390 results about "Environmental Engineering technology" patented technology

The invention belongs to the technical field of environmental engineering, and particularly relates to a process for preparing a sludge autoclaved aerated concrete building block. The process mainly comprises the following steps of: (1) quickly stirring and mixing spare dried sludge, water and lime, coal ash, cement, gypsum and aluminum powder with physical and chemical properties meeting the brick making requirements in a certain ratio and in turn; (2) feeding the mixture obtained in the step (1) into a die, and putting the die into a thermostatic curing box of 40 DEG C or 60 DEG C to perform foaming and curing for 4 hours; (3) putting the blank foamed and cured in the step (2) into an autoclave, and curing the blank for over 8 hours by adopting a stepwise buck-boost curing mode; and (4) piling the product discharged from the autoclave outdoors for over 2 days. The process can reach hazard-free and recycling treatment of urban sludge, save clay resources and save the brick making cost, and has remarkable economic, social and environmental benefits.

The invention provides an onsite processing process for discarding initial rainwater in a heavy rain without occupying area, belonging to the technical field of environmental engineering. The invention discloses an onsite processing device for the discarding initial rainwater in the heavy rain without occupying area, which comprises a water inlet mechanism, a soil covering layer, a mixed layer, a soil layer, a gravel layer, a fine sand layer, a foundation layer and a draining mechanism, wherein the soil covering layer, the mixed layer, the soil layer, the gravel layer, the fine sand layer and the foundation layer are arranged in sequence from top to bottom; and the water inlet mechanism is connected with the mixed layer; and the draining mechanism is connected with the gravel layer and the fine sand layer. By the invention, the discarded initial rainwater in the heavy rain can reach the grade I discharge standard of the Discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002) and GB/T 18920-2002 reuse of recycling water for urban and water quality standard for urban miscellaneous water consumption, and the blockage problem of the groove processing system can be effectively prevented.

The present invention discloses a lake-reservoir cyanobacteria water bloom recognition method based on remote sensing monitoring and evidence fusion technology improvement, and belongs to the technical field of environmental projects. The method comprises: establishing a remote sensing inversion model, determining cyanobacteria water bloom breaking-out degree recognition indexes, pre-treating monitoring data, assigning belief function values, and recognizing monitoring area cyanobacteria water bloom. According to the present invention, an ensemble learning Bagging algorithm is fused into regression analysis of the remote sensing inversion model (ie., the normalization vegetation index model) to correct parameters of the model to obtain the corrected remote sensing inversion model so as to improve fitting accuracy; the problem of selection of indexes for lake-reservoir cyanobacteria water bloom recognition and value ranges thereof is solved; the problems of selection of the monitoring area and pretreatment of the monitoring data are solved; the problem of assignment of the belief function values is solved; and effective cyanobacterial water bloom recognition is achieved.

The invention discloses a chromium-contaminated soil remediation method, belonging to the technical field of environment engineering. The method comprises the following steps of: dissolving out hexavalent chromium in the chromium-contaminated soil, separating the soil from water, treating trivalent chromium-contaminated soil, treating hexavalent chromium sewage and treating filter residue; the dissolution efficiency of the hexavalent chromium in the chromium-contaminated soil can be improved by the KH2PO4 solution; the trivalent chromium-contaminated soil is treated by biochar made of municipal sludge, so that waste reclamation and secondary utilization of the contaminated soil can be realized; Na2S2O5 can be added into the hexavalent chromium sewage and is used for adjusting the reaction environment, so that the efficiency of converting hexavalent chromium into trivalent chromium can be improved; a flocculating agent is used for accelerating the precipitation and concentration of the trivalent chromium; the filtered water can be used as flushing water for recycling, so that the method is economical and environment-friendly; and a curing stabilization method is used for treating the filter residue, so that the chromium in the filter residue is passivated, and the national environmental standard requirements can be reached. According to the method, the hexavalent chromium and the trivalent chromium are respectively treated, and the solid and the solution are respectively treated, so that the treatment efficiency is improved, the treatment effect is guaranteed, and the method has the characteristics of being free from secondary pollution, low in cost, high in resource utilization rate, etc.

The invention relates to a process method for preparing a catalyst by using electrolysis waste water and electrolysis sludge, and belongs to the technical field of waste recycling and environmental engineering. The process method comprises the following process steps: mixing, stirring, settling, separating solid from liquid, drying, calcining and the like. Through the coordinated treatment of electrolysis waste water and sludge, which are industrial wastes, and industrial CO2, the use of the process method has a great significance for the treatment of electrolysis waste water and the emission reduction and capture of green house gases, fully utilizes wastes and fulfils the aim of recycling; and a catalyst can be obtained, the environment pollution can be relieved, and the aim of treating waste with waste is fulfilled.

The invention belongs to the technical field of environment engineering and discloses polyvinyl alcohol immobilized microorganism gel beads and a preparation method and use thereof. The preparation method comprises adding polyvinyl alcohol and sodium alginate into water, carrying out stirring dissolution to obtain a uniform mixed gel liquid, mixing a microbe condensed suspension and the mixed gel liquid to obtain a mixed bacterial liquid, dropwisely adding the mixed bacterial liquid into a calcium chloride-containing saturated boric acid solution along with stirring, then carrying out a full crosslinking process at a temperature of 0-10 DEG C and washing the beads by distilled water so that the polyvinyl alcohol immobilized microorganism gel beads are obtained. The polyvinyl alcohol immobilized microorganism gel beads have high mechanical properties, good mass transfer performances, long biological activity lasting time and a good application prospect in the field of sewage treatment.

A reclaimed water deep denitrification and dephosphorization method based on low C/N ratio belongs to the technical field of environmental engineering. A process for composing solid cellulose carbon-sourced ferrous sulfide by coupling sulfur and sponge iron composite through alkali-treated corncobs is simplified as SCSC-S-Fe process. An SCSC-S-Fe process system relies mainly on heterotrophic denitrification to remove nitrogen in water in coordination with sulfur autotrophic denitrification and sponge iron denitrification; in this system, mainly sulfur and sponge iron are chemically reacted to generate FeS, FeS combines with other products generated by sponge iron corrosion such as Fe2+, Fe3+, F36(OH)12(CO3) and FeOOH to convert PO43- into Fe3(PO4)2.xH2O, FePO4 and Fe3(PO4)2(OH)2 precipitates by adsorption precipitation, thus removing phosphorus; the SCSC-S-Fe process is effective in improving reclaimed water deep denitrification and dephosphorization effect at low C/N ratio. The method has a promising application prospect in high-quality reclaimed water treatment.

The invention relates to a melting treatment method for waste incineration flying ash, and belongs to the technical field of environmental engineering. The treatment method comprises the following steps of carrying out pretreatment on the waste incineration flying ash to form treated flying ash; uniformly mixing the treated flying ash with sludge to form a mixture of the flying ash and the sludge; carrying out solidification and stabilization on the mixture of the flying ash and the sludge to form a solidified body; and carrying out melting treatment on the solidified body. The treatment method can effectively solve the problems that the caloric value in the flying ash is relatively low, and heavy metals in the flying ash are liable to volatilize, so that pipeline blockage in a flying ash conveying process is avoided; and the melting treatment method is good in treatment effect, is low in cost, is free from secondary pollution, and is high in resource utilization.

A rotary tubular dynamic membrane bioreactor adopting nonwovens and a sewage treatment method thereof belong to the technical field of environmental engineering. The invention is characterized in that tubular filter modules are manufactured by wrapping up the hollow tubes with holes on the walls by the nonwovens; an electric motor is used for driving the tubular filter modules fixed on discs to rotate; and under the action of a suction pump, the treating water enters into the hollow inside of the tubular filter modules, is collected to a main collector tube by radial collector tubes on the discs and then is discharged. By adopting the nonwovens to manufacture the filter modules, the bioreactor has low cost; the dynamic membranes on the surfaces of the nonwovens are used for improving the filtration precision; and the rotating speed is regulated according to variation of the operation pressure, thus effectively maintaining proper thickness of the dynamic membranes and ensuring permanent and stable running of the reactor. The invention has the benefits of adopting the microporous aerator with high oxygen utilization efficiency and reducing energy consumption. The tubular filter modules can be dismantled independently and are simple and convenient to operate.

The invention relates to application of an immobilized quinone compound in accelerating the denitrification process of a microorganism, belonging to the technical field of chemical engineering, biological engineering and environmental engineering. The immobilized quinone compound is 1,8-dichloroanthraquinone and 1,5-dichloroanthraquinone or 1,4,5,8-tetrachloroanthraquinone. The immobilized quinone compound can intensify, regulate and control the denitrification process of an organism, accelerate the velocity and the capacity of the microorganism on the denitrification process of nitrogenous substances, effectively reduce the cost of water treatment and has the advantages of good stability, loss difficulty and reduced secondary pollution, low price of immobilized raw material sodium alginate, good biocompatibility, simple fixing process and low production cost and is easy to realize redox mediator recovery, regeneration and recycling.

The invention relates to a method for solidifying and stabilizing sludge from an urban sewage treatment plant, belonging to the technical field of environmental engineering. The method comprises the following steps: under room temperature conditions, evenly mixing industrial residue and silicate cement according to a certain ratio; and adding the mixture used as sludge solidifying and stabilizing agent and sludge into a stirrer, evenly stirring, and then curing for 3-7 days to ensure that the water content and strength of the sludge meet the requirements of soil for landfill and construction. According to the invention, the industrial residue is used for solidifying the sludge, and the unique advantage of the industrial residue is fully utilized, so that the solidified sludge can achieve better technical indices, the treatment of wastes with processes of wastes against one another is achieved, and the pollution problem and treatment cost caused by the industrial residue and sludge are greatly reduced, thereby realizing the recycling of wastes.

A sphingomonas xenophaga QYY (CGMCC No.1172) is disclosed, which features that the bromamino acid as the intermediate of anthraquinone dye is the unique carbon and nitrogen sources for its growth, so its cells can destroy the anthraquinone rings. As a result, it has strong decolor capacity and can be used to decolor the sewage of anthraquinone dye.

The invention belongs to the technical field of biological engineering and environmental engineering and discloses a low-temperature aerobic denitrifying strain Pseudomonas psychrophila Den-03. The strain is suitable for growing in a neutral culture medium at the pH (potential of hydrogen) of 7.2 and at the temperature of 10 DEG C, and is characterized in that the strain is atrichous, aerobic and capable of achieving denitrification, has yellowish-white cells and can grow with nitrate nitrogen serving as energy, and both catalase and oxidase are positive. The strain obtained by screening solves the problems of low production efficiency, low denitrification efficiency in winter and the like during sewage treatment of northern cold cities, removal rate of TN (total nitrogen) in low-temperature domestic sewage reaches 74%, and on the premise of guaranteeing stable denitrification efficiency, denitrification rate of urban sewage treatment systems in winter is increased, production efficiency is improved, production energy consumption is reduced, and the stain is of great significance to realization of short-range synchronous nitrification and denitrification.

The invention provides a biological nitrogen removing method of A/O/A branched direct flow for treating coking wastewater, belonging to the technical field of environmental engineering. The biological nitrogen removing method mainly comprises: the pretreated coking wastewater entering a preposed anaerobic filter tank and proportionally distributing the water outlet by a water distributor, wherein a large amount of water enters an aeration tank for aerobic treatment and a little of water enters a carbon source supplementary dispenser for dispensing treatment, after filtering the water entering the aeration tank by a filter membrane assembly arranged in the aeration tank, pumping out the aerobic-treated water to enter an anoxybiotic filter tank, simultaneously receiving the little water from the water distributor by a carbon source dispenser and additionally dispensing and modifying depending on the carbon-nitrogen condition, wherein the little water is merged with the discharged water which is aerobic-treated in the aeration tank to enter the anoxybiotic filter tank for nitrogen removing treatment by denitrification. Compared with the prior art, the invention has the advantages of simplified operation, reduced cost and largely reduced floor space and energy consumption.

The invention relates to a municipal excess sludge biologic drying organic conditioning agent and a preparation method thereof, and belongs to the technical field of environment engineering. Cellulose fermenting rest waste fungi residues and furfural residues are used as main substrates; after baking and carbonization, polysporus trichoderma conidial powder, iron powder and the like are added; through compounding and briquetting, the materials are prepared into the organic conditioning agents for rest sludge biologic drying. The organic conditioning agent has the beneficial effects of obviously promoting the starting of the sludge biologic drying process, improving the degradation efficiency of partial contaminants in sludge, passivating heavy metal and the like. The prepared organic conditioning agent can be used in the field of municipal excess sludge treatment and disposal.

The method of eliminating heavy metals from garbage burning flyash belongs to the field of environment engineering technology. Aspergillus niger, which can bear heavy metals, grow well under the substrate condition of liquid culture medium and flyash and produce organic acid through aerobic fermentation to leach out heavy metals from flyash, is used to eliminate heavy metals from garbage burning flyash. The technological process includes enlarging culturing Aspergillus niger to prepare suspension, inoculating the suspension in 1-10 vol% to culture liquid and adding the culture liquid in 2-10 vol% to flyash, and aerobic fermentation at 25-35 deg.c in constant temperature and vibrating condition for 15-25 days. The method of the present invention is simple, effective, low in cost, safe and environment friendly.

Belonging to the technical field of environmental engineering, the invention discloses a river-lake silt deep dehydrant. The river-lake silt deep dehydrant comprises an organic polymeric flocculant, an inorganic polymeric flocculant and an assistant agent. The organic polymeric flocculant includes: cationic polyacrylamide with a molecular weight of 8-12million and animal glue. The inorganic polymeric flocculant includes: polymeric ferric sulfate and polymeric aluminum sulfate. The assistant agent includes: straw powder, fly ash, quick lime and talcum powder. The river-lake silt deep dehydrant and the dehydration method provided by the invention realize deep and efficient dehydration.

The invention relates to a pulsed electric field dry type calcium-spraying flue gas desulfurization method and a device, which belong to the technical field of environmental engineering. In the method, Ca(OH)2 is used as a desulphurizer, is sprayed into a flue gas conveying pipe (in front of the second level dust collector) behind the first level dust collector at a high speed in a spraying unit and is mixed with the flue gas containing SO2; under the action of a high pressure pulsed electric field applied in the flue gas conveying pipe, the Ca(OH)2 reacts with the SO2 in the flue gas to generate CaSO3 and small amount of CaSO4 particulate matters; and then the CaSO3 and the CaSO4 particulate matters are removed by the second level dust collector so as to achieve the aim of removing the SO2 from the flue gas. The pulsed electric field dry type calcium-spraying flue gas desulfurization system in the conveying pipe is helpful to clean out superfine dust (PM10, the grain size is less than or equal to 10mu m). The high pressure pulsed electric field applied in the flue gas conveying pipe plays a role of predischarging the superfine dust and is advantageous for the purification through the second level electrostatic dust collector, thus the dust purifying efficiency is improved.

The invention relates to combined treatment device and process for acid-washing wastewater of stainless steel, and belongs to the technical field of environment engineering, and solves the problem of environmental pollution and resource waste. The device comprises a wastewater pond, a filter connected with the wastewater pond, a primary cation exchanger connected with the filter, a secondary cation exchanger connected with the primary cation exchanger, a safety filter connected with the secondary cation exchanger and a reverse osmosis device connected with the safety filter. The first and second cation exchangers are provided with regenerated acid liquor adding ports. The device further comprises a heavy metal gas remover connected with the first and second cation exchangers. The heavy metal gas remover is provided with a settling agent adding port. A circulating pipeline for transporting filtered water in the heavy metal gas remover to the wastewater pond is arranged between the heavy metal gas remover and the wastewater pond. Wastewater meets the standard and is discharged, and wastes are recycled, so that the resources are greatly saved.