33 results about "Ammonia assimilation" patented technology

The invention discloses efficient energy-saving coupling stripping deamination equipment and method. The equipment mainly comprises an I-effect evaporator, an II-effect evaporator, an inlet/outlet heat exchanger, a stripping deamination tower, an ammonia absorption tower and a circulation pump. The method comprises the following steps: heating the ammonia-nitrogen wastewater through the inlet/outlet heat exchanger and then feeding the heated ammonia-nitrogen wastewater into the stripping deamination tower; performing stripping deamination by utilizing circulating steam and fresh steam; feeding the ammonia steam contained in the top of the stripping deamination tower into the ammonia absorption tower by a steam circulator; absorbing the ammonia in the circulating steam by utilizing sulfuric acid to obtain ammonium sulfate solution; returning the purified steam to the stripping deamination tower for cyclic use; and feeding the ammonium sulfate solution to a double-effect evaporation section, and heating the ammonium sulfate solution by utilizing the fresh steam serving as a heat source for evaporation, obtaining solid ammonium sulfate, wherein the steam obtained by evaporating the ammonium sulfate solution in the II-effect evaporator is returned to a steam circulation efficient stripping deamination section by a steam conveyer and used as deamination steam. Through the invention, the wastewater with high ammonia nitrogen content can be treated, the ammonia nitrogen content in the discharged wastewater after treatment is low, and the steam consumption is low.

The invention discloses a phenol-amine wastewater treatment and recycling method and device. The device comprises a water collection tank, a primary settling tank, an adjusting tank, a stripping and ammonia absorption system, an A/A/O-the MBR reaction tank, a biochar hydrolysis, nitrification and fluidization system and an immersed ultrafiltration system which are connected in series according tothe flow of the wastewater treatment. The device of the invention adopts the method combining the main physicochemical technology and the auxiliary biochemical technology, thus effectively reducing the operating cost, wherein the physicochemical technology is mainly used to reduce the concentration of ammonia nitrogen, remove suspended matter (SS) and insoluble, slightly soluble and refractory CODcr and increase the B/C ratio; and the biochemical technology is mainly used to remove CODcr and BOD5 and reduce the chroma. The device of the invention has very good treatment effect on the wastewater with high ammonia nitrogen and high phenolic compounds; and the treated wastewater meets the discharge standards and can be directly discharged or further treated for reuse, thus saving the energy.

The invention discloses a process and a device for producing strong ammonia water through negative pressure operation, and belongs to a coking chemical product recovery technology. Ammonia steam from an ammonia steaming tower dephlegmator is cooled by a condenser to be partially condensed, condensed liquid is discharged to the bottom of an ammonia recovering tower through the gravity action, and the non-condensed ammonia steam and noncondensable gas are pumped by a dry vacuum pump to generate negative pressure; the gas phase pumped through the dry vacuum pump is heated and pressurized to enter the ammonia recovering tower, ammonia removal is conducted by circulating ammonia water cooled externally, and the recovery rate of the ammonia is 90 to 95 percent; the noncondensable gas at the top of the ammonia recovering tower and containing a small amount of ammonia is directly discharged into a gas pipeline in front of an ammonia absorbing device or an ammonia process oxidation desulfurization device, and a strong ammonia water product with the mass concentration being 15 to 25 percent is obtained at the bottom of the tower; the process can meet negative pressure ammonia steaming operation with various vacuum degrees, and has the advantages of small equipment investment, low energy consumption, simple flow, low operation cost, no environmental pollution and the like.

The invention provides a method for accelerating the synthesis of corynebacterium crenatum L-arginine through enhancing ammonia assimilation. Specifically, the yield of the corynebacterium crenatum SDNN403 L-arginine can be effectively improved through excessive co-expression of a glutamine synthase coding gene glnA and a glutamate dehydrogenase coding gene gdh of a key enzyme corynebacterium crenatum source of an ammonia assimilation way, and an aspartase coding gene aspA of an escherichia coli source in the corynebacterium crenatum SDNN403.

The invention provides a coupling control method for removing SO2 and NOx by wet ammonia absorption method applied to comprehensive energy. The method includes: the practical ammonia supplement quantity, during a pH value control process, is regulated by the decoupling coefficient in a decoupling module and then is added to a desulfuration control step; when the ammonia quantity target set value is changed, pre-adjustment on the circulating quantity of absorption solution is conducted so as to counteract a part of interference, and the parameters during the process are more stable, thus maintaining the system reliability. In the invention, a sectional decoupling scheme is designed, wherein corresponding decoupling coefficients are set according to different input quantity of ammonia in a spray diffusion column, wherein the coefficients are switched in the operation process, thus achieving the sectional decoupling control. The ammonia addition quantity in the practical production is divided into three ranges, wherein the decoupling coefficients corresponding to the three ranges are obtained through tests, and corresponding decoupling coefficient is selected according to the range ofthe present ammonia quantity for regulation, thereby improving control precision.

An ammonia absorber comprises a shell-and-tube ammonia absorber shell and channel boxes on both ends, wherein one channel box on one end is provided with a circulating water inlet and a circulating water outlet; the shell is provided with a stronger ammonia water outlet at the bottom, tube sheets on both ends and a tube bundle. The ammonia absorber is characterized in that ammonia inlets are arranged on both sides of the shell; ammonia uniform distribution plates are arranged at the ammonia inlets which are on both sides of the shell; evenly distributed gas inlet micropores are arranged on the uniform distribution plates; the upper part of the shell is provided with a longitudinal water distributor with a water inlet, the lower part of the longitudinal water distributor is connected with evenly distributed water distribution holes on the upper part of the shell through water distribution pipes, a spraying plate is arranged below the water distribution holes in the shell; and evenly distributed micropores are arranged on the spraying plate. The invention has the advantage that the spraying plate which is arranged longitudinally and ensures that the height of the spraying liquid column is constant, is adopted, thus spraying is uniform and stable and the capability of resisting the fluctuation of load is high, and ammonia passes through profiled channels to ensure that the absorption efficiency is up to 100%.

The invention discloses a method and device for producing ammonium hydroxide by an ammonia synthesis purge gas system. The device comprises an ammonia absorption tower, an ammonia stripping tower, anammonium hydroxide tank, an ammonium hydroxide heat exchanger, an ammonium hydroxide water cooler and an ammonium hydroxide reboiler. The ammonia absorption tower is connected with a front-end ammoniasynthesis system and used for absorbing ammonia synthesized by the front-end ammonia synthesis system. The ammonia stripping tower is communicated with the ammonia absorption tower through a first pipeline and a second pipeline, and a circulating pipeline is arranged on the side wall of the ammonia stripping tower. The ammonium hydroxide tank is communicated with the ammonia absorption tower through a third pipeline and used for producing ammonium hydroxide in different concentrations. The ammonium hydroxide heat exchanger is used for heat exchange of substances in the first pipeline and thesecond pipeline. The ammonium hydroxide water cooler is arranged on the first pipeline. The ammonium hydroxide reboiler is arranged on the circulating pipeline. The method and the device have advantages that consumption of medium pressure steam in the purge gas system is reduced, energy saving and consumption reduction are realized, system operation is stabilized, and an ammonium hydroxide productis added.

The invention relates to a continuous glycine synthesis method. The method comprises the following steps: preparing ammonia water; then mixing a chloroacetic acid solution with the ammonia water for asalifying reaction to obtain a solution A; dividing a mixed solution containing urotropin and ammonia water into a plurality of parts, separately adding the plurality of parts of the mixed solution into the solution A, carrying out an ammoniation reaction, and then performing cooling, crystallizing, and separating to obtain a mixed crystal of glycine and ammonium chloride and a mixed crystal mother liquor; taking the mixed crystal mother liquor as a solvent for preparing the ammonia water used in the step (1) or the chloroacetic acid solution used in the step (2); and continuing the reactionto realize continuous synthesis of glycine. According to the invention, a conventional one-step method is divided into three parts, i.e., ammonia dissolution, a salifying reaction and the ammoniationreaction, so a required amount of the ammonia water can be uniformly mixed with feed liquid, the problem of generation of many byproducts caused by local overheating due to ammonia absorption or a toohigh pH value of local feed liquid is avoided, the defects of conventional processes are effectively avoided, glycine yield is increased, and urotropine consumption is reduced.

The invention discloses a device for recovering ammonium and a concentrated protein stock solution from an ammonia-containing protein stock solution and a method thereof. The device for recovering theammonium from the ammonia-containing protein stock solution and concentrated protein stock solution comprises an adjusting mechanism, a removing mechanism, an ammonia absorption mechanism and an MVRforced circulation concentration mechanism, wherein the adjusting mechanism, the removing mechanism and the MVR forced circulation concentration mechanism are connected in sequence; the ammonia absorption mechanism is connected with the removal mechanism; the adjusting mechanism is used for adjusting the pH value of the ammonia-containing protein stock solution; the removal mechanism is used for converting NH4<+> in the ammonia-containing protein stock solution into NH3 so as to realize removal and obtain a protein stock solution; wherein the ammonia absorption mechanism is used for adsorbingNH3 from the removal mechanism and converting the NH3 into ammonia sulfate, and the MVR forced circulation concentration mechanism is used for concentrating a protein stock solution from the removal mechanism to obtain a high-concentration protein stock solution and distilled water. The device for recovering the ammonium from the ammonia-containing protein stock solution and the concentrated the protein stock solution has the advantages of low cost, good ammonium recovery effect and good protein stock solution purification effect.

This method discloses a method for treating high ammonia nitrogen wastewater with formaldehyde as an ammonia absorber. The method comprises the following steps: a, preparing materials, namely preparing 20L of ammonia nitrogen wastewater after ultrafiltration pretreatment; b, adjusting the pH value, namely adjusting the pH value of the ammonia nitrogen wastewater in heating by using wastewater treatment equipment; c, performing deamination, namely absorbing a dehydrated deamination film by using a formaldehyde solution; and d, performing material discharge, namely classifying and delivering deamination wastewater and urotropine after deamination treatment, wherein the ammonia nitrogen concentration in the ammonia nitrogen wastewater in step a is 300-10000mg/L; the heating temperature in step b is 3-45 DEG C; the pH value of the ammonia nitrogen wastewater is adjusted to 10-12; the deamination film in the step c is a hydrophobic micro-pore film which is made of polypropylene, polyethylene, polyvinylidene fluoride or polytetrafluoroethylene; and the content of formaldehyde in the formaldehyde solution of a certain concentration is 3-8%.

The present invention relates to ammonia transporter genes and use thereof. The invention relates in particular to a brewer's yeast which shows enhanced ammonia assimilation, alcoholic beverages produced using such yeast, and a method of producing such alcoholic beverages. More specifically, the invention relates to the MEP3 gene which codes for the ammonia transporter Mep3 in brewer's yeast, particularly to a yeast which can control the ammonia assimilation ability by controlling the level of expression of the nonScMEP3 gene or ScMEP3 gene characteristic to beer yeast and to a method of producing alcoholic beverages using such yeast.