| The hormone-based drugs industry is gaining ground due to the rapid grows of processing industry of turmeric saponin,which also promotes the farming of turmeric and speeds up poverty alleviation of the local farmers. However, a large number of waste residue and waste water which had high acidity level are produced during the process of saponin extracting. The wastes bring serious influences on the environment on which we depend, and cause certain pollution which impedes the sustained development of the turmeric industry. It’s very important to work out a method of resource regeneration of the waste produced during the process of saponin extracting.300 tons of waste water and 7-8 tons waste residue were produced while 1 ton of saponin was extracted by the cleaner production technology improved by Northwest A&F University. High acidity level of the waste water, high concentration of organisms and difficulty for degradation are the essential features of the wastes. The waste water and waste residue of turmeric saponin was studied in this paper. The priscription for preparing organic-inorganic fertilizer by wastewater and solid slag was studied. The waste water cannot be full converted into organic-inorganic fertilizer because the amount of the waste water was far more than the amount of the waste residue. So the optimum conditions for wastewater pre-treatment by the method of flocculation precipitation were also discussed.The wastewater was concentrated to different enrichments, and were used to prepare fertilizer with incineration ash of waste residue. A sticky pastelike substance which can’t be used to prepare fertilizer with incineration ash was formed when concentrate enrichment was 1/6 or 1/10. The concentrates can used to prepare fertilizer with incineration ash of waste residue when the concentrate enrichment was 1/2、1/3、1/4, but they were not up to the standard of fertilizer used in agriculture inland due to their potassium content which were 10.08%、14.03%、17.23%. So we had to use them to prepare mixed-fertilizer by adding chemical fertilizer. 1/4 was chose as the optimum enrichment because of higher potassium content The compositions of 10-10-10 was: 1t waste water concentrated to 0.25 t, 0.05 t KOH, 0.195 t incineration ash of waste residue, 0.146 t urea, 0.095t(NH4)H2PO3 and compositions of the mixed-fertilizer were adjusted according to the requirements of various crops.The waste water and residue were used as the main raw material. The organic fertilizers was prepared by the compositions of 9.75 L waste water, 0.42 kg KOH 0.13 kg urea, 6.5 kg waste residue, 0.3 kg K2HPO3 and the leavening agent. The organic fertilizers of which the contents of organic matter, N, P, and K were all up to the standard of organic fertilizers made by the Department of Agriculture(NY525-2012) were prepared by composting.The COD and dust suppression efficiency of the waste water influenced by p H(adjusted by adding quicklime), the amount of PAM and were studied when the p H of the waste water was less than 1 and COD of is 75160mg/L. The optimal results were obtained while the p H of wastewater was adjusted to 8.5. The COD dropped from 75160mg/L to 63255mg/L and the ratio of COD elimination was 15.83% and the optimum dust suppression time was 50 min. When the waste water was treated by PAM, the optimal results were obtained by adding 0.8 mg PAM per m L waste water. The COD dropped from 63255mg/L to 45423mg/L. The ratio of COD elimination was 28.19% and the optimum dust suppression time was 20 min. When the waste water was treated by chitosan, the optimal results were obtained by adding 1.0 mg chitosan per m L waste water. The COD dropped from 63255mg/L to 46688mg/L. The ratio of COD elimination was 26.19% and the optimum dust suppression time was 25 min. As a consequence of the above the PAM was the optimum flocculating agent while taking into account the efficiency of waste water treatment and economic cost. |
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