926results about "Fixation/solidifcation sludge treatment" patented technology

This invention provides a method for stabilization of combined heavy metal bearing materials and wastes subject to acid and water leaching tests or leach conditions by addition of stabilizing agents such that the leaching potential is inhibited to desired levels and the material or waste is free flowing. The resultant material or waste after stabilization is deemed suitable for on-site reuse, off-site reuse or disposal as RCRA non-hazardous waste.

A method of waste stabilization by mineralization of waste material in situ in a treatment container suitable or treatment, transit, storage and disposal. The waste material may be mixed with mineralizing additives and, optionally, reducing additives, in the treatment container or in a separate mixing vessel. The mixture is then subjected to heat in the treatment container to heat-activate mineralization of the mixture and form a stable, mineralized, monolithic solid. This stabilized mass may then be transported in the same treatment container for storage and disposal.

The invention provides a method and a device for processing radioactive wastewater. According to the method and the device, the radioactive wastewater is processed by a disk tubular reverse osmosis (DTRO) membrane component, so that effects of efficient decontamination factors and high cycles of concentration can be obtained at the same time. The method comprises the steps of enabling the radioactive wastewater to flow through a first-level membrane component and a second-level membrane component in sequence to obtain second-level water; and enabling first-level concentrated water out of the first-level membrane component to enter a third-level membrane component and obtain a concentrated solution.

The invention discloses a method for solidifying sludge with a high water content. At first, dredged sludge is collected and stored, basic physical indexes of sludge are measured, the sludge and alkali residues are mixed to form matrix soil; a curing material is added and then is evenly mixed and stirred; then the matrix soil containing the curing agent is transported to a fixed location; the matrix soil is covered and cured for a prescribed period; and finally the mechanical indexes of cured sludge are measured. The optimal ratio of alkali residues to dry sludge is 30-50:100. The curing material comprises following components in percentage by the weight of dry mixed soil: 10 to 25% of mineral powder, 0.1 to 0.5% of super absorbent resin, and 2 to 6% of sodium silicate. The cooperative effect between alkali residues and sludge with a high water content is utilized to form matrix soil; super absorbent resin is used to reduce the water content of sludge, the utilization rate of alkali residues is increased, the solidification cost is reduced, and the solidified soil has the advantages of high early strength and low compressibility and meets the engineering requirements of filling soil.

The invention discloses a microbial solidification method for dredged sludge and belongs to the field of dredged sludge solidification. The method comprises the following steps that urea, calcium chloride and bacillus pasteurii liquid are added into the dredged sludge and then stirred to be uniform, and maintenance is conducted in a natural environment or the solidification is accelerated through pre-pressure drainage, wherein in the method, according to the relation between the addition amount of the urea, the calcium chloride and the bacillus pasteurii liquid and the amount of the dredged sludge, 40 g of urea, 70 g of calcium chloride and 40 mL of bacillus pasteurii liquid are added into every 1 kg of dredged sludge; or the concentration of the added urea is 0.1-1 mol/L, the concentration of the added calcium chloride is 0.1-1 mol/L, the addition amount of the bacillus pasteurii liquid is 1/50-1/5 of the water content of the dredged sludge. While making the soil mass cemented and enhancing the strength of the soil mass, the calcium carbonate generated through the induction of bacillus pasteurii can form drainage channels in the sludge so as to improve the permeability of the sludge; therefore, the water is quickly discharged under the action of external pressure, and the solidification time is shortened.

The invention provides a remediation agent and a remediation method for in-situ remediation of a water body and sediment. The remediation agent is prepared by mixing a metal ion complexing agent, an adsorbent, a high efficient flocculant, a specific gravity regulator, a curing agent, auxiliary agents and other components according to a certain proportion, and then compounding the mixture; the remediation agent is added into the water body or the sediment to be treated, and is mixed with the water body or the sediment by stirring; heavy metals in the water body or muddy water are subjected to in-situ complexing of the remediation agent, and pollutants and flocculations in the water body are absorbed by the remediation agent, so as to float to the surface of the water body or transfer into the sediment, so that the aims of realizing in-situ collection and enrichment of the pollutants in the water body and enabling the pollutants to be solidified and sealed in the sediment are achieved; after the remediation agent is used, the water quality of the water body and the environment of the sediment are rapidly improved, and the natural construction of a water ecosystem is facilitated, so that the in-situ remediation of the water body and the sediment are realized. The remediation agent and the remediation method can be used for comprehensive remediation of eutrophic or organic and heavy metal seriously polluted lakes, rivers, reservoirs, wetlands and ponds.

Methods for removing one or more contaminants from an aqueous stream comprising: adding one or more hydraulic binders and one or more promoters to the aqueous stream, and separating the contaminants from the aqueous stream are provided. The methods may be used for removing contaminants that are arsenic-based, selenium-based, cadmium-based, zinc-based, mercury-based, iron-based, chromium-based and/or phosphate-based.

The invention discloses a water body heavy metal polluted sediment in-situ covering and repairing method. The water body heavy metal polluted sediment in-situ covering and repairing method is characterized in that at least one layer of a first covering layer, a second covering layer and a third covering layer is sequentially arranged on polluted river sediment or a river slope from bottom to top; filler in the first covering layer is a mixture of cerium modified zeolite and zero-valent iron; filler in the second covering layer is selective heavy metal curing filler; filler in the third covering layer is mixed filler of activated carbon and sand; a water body can be divided into a shallow water slow flowing water body, a deep water body and a torrent water body according to the depth and the flowing speed of the water body by the three covering layers, and the shallow water slow flowing water body, the deep water body and the torrent water body can be selectively combined. The water body heavy metal polluted sediment in-situ covering and repairing method disclosed by the invention aims at different sediment pollution situations; a covering body combines physical, chemical and biological repairing measures together through a way of stacking different structure layers up and down, so that sediment pollution is efficiently removed or reduced, and the covering layers and heavy metals adsorbed thereby can be well recycled.

A method of and system for removing phosphorus from wastewater using a waste sludge that has a high affinity for phosphorus. So the waste sludge can be used in a flow-through contact reactor to remove the phosphorus from a wastewater stream, the waste sludge is pelletized. The waste sludge pellets are packed into one or more flow-through contact reactors. In the configuration described herein, phosphorus removal is maximized by flowing the wastewater through the reactor(s) in a “pulsed” manner, rather than continuously. Thus, wastewater is flowed through the reactor(s) for a period of time and stopped for a period of time. By giving the sludge absorbent a rest period, the absorption capacity of the sludge is increased significantly, thus decreasing the frequency of regeneration or replacement of the sludge. Sludge regeneration can be accomplished with a stripping step using an alkaline solution of pH 13, followed by rinsing with water.

A process for drying fine tailings is provided. The process, which may use a pipeline reactor system, comprises providing an in-line flow of the fine tailings; continuously introducing a flocculent solution to cause dispersion and commence flocculation of the fine tailings and may comprise rapid turbulent mixing; subjecting the fine tailings to flocculation and water release conditioning in-line to cause formation and rearrangement of floes and increasing the yield shear stress to form flocculated fine tailings while avoiding over-shearing of the flocs; and depositing the fine tailings to allow the release of water, formation of a non-flowing fine tailings deposit and drying of the non-flowing fine tailings deposit. The process enables effective in-line dispersion, flocculation and water release, resulting in reliable deposition and drying of the fine tailings deposit.

An object of the present invention is to manufacture a material for concrete by using a fresh concrete sludge as a starting material. The invention relates to a method of manufacturing a material for concrete in which a material for concrete is manufactured from a slurry composed of a fresh concrete sludge obtained by treating a fresh concrete waste to separate a coarse aggregate and a fine aggregate. The manufacturing method comprises a grinding step of obtaining a product containing fine particles with a mean particle size of 10 μm or less by wet grinding the slurry under a condition of water content of 60 wt. % or more.

The invention relates to a drying treatment method of oil-containing sludge. The drying treatment method is characterized in that, in an oil-containing sludge drying treatment device, modifying treatment is carried out on the oil-containing sludge by utilizing an added improver, and the oil-containing sludge is made into fuel powder with a high combustion heat value through agitating and disintegrating the oil-containing sludge. The drying treatment method comprises the following specific steps of measuring the water content of to-be-treated sludge of the oil-containing sludge, and preparing the improver; conveying to-be-treated oil-containing sludge into the oil-containing sludge drying treatment device, starting agitation, and adding the improver into the oil-containing sludge drying treatment device according to a proportion of 10 to 40; ceaselessly agitating to-be-treated greasy filth in the oil-containing sludge drying treatment device, after the agitation is sufficient, starting a disintegration mechanism, carrying out disintegration on the modified greasy filth, and making the greasy filth into the fuel powder. The drying treatment method of the oil-containing sludge has the following beneficial effects that the extra use of water and an extracting agent is not needed in a production process; no waste gas is generated; the secondary pollution does not exist; only are the agitation and the disintegration needed in a treatment process, so that an overall technical process can be completed.

The invention relates to a sludge treatment process. The process comprises the steps as follows: a river is dredged by a dredging device and sludge is conveyed by a sludge pipeline; the sludge is sentto a garbage sorting machine for garbage sorting; the sludge is sent to a sand scraping separation system to remove sand in the sludge; the sludge is sent to a first-stage sedimentation tank of a sludge storage tank, a second-stage sedimentation tank and a third-stage sedimentation tank are arranged behind the sludge storage tank, and overflow water in the third-stage sedimentation tank is conveyed to a clear water tank; a dosing platform blends required chemicals and adds agents to sludge output by the sludge storage tank, output sludge is mixed, conditioned and then conveyed into a concentration tank to increase sludge concentration, then, secondary dosing is performed before dewatering, the sludge is sent to a dewatering platform for dewatering, and filter pressing water produced by the dewatering platform flows back to the second-stage sedimentation tank; overflow water in the third-stage sedimentation tank is discharged to the clear water tank, water in the clear water tank is recycled or directly discharged to the river. A relatively efficient water recycling system is adopted and dependence on clean water is reduced.

The invention relates to an in-situ biochemical repairing agent for bottom mud of a black and odorous water body. The in-situ biochemical repairing agent is prepared from the following raw-material constituents in parts by weight: 30 to 40 parts of modified biological charcoal powder, 20 to 60 parts of aggregate, 15 to 20 parts of microbial bacterial agent and 10 to 15 parts of co-substrate. The biochemical repairing agent provided by the invention is combined with physical absorption, chemical treatment and biological treatment; all components have mutual synergistic effects; the effect of reducing the pollution by the bottom mud is obvious, wherein modified biological charcoal can be used for effectively adsorbing a heavy metal and part of organic matters, which are released by the bottom mud; diatomite and montmorillonite, which serve as the aggregate, on one hand, can be used for effectively adsorbing part of pollutants, and on the other hand, can be used for providing an attachment carrier for the growth of a microbe together with the modified biological charcoal at the same time; the co-substrate can be used for promoting the growth of the microbe and activating the activityof the microbial bacterial agent; the repairing agent for the bottom mud is spherical, is difficult to flow away along with water, and can sufficiently exert an effect, and in addition, the in-situ biochemical repairing agent for bottom mud, which is provided by the invention, is wide in material source and low in cost and has practical popularization and application conditions.

The invention belongs to the technical field of water pollution treatment, and particularly relates to an arsenic-containing waste water treatment method and apparatus. The method comprises the following steps: performing the microwave catalytic oxidation precipitation treatment on arsenic-containing waste water with a pH value less than or equal to 10 under the catalytic effect of a microwave catalyst in an oxygen-containing atmosphere, and converting trivalent arsenic to pentavalent arsenic, co-precipitating the pentavalent arsenic and trivalent iron, thus obtaining the arsenic-containing waste water after the microwave treatment and iron arsenate-containing sludge, wherein the microwave catalyst is a wave absorption substance loading zero-valent iron, and a relative dielectric constantof the wave absorption substance is not less than 4. The arsenic-containing waste water after the microwave treatment can be discharged up to standard, a sludge stabilizer is added into the sludge, and the pH of the sludge is adjusted, so that the sludge is stabilized and reaches a bury standard. The method is an arsenic-containing waste water treatment method with low cost and high efficiency, and solves the technical problems in the arsenic-containing waste water treatment method in the prior art that the efficiency is low, the cost is high, secondary pollution is caused and heavy metal is difficult to mineralize and the like.

The invention discloses a sludge curing agent and application thereof. The sludge curing agent is suitable for curing treatment on high-water-content sludge in town sewage treatment plants, rivers andlakes. The sludge curing agent comprises the following raw materials in percentage by weight: 26 to 44 percent of silicon aluminum iron calcium oxide, 19 to 37 percent of calcium oxide, 13 to 30 percent of special cement, 5 to 25 percent of polyacrylamide and 0.2 to 3 percent of chitosan. The sludge curing agent realizes sludge curing and stabilization through the chemical property of the industrial waste and the mutual activity excitation; the water content of the sludge is effectively reduced, the early-stage compressive strength and the flexural strength of the sludge are improved, and mechanical operation during backfilling is facilitated; heavy metal in the sludge is adsorbed by the chitosan, organic matters are degraded, the pathogene is deactivated, pollution is reduced and stink can be eliminated; and the sludge curing agent is low in price and simple in curing process, and the cured sludge does not cause secondary pollution.

The invention relates to a construction method for dredging ditch sediments based on a hydraulic punching and filling geotechnical pipe bag and belongs to the technical field of dredging constructionof sediments in stinky water body ditches. The construction method for dredging the ditch sediments based on the hydraulic punching and filling geotechnical pipe bag includes the following steps of temporary storage yard construction, surface cleaning, sectional construction of cofferdam, construction drainage, assembly of a mud conveying pipeline, hydraulic punching and dredging of the sediments,adding medicament, geotechnical pipe bag filling, sludge dewatering and solidification and transportation or reuse of solidified soil. For the construction method, earth excavation is completed withthe help of hydraulic cutting; soil is then filled by a mud pump through the mud conveying pipeline to a large geotechnical pipe bag; in the dredging pipes, dredging mud and the medicament are fully stirred to produce a flocculation group to be precipitated in a geotechnical pipe belt, and then dehydration and solidification treatment of the sediments is achieved. The construction method for dredging the ditch sediments based on the hydraulic punching and filling geotechnical pipe bag has the advantages of continuity, integrated operation of dredging, conveying and filling, low cost, high construction efficiency, sealing property, no secondary pollution during transportation, good environmental protection performance, high construction precision, good effect, convenient operation and savedworking space.

The invention discloses a method for resource utilization of Fenton iron mud. The method comprises the following steps: adding sulfuric acid to the Fenton iron mud, converting Fe(OH)3 into Fe2(SO4)3 wholly, adding water to dilute after dissolving until the concentrations of iron ions are 70 to 98g/L to obtain a treatment solution I; adding the obtained treatment solution I to an anode chamber of a diaphragm electrolyzer, carrying out oxidation treatment on organic matters in the Fenton iron mud firstly, and then pumping into a cathode chamber of the diaphragm electrolyzer to carry out electroreduction treatment to obtain an Fe<2+> reducing solution; carrying out concentrated crystallization on the Fe<2+> reducing solution under the protection of an inert gas to prepare an industrial product, namely the ferrous sulfate product. According to the invention, the industrial ferrous sulfate is produced through electroreduction, so that the iron mud is fully subjected to resource utilization.

The invention particularly relates to a silt/sludge solidifying agent and application thereof.The silt/sludge solidifying agent is characterized by being mainly prepared by mixing, by mass, 60-75% of nano-micron modified binding material, 5-10% of poly-aluminum-ferric silicate, 10-20% of zeolite powder or bentonite and 5-15% of quicklime.Paving construction of road filling can be performed by adding the silt/sludge solidifying agent accounting for 10-20% of total amount of silt/sludge into the silt/sludge, mixing and stirring in a stirrer for 10-30 min and placing under sunlight for sufficient irradiation and solidification after stirring is finished.The silt/sludge solidifying agent can lower water content of high-water-content silt/sludge, is high in solidifying strength and capable of effectively solidifying heavy metals in the silt/sludge and reaches requirements of filling and building earth filling.

The invention specifically relates to an oily sludge drying agent, and preparation and application methods thereof, belonging to the technical field of solid waste treatment. According to the oily sludge drying agent and the preparation and application methods thereof in the invention, oily sludge drying efficiency is greatly improved and the addition amount of the drying agent is effectively reduced by comprehensively utilizing industrial solid waste such as fly ash and compounding effective components such as limestone, gypsum and lignosulfonate; raw materials are easily available, and preparation cost is low; and when applied to drying of oily sludge, the oily sludge drying agent can greatly reduce the outward transportation volume and treatment cost of the oily sludge and has good economic, environmental and application value.