Research On Treatment Of Lutein Industrial Sewage, High Ammonia Nitrogen Wastewater And Low Concentration Phosphorus Solution

With the rapid economic development, the increasing of environmental pollution has posed a major global problem. A large mount of phosphorus sewage, high ammonia nitrogen (NH3-N) wastewater and industrial wastewater have been discharged into natural water resources, which made water pollution and environment pollution more serious, as well as serious influence on agriculture, stockbreeding and so on. Therefore, protection of water resources and techniques for wastewater purification is highly appealing. Herein, techniques for removing of phosphorus and NH3-N from polluted water were discussed. Treatment of wastewater from a lutein factory was also investigated systematically.In this paper, a calcined natural light phosphorus removing agent has been used to remove phosphorus from polluted water. The effects of agent amount, pH, reaction time and temperature on the adsorption capacity were investigated. The results show that a high adsorption capacity of3.26mg P/g (pH=6-9) could be achieved when the initial concentration is1.01mg P/L. The developed method is economical for practical application.A series of methods such as biological treatment, catalytic oxidation, adsorption and air stripping have been used to remove NH3-N from a waste water of high concentration ammonia in this work. And the removal rate was91.5%.Moreover, the development of lutein production has been restricted because it is difficult to purify the wastewater from marigold, which is used as raw material. Here, the lutein wastewater have been treated by biological method, flotation, microwave heating, ferrate treatment, active manganese dioxide (ACMD) treatment, frozen separation, photocatalytic oxidation and combination of photocatalysis with biological treatment. Clear results were obtained by microwave heating, frozen separation and combination of photocatalysis with biological treatment. The chemical oxygen demand (COD) could be reduced to218mg/L when photocatalytic oxidation was combined with biological treatment. The concentration of NH3-N and pH of the treated water was 25mg/L and8, respectively. Besides, fertilizer was produced as by-products.