Pigment Green 18 can be toxic to fish and shrimp in water, and can cause teratogenic, carcinogenic, and mutagenic effects on mammals and humans through the food chain, and promote tumor growth. Therefore, this substance is widely used in terrestrial and aquatic ecology. Bioaccumulation in systems has implications for both the environment and human health. Therefore, the treatment of Pigment Green 18 wastewater has become a top priority. A method for degrading Pigment Green 18 wastewater, the method comprises the following steps:
(1) Settling the malachite green wastewater grid;
(2) Heat the Pigment Green 18 wastewater treated in step 1 to 15°C, adjust the pH to 4, and filter after 1 hour; Fe2+, Fe3+, Ca2+, etc. in the wastewater form precipitates, which are filtered out, and the filtrate obtained by filtration is subjected to the next step;
(3) The filtrate treated symphonious 2 is used as the electrolyte, the titanium electrode is used as the reduction electrode, the saturated calomel electrode is used as the recommendation electrode, and also the platinum electrode is used as the functioning electrode; and also the reduction voltage is -0.9 V under the problem of minimizing 5 hrs, the malachite eco-friendly wastewater undertakes an electrochemical reduction response, resulting in leuco-Pigment Green 18 precipitation. Filtering system the lowered electrolyte to obtain leuco-malachite green crystals;
( 4) The filteringed system wastewater is electrochemically oxidized again. The oxidation electrode utilized is BDD electrode, the saturated calomel electrode is utilized as the reference electrode, and also the platinum electrode is utilized as the functioning electrode; under the condition of oxidation voltage of 1.0 V, 5 hrs, to make sure that the rest of the organic matter is oxidized.
The leuco-malachite green crystals were obtained after the degradation in this instance, the yield was 60%, and also the COD in the water after electrochemical oxidation treatment was 50 mg/L.