46results about How to "Reduce organic pollution" patented technology

The invention discloses treatment technique of waste water generated in production of o-nitrophenol. The treatment technique comprises the following steps: firstly, pretreating waste water, entering a resin adsorption column for adsorption, desorbing the resin by adopting NaOH solution after the resin adsorption is saturated, adding acid into high-concentration desorption solution for acidizing so as to recover o-nitrophenol, wherein a low-concentration desorption solution sleeve is used for desorption, distilling and purifying the recovered o-nitrophenol, conducting hydrogenation and catalysis to produce o-nitrophenol; carrying out ozone oxidation, neutralization and decoloration on the waste water after being subjected to adsorption treatment, thereby becoming qualified salt water. After the technique is adopted, organic pollution of the waste water to water environment is lightened, the resource utilization can be realized, and the treatment technique has great economic values and practical values in treating the waste water generated in production of o-nitrophenol.

An organic EL light emitting module includes an organic EL light emitting panel 5 including an organic EL light emitting unit 52 formed on a substrate 51 and electrode terminals 53 for supplying power to the organic EL light emitting unit 52; a circuit substrate 3, electrically connected to the electrode terminals 53, for supplying power to the electrode terminals 53; and a casing 4 to which the organic EL light emitting panel 5 and the circuit substrate 3 are attached. The electrode terminals 53 are disposed at left and right end portions of the organic EL light emitting panel 5 having a substantially rectangular shape when viewed from the top, and extended portions 4a protruding by a predetermined width are formed at side surfaces of the casing 4 where the electrode terminals 53 of the organic EL light emitting panel 5 are absent.

The invention relates to a pressurized dissolved air flotation cleaning method for organic pollutant on a reverse osmosis membrane, which belongs to the technical field of membrane separation in the chemical engineering science. The pressurized dissolved air flotation cleaning method adopts a high-pressure pump to send a cleaning liquid into a pressurized dissolved air flotation device from a raw water tank; the cleaning liquid is mixed with air which is then dissolved in the cleaning liquid; after the pressure is reached, an outlet valve is opened and the air is released into microbubbles in the state of dissolution; the bubbles are fully mixed with the cleaning liquid, and mixed gas-liquid mixture is sent into the raw water tank for circulation; generated gas-liquid mixed cleaning liquid is inputted into a reverse osmosis membrane machine from the other high-pressure pump, so as to clean the organic pollutant on the membrane; and the cleaning liquid is circulated into the raw water tank. The pressurized dissolved air flotation cleaning method achieves the cleaning efficiency by recording of the time variation of parameters of the cleaning liquid and the variation of the permeation flux of standard water before and after the reverse osmosis membrane is polluted. The pressurized dissolved air flotation cleaning method obviously improves the cleaning efficiency of the organic pollutant of the reverse osmosis membrane, prolongs the service life of the membrane, and reduces the cost of a medicine for cleaning the membrane.

The invention discloses an antibiotic wastewater advanced treatment and reuse method. The method is characterized in that advanced treatment of biochemically treated antibiotic wastewater is carried out by adopting an active carbon filtration-pH value adjustment-nanofiltration combined process, active carbon filtration is used to further remove non-degradable organic compounds residual in biochemical discharged water and reduce the organic pollution of a nanofiltration membrane, the pH value of active carbon discharged water is adjusted to reduce the inorganic pollution of the nanofiltration membrane, residual organic matters and multivalent ions in wastewater are effectively removed by using the nanofiltration membrane, and the TOC, the COD, the chroma and the SO4<2-> removal rate of nanofiltration water are less than 1mg/L, less than 10mg/L,0PCU and more than 98% respectively. The method realizes the antibiotic wastewater treatment and reuse. The method has the advantages of simple process flow, low cost recycling of difficult-treatment antibiotic wastewater, and suitableness for the advanced treatment of the biochemically treated antibiotic wastewater.

The present invention relates to a papermaking method. The papermaking method comprises the following steps: (a) a cation starch complex agent is added into starch-containing pulping white water or astarch aqueous solution to react, and a modified starch solution is obtained; (b) fibers or paper pulp is added into the modified starch solution and stirred, an adsorption reaction is conducted, andpulp subjected to reaction is obtained; and (c) the pulp subjected to reaction is prepared to form a paper product, wherein the chemical structure of the cation starch complex agent is composed of thefollowing parts: (i) one or more hydrophobic groups and (ii) one or more hydrophilic groups, the one or more hydrophobic groups can react with starch to produce an inclusion complex, and the hydrophilic groups and the hydrophilic groups are located at the two ends of the same molecular structure correspondingly and connected through chemical bonds to form the asymmetrical and polar structure. According to the papermaking method, the adsorption rate of the starch on the surfaces of the fibers or in the paper pulp can be increased, thus the retention rate of the starch in paper is increased, and COD emission is lowered.

Compositions based on polycarbonate copolymers to provide ultra-clean materials and articles useful in the hard disk drive and semiconductor industries. In one aspect, the compositions include a polycarbonate copolymer based on a sebacic acid, BPA, PCP polyestercarbonate. The compositions may be used with or without other polymers, fillers or additives. The compositions based on this polycarbonate copolymer exhibit ultra clean performance, low organic contamination, low LPC, and low ionic contaminations. Meanwhile, the compositions also exhibit good flow ability, good ductility and good surface quality.

The invention relates to modified starch as well as a preparation method and application thereof. The modified starch is mainly prepared by reacting an anionic starch complexing agent with starch, wherein the chemical structure of the anionic starch complexing agent is composed of i) one or more hydrophobic groups, at least one of which is capable of reacting with starch to generate an inclusion complex, and ii) one or more hydrophilic groups, at least one of which is an anionic hydrophilic group; wherein the hydrophobic group and the hydrophilic group are respectively positioned at two ends of the same molecular structure and are connected through chemical bonds to form an asymmetric and polar structure. When the modified starch is used for papermaking, the adsorption rate of the starch on the fiber surface or in paper pulp can be increased, so that the retention rate of the starch in paper is increased, the strength of the paper can be improved, the loss of the starch in the pulpingand papermaking process is reduced or even eliminated, and the COD emission is reduced.

The invention relates to the technical field of thermal power plant wastewater advanced treatment and recycling, in particular to a thermal power plant circulating water sewage recycling treatment system which comprises an organic matter removal unit, microfiltration equipment, a softening unit and a membrane treatment unit. The organic matter removal unit comprises a circulating water and sewage buffer tank, and the circulating water and sewage buffer tank is sequentially connected with a lifting pump and a micro-flocculator; the softening unit comprises a middle water tank, the water inlet end of the middle water tank is connected with the micro-flocculator, and the water outlet end of the middle water tank sequentially communicates with a first softening tank and a second softening tank; the organic matter removal unit and the softening unit are both connected with the microfiltration equipment; the membrane treatment unit comprises a pH value adjusting tank and a reverse osmosis system, one end of the pH value adjusting tank communicates with the second softening tank, and the other end of the pH value adjusting tank communicates with the input end of the reverse osmosis system; and the output end of the reverse osmosis system is provided with a reverse osmosis water production tank and a reverse osmosis concentrated water tank. The problems that existing equipment is incomplete in pretreatment, serious in membrane pollution and blockage, low in system recovery rate and the like can be solved.

The invention relates to a papermaking method which comprises the following steps: a) adding an anionic starch complexing agent into starch-containing pulping white water or a starch aqueous solutionfor reaction to obtain a modified starch solution; b) adding fibers or paper pulp into the modified starch solution, stirring the solution, and carrying out adsorption reaction to obtain reacted pulp;c) preparing the reacted pulp into a paper product; the chemical structure of the anionic starch complexing agent is composed of i) one or more hydrophobic groups, at least one of which is capable ofreacting with starch to generate an inclusion complex, and ii) one or more hydrophilic groups, wherein the hydrophobic group and the hydrophilic group are respectively positioned at two ends of the same molecular structure and are connected through chemical bonds to form an asymmetric and polar structure. According to the papermaking method, the adsorption rate of the starch on the fiber surfaceor in paper pulp can be increased, so that the retention rate of the starch in paper is increased, and the COD emission is reduced.

The invention relates to modified starch and a preparation method and application thereof. The modified starch is mainly prepared from a starch aqueous solution and a cationic starch complexing agent;the chemical structure of the cationic starch complexing agent is composed of the following parts: (i) one or more hydrophobic groups, wherein at least one hydrophobic group is capable of reacting with starch to form an inclusion complex, and (ii) one or more hydrophilic groups, wherein at least one of the hydrophilic groups is a cationic hydrophilic group; and the hydrophobic groups and the hydrophilic groups are separately located at two ends of a same molecular structure and are bonded through chemical bonds to form an asymmetric and polar structure. The modified starch is used for papermaking, the adsorption rate of the starch on the surface of fibers or in pulp can be greatly increased, so that the retention rate of the starch in paper is increased, the strength of the paper can be improved, the loss of the starch in the pulping and papermaking processes is reduced or even eliminated, and thus COD emissions are reduced.

The invention discloses a refuse landfill leachate treatment method and system. The method comprises the following steps: adding a coagulant into leachate raw water for coagulating sedimentation to obtain a mixed solution; carrying out filter pressing on the precipitate in the mixed solution to obtain filter-pressed effluent; carrying out microfiltration treatment on the supernatant in the mixed solution to obtain microfiltration concentrated water and microfiltration produced water; reflowing the filter pressing effluent and the microfiltration concentrated water into the percolate raw waterfor circular treatment; and finally, carrying out two-stage DTRO treatment and resin adsorption treatment to obtain up-to-standard produced water. Long-term stable operation of the landfill leachate treatment system is ensured through multiple combined processes, and up-to-standard discharge of produced water is ensured; part of organic matters and large suspended particles can be removed throughcoagulating sedimentation, organic pollution of a subsequent micro-filtration membrane is relieved, colloid can be effectively intercepted through micro-filtration treatment to remove hydrogen sulfide, the problems that a membrane is polluted by two-stage DTRO colloid, even a flow channel is blocked and sulfur pollution is caused can be solved, and the method and the system are suitable for treating stock landfill leachate and biochemically poor aged leachate.

The invention relates to a method for recovering free starch in papermaking whitewater. The method comprises the step of performing a reaction on a cationic starch complexing agent and the free starchin the papermaking whitewater so as to modify the free starch, wherein the cationic starch complexing agent comprises the chemical structure: (1) one or more hydrophobic groups, wherein at least onehydrophobic group can reacts with the starch so as to form an inclusion complex, and (2) one or more hydrophilic groups, wherein at least one of the hydrophilic groups is a cationic hydrophilic group;and the hydrophobic groups and the hydrophilic groups are separately at both ends of the same molecular structure, and are connected through chemical bonds so as to form an asymmetric and polar structure. Through the method, the content of the free starch in the papermaking whitewater can be reduced effectively, so that the COD emission of papermaking wastewater is reduced.

The invention relates to a method for recovering free starch in papermaking white water. The method comprises the following steps: (a) reacting an anionic starch complexing agent with the free starchin the papermaking white water to modify the free starch; wherein the chemical structure of the anionic starch complexing agent is composed of i) one or more hydrophobic groups, at least one of whichis capable of reacting with starch to generate an inclusion complex, and ii) one or more hydrophilic groups, at least one of which is an anionic hydrophilic group; wherein the hydrophobic group and the hydrophilic group are respectively positioned at two ends of the same molecular structure and are connected through chemical bonds to form an asymmetric and polar structure. The method can effectively reduce the content of free starch in papermaking white water, thereby reducing the COD discharge amount of papermaking wastewater.

The invention provides a waste slurry conditioning agent system, and an application method thereof. The application method comprises following steps: (1) waste slurry overflowing in oilfield drilling is subjected to mixing treatment with polysilicate aluminum ferric and oxidizing agent sodium ferrate (or potassium ferrate) for 10 to 20min, wherein the adding amount of polysilicate aluminum ferric is controlled to be 100 to 500mg/L, the adding amount of the oxidizing agent is controlled to be 50 to 200mg/L, and time interval of adding of polysilicate aluminum ferric and adding of the oxidizing agent is controlled to be 20 to 30s; (2) nut shell particles are added into an obtained mixed slurry for uniform mixing, wherein microorganisms are attached to the surfaces of the nut shell particles; (3) a stacked spiral sludge dewatering machine is used for treating an obtained sludge mixture; (4) filtrate obtained via filtration using the stacked spiral sludge dewatering machine is used for preparing new slurry used for drilling of the drilling crew; and (5) residue obtained via sedimentation is taken as a standard well site subgrade material.

The invention discloses a biochar-based fertilizer and a preparation method thereof. The biochar-based fertilizer is prepared from the following raw materials in percentage: 20-30% of humus soil, 10-20% of pig manure, 10-15% of straw ash, 10-15% of charcoal, 10-15% of poultry bones, 10-15% of fruit shells, 1-2% of urea, 1-2% of calcium superphosphate, 1-2% of potassium chloride, 1-2% of magnesium sulfate and 1-2% of ammonium chloride. According to the prepared biochar-based fertilizer and the preparation method thereof, the biochar-based fertilizer prepared by matching humus soil and pig manure with straw ash, charcoal, poultry bones and fruit shells is loose in pores and good in air permeability, can purify water and is beneficial to reducing the use of chemical fertilizers; and the fertilizer can increase crop yield, improve agricultural product quality, improve soil fertility, reduce nutrient loss, and reduce soil heavy metals.