32results about How to "Short flocculation time" patented technology

The invention discloses a fiber radical sewage decoloration and purification material which is characterized by comprising a component (I) and a component (II). The component (II) occupies 5%-10% of the total mass. The component (1) is a product obtained by reaction of 36% formaldehyde solutions, dicyandiamide, ammonium chloride and property-modifying additives A, wherein the mass ratios of the 36% formaldehyde solutions, the dicyandiamide, the ammonium chloride and the property-modifying additives A are sequentially 1.0-1.3:0.50-0.65:0.60-0.70:0.06-0.09. The property-modifying additives A are a mixture obtained by mixing magnesium sulfate and magnesium chloride according to a proportion, wherein the mass ratio of the magnesium sulfate and the magnesium chloride is 2.0-3.5:8.0-6.5. The component (II) is a natural fiber (plant and / or animal) which is modified by cation modifiers. The fiber radical sewage decoloration and purification material integrates multiple functions such as decoloration, flocculation, entanglement and COD removing. The decoloration ratio of sewage can reach more than 93%, the COD value removing rate is higher than that of the prior art by more than 10%, reclaimed water reusing can be achieved, and sewage discharging is reduced.

The invention discloses a method for preparing stevia polyphenols by using a composite chitosan flocculation method, and belongs to the technical field of plant extraction. In the present invention, the water extract of stevia leaf is flocculated and removed with composite chitosan at room temperature, and the supernatant is adsorbed with a macroporous polar resin; the effluent is used to further extract steviol glycosides; the resin is eluted with alcohol aqueous solutions of different concentrations , after elution with low-concentration alcohol aqueous solution, the obtained analysis solution is combined with the effluent before analysis to obtain a combined solution, the total phenol content in the combined solution is less than 0.5% (on a dry basis), and the combined solution is retained for extracting steviol glycosides. The eluate after elution with high-concentration alcohol aqueous solution is dried to obtain stevia polyphenols mainly composed of isochlorogenic acid. The invention realizes the simultaneous production of stevia polyphenols with high isochlorogenic acid on the basis of the original steviol glycoside production process, realizes the comprehensive utilization of stevia, and improves the economic benefits of enterprises.

The invention provides a method for preserving Isochrysis globosa, which belongs to the technical field of microalgae cultivation. The method comprises the following steps: 1) Cultivating Isochrysis globosa with an f / 2 medium containing a mixed antifreeze agent. Obtaining Isochrysis globosa culture medium in the logarithmic growth phase; 2) Adding ferric chloride to the Isochrysis globosa culture fluid described in step 1) for flocculation to obtain flocculated Isochrysis globosa cells; 3) The flocculated Isochrysis globosa cells are collected, freeze-dried, and sealed for storage; the mixed antifreeze agent in step 1) includes dimethyl sulfoxide and methanol. Using the method of the present invention to preserve Isochrysis globosa, after one year of storage at room temperature, the survival rate of the Isochrysis globosa cells can reach 92%, which is far greater than the cell survival rate of conventional preservation methods.

Belonging to the technical field of waste treatment, the invention in particular relates to a purification process for coal fired power plant desulphurization sewage. The method comprises the steps of: 1. adjusting the pH value to alkaline; 2. adding a chelating agent and fully stirring the materials till no generation of floc; 3. adding inorganic high molecular polymer magnetic powder, and fully stirring the materials; 4. adding an organic high molecular polymer, and fully stirring the materials; 5. conducting solid-liquid separation until all the flocs settle, and discharging the lower sediment; and 6. adjusting the pH value to neutral. The process provided by the invention adopts simple system and steps to completely and effectively remove the neutral salt, suspended solids, fluorides, sulfides, heavy metal ions and other harmful pollutants from the sewage, and has the characteristics of low cost and simple operation, etc.

The invention relates to a device and a method for integrally processing garbage percolate, wherein the device comprises a denitrification mechanism, a polymerizing reaction tank, a sloping plate / pipe sedimentation tank, a biochar filter bed, an SMBR reactor and a medicine dissolving and dispensing mechanism, wherein the medicine dissolving and dispensing mechanism comprises three parallel medicine dissolving tanks including an alkali liquor tank, a flocculation liquid medicine tank and a flocculation aid liquid medicine tank; the three medicine dissolving tanks are respectively communicated with an alkali liquor medicine adding hole on a liquid inlet pipe of a stripping tower and a flocculation medicine adding hole and a flocculation aid medicine adding hole of pipelines communicated with a denitrification settling water tank and the polymerizing reaction tank. The treatment method comprises ammonia nitrogen stripping, coagulating sedimentation, biochar filter bed treatment, SMBR reactor treatment, nanofiltration and / or reverse osmosis treatment. The device and the method consist of a high-efficiency ammonia nitrogen stripping tower, whirl grid coagulation, sloping plate (pipe) setting, the biochar filter bed and the SMBR reactor, integrates the advantages of a garbage percolate treatment process and solves the problem of difficult treatment and high expense of the garbage percolate. The high-efficiency ammonia nitrogen stripping tower has high utilization rate on gases, a new gas distribution structure improves the energy efficiency, and the invention has the advantages of reducing the occupied area and reducing the operation expense.