| Saponin wastewater has plenty of sugar and a few pigment, gum, albumen and so on, which include large molecules and difficult to be biodegradated, so saponin wastewater is a kind organic wastewater of high concentration and acidity. Because of confinement of producers scale, finance,technique, up to date, the mature and economical technology of treating saponin wastewater hasn't occurred. And the problem of saponin wastewater pollution has become a bottleneck problem on developing saponin industry healthfully. This study was based on current situation of enterprises producing saponin wastewater and the principle of transforming wastewater into resource and achieving standard emission. It combined technology of fermentation and wastewater treatment to treat saponin wastewater in order to seek a simple,high efficient,low energy-cost technological way that could be easily accepted by saponin enterprises. At the same time it could gain the aim of producing resource and solving the environmental pollution. The subject of this thesis was comprehensive resolution of saponin wastewater released during the process of producing saponin and the research indication was saponin wastewater,s COD removal rate, saponin wastewate,s color removal rate,the cost and benefits of treatment. Through the use of SCP(Single-Cell-Protein) microbes-chemical oxidize flocculation dual level treatment, in this experiment, I respectively studied the primary treatment of diversified microbes and the conditions, factors, cost and profit caused by diversified chemical oxidize flocculation during the process of producing saponin wastewater. After contrasting the cost to the profit, I achieved the dual level treatment SCP microbes-chemical oxidize flocculation which has lower costs but higher profits. The following results were obtained:Firstly, the technological conditions of treatement of saponin manufacturing wastewater by utilis were studied through orthogonal optimizing experiments and single factor experiments, the optimized technological condition was obtained: when temperature 30℃, inoculation 10%, treattime 3d, VVM=1∶1.5,the start pH of wastewater is 5.5, carbamide and KH2PO4 added into the wastewater according to m(CODCr)∶m(N)∶m(P)=50∶5∶1, the saponin wastewater's CODCr remoral rate reached 89.56%, and dry cell weight is 24.9 g/L in the treatment wstewater.Secondly, the technological conditions of treatement of saponin manufacturing wastewater by white rot fungus were studied through orthogonal optimizing experiments and single factor experiments, the optimized technological condition was obtained: when temperature 30℃, VVM=1∶0.5,inoculation 150 mL/L, treattime 4d, the start pH of wastewater is 4.5, carbamide and KH2PO4 added into the wastewater according to m(CODCr)∶m(N)∶m(P)=100∶5∶1, cellulose added into the wastewater according to m(CODCr)∶m(cellulose)=1∶0.01 mg.mg-1, and MgSO4 added into the wastewater according to 0.05 g/L, the saponin wastewater's CODCr remoral rate reached 95.02%, the color removal rate is 20%, and dry cell weight is 29.9 g/L in the treatment wstewater.Thirdly, through analyzing the two primary level technology of disposal on saponin wastewater by SCP microbes, the first optimized technology is white rot fungus treatment technology, because it has the highest profits, and wastewater's COD removal and color removal rate are higher. The second optimized technology is utilis treatment technology, because of it,s lower costs and small investment.Forthly, by contrasting the two second level chemical oxidizer flocculation technological of disposal on saponin wastewater by flocculation, the optimized technology is polymerized iron chemical oxidizer flocculation technology, because it can effectively remove COD and color of different treatment saponin wastewater by SCP microbes, at the same time, its costs is lower. The technological conditions of treatement of saponin manufacturing wastewater by polymerized iron chemical oxidizer flocculation were studied through orthogonal simple factor experiments, the optimized technological condition was obtained: when temperature 30℃, treattime 30min, static place 30min,the polymerized iron added into the after treatment wastewater by utilis according to 4.5 g/L, the polymerized iron added into the after treatment wastewater by white rot fungus according to 1.75 g/L, the COD, color and pH of different emission of wastewater by polymerized iron reach the first or second standard of GB18918-2002.Fifthly, by contrasting the two technological of disposal on saponin wastewater by SCP microbes-polymerized iron chemical oxidizer flocculation dual level treatment technology, the first optimized technology is effective utilis-polymerized iron chemical oxidizer flocculation treatment technology because of its lower costs and small investment. The second optimized technology is white rot fungus-polymerized iron chemical oxidizer flocculation treatment technology because of it's best benefits.Sixthly, except the cost of equipment, the salary of worker and the cost of management, when handling saponin wastewater per ton, it is treated by utilis-polymerized iron chemical oxidizer flocculation treatment technology, the treatment cost of per ton saponin waste water is 39.50 yuan, it's profit is -2.15 yuan. The wastewater's COD removal rate can reach 99.25 % and the color removal rate is 96.68 %. When saponin wastewater was treated by white rot fungus-polymerized iron chemical oxidizer flocculation treatment technology, its cost is 40.6 Yuan, its profit is 4.25 Yuan, the COD removal rate of wastewater can reach 99.7 %,the color removal rate is 96.9 %.In this study SCP microbes-polymerized iron chemical oxidizer flocculation second level treatment technology is applied to treating saponin wastewater at the first time. The technology can remove carbon and decolorize remarkably, at the same time it can make the COD, color and pH of different emission of wastewater reach the first or second standard of GB18918-2002. Moreover, the technology can translate the pollutant into the resource, and produce the economic and social benefits. This study proves a new method and idea to treat saponin wastewater and it will definitely have a certain value to extend and apply.
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