38results about How to "Good social and environmental benefits" patented technology

The invention provides a method for producing and sintering a water permeable brick by utilizing municipal sludge and wet fly ash. The method is characterized by comprising the following steps that: 1. the raw materials are mixed; 2. the brick is formed; 3. the brick is dried; and 4. the brick is sintered. The method has the advantages that: 1. resources are saved, the environment is protected, and the social benefit is good; 2. organic matter in the mud and the unburned carbon in the fly ash are taken as internal combustion, the resources are saved; the product has high intensity and good permeability of water; 3. the method has good social and environmental benefits in the aspects such as supplementation of urban groundwater, adjustment of urban climate and purification of air; and 4. the production technology is simple, the production cost is low and the method has good economical benefit.

The invention relates to a method for removing silicon from phosphogypsum in an obverse floatation way under an acidic condition, comprising the steps of (1) adding waste liquid of pool water of a phosphogypsum stack into phosphogypsum slurry which is washed three times for slurry adjustment during the process of producing phosphoric acid by a wet method to obtain ore pulp at the concentration of pH 1.5-3; (2) properly adding a flotation collector i.e. ether amine salt and a foaming agent i.e. alkyl alcohol; obtaining gypsum concentrate with less than 3% of silica in flotation foam and tailings with rich silica and impurities in flotation bottom flow through the separation processes of one time of roughing, one time of scavenging and two to three times of fine flotation separation; processing the foam and the bottom flow by using a thickening system, a sedimenting system and a separating system to obtain selected gypsum products and byproducts with more silica. According to the method for removing the silicon from the phosphogypsum in the obverse floatation way under the acidic condition, as the floatability difference of the ether amine salt to the gypsum and the silica under a highly acidic condition is fully utilized, a new technology for removing the silica from the phosphogypsum in the obverse floatation way is obtained; the method has the advantages that the processing cost is low, the indexes of a floatation and separation technology are stable, the purity of the selected gypsum products is high, and the requirement on the recycling reutilization of the phosphogypsum can be met.

The invention relates to a method of recycling cyclohexanone waste lye. The method comprises the following steps: 1) acid is used for neutralizing waste lye to extract acid oil, anhydrous sodium sulphate and sodium sulphate with water; acidulated sewage is processed; 2) acidic sour gas is processed; 3) anhydrous sodium sulphate and sodium sulphate with water are used for cogeneration of sodium sulfide; 4) acid oil is used for cogeneration of monocarboxylie acid, adipate and fuel oil. The technical route is reasonable and has the advantages that waste lye is used for processing the sewage acidulated by sodium sulfate solution immediately after neutralization with acid to eliminate acidic sour gas, so as to radically treat secondary pollution of acid neutralization method, achieve zero emission and improve environmental benefits obviously; sodium sulfide, monocarboxylie acid, adipate, clean fuel oil and other chemical products with high added-value are obtained, so that economic benefits are obvious; The method recycles waste resource, has low energy consumption and simple technique, which is applicable to scale treatment of cyclohexanone waste lye as well as industrial production of resource recovery.

The invention provides an oil field oil pumping unit distributed grid connected type wind power generation complementary power supply system so as to reduce the power supply volume of the power grid and reduce the transmission loss of the power grid. The system comprises a wind power generating set (1), a conversion device (2), an electric energy metering device (3), a step-up transformer (4), a wind power generation control and protection system (5), a step-down transformer (6) and an oil pumping unit (7), and realizes synchronous power supply from the power grid and wind power to the load of the oil pumping unit. If the wind power is sufficient, the wind power not only can meet the load need, but also can feed electric energy back to the power grid; and in the case of lack of wind power, the power grid supplements the deficient electric energy so as to maximize utilization of wind energy and ensure that the oil pumping unit is always in a stable working state. In addition, the electric energy metering device (3) is arranged on the wind power generation side, and is used for performing accumulated metering on the wind power generation capacity so as to evaluate the energy saving effect of the wind power generation system. The entire system mainly utilizes wind energy, is convenient to use, and has a good energy saving effect.

Disclosed is a method for producing a high purity 2-hydroxy-3-naphthoic acid. The method includes a 2-naphthol measuring tank, a caustic soda liquid storage tank, a caustic soda liquid measuring tank, a salt forming reaction vessel, carbon dioxide, a carbonization kettle, a resin separation, a resin solid waste, a dilute sulfuric acid, a neutralization, a filter pressing, a filter cake distillation, a 8% sodium hydroxide, a resin adsorption, an acid eduction, a sewage treatment workshop, a centrifugal dewatering, a pneumatic drying and finishing of a high purity 2-hydroxy-3-naphthoic acid product. The caustic soda liquid storage tank is downwards connected to the caustic soda liquid measuring tank, the caustic soda liquid measuring tank is connected to the salt forming reaction vessel, the salt forming reaction vessel is downwards connected to the carbonization kettle, simultaneously the carbon dioxide is connected to the carbonization kettle, 2-naphthol generated by reaction in the carbonization kettle and 2-naphthol obtained by the filter cake distillation are connected to the 2-naphthol measuring tank, the carbonization kettle is downwards connected to the resin separation, and simultaneously the resin separation is upwards connected to an ethyl naphthol feed liquid and the dilute sulfuric acid and downwards connected to the neutralization and the resin solid waste. According to the method, the whole process is simple, the operation and the usage are convenient, the stability is good, and the reliability is high.

The invention provides an in-place regenerating activating furnace, system and method for saturated active carbon. The in-place regenerating activating furnace, system and method are used for in-place regeneration of saturated active carbon used in a sewage treatment plant. The regenerating activating furnace comprises a furnace body, a driving device, a riding wheel device and a combustion chamber, wherein at least one gas introduction pipe is connected into the furnace body, the outer end of the gas introduction pipe is connected with a gas source, and the gas source is used for supplying combustion-supporting gas; the combustion-supporting gas is introduced into the furnace body through the gas introduction pipe, so that the temperature in the furnace body is increased; energy of the rotary regeneration activating furnace is from natural gas, heavy oil or other oil products. Waste gas produced in the regeneration process is purified by a scrubber tower and then is exhausted through an induced draft fan. With the adoption of the regenerating activating furnace, regeneration of the adsorbed saturated active carbon in the sewage treatment plant can be realized, for indexes after regeneration, the iodine value is higher than or equal to 560 mg / g, methylene blue is higher than or equal to 70 mg / g, and the strength is higher than or equal to 85%; the regeneration yield is not lower than 90% of that of original active carbon. Compared with a traditional method, the method has the advantages that hazardous waste emission reduction, energy conservation and the like are realized, the operation cost of water treatment adopting an active carbon method can be effectively reduced, and good social and environmental benefits are achieved.

The invention discloses a biological retention system for rainwater purification and reuse. The biological retention system comprises a rainwater garden and a landscape fountain; the rainwater garden sequentially comprises a vegetation layer, a covering layer, a filler layer, a geotechnical cloth layer, a supporting layer and a drainage layer from top to bottom; plants are planted on the filler layer, and the filter layer comprises soil, river sand, turfy soil, zeolite, vermiculite and excess sludge of waterworks; a fountain basin of the landscape fountain is sequentially provided with a disinfection layer, a water storage layer and a fountain layer from bottom to top, and a settling tank is arranged at the bottom of the fountain basin; an ultraviolet modulator tube is arranged on the disinfection layer, and the disinfection layer is connected with the drainage layer; and an immersible pump in the water storage layer supplies water in the water storage layer into a fountain water pipe to be sprayed out on the fountain layer. According to the biological retention system, a good environment can be provided for growth of the plants, pollutants in runoff of the rainwater are effectively removed, the rainwater serves as water for the landscape fountain after being purified, water for urban landscapes can be supplemented, and the municipal drainage pressure is relieved.

The invention relates to a device for efficiently and comprehensively treating take-away waste and a using method thereof. The device is suitable for treating the take-away waste and comprises a machine frame, wherein a food residue-take-away meal box separating unit is arranged on the machine frame, and a plastic meal box outlet and a food residue flow outlet are formed in the food residue-take-away meal box separating unit; and the machine frame is provided with a plastic crushing and collecting unit, a food residue grinding, crushing and collecting unit, an automatic flushing unit, and a single-chip microcomputer control unit, wherein the plastic crushing and collecting unit is connected with the take-away meal box outlet, the food residue grinding, crushing and collecting unit is connected with the food residue flow outlet, the automatic flushing unit is used for flushing food residues and take-away meal box fragments. The device is compact in structure and can be conveniently usedfor treating the take-away waste in efficient, volume-reduction and resourceful classification modes.

The invention discloses a one-step production method of chlorinated polyethylene. The method comprises the following steps: adding 10-20 parts by mass of high-density polyethylene to 80-90 parts by mass of water to generate a chlorination in the presence of an emulgator, a dispersing agent, an initiator and chlorine gas, adding 5-7 parts by mass of calcium oxide in batches in the chlorination process, thus generating chlorinated polyethylene resin and an aqueous solution of calcium chloride, wherein the addition speed of calcium oxide has to ensure that the pH value of the reaction system is controlled to be between 7.0 and 8.5; centrifuging and drying the obtained chlorinated polyethylene resin to obtain a finished chlorinated polyethylene product; and concentrating and drying the aqueous solution of calcium chloride to obtain a byproduct calcium chloride. The one-step production method of chlorinated polyethylene has the advantages that the process flow is simplified, the space occupied by devices and investment in devices are reduced, and the production cost is lowered; in the preparation process of chlorinated polyethylene, waste acid water is made a full use and prepared into a byproduct, and therefore the clean production level is high and relatively high economic benefit can be created.

The invention relates to a cold-rolled acid wastewater resource and zero-emission method, which specifically comprises: (1) filtration pre-treatment: filtering cold-rolled acid washing wastewater as pre-treatment to filter out particles having a particle size of more than 5-30 [mu]m so as to obtain filtered acid washing wastewater; (2) membrane concentration: concentrating the filtered acid washing wastewater by using an efficient membrane concentration technology to obtain concentrated acid and pure water; and (3) acid regeneration: carrying out acid regeneration on the main components such as the acid and the Fe<2+> in the concentrated acid after the concentration with the membrane concentration process, the acid washing waste liquid and the like, wherein the acid generated during the acid regeneration process re-enters the acid washing system so as to be recycled, and the Fe<2+> finally form iron oxide red as the product for sale. According to the present invention, through the wastewater filtration, the membrane concentration and the acid regeneration, the resource recovery and utilizations of the acid and the water in the acid wastewater are respectively achieved, no sludge is generated, and the zero emission of the solid and the liquid is achieved.

The invention discloses building decoration waste derived fuel and a method for preparing the same. The building decoration waste derived fuel comprises, by weight, (50-75) wt% of organic light components, (0-30) wt% of pulverized coal, (0-30) wt% of river silt and (0-20) wt% of quicklime. Building decoration waste is sorted to obtain the organic light components, the organic light components are used as main raw materials for the building decoration waste derived fuel, and the pulverized coal, the river silt and the quicklime are used as additives and are added into the organic light components. The method includes proportionally mixing the organic light components from the building decoration waste, the pulverized coal, the river silt and the quicklime with one another to obtain mixtures; carrying out compression molding and processing on the mixtures to obtain the building decoration waste derived fuel. The building decoration waste derived fuel and the method have the advantages that a heat value of the building decoration waste derived fuel prepared by the aid of the method can reach (20000-25000) kJ / kg, the mechanical strength of the building decoration waste derived fuel can reach 90% at least, a chlorine element consolidation proportion can reach 78% at least, and the building decoration waste derived fuel can be used as environment-friendly regenerated fuel in the pyroelectricity industry to partially replace coal; the building decoration waste and the river silt which are two types of solid waste can be recycled, and a way with high additional values can be provided for utilizing the building decoration waste and the river silt.

The invention relates to a method for removing the total organic carbon in emulsification liquid biochemical effluent. According to the method, emulsification liquid biochemical effluent and ozone firstly enter the bottom portion catalyst layer of a double-layer efficient catalytic reaction tower, wherein the bottom portion catalyst layer is provided with a supported binary complexing molecular sieve catalyst for removing the total organic carbon in the biochemical effluent, and the supported binary complexing molecular sieve catalyst adopts alumina carrier as a carrier and has a specific surface area of 123-155 m<2> / g; the emulsification liquid biochemical effluent and the ozone then enter a top portion catalytic adsorbent layer, wherein the top portion catalytic adsorbent layer is provided with a supported manganese-based active carbon catalyst having an active carbon particle size of 1-3 mm and soaked with a manganese nitrate solution; and the emulsification liquid biochemical effluent is discharged through a water outlet, and gas is discharged through the gas outlet on the upper portion of the double-layer efficient catalytic reaction tower. With the technical scheme of the present invention, the environmental pollution can be reduced, and the increasingly stringent environmental protection laws and regulations can be positively replied.

The invention discloses a liquid seaweed bio-fungus and a preparation process thereof. The liquid seaweed bio-fungus is compounded by the marine bio-fungus and three microbial floras including actinomycetes, lactobacillus and saccharomycetes. The process comprises the following steps: sterilizing the seaweeds at high temperature (over 100 DEG C), soaking, grinding and rubbing the seaweeds to prepare seaweed starch; proportionally mixing the seaweed starch with molasses, various auxiliaries, water and cultured fungus solution, stirring and then fermenting; and finally packaging. The preparation process of the invention is simple and is characterized by low production cost, high concentration and high survival rate. The liquid seaweed bio-fungus prepared by the process has the characteristics of high activity, quick absorption, high economic benefits and good social and environmental benefits.

The invention relates to a novel large dip angle conveyer belt rapping type sweeper and a sweeping method. Currently, a large dip angle wavelike raised edge conveyer belt is used for a section 1 and asecond 2 of a peak-regulating heat source furnace supporting coal conveying system of a thermal power plant, and before transformation of the large dip angle wavelike raised edge conveyer belt, dustconcentration of a belt operation station exceeds a standard severely. A novel large dip angle conveyer belt rapping type sweeper is composed of a large dip angle conveyer belt (1), an electromagneticvibrator (2) and a driving roller (3), a rapping device main body (4) is mounted on a return belt of the driving roller, the rapping device main body is connected onto a conveyer belt rack (5) through four lead screws, the lead screws are connected with the rapping device main body through 8 rapping device damping springs (6), a rapping carrier roller (7) is mounted at a lower part of the rappingdevice main body, and three electromagnetic vibrators are mounted at an upper part of the rapping device main body. The novel large dip angle conveyer belt rapping type sweeper and the sweeping method, provided by the invention, are mainly applied to prevention of powder leakage and coal sticking for equipment and facilities of a fuel coal conveying system of a power generation enterprise.

The invention initiatively provides a technical scheme for removing total organic carbon and organic halides in biochemical effluents, and belongs to an environment-friendly manufacturing process system. A treatment system for simultaneously removing the total organic carbon and the organic halides in the biochemical effluents comprises a water inlet pump, a fixed-bed oxidation reaction tank, modified diatomaceous earth-ferrous sulfate fillers, a hydrogen peroxide dosing tank, a dosing pump, a lift pump, a modified activated carbon adsorption tower, modified activated carbon and a drainage pump. After the biochemical effluents are treated by the treatment process, the pH of the biochemical effluents ranges from 6 to 8.5, the content of the total organic carbon ranges from 3.5mg / L to 13.2mg / L, and the content of the organic halides ranges from 0.1mg / L and 0.4mg / L.

A device and a method for absorbing tail gas in air bromine blowing production are used in air bromine blowing production. Two stages of alkali washing absorption towers are arranged, a liquid causticsoda absorption liquid automatically flows to the absorption towers from a high-level buffer tank by utilizing a liquid level difference and is sprayed, and the absorbed liquid alkali enters a liquidcaustic soda circulating tank and then is pumped to a top buffer tank in order to realize circulating absorption. The pipe diameter of the liquid caustic soda circulating pipeline is larger than that of a liquid caustic soda spraying pipeline, so that the amount of circulating liquid caustic soda in a buffer tank is larger than the self-flow, sufficient liquid alkali in the buffer tank is guaranteed, and the liquid caustic soda overflows back to the circulating tank through a bypass overflow port after being fully stored. By utilizing the liquid level difference, the alkali washing absorption towers are still kept in a normal running state after power failure, the problem that a large amount of tail gas is emptied to pollute air due to the fact that an emergency power failure circulatingpump stops running before transformation can be avoided, and meanwhile part of product losses can be avoided.

The invention discloses a high-efficiency integrated treatment process for landfill leachate membrane concentrate, which combines (1) bio-enzyme oxidation, (2) short-cut nitrification and denitrification, (3) multi-phase metal chemical catalysis and (4) free radical oxidation processes, and applies an enzyme pre-oxidation reactor, a short-cut denitrification device, a magnetoacoustic catalytic reactor and a catalytic oxidation reactor for the process provided by the invention. A vertical flow type sedimentation tank and a microwave ultrasonic reaction device are adopted for implementation; the treated effluent reaches the discharge standards required by the table 2 and the table 3 of the Pollution Control Standard for the Landfill Site of Municipal Solid Waste (GB16889-2008); the method is a full-quantitative treatment process in a real sense, and thorough degradation and removal of pollutants are realized.

The invention discloses a static crushing construction method. The static crushing construction method comprises the following steps that 1, construction preparation is conducted, specifically, 1, the absolute elevation and the relative elevation of the flat foundation depth are determined, and an elevation control net map and a plane control net are drawn; 2, relevant quality acceptance specifications and safety measures are familiar, and especially safety and environmental protection measures are adopted; and 3, reconnaissance and site familiarity are conducted, underground obstacles, unfavorable geological conditions and the like are determined in combination with underground pipeline data, geological exploration data and the like provided by a construction party, and meanwhile the whole site flatness degree meets the requirement of mechanized equipment entrance. The static hydraulic crushing construction method adopts the processes of surface soil cleaning, hole arrangement design, measurement positioning, drilling and splitting rod inserting, rock splitting through pressurization, large rock crushing, loading and outward transporting of rock and the like. By using the static crushing construction method, the embarrassed situation that effective construction cannot be conducted due to the hard geological conditions is solved, and meanwhile good social and environmental protection benefits are achieved due to low noise and little flying dust.

The invention relates to a method for advanced treatment of chemical waste water through SKL three-phase catalytic oxidation and BAF. The method comprises: leading waste water into an SKL three-phase catalytic oxidation reactor for reaction; leading the obtained water into an adjusting stabilization pond; leading the obtained water into a biological aerated filter; and finally leading the obtained water out. Chemical waste water subjected to "physicochemical and biochemical" secondary treatment is pumped into the SKL three-phase catalytic oxidation reactor. The waste water subjected to magnetization pre-treatment reacts with a solid-phase catalyst SKL-A and an oxidant for a catalytic oxidation reaction, and an ultrasonic effect is adopted during the reaction process. Pollutants hard to degrade in the chemical waste water are subjected to chain scission and ring opening, the water content is further regulated for reaction improvement, and the obtained water is led into the biological aerated filter for biochemical treatment. Defects of a limited processing load, high operation cost, large investment, and little project experience in a conventional method are overcome. Through adoption of magnetization pre-treatment in the method, the chemical reaction speed and reaction degree are significantly increased; loss of the solid-phase catalyst and the application amount of the oxidant are reduced; and the operation cost is greatly reduced.

The invention discloses an integrated tower for dust removal, desulfurization and denitrification in the field of flue gas desulfurization and denitrification. The integrated tower comprises a tower body and a tower cover, wherein the center of the bottom end of the tower body is provided with a first connection screw hole, the inner wall of the tower body is fixedly provided with a first partition plate, a second partition plate, and a third partition plate in order from bottom to top, the bottom of the side wall of the tower body is provided with an opening, the opening is sealed by a sealing plug, the inside of the first connection screw hole is in threaded connection with a first one-way valve, the end of the first one-way valve is connected with a flue gas pipe, the top end of the first partition plate is evenly provided with ventilation holes, the center of the second partition plate is provided with a through hole, the center of the top end of the second partition plate is fixedly equipped with a SCR reactor, the SCR reactor communicates with the through hole, the center of the top end of the SCR reactor is provided with an air outlet pipe, the center of the top end of the third partition plate is provided with a second connection screw hole, a liquid cylinder is placed at the top end of the third partition plate, the center of the bottom end of the liquid cylinder is provided with a penetration hole, the inside of the penetration hole is equipped with a second one-way valve, the side wall of the second one-way valve is in threaded connection with the second connection screw hole, and the center of the top end of the tower cover is provided with an air outlet.

The invention belongs to the technical field of environmental protection, and relates to a method for repairing a heavy metal polluted farmland. According to the method, the phytoremediation technology and the chemical remediation technology are combined, and the technology and economic feasibility are improved through advantage complementation. Oasis No.1 fungus grass is planted in a farmland, wherein a passivating agent is applied in the early stage of growth of the Oasis No.1 fungus grass, absorption of the Oasis No.1 fungus grass to heavy metal is reduced, and tender grass is harvested for feed; besides, a surfactant and a plant growth regulator are applied in the later growth period of the Oasis No.1 fungus grass, so that the Oasis No.1 fungus grass is promoted to absorb heavy metals, meanwhile, the yield is increased, and old grass is harvested for building materials. Compared with the prior art, the repairing method can realize repairing while production, and has better technical and economic feasibility.

The invention belongs to the technical field of road board processing, and provides a pavement brick for reducing air dust and a preparing method. The pavement brick for reducing the air dust is prepared from titanium dioxide, a water reducing agent, modified attapulgite, flyash and a pore-forming agent. According to the pavement brick for reducing the air dust and the preparing method, the formula of existing pavement bricks is adjusted and added with the titanium dioxide and the modified attapulgite, the adsorbability of the pavement bricks is improved, the particulate matter on road surfaces can be adsorbed, the dust raised in the air environment is reduced, and accordingly the raised dust pollution is reduced.

The invention discloses a dust removal, desulfurization and denitrification integrated tower in the field of flue gas desulfurization and denitrification, comprising a tower body and a tower cover, a first connecting screw hole is opened in the center of the bottom end of the tower body, and the inner wall of the tower is fixedly arranged sequentially from bottom to top. For the first partition, the second partition and the third partition, there is an opening at the bottom of the side wall of the tower body, and the opening is closed by a sealing plug. The first connecting screw hole is internally threaded with a first one-way valve. The flue gas pipe is connected to the end of the valve, the top of the first partition is evenly opened with ventilation holes, the center of the second partition is provided with a through hole, the center of the top of the second partition is fixedly installed with the SCR reactor, the SCR reactor and the through hole The top center of the SCR reactor is provided with an outlet pipe, the center of the top of the third partition is provided with a second connecting screw hole, the top of the third partition is placed with a liquid cylinder, and the center of the bottom of the liquid cylinder is provided with a through hole, and the through hole is installed There is a second one-way valve, the side wall of the second one-way valve is threadedly matched with the second connecting screw hole, and an air outlet is opened in the center of the top of the tower cover.

The invention provides a process system for simultaneously removing soluble organic carbon and total chromium in cold-rolling reverse osmosis concentrated water. The process system comprises a water inlet pump, a primary inclined plate sedimentation tank, a montmorillonite dosing tank and dosing pump, a montmorillonite-loaded iron-based reducing agent, a lifting pump, a modified activated carbon dosing box and dosing pump, a modified activated carbon coagulant, a secondary inclined plate sedimentation tank and a drainage pump. The invention further provides a method for treating the cold-rolling reverse osmosis concentrated water by using the process system. Through the addition of the montmorillonite-loaded iron-based reducing agent and the modified activated carbon adsorbent, the overallprocess is optimized, and a good effect is achieved. The invention provides the complete technical scheme of deep treatment of the cold-rolling reverse osmosis concentrated water for the first time,and the problem that the cold-rolling reverse osmosis concentrated water pollutes the environment is solved, so that the process system belongs to a green environment-friendly production process system of steel.

The invention discloses a remodeling material and method for a water-repellent layer of a dumping site in an open pit mine, and is applicable to the field of coal mining water resource protection. Theremodeling material is a mudstone polymer which comprises water, a gel material, an activator and standard sand. The method comprises the following steps: determining the ratio of materials for the remodeling water-repellent layer according to actual conditions; compacting the surface of the dumping site, constructing a mould, uniformly pouring the remodeling material, vibrating and smoothing; curing for a period of time to complete the remolding of the water-repellent layer at the stage, and circulating the process to remodel the whole water-repellent layer. The remodeling material for the water-repellent layer of the dumping site in the open pit mine disclosed by the invention is simple in construction and low in cost, can be used for remodeling the water-repellent layer of the dumpingsite in the open-pit mine and realizing ecological reclamation, and is of great significance for constructing green mining of mines.

The invention discloses a one-step production method of chlorinated polyethylene. The method comprises the following steps: adding 10-20 parts by mass of high-density polyethylene to 80-90 parts by mass of water to generate a chlorination in the presence of an emulgator, a dispersing agent, an initiator and chlorine gas, adding 5-7 parts by mass of calcium oxide in batches in the chlorination process, thus generating chlorinated polyethylene resin and an aqueous solution of calcium chloride, wherein the addition speed of calcium oxide has to ensure that the pH value of the reaction system is controlled to be between 7.0 and 8.5; centrifuging and drying the obtained chlorinated polyethylene resin to obtain a finished chlorinated polyethylene product; and concentrating and drying the aqueous solution of calcium chloride to obtain a byproduct calcium chloride. The one-step production method of chlorinated polyethylene has the advantages that the process flow is simplified, the space occupied by devices and investment in devices are reduced, and the production cost is lowered; in the preparation process of chlorinated polyethylene, waste acid water is made a full use and prepared into a byproduct, and therefore the clean production level is high and relatively high economic benefit can be created.

The invention relates to the technical field of water treatment, and discloses a method for removing COD (chemical oxygen demand), ammonia nitrogen and suspended solids in rainwater, which comprises a water inlet pump, a multi-layer filter and a drainage pump, and the output end of the water inlet pump is connected with the input end of the multi-layer filter through a pipeline; the output end of the multi-layer filter is connected with the input end of the drainage pump through a pipeline, and the interior of the multi-layer filter is sequentially filled with a gravel layer, a modified iron slag layer, a modified attapulgite soil layer and a quartz sand layer from bottom to top; the method specifically comprises the following steps that rainwater enters the multi-layer filter through the water inlet pump; sequentially passing through a gravel layer, a modified iron slag layer, a modified attapulgite soil layer and a quartz sand layer; and finally, the rainwater treated by the multi-layer filter is pumped into an industrial water system of a steel mill through a drainage pump. The invention discloses a method for removing COD (Chemical Oxygen Demand), ammonia nitrogen and suspended matters in rainwater, which realizes the purpose of industrial reutilization of rainwater and belongs to a green low-carbon production process.

The invention discloses a construction method for downwards penetrating a freight railway special line by using a shield tunneling machine, and relates to the technical field of line construction. The method comprises the following steps that safety assessment is carried out on existing railway operation, corresponding settlement indexes are formulated, a downward penetrating construction scheme is determined, and a basic route scheme is formulated according to geological conditions. According to the construction method, serious influence on normal operation of a railway is avoided, the upheaval and subsidence of the railway and the earth surface are within an allowable range in construction, the safety of the railway, roads, pipelines and buildings is ensured, and environmental harm is avoided. The success of safely penetrating the trunk railway in a short distance provides specific guidance and reference for various projects of shield downward penetrating railways and important buildings, and provides reliable decision basis and technical indexes for planning and construction of urban underground projects under similar conditions in the future, the novel construction method technology promotes the progress of the underground project construction technology, and social benefits and environmental benefits are obvious.