Hubei Hongyuan Pharmaceutical Technology Co., Ltd.

The running conditions of deep defluorination by hydrothermal crystallization in the fluoride-containing wastewater treatment engineering of a photoelec. enterprise glass thinning is introduced,as well as,the effect of defluorination and economic indexes are analyzed.The results show that the fluorine content of effluent can be controlled below 6 mg/L,and the cost of treatment is 13.32 yuan per ton.The quality of effluent can remain steadily and meet the first grade requirement of China's national integrated wastewater discharge standards,showing a prospect of promotion.

Formation of sediment is a crucial problem to be confronted with during storage of tea beverages.A great deal of research has been done by enterprises and institutions of tea drinks at home and abroad, with the result of precipitation mechanisms being illuminated basically and methods to inhibit sediment being developed.However they did not work well in dealing with issue arising from flavoring tea beverages produced by tea-leaf extracts because they were usually employed to manage problems of drinks used tea-leaf as raw material directly.Addnl., it would get to be worse if some other plant extracts were adopted in tea beverages.And the development of flavoring tea beverages towards to diversification will be hindered by precipitation issue.From point of this view, authors aimed to demonstrate precipitation mechanisms and discuss the feasibility of employing current methods to treat with problems of sediment in flavoring tea drinks.

At present, the development of China′s photovoltaic industry has accelerated, but a large amount of fluorine-containing wastewater has been produced.In order to accurately determine the soluble silicon content in fluorine-containing wastewater of photovoltaic industry, this paper mainly uses silicon molybdenum yellow spectrophotometry to conduct exptl. research.The method of detection and anal. of soluble silicon content in fluorine-containing wastewater before and after defluorination treatment was established by establishing silico-molybdenum yellow method, and interference tests were carried out on interfering ions such as Al³⁺, F^- and P in water samples.The test results show that the presence of low concentration of Al³⁺ and F^- plasma in the water sample has no interference on the determination of soluble silicon content, and the interference of P element is more serious, while oxalic acid can mask the interference of phosphorus, and 1 mg of phosphoric acid corresponds to 0.6 mL 10 g/L oxalic acid solution has the best interference effect; c (Si) has good linearity at 0∼2.0 mg·L^-1, R²>0.999; the precision test results show that the spiked recovery of the sample is 100%±3.00%, When c (Si) was 34.475 mg·L^-1 and 3.332 mg·L^-1, the relative standard deviations were <3%.Therefore, the determination of soluble silicon in the fluorine-containing wastewater of the photovoltaic industry can be carried out by using the molybdenum-lime yellow spectrophotometry.