releases - putting oxidants after biological treatment lowered the required dose.
Presence of either cyanide or phenol is highly dangerous, and in the presence of both, the effect is compounded. summarizes the available technologies for their treatment and emphasizes recent advances and advantages of biological abatement of these pollutants.
Cyanide and phenol are found extensively in the effluents of refinery, coke plant, electroplating industries and are extremely dangerous to environment. Commercial granular activated carbon can be used as an adsorbent for the simultaneous removal of cyanide and phenol.
Phenols and cyanides can be recovered/removed from wastewater streams using various physicochemical techniques practiced commercially. Lack of complete mineralization, cost-effectiveness, and release of secondary by-products are amongst a few of the major considerations that limit the installation of such processes. Biological removal of such pollutants from industrial waste has gained momentum in recent years, as they promise to surpass the major drawbacks laid by the physicochemical methods and can be practically carried out in all conditions.
The solar photo-catalytic system performance was tested in terms of the phenol removal and TOC mineralization efficiency by using FeSO4 as a catalyst and Oxalic acid as a solar photo assisted agent to enhance the process efficiency. Different operating conditions studied to investigate the performance of the photo-catalysis system, such as initial phenol concentration, initial H2O2 concentration, FeSO4/Oxalic weigh ratio, pH of solution, and solution flow rate. The operating variables optimized to obtain a maximum efficiency for the system performance.
Mr Sonbol. I suggest that you disregard these complicated high tech advanced oxidation responses. The chemistry is simple. Chlorine or ozone. Of course how you do in practice depends on how much cyanide and phenol you must treat. The drawback on chlorine is that it will produce trichlorophenol that has noticeable taste.
you can use advanced oxidation processes for degradation of phenols and cyanide, adsorption (activated carbon,....) assisted UV/H2O2 may be useful one under suitable pH, contact time , temp and adsorbent dosage.
Biological Treatment can treat phenols up to 200 mg/L concentration effectively. It will be helpful for cyanide treatment too. However for full removal you need biological + chemical or adsorption treatment.
dear Mo, there is a microbe set, Chem5, that will chew up cyanide and phenols and chromofores in dye water. it can be used to treat inks too. and its dirt cheap to use.
Biological treatment can usually provide the least expensive removal. Microbial products are available to start or recover the process. Concentration is an important parameter for any process selection as well as the other important characteristics of the particular wastewater.
Yes. I have read several responses here and feel that all can potentially remove cyanide and phenol. What you want is a disinfectant that not only removes the cyanide and phenol and still remains in the water as residual presence to disinfect the water from re-contamination, and the only disinfectant that can do this is chlorine dioxide.
There are several treatment options, but first you need to know the sort. In modern dyeing wastewater cyanide and phenol should not even be present. Standard biological treatment should remove the phenol. For cyanide, the concentration and regulatory limit are really important so we need that to advise. The type of dyeing is needed also (material, dye type, etc).
We specialize in turn-key offerings for just this type of treatment. Please visit www.usptechnologies.com, and then give me a call. I am the Industrial Business Development Manager, and I have 28 years of experience treating industrial wastewater all over the world. We can certainly help you with your challenge. Sean L. Roop USP Technologies, (239) 989-3581.