Nanjing University

Nanjing University & Yancheng Academy of Environmental Protection Technology and Engineering

Nanjing University Yancheng Environmental Protection Technology and Engineering Research Institute

Nanjing Normal University

Est Water and Technologies Co., Ltd

Jiangsu Guochuang Enviro-protection Technology Co., Ltd

Nanjing Quankai Research Institute of Biomaterials Co., Ltd.

Aimin Li

Chendong Shuang

Qing Zhou

Quanxing Zhang

Wei Huang

Hong Li

Fuqiang Liu

Mengqiao Wang

Yeli Jiang

Wentao Li

Bicun Jiang

Wei Dong Wang

Wei Jiang

Yan Li

Chao Long

Jun Fan

Zhaolian Zhu

Mancheng Zhang

Haibo Li

Zixiao Xu

Guang Zhang

Ke Wang

Jinnan Wang

Weiwei Zhou

Jianjun Dai

Zhijian Yao

Xinchun Ding

Xiangqian Sun

Xun Chen

Jiaye Sheng

Qimeng Li

Yaping Wu

Ting Ye

Wenxiang Ji

Peng Shi

Yuze Han

Ke Shen

Changming Wang

Jun Wang

Zheng Wang

Yang Zhou

Yi Zhang

Hu Yang

Changqing Zhu

Wei Zhao

Ji Wu

Jie Sun

Na Cheng

Xupeng Zong

Jichun Wu

Weiben Yang

RuiHua Li

Bojun Wang

Xiaowei Sun

Yu Huang

Jingyi Jiang

Li Song

Baijun Wang

Yunlong Xu

Cailiang Yue

Xiang Peng

Chen Ling

Lichun Fu

Weiwei Zhao

Yiting Song

Ling Xu

Congjian Huang

Yanhong Zhang

Xiao Zhang

Danning Jiang

Yinsen Li

Yunshu Wang

Youdong Zhou

Zhaoyang Lu

Minhui Cai

Dongmei Li

Lili Liu

Shi Cheng

Jinli Qiu

Ranran Yuan

Yanting Zuo

Wei Jiao

Yuzhi Xue

Jiali Tang

Qingqing Zhao

Liang Tan

Guangyan Zhang

Minglu Wang

Rui Gao

Jianjun Zhuang

Xiaowen Ma

Junsong Hu

Qianqian Sun

Haonan Jiang

Xiaomei Zhang

Zhuo Liu

Chunming Chen

Xinmin Zhan

Pei Fan

The present invention belongs to the technical field of water treatment, and in particular to a magnetic powder strengthened method for removing nitrate nitrogen and inorganic phosphorus, which includes the following steps: (1) mixing permanent magnetic material powder with paramagnetic Fe3O4 powder, and magnetizing the mixture in a magnetic field to prepare magnetic powder; (2) adding the magnetic powder directly or in a form of granular filler into a water treatment reaction vessel; and (3) allowing the to-be-treated water to enter the water treatment reaction vessel, performing a chemical reaction of removing nitrate nitrogen and inorganic phosphorus in the presence of a reducing agent, and discharging the water after the reaction is completed. By adopting the method of the present invention, a uniform and fine magnetic field can be provided, thus the reaction efficiency is improved, and the process is simplified and the cost is lowered.

Magnetized powder strengthened method for removing nitrate nitrogen and inorganic phosphorus

The invention discloses a synthesis method and device for rapidly producing lactide at high yield. The method comprises: adding a single component of lactic acid or two components of lactic acid and catalyst, passing the mixture through a mixer to enter an oligomer preparation system, increasing a residence time through bottom circulation, synthesizing oligomeric lactic acid, and passing a gas-phase component through a rectification system. With the adoption of the device, the lactide is capable of being efficiently synthesized, crude lactide with a yield of 94% to 98% is capable of being obtained.

Synthesis method and device for rapidly producing lactide at high yield

A magnetic polymer adsorption material, preparation method and use thereof, which relate to the field of magnetic polymer materials. The preparation method comprises: (1) preparing magnetic nanoparticles; (2) dissolving the magnetic nanoparticles in a pore-forming agent, adding N-vinylpyrrolidone, divinylbenzene and an initiator respectively, and mixing uniformly; (3) adding an emulsifier and a dispersant into an aqueous solution; adding a part of the oil phase solution prepared in step (2) at the temperature below 60&#xb0; C., and adding the rest of the oil phase solution when the temperature rises to 60&#xb0; C. or above, reacting with stirring, precipitating and filtering the reacted solution, washing and drying the precipitate, and finally obtaining the magnetic polymer adsorption material. The material has the particle size of 2-100 &#x3bc;m, the magnetization of 5-19.5 emu/g and the specific surface area of 210-950 m/g, and can be applied to the adsorption of inorganic and organic matters in solutions, the controlled release of inorganic and organic matters, and the separation of different substances.

Magnetic polymer adsorption material, preparation method therefor and application thereof

Disclosed is an organic carbon detector that can be used with a liquid chromatography equipment such as a size exclusion chromatography. The organic carbon detector contains a carbon oxidization subsystem and a stripping and COdetection subsystem arranged and detachably connected with each other in said order. The carbon oxidization subsystem contains a microfluidic agent injection module (), an inorganic carbon removal module (), a microfluidic ultraviolet oxidation module () and a vacuum pumping system (), configured to remove inorganic carbons and oxidize organic carbons. The stripping and COdetection subsystem contains a stripping module () and a COdetector (), using a carrier gas to transfer the organic carbon converted gas to the COdetector (). Also disclosed is a method of using the organic carbon detector in water quality monitoring.

Organic carbon detector for liquid chromatography and use thereof

A magnetic strong base anion exchange resin with high mechanical strength and a preparation method thereof, belonging to the field of resin materials. The preparation method comprises steps of: adding a conventional strong base anion exchange resin to a mixture of trivalent iron salt and divalent iron salt, and then mixing the resin adsorbed with the iron salt with aqueous ammonia so that FeOnanoparticles are contained in the resin structure. Then, the resin containing FeOnanoparticles is added to alcoholic solution dissolved with silane coupling agent to form a dense SiOcoating on the surface of the resin, so as to obtain magnetic strong base anion exchange resin with high mechanical strength.

Magnetic strong base anion exchange resin with high mechanical strength, and preparation method thereof

A method for preparing a bi-component, multi-network nanofibrous aerogel-supported heterojunction photocatalyst includes the following steps. Step 1, preparing ammoniated polyacrylonitrile nanofibers. Step 2, dispersing the ammoniated polyacrylonitrile nanofibers in water to obtain a first solution; dispersing cellulose nanofibers in water to obtain a second solution; and mixing, heating and lyophilizing the first solution with the second solution to obtain a bi-component, multi-network nanofibrous aerogel. Step 3, adding graphite carbon nitride, a ferric-iron containing reagent, 2,5-diaminoterephthalic acid, and the bi-component, multi-network nanofiber aerogel obtained in the step 2 into a N, N-dimethylformamide solvent to obtain a third solution, and carrying out a hydrothermal reaction on the third solution for 8-24 hours to obtain the bi-component, multi-network nanofibrous aerogel-supported heterojunction photocatalyst.

Method for preparing bi-component, multi-network nanofibrous aerogel-supported heterojunction photocatalyst and application thereof

In view of the current pollution to sewage by nitrate nitrogen, the present invention discloses a method for promoting denitrification to remove nitrate nitrogen in water by magnetic resins. In the method disclosed by the present invention, magnetic anion exchange resins are in contact with and mixed with sewage, and nitrate nitrogen in the sewage is removed quickly and efficiently by both the ion exchange between the magnetic anion exchange resins and the nitrate nitrogen in the sewage and the denitrification enhanced by the magnetic material. Meanwhile, the regeneration and recycle of the magnetic anion exchange resins are realized by the denitrification of microorganisms.

Method for promoting denitrification to remove nitrate nitrogen in water by magnetic resins

The invention discloses a fixed bed counter-current regeneration device for ion exchange resin and the method of use, relates to the field of ion exchange resin regeneration. The device comprises a cyclone separator, a regeneration reactor, a fully mixed resin reactor, a desorption solution storage tank, and a regenerant storage tank, wherein the cyclone separator is placed on top of the regeneration reactor, the upper part of the cyclone separator is connected to the fully mixed resin reactor. A resin inlet is provided at the bottom of the cyclone separator, a resin bed and a resin filter are arranged inside the regeneration reactor, a resin outlet and a regenerant inlet are arranged at the bottom of the regeneration reactor, the resin outlet is connected to the fully mixed resin reactor, the regenerant inlet is connected to the desorption solution storage tank and the regenerant storage tank, respectively, one side of the regeneration reactor is further provided with a regenerant outlet, and the regenerant outlet is connected to the desorption solution storage tank. The invention effectively improves resin regeneration efficiency via separator and counter-current, reduces the desorption solution yield, prevents mechanical wear and tear of the resin, and can be used as part of large-scale ion exchange resin applications.

Fixed bed counter-current regeneration device of ion exchange resin and application method of fixed bed counter-current regeneration device

Disclosed is a composite LED module comprising a 230&#xb1;10 nm deep-ultraviolet light LED, a 275&#xb1;10 nm deep-ultraviolet light LED, and 0 to 3 visible light LED(s), packed in a same substrate. Also disclosed are a water quality monitoring device and a water quality monitoring probe containing the composite LED module.

Composite LED module and water quality monitoring device using the same

Implementations herein relate to a method for preparing organic-pollution-resistant ion exchange resins and application thereof. The method includes adding modified inorganic particles to prepare novel ion exchange resins containing inorganic particles modified by a parcel modifier. A weight ratio between the monomer of the ion exchange resins and the modified inorganic particles is about 0.1% to 30%. The method may increase moisture content of the resins 3 to 30% such as to improve the structures of the resins, and therefore increase the regeneration efficiency 0.4 to 70%, as compared to conventions resins. The method improves resistance of resins to organic pollution, increases regeneration efficiency, and extends service life of the resins. In the process of water treatment, the ion exchange resin of the implementations may be regenerated with long-term stability. In addition to securing the water treatment efficiency, the method may avoid frequent replacement operations and lower the costs.

Organic-pollution-resistant ion exchange resin and preparation method and application thereof

A polyvinylidene fluoride (PVDF) casting membrane solution is shaped as a flat sheet membrane by thermally induced phase separation (TIPS), the PVDF membrane is defluorinated with an alkaline potassium permanganate solution, and then the carbon chain is extended with glycidyl methacrylate (GMA) as the graft monomer, and finally the nucleophilic substitution is carried out between melamine and GMA to produce a chelating microfiltration membrane for capturing and enriching heavy metals with high flux and high capacity.

Preparation, regeneration and application of a chelating microfiltration membrane

A method for green synthesis of uniform- and large-particle-size polystyrene particles, comprising steps of: prepolymerizing styrene at 70&#x25a1; to 75&#x25a1; for 1 h to 6 h in advance while stirring, adding divinylbenzene dissolved with initiators to the styrene, and stirring for 10 min to 30 min to obtain oil phase; heating lactic acid or an aqueous solution of lactic acid to 70&#x25a1; to 80&#x25a1;, adding the oil phase to dispersed phase by a constant-pressure device, maintaining the temperature for 2 h, heating to 80&#xb1;5&#x25a1; and then maintaining the temperature for 1 h, and heating to 85&#xb1;5&#x25a1; and then maintaining the temperature for 3 h to 6 h, to obtain polystyrene particles with a uniform particle size ranging from 0.7 mm to 2.0 mm.

Method for green synthesis of uniform- and large-particle-size polystyrene particles

A method of purifying a cyclic ester, the method including: granulating a crude cyclic ester, an average particle size of resulting granules being 0.05-1.00 mm; adding the granules to 0-4&#xb0; C. water to yield a mixture, a mass ratio of the water to the granules being (0.5-2):1; stirring the mixture, and performing solid-liquid separation on the mixture; repeating the stirring and solid-liquid separation for 1-4 times, to yield a purified cyclic ester; drying the purified cyclic ester at 0-4&#xb0; C. and at an absolute pressure of less than or equal to 10 pascal for 4-6 hours, and continually drying the purified cyclic ester at 40-60&#xb0; C. and at an absolute pressure of less than or equal to 5 pascal for 1-2 hours.

Method of purifying cyclic ester

A device comprises a contact reaction chamber, a circulating water inlet, a clear water basin, a circulating pump, a circulating water outlet, a solid phase extractant collecting tank, a magnetic holder, an electromagnet, a solid-liquid separation area, a drain valve, a wall sprinkling water inlet, and a wall sprinkling pipe, wherein, the contact reaction chamber is in a conical shape, and utilizes hydraulic power to perform stir to ensure no dead corner exists during contact stir; the obconical solid-liquid separation area increases the action area between a magnetic solid phase extractant and the electromagnet; the solid phase extractant collecting tank is in a downwards protruding dish shape to prevent the solid phase extractant from losing.

Portable efficient magnetic solid phase extraction device and extraction method thereof

The field of advanced wastewater treatment, and more specifically, to a natural pyrrhotite biofilter and a method for utilizing same to synchronously remove nitrate-nitrogen and phosphorus from water is provided. The method includes the following steps: (1) preparation of the packing material and construction of the biofilter; (2) start-up of the biofilter; (3) operation of the biofilter. The method disclosed in the present invention on the one hand takes pyrrhotite as the electron donor to help sulfur-based autotrophic denitrifying bacteria reduce nitrates into nitrogen gas, and on the other hand utilizes pyrrhotite and its oxidates to eliminate phosphorus through adsorption and chemical precipitation. Therefore, this method realizes synchronous removal of nitrate-nitrogen and phosphorus in water.

Natural pyrrhotite biological filter and method for utilizing same to synchronously remove nitrate-nitrogen and phosphorus from water

Growing community of inventors

Nanjing, China

Aimin Li