74 results about "Residual phosphorus" patented technology

The present invention relates to a simple, and economical process for the preparation of rice bran oil low in phosphorous content (<10 ppm) by treatment of crude rice bran oil to substantially remove the phosphoglycolipids responsible for the residual phosphorus in degummed rice bran oil, said process comprising:a) treating the crude rice bran oil at ambient temperature with 5% of boiling water and separating the sludge formed to obtain a clarified oil,b) treating the clarified oil thus obtained with 0.5% to 10% of a reagent selected from the group consisting of mono-, di- or triethanolamine to obtain said low phosphorous content oil.

The present invention relates to a simple and economically attractive process for the pretreatment of vegetable oils which involves (a) enzymatic degumming with commercially available phospholipase A1 from the sources like Aspergillus oryzae microorganism, (b) bleaching of the enzymatically degummed oil using bleaching earth and activated carbon, and (c) dewaxing (in case of rice bran oil) of degummed and bleached oil at lower temperature to obtain oil with less than 5 ppm of residual phosphorus which is amenable for physical refining.

The invention relates to a preparation method of phosphate rock powder or crushed phosphate rock binder and a molded ore production method, belonging to the technical field of comprehensive utilization of mineral resources. Using industrial by-products mainly containing silicon oxide as raw materials, adding caustic soda and catalysts to prepare phosphate rock powder or crushed phosphate rock binder; pelleting the binder with phosphate rock powder or crushed phosphate rock discs, and calcining it is an electric furnace The raw material for the production of French yellow phosphorus is ore. The method has the advantages of simple production process, mature equipment, low investment, convenient operation, high strength of molded ore, tail gas without any impurity removal treatment can be used as heat source, low cost, and at the same time can increase the reduction rate of phosphorus and reduce the residual phosphorus content in the slag , especially suitable for the characteristics of the future electric furnace yellow phosphorus production with washed ore as raw material.

The invention discloses an autotrophic nitrogen removal method for biological phosphorus removal of urban sewage based on short-cut denitrification for providing nitrite. The method comprises the following steps: firstly feeding urban sewage into an anaerobic zone of a biological phosphorus removal nitrogen removal reactor, wherein short-cut denitrification is firstly carried out on denitrifying bacteria on a biological membrane so as to reduce nitrate nitrogen in return sludge to nitrite nitrogen, anaerobic ammonium oxidation bacteria on the biological membrane further convert nitrite nitrogen and nitrite nitrogen into nitrogen while anaerobic phosphorus release is carried out on phosphorus-accumulating bacteria in floc sludge; then feeding the sewage into the anaerobic zone again, wherein short-cut denitrification is carried out on the denitrifying bacteria on the biological membrane so as to reduce nitrate nitrogen in return sludge to nitrite nitrogen, and anaerobic ammonium oxidation bacteria on the biological membrane further convert nitrite nitrogen and nitrite nitrogen into nitrogen; then feeding the sewage into an aerobic zone and ammonia oxidizing bacteria and nitrite oxidizing bacteria in the floc sludge oxidize residual ammonia nitrogen in the sludge to nitrate nitrogen; and finally, implementing residual phosphorus removal and autotrophic nitrogen removal of urban sewage of a continuous flow, wherein the treatment energy consumption of an urban sewage plant is reduced.