The rubber auxiliary wastewater is the most difficult part in the production of rubber additives. The wastewater usually contains a large amount of inorganic salts and organic sulfur, and has a high chemical oxygen demand (COD) and is difficult to handle. For example, although the rubber vulcanization accelerator NS is structurally non-toxic and harmless, the conventional sodium hypochlorite oxidation process produces 1 ton of NS, which will produce 4-5 tons of high-salt and high organic-contaminated wastewater, which is difficult to biochemically treat. The difficulty in the treatment of rubber auxiliary wastewater is:
(1) High in salt content. The production of the main rubber auxiliaries, especially the most used sulfenamides, thiazoles, thiurams, carbamates and other additives, have acid-base regulation or oxidation reaction steps, in this process A large amount of salts such as sodium chloride or sodium sulfate will be produced, and some products may have a salt concentration of 7% or more.
(2) The concentration is large. In order to increase the product output per unit time and reduce the amount of wastewater, manufacturers often achieve the above objectives by increasing the reaction concentration. The concentration of COD in the mother liquor thus formed is very high, and the COD of the mother liquor produced by some products can reach tens of thousands. Mg/L, if not pretreated, can cause severe impact on microorganisms in existing biochemical pools.
(3) There are many pollution factors and large changes. A variety of rubber auxiliaries commonly used in the formulation of rubber products, including accelerators, vulcanizing agents, anti-aging agents, coupling agents and other processing auxiliaries, except for a few auxiliaries, the annual demand can reach 10,000 In addition to the tonnage, the annual usage of most products is below 3,000 tons, and many products are used below 1000 tons per year. This demand characteristic has caused all the auxiliary production plants to take only a variety of roads. The variety of product patterns has resulted in the use of many kinds of raw and auxiliary materials, many types of reactions, and many types of by-products. This has formed a variety of pollutants in the wastewater of auxiliary enterprises. Due to the changes in market demand in different time periods, the relative proportion of production products also changes frequently, resulting in a drastic change in the pollution factors in wastewater, which makes it difficult to design and control wastewater treatment technologies and daily operations.
Promoter production General wastewater has complex composition, high chroma, high COD content, high salt content, difficult biochemical degradation, and is not suitable for biochemical treatment. At present, our company adopts two-stage micro-electrolysis + two-stage Fenton as the main materialization process, and has already run a number of companies, and its treatment effect is stable and good. The process has significant effects on COD removal and aniline removal.
Microelectrolysis filler rubber wastewater treatment principle:
(1) reducing hexavalent chromium to trivalent chromium;
(2) reducing mercury ions to elemental mercury;
(3) reducing the nitro group to an amino group;
(4) Oxidation-reduction of the colored group or the chromophore of the azo wastewater; to achieve degradation and decolorization
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