waste water treatment chemicals

Chemicals to treat wastewater

Water participates in the industry in many different ways and in most cases essential in the production system. In the different industrial sectors are given many wet processes, which implies higher consumption of that item. Some of the water supply is drawn from their own (wells) or the network of drinking water evaporates during the process and is lost, another percentage is in the product being manufactured, but a large percentage is generated as waste water. Should be considered on the other hand semi water systems involving substantial flows. At this point we include the cooling of equipment and processes.

Classification of sub-sector industrial wastewater

The water resulting from all processes can be summarized in the following types: Industrial wastewater, as a result of the various stages of manufacture. Wastewater treated as urban health are the consequence of the population of workers involved in the processes. Water cooling circuits that are responsible for heat exchange equipment (presses, motors, cogeneration, ..) and coolant (water). Process waters. The characteristics of each of these types of waters are very different from each other, resulting in very different and specific problems. Production systems, points that originate wastewater Industrial wastewater and process Come from the production line cleaning, containers and reservoirs as well as cleaning of the machinery employed in various industrial process (milling drums, tanks agitation, reactors, etc. ...).

Industrial Wastewater Treatment

Treatment systems, wastewater can be classified according to the traditional classification: Physico-chemical or primary: Roughing, coagulation, flocculation, sedimentation, flotation, etc. .. Biological or secondary treatment: biological fixed bed (percolaladores filters, rotating biological discs, ..) and mobile biological bed (conventional activated sludge, SBR, Membrane bioreactors ...). Tertiary treatments: Ion Exchange, treatment of membranes (reverse osmosis, microfiltration, ..), chemical oxidation, ultraviolet light treatments, treatments of ozonation, filtration bed, etc. ... Chemical processes in the wastewater treatment Decantation achieves efficient removal of pollutants from wastewater. Decantation is carried out in purification plants through application of chemical reagents and subsequent decantation under gravity or by flotation. This provides purified water for later use or disposal. The manufacture of these chemicals meet current legislation.

The general process for the chemical treatment of wastewater comprises:

PH adjustment Coagulation Flocculation Then we will see each process separately. Chemicals for pH adjustment The adjustment of pH is a very important physical-chemical treatment. The pH must be found in certain values ??for the process is optimal because: Favors the action of the coagulant-flocculant. It allows the precipitation of dissolved metals as hydroxides. The optimum value, and depending on the coagulant used, should be between 6 and 8. A direct relationship between the pH values ??compared to the solubility of the metal hydroxides. So that the working pH should be selected depending on the presence of such metals. In general forms, at pH values ??between 7.5 to 8.5 such removal occurs by precipitation from water. Exceeding the maximum value of 8.5 may occur redissolution of the precipitated components.

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