87results about How to "Solve disposal problems" patented technology

The invention relates to the technical field of harmlessness treatment of smelting wastes, and especially relates to a ceramsite prepared by using smelting wastes, and a preparation method thereof. The ceramsite comprises 10-90% of smelting waste powder, 5-40% of municipal sludge, 4-20% of fly ash, 0-20% of gangue and 0.1-10% of a curing agent. The preparation method of the ceramsite comprises the following steps: 1, crushing the smelting wastes by using a crusher to prepare the smelting waste powder; 2, weighing the smelting waste powder, the municipal sludge, the fly ash, gangue and the curing agent, mixing, and uniformly stirring to prepare ceramsite powder; 3, conveying the ceramsite powder to a ball forming granulation machine, and carrying out granulation molding to prepare ceramsite balls; 4, drying the ceramsite balls; and 5, calcining he dried ceramsite balls to prepare the finished ceramsite. The ceramsite prepared in the invention has the advantages of light weight, environmental protection and wide uses; and the preparation method recycles the smelting wastes, and has good economic and social benefits.

The invention belongs to the field of treatment and disposal of industrial waste salt, and particularly discloses a harmless treatment method of industrial waste salt containing organic matter. The harmless treatment method comprises the steps that firstly, the waste salt is dried to remove water and the low-boiling-point organic matter in the waste salt, the dried salt is crushed and sieved to the required particle size, and then fed into pyrolysis equipment, the organic matter in the salt is heated to be decomposed into a gas phase, the organic matter and fine salt particles are together discharged into a cyclone separator along with airflow, the particles and gas are separated to recover salt powder, and organic exhaust gas enters an exhaust gas treatment device to be treated and then discharged after reaching the standard. The water and the organic matter in the waste salt are fully removed through drying, crushing, sieving and fluidized bed pyrolysis technologies, the organic exhaust gas generated in the treatment process is subjected to standard treatment, finally, dry salt powder which is low in impurity content and meets product quality requirements is obtained, and can befurther recycled.

The invention discloses a solidification treatment method for sludge of urban sewage plants. The method comprises the following steps of (1) adding curing agent consisting of lime, sulfate aluminum cement, portland cement and fly ash in dehydrated sludge based on the weight of the dehydrated sludge, wherein the weight percentage of lime, sulfate aluminum cement, portland cement and fly ash in the curing agent are as follows: 1.2-1.9% of lime, 3.0-6.1% of sulfate aluminum cement, 3.0-3.7% of portland cement and 4.7-6.0% of fly ash; and (2) mixing the sludge added with the curing agent to form precursors of solidified blocks, piling the precursors up according to a height of 7 cm, and covering with waterproof membrane, maintaining the precursors for three days with a dry maintaining method, and forming sludge solidified blocks. The method provided by the invention has the advantages of efficiency, low cost, simple operation and the like.

The invention discloses a process method and a process system for preparing solid fuel through biomass and sludge. The method comprises the step of mixing biomass dried raw materials with sludge dried raw materials which are aired, ground and dried to obtain the solid fuel, wherein sludge airing energy is one or the combination of any two or three of solar energy, waste gas generated by drying sludge raw materials and high-temperature fume generated by combusting the solid fuel, and sludge raw material drying energy is high-temperature and high-pressure steam generated by combusting the solid fuel. The system comprises a raw material treatment system, a molding system and a boiler system, wherein the raw material treatment system and the boiler system transfer heat energy to each other through first, second and third gas delivery pipelines. According to the method, the cost is low, the effect is good, environmental protection is realized and the solid fuel is suitable for large-scale production. The system is resource-saving and stable to operate.

The invention provides a preparation method of a sludge straw biomass fuel, which comprises the following steps: firstly mixing the excess sludge with the moisture content more than 96% from a municipal wastewater treatment plant with particle coal with the particle size of 0.15-0.18mm based on the mass ratio of 1:1-2; then filtering and dehydrating to obtain dewatered sludge with the moisture content of 40-60%; smashing the crop straws into crop powers to mix with the dewatered sludge based on the mass ratio of 1-10:90-99; and prilling and molding by a comminutor to prepare the sludge straw biomass fuel. The fuel can be used as an alternative fuel of the coal to directly be burnt for heat supply, is free of black smoke in the burning process, and can be applied in boilers or daily life cookware. The invention sufficiently utilizes the higher calorific value of the municipal sludge and the crop straws, realizes resource utilization of the fuel, and solves the treatment problem of the excess sludge from the municipal wastewater treatment plant and the crop straws.

The invention discloses a method for preparing solid forming fuel with pig manure as raw material. The method comprises the steps as follows: firstly, drying the pig manure to enable the moisture content of the pig manure to be reduced to 10%-25%, then crushing the pig manure and adding the additive capable of desulfuration, deodorization and mold prevention via 2%-5% dry basis quality of the pig manure so as to form the dried pig manure raw material; uniformly mixing and stirring 20%-100% of the dried pig manure raw material, 0%-80% of biomass and 0%-20% of coal by dry weight to obtain the raw material mixture, and then utilizing forming machine to perform hot-pressing formation, so as to obtain the solid forming fuel. The method has the characteristics of simplicity, convenience, feasibility, energy conservation and environmental protection, high treatment efficiency, low production cost, and high convenience for large-scale industrialized production, and the solid forming fuel has no odor, is not easy to mildew, is convenient in transportation and storage and high in combustion efficiency and has fewer secondary pollutant emissions. Therefore, harmless treatment and resource utilization of the pig manure are realized, and the problem about treatment and disposal of the excessive pig manure can be effectively solved.

The invention relates to a desulfurization wastewater zero discharge device. In the prior art, desulfurization wastewater is discharged after being purified. The desulfurization wastewater zero discharge device provided by the invention consists of a desulfurization system, a two-section wastewater cyclone, an ultrasonic atomization nozzle, a dust remover, a wastewater pump and a wastewater delivery pump, wherein the two-section wastewater cyclone comprises a cyclone body, an overflow pipe and a filtering net; an inlet and an underflow orifice of the cyclone are connected with the desulfurization system; an overflow port is connected with the ultrasonic atomization nozzle; an inlet flue is arranged on the dust remover; the ultrasonic atomization nozzle is communicated with the inlet flue on the dust remover; the dust remover is connected with the desulfurization system. The desulfurization wastewater zero discharge device disclosed by the invention is reasonable in structural design, wastewater drainage is avoided, water resources are saved, the space and cost are also saved, and inorganic salt ions and heavy metal ions in the wastewater can be effectively removed.

The invention discloses a method for simultaneously recovering phosphorus in a water body and removing antibiotics based on sludge-based biochar, and belongs to the field of sludge resource utilization and the field of compound polluted water body purification. The method comprises the following steps: (1) taking sludge generated in a sewage treatment process as a main raw material, and preparing sludge-based biochar through the steps of anoxic pyrolysis, drying, grinding and the like; (2) adding the sludge-based biochar obtained in the step (1) into a phosphorus and antibiotic combined polluted water body, then adding an oxidizing agent, transferring and enriching phosphorus in the water body to the surface of the sludge-based biochar through an adsorption effect, and removing antibiotics from the water body through a catalytic oxidation reaction; and (3) carrying out solid-liquid separation on the suspension obtained in the step (2) to complete purification treatment on the phosphorus and antibiotic combined pollution water body and obtain the sludge-based biochar which is rich in phosphorus and free of antibiotic pollution. The method has a wide application prospect in the fields of sludge resource utilization and combined polluted water body purification.

The invention discloses a production method of a sludge biomass mixed fuel. The production method comprises the steps that multi-stage continuous dewatering and drying are carried out, wherein water absorption of sludge with a high water content is directly carried out by using biomass wood dust, the action of microorganisms in the sludge is fully utilized, the types and the use amount of additives are reduced, the drying efficiency is improved, and the energy consumption is reduced; meanwhile, the sludge is turned into fuel, the emission of SO2 in a combustion process of a solid fuel is reduced, secondary pollution is reduced, no fermentation is needed, the prepared sludge biomass mixed fuel is easy to combust, the heat value of the solid fuel is obviously improved, and the combustion efficiency is improved; the temperature of a combustion zone is higher than 1200 DEG C, so that the fuel can be used to industrial grate-fired kilns and civilian heating. The ash after combustion is richin elements such as calcium, magnesium, phosphorus, potassium, sodium and the like; the production method has no pollution to the environment, is harmless to human health, and is safe and environmentally friendly; no harmful gas is generated; and the problem that urban sludge cannot be directly returned to fields is solved. A new way for resource recovery, reduction and harmless utilization of urban sludge and wood dust is provided.

The invention discloses a material circulating system formed by waste acetylene sludge and the chlor-alkali industry. The system comprises: pretreated waste acetylene sludge is reacted with hydrochloric acid, the reaction product is filtered to obtain a calcium chloride solution; the filtrate is reacted with sodium hydroxide generated by electrolysis of a chlor-alkali factory to generate high-purity calvital; the calvital is chloridized, centrifugated, dried and crushed to prepare bleaching powder; and filter cakes are reacted with the hydrochloric acid to generate active carbon. The calcium chloride generated in the reaction can be prepared into calcium chloride dihydrate and anhydrous calcium chloride; and sodium chloride after treatment can be taken as a raw material for electrolysis. The material circulating system effectively solves the problem of treating the waste acetylene sludge and raw material problem in the chlor-alkali industry, embodies recycling economy; and byproducts of the bleaching powder and the active carbon and calcium chloride dihydrate products improve deep processing capacity of an enterprise.

Belonging to the technical field of recovery of low C / N sewage treatment, sludge reduction and nitrogen and phosphorus recovery, the invention relates to a device and method for residual sludge fermentation coupled AO biological denitrogenation. The method comprises an AO apparatus, a secondary sedimentation tank, a mud storage box, a fermentation apparatus, a fermentation liquid separation tank, a nitrogen and phosphorus removal tank, and a raw water tank. The method includes: subjecting the residual sludge to anaerobic fermentation in a fermentation apparatus to produce acid, conducting nitrogen and phosphorus removal on the generated fermentation liquor, then using the fermentation liquor as an external carbon source of AO apparatus feedwater to improve the C / N of the AO system feedwater; subjecting the AO apparatus feedwater firstly to denitrification by an anoxic zone, then conducting nitrification by an aerobic zone to remove nitrogen in domestic sewage, discharging the residual sludge of the AO apparatus directly into the fermentation apparatus to produce acid by fermentation so as to reduce the sludge discharge of the AO apparatus, and simultaneously adopting a struvite technique to recover nitrogen and phosphorus in a nitrogen and phosphorus apparatus.

The invention belongs to the field of sludge treatment, and particularly relates to a device and a method for treating sludge through earthworm cultivation. An earthworm cultivation device comprises abracket, a plurality of transporting and cultivating units, a feeding end and a discharging end; the plurality of transporting and cultivating units are arranged on the bracket at up-and-down intervals; the feeding end and the discharging end are arranged at the left side end and the right side end of the transporting and cultivating units correspondingly; each transporting and cultivating unit comprises a supporting net, chains, a gear and a motor; the supporting net is used for placing sludge and annularly closed in the left-and-right direction; the chains are arranged at the front end andthe back end of the supporting net and used for driving the supporting net to move; the gear is used for driving the chains to move; the motor is used for driving the gear; a supporting frame is arranged at the feeding end; a foldable transporting plate corresponding to each transporting and cultivating unit is arranged on the supporting frame. Compared with the existing equipment, the earthworm cultivation device adopts automation, is simple in structure, easy to operate and low in manpower demand, and greatly reduces labor cost. Moreover, the occupied area is reduced, the earthworm cultivation efficiency can be effectively improved, the cultivation time is shortened, the yield of the earthworms is increased, energy consumption is reduced and the cultivation cost is reduced.

The invention relates to a method for accelerating enzymolysis saccharifying of lignocellulose by utilizing sludge protein as an enzymolysis accessory ingredient. The method comprises the following steps: crushing, screening and soaking lignocellulose biomass and separating lignocellulose biomass powder; taking municipal sludge and adjusting pH value to 9-12; performing ultrasonic treatment and then cooling to room temperature; separating supernate and drying, thereby acquiring the sludge protein powder; adding citric acid-sodium citrate buffer solution into the lignocellulose biomass powder and uniformly mixing, thereby acquiring a mixed solution; adding cellulase and sludge protein powder into the mixed solution, thereby acquiring enzymatic hydrolysate; and performing enzymatic hydrolysis reaction for 25-48h at 35-50 DEG C, thereby completing the enzymolysis saccharifying of the lignocellulose by utilizing the sludge protein as the enzymolysis accessory ingredient. According to the method provided by the invention, the sludge protein is used as the enzymolysis accessory ingredient; the non-specificity absorption of the lignocelluloses to cellulase is reduced; the dosage of the cellulase is saved; the enzymolysis saccharifying of the lignocelluloses is enhanced; the resource utilization of the sludge is realized; the efficiency is higher.

The invention discloses a method for making active carbon by utilizing dyeing sludge. The method comprises the following steps of: a, a pyrolyzing process: drying the sludge and pyrolyzing at the low temperature under the isolated air state; b, an oxidation pickling process; preparing a mixed aqueous solution mixture of potassium permanganate and sulfuric acid, wherein the potassium permanganate is 0.1mol / L-0.2mol / L, and the sulfuric acid is 1mol / L-1.8mol / L; soaking fixed carbon compound in a solid-liquid ratio of 1:(2-2.5), using the filtrate as aluminum ferric sulfate composite type purifying agent after removing heavy metal impurities; and drying the filter residue. According to the method for making active carbon by utilizing dyeing sludge disclosed by the invention, the sludge is used as the material to make the active carbon with low manufacturing cost and high carbon content through a pyrolyzing-oxidation pickling combination process. Moreover, the production process is almost free of pollution to the environment.

The invention discloses a device and a method for coupling micro-alkaline and micro-aerated anaerobic fermentation of sludge with SBR nitrogen and phosphorus removal and sludge reduction, and belongsto the field of low-C / N urban sewage treatment and sludge reduction. The method comprises the following steps: pumping the residual sludge into an anaerobic fermentation micro-alkali micro-aeration device for anaerobic fermentation of sludge to extract an internal carbon source; meanwhile, forming struvite precipitates by NH4<+>-N and PO4<3->-P generated during fermentation and Ca<2+> to remove NH4<+>-N and PO4<3->-P in a fermentation product so as to purify the fermentation product; performing sludge-water separation on the fermentation product in a secondary precipitation tank; pumping supernatant into a fermentation liquid tank; mixing and pumping the fermentation liquid and domestic sewage into an SBR nitrogen and phosphorus removal device. According to the invention, the anaerobic fermentation of sludge is performed under micro-alkali micro-aeration conditions to extract the internal carbon source; the fermentation product is used as an external carbon source; the SBR nitrogen andphosphorus removal device is used to realize deep nitrogen and phosphorus removal of low-C / N urban sewage; the residual sludge of the SBR nitrogen and phosphorus removal device is used in the anaerobic fermentation micro-alkali micro-aeration device to achieve a purpose of sludge reduction while reducing treatment cost of the residual sludge.

The invention provides a preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment. The preparation method comprises the following steps: immersing fly ash in a 3-6% NaOH solution at 20-30DEG C for 3-4d, washing the immersed fly ash with deionized water, and drying the washed fly ash at 100-110DEG C; drying excess sludge and clay at 100-110DEG C; drying above three raw materials, crushing the dried three raw materials, and sieving the crushed three raw materials for later use; fully mixing, by mass, 30-60% of the preprocessed fly ash, 30-60% of the preprocessed excess sludge and 10% of the preprocessed clay to obtain a dry material; adding a proper amount of deionized water to the dry material, uniformly stirring to prepare a 1-3mm blank, placing the blank in a tray, and drying the tray in a 110DEG C oven until the surface of the blank has no water; putting the dried blank in a muffle furnace, heating the blank to 350-500DEG C, preheating the blank for 10-40min, heating the blank to 800-1100DEG C, sintering the blank for 10-25min, cooling the obtained product in the furnace to 180-200DEG C, and taking out the cooled product to obtain the sludge ceramsite. The sludge ceramsite prepared in the invention has the advantages of low price, economical property, high efficiency, environmental protection, and suitableness for treatment of medium and low concentration ammonia nitrogen wastewaters.

The invention discloses a heat pump coupled adsorption type closed system for drying sludge. The structure of the system comprises three closed loops, namely a heat pump system refrigeration working medium circulation loop, an adsorption system regenerated air circulation loop and an air circulation loop for drying sludge. The heat pump system refrigeration working medium circulation has the effects of dehumidifying and heating the air for drying sludge, so that the air continuously performs circulation of a sludge drying process, a dehumidifying process and a heating process. A heat pump system utilizes the recovered condensation heat to heat the air for drying sludge. An adsorption system adopts a fixed bed, rotating wheel or moving bed adsorption device to dehumidify the air for dryingsludge for the second time so as to enhance the efficiency of the sludge drying process, and utilizes regenerated air to perform desorption treatment on the adsorption device saturated with water, thereby realizing continuous and uninterrupted operation of the adsorption system. The adsorption system adopts a cooling mode to dehumidify the high-humidity regenerated air, and simultaneously utilizesthe waste heat of the heat pump system as a unique heat source for heating the dehumidified regenerated air, so that the regenerated air continuously performs circulation of an adsorption device desorption process, a dehumidifying process and a heating process. The device is of a fully-closed structure, and both the adsorption system regenerated air circulation loop and the air circulation loop for drying sludge do not discharge any gas.

The invention relates to a method for disintegrating excess sludge through combination of ultrasonic waves and modified eggshells. The method comprises steps as follows: firstly, in terms of 0.05-0.4 g of modified eggshells added to the excess sludge per ml, the modified eggshells are added to the excess sludge, the modified eggshells and the excess sludge are mixed uniformly, and sludge slurry is prepared; the sludge slurry is subjected to ultrasonic treatment through the ultrasonic waves, and the excess sludge is disintegrated. With the adoption of the modified eggshells, the waste eggshells are changed to be wealthy, the environmental pollution is reduced, the problem about disposal and treatment of the eggshells is solved effectively, further, an effective chemical for disintegrating the excess sludge is obtained, the chemical cost for sludge treatment is saved, and the treatment cost of the excess sludge is reduced; with the introduction of the ultrasonic waves in a disintegrating experiment, the sludge cell disintegrating speed is increased greatly, the disintegrating time of the excess sludge is shortened effectively, the treatment efficiency is improved, besides, the disintegrating effect of the excess sludge is remarkable, the settling property is improved perfectly, and the disintegrated sludge is free of foul smell.

The invention relates to a method for preparing biodiesel by floating slag from an in-situ esterification sewage treatment plant. The method comprises the following steps: performing pretreatment on the floating slag to get sludge after drying; adding methanol and a sulfuric acid solution into the sludge after drying, performing a stirring reaction at appropriate temperature and performing in-situ esterification; and reducing a mixed solution after in-situ esterification to room temperature, adding an n-hexane solution, and performing mixed reaction-centrifugation-abandonment of solids-recovery of supernatant fluid-extraction-filtration to get the biodiesel. According to the method disclosed by the invention, the biodiesel is prepared by taking the floating slag from an urban sewage treatment plant as a raw material for in-situ esterification, the problem of treatment and disposal of the floating slag from the sewage treatment plant can be solved, and the productivity of the biodiesel can be more than 20%, which can be improved by at least 100% in comparison with the productivity of the biodiesel prepared from the sludge.

The invention relates to a photo-Fenton-positive permeation integrated device for treating organic wastewater difficult to biodegrade and a using method of the device. The device comprises a photo-Fenton unit and an immersed positive permeation unit. The method for treating the water by using the device comprises the photo-Fenton process and the positive permeation process, and while organic pollutants are effectively degraded or converted by using the photo-Fenton unit, the organic pollutants which are not completely degraded or converted in the photo-Fenton process are permselectively intercepted by using a positive permeation membrane. The immersed positive permeation unit adopts an immersed positive permeation structure, a water inlet end circulating pump or an inlet water tank is notneeded, the overall structure is compact, the energy consumption is low, and the photo-Fenton-positive permeation integrated device is easily combined with other technologies or devices. Active substances generated by the photo-Fenton unit are used up in the pollutant degradation and converting process and in the positive permeation unit migration process, the strong oxidizing property of the photo-Fenton unit cannot affect the stability of the membrane, the wastewater treatment efficiency is high, the wastewater treatment effect is good, and the device is suitable for application and popularization.

The invention discloses an in-situ dewatering method for sludge of sewage treatment plants. The method comprises the steps of injecting sludge dewatering agents into sludge by using a high-pressure jet-grouting pile machine and mixing and stirring the agents with the sludge evenly; and treating the treated sludge by using a conventional vacuum preloading method. The method can overcome difficulties of treatment of large-area sludge stacked places, the sludge is not needed to be excavated and treated in another place, problems of secondary pollution of stink, sewage and the like produced in the excavation and transport process are solved, and the in-situ dewatering method has advantages of short treatment period, low cost and the like compared with treatment methods of burning, compost and the like.

The invention discloses a method for producing sintered straight-through water-conveying water-permeable bricks by utilizing lithium tailings and steel slag tailings. The method comprises the following steps: performing homogenization treatment on the lithium tailings and the steel slag tailings, putting the processed lithium tailings, the processed steel slag tailings, a clay raw material and water into a ball mill according to a certain ratio, performing mixing fine grinding, performing sieving to remove iron, putting the iron-removed material in a mud pool, performing filter pressing to form a mud cake, performing mud refining to extrude mud sections, performing extrusion molding on the mud sections to obtain wet green sintered water-permeable bricks with uniformly-distributed straight-through water-conveying holes of 5-10 mm, cutting the wet green bricks, putting the cut wet green bricks on supporting plates, sending the supporting plates to a tunnel kiln, and performing drying; and performing high-temperature sintering on dry green bricks according to a certain firing system at temperature of 1100-1200 DEG C in an energy-saving double-layer tunnel kiln to prepare the water-permeable bricks. The water-permeable bricks disclosed by the invention have a plurality of functions such as very good water permeability and hydrophobicity, no pollution, high strength, strong corrosion resistance, good freeze-thaw resistance, long service life, climate adjustment, elimination of an urban heat island effect, and maintaining of surface water circulation, and meet the requirements ofenergy conservation and emission reduction, environmental protection and development of low carbon economy in China.

The invention relates to a method for processing algae-enriching water. The method comprises the following steps of: a) obtaining algae liquid after thoroughly decomposing and hydrolyzing; b) carrying out anaerobic digestion on the algae liquid; c) carrying out anaerobic-aerobic processing on the algae liquid after the anaerobic digestion; and d) discharging the algae liquid subjected to the anaerobic-aerobic processing after nitrogen and phosphorus are absorbed by water plant. The invention also relates to an application system of the method for processing the algae-enriching water. According to the method and the system which are disclosed by the invention, the difficult problem of processing a large amount of cyanobacteria bloom in Lake Taihu can be effectively solved, organic pollutants and nitrogen and phosphorus nutrients in the algae-enriching water can be effectively removed, the purposes of biogas production by blue green algae organic biomass and the agriculture resource utilization of the nitrogen and the phosphorus can be realized while the lake water quality is directly improved, and the processed tail water can reach to a level A emission standard related to the national standard. Compared with the regular algae-enriching water gas floatation thickening method, the method disclosed by the invention has the advantages of having a good removing effect, being simple in operation and management and good in energy saving effect, greatly reducing the processing cost of the blue green algae, and having excellent social benefit and economic benefit.

The invention relates to a method for making sludge into nutrient soil through anaerobic fermentation. Through a reasonable compounding ratio and reasonable arrangement of substrates in a fermentation tank, step-by-step purification layers of an odor substrate adsorption layer, a microbial decomposition layer and a plant absorption layer are formed, so that less odor is given off into air, or the odor is prevented from being given off into the air; in addition, a methane collecting system is paved at the upper part of the anaerobic fermentation tank, so that recycling of sludge energy resources can also be realized. Through 12-month long-time anaerobic fermentation, organic matters which are easy to decompose in sludge can be converted into stable humus type substances, and the content of humus is increased by about 25%. The high-temperature stage duration in the anaerobic fermentation process is long, so that original pathogenic bacteria in the sludge can be killed. The sludge is mixed with alkali soil, so that curing and passivating effects on original heavy metal can be achieved, the validity of the heavy metal is reduced by about 50%, besides, the decomposition effect on antibiotics and durable organic compounds contained in the sludge can be achieved, and the harmfulness of the sludge is reduced.

The invention discloses a water-retaining agent, which is prepared with a chemical method by that lignin extracted from papermaking sludge is utilized, and meanwhile monomer, initiator and crosslinker are added. The water-retaining agent comprises the following ingredients in percentage by weight: 24-29wt% of the lignin, 0.03-0.15wt% of the initiator, 69-77wt% of the monomer and 0.07-0.6wt% of the crosslinker. The water-retaining agent has the advantages of abundant raw materials, low cost, good performance and high stability, the problem that the traditional water-retaining agent is difficult to degrade and the problems of high preparation cost and poor compatibility are solved, the papermaking sludge processing and disposal problem can also be solved, the sludge is recycled, and small pollution is caused to the environment.

The invention discloses a blue-green algae solid moulded fuel and a preparation method thereof. The blue-green algae solid moulded fuel is obtained by taking blue-green algae as a raw material, drying the blue-green algae till the moisture rate is 8-15% and then adding a denitration mildew preventive for extrusion forming. The preparation method comprises the following steps: drying; crushing; adding the denitration mildew preventive; and extruding forming. The method disclosed by the invention has the characteristics of low cost, low energy consumption, energy conservation and environment friendliness, high treatment efficiency and the like, is simple and feasible, and is convenient for large-scaled industrial production. The produced solid fuel is convenient to store and transport, high in heat value, high in moulding property, low in percentage of damage, hardly mildewed, high in combustion efficiency, less in pollution, wide in application range and the like.

The invention relates to a sludge magnetic dewatering agent and a dewatering method thereof. The magnetic dewatering agent is composed of the following compositions in percent by weight: 9-19% of acrylamide, 7-17% of chitin, 14-21% of ferric chloride, 10-17% of sodium chloride, 15-22% of aluminum chloride, 1-8% of concentrated sulfuric acid and 15-32% of iron powder. The dewatering agent is wide in raw material source and low in price. Dewatering is performed by employing a magnetic dewatering machine and utilizing the magnetic dewatering agent, the sludge dewatering time is reduced, and also deep dewatering for sludge is realized, 1 ton of sludge with the water content of 60%-99% can be dewatered to have the water content of 25-45% in 45 min, subsequent processing of sludge is substantially facilitated, requirements on subsequent second ploughing and greening are satisfied, and the processing and disposing problems of a large amount of stacked sludge are solved. By employing the magnetic dewatering machine, economy, convenience and good dewatering efficiency are realized.

The invention provides a method for degrading atrazine in water by activating potassium peroxymonosulfate through iron-aluminum mud. The method comprises the steps of adding naturally-aired, crushed, ground, sieved and uniformly mixed iron-aluminum mud into an atrazine solution in a certain solid-liquid ratio, and adding a certain concentration of potassium peroxymonosulfate, so as to remove atrazine. The method for degrading atrazine in water by activating potassium peroxymonosulfate through the iron-aluminum mud has the beneficial effects that the operation is simple, the degradation effect is good, the degradation efficiency can reach 95% or above, and meanwhile, the treatment problem of the iron-aluminum mud can be solved.

The invention belongs to the technical field of low C / N ratio high nitrogen wastewater (C / N is less than 4) treatment, and particularly relates to a sludge fermentation enhanced short-cut denitrification-anaerobic ammonia oxidation nitrogen removal and phosphorus recovery device and method, which comprises an anaerobic fermentation reactor, a short-cut denitrification reactor, a nitration reactor and an anaerobic ammonia oxidation reactor, the method comprises the following steps: firstly fermenting excess sludge in a sludge fermentation system to produce acid, carrying out mud-water separation, then mixing the excess sludge with high-nitrogen wastewater in a mixing pipe, adding an agent II to form blue iron ore, carrying out mud-water separation in a sedimentation tank to recover phosphorus resources, firstly feeding supernate into an exogenous short-cut denitrification reactor, carrying out short-cut denitrification NO2-N accumulation by microorganisms by utilizing an external carbon source, and carrying out secondary denitrification by utilizing a secondary carbon source to obtain the high-nitrogen wastewater. Meanwhile, the sewage enters the nitration reactor through a filter for nitration reaction, nitration wastewater containing part of ammonia nitrogen flows back to the short-cut denitrification reactor for NO2-N accumulation, and the sewage enters the anaerobic ammonia oxidation reactor to realize autotrophic deep nitrogen removal.

The invention discloses baking-free bricks prepared through heavy-metal-polluted bottom mud. A preparation method of the baking-free bricks includes the following steps that firstly, 30% to 40% of the heavy-metal-polluted bottom mud, 40% to 45% of aggregate and 20% to 25% of a composite curing agent are added to a stirring machine to be mechanically stirred evenly to obtain a premix; secondly, the premix treated through the first step is conveyed into a brick making machine through a conveyor, extrusion forming is conducted, and cutting is conducted on a green brick cutting table to form green bricks; and thirdly, the green bricks are stacked on a sunning ground to be naturally sunned for a week or more, in the sunning process, the green bricks are watered and maintained through warm water with the temperature ranging from 20 DEG C to 40 DEG C every morning, and the baking-free bricks are prepared. According to the baking-free bricks, the polluted mud is used, clay resources are saved, environment pollution and land occupation due to a mud storage yard are reduced, meanwhile, resource utilization of the mud is achieved, and the sustainable development of the nation is facilitated.