7250results about "Sludge treatment by de-watering/drying/thickening" patented technology

A process for producing biodiesel has been invented by first extracting lipids from the sludges generated during primary and/or biological treatment of municipal, agricultural, and industrial wastewaters using primary, secondary, and tertiary treatments followed by the transesterification of the extracted lipids using transesterification conversion into alcohol-based esters. The resulting products from this process include biodiesel, glycerol, lipid-free proteins, various other useful chemicals and an aqueous-based substrate well suited for optimized digestion within subsequent biological digestion (either aerobic or anaerobic). The lipids extracted from the sludges containing high levels of microorganisms are phospholipids which can also be directly used as lecithin. The extraction of the lipids from the sludges will be performed using chemical extraction techniques with the transesterification of the extracted lipids accomplished using basic, acidic, and/or a combination of the two transesterification techniques.

Method for producing an hydrophobically associative polymer is provided which is characterized by forming a monomer solution comprising a surfactant, at least one hydrophobic ethylenically unsaturated monomer, at least one hydrophilic monomer selected from nonionic ethylenically monomers, cationic ethylenically unsaturated monomers, anionic ethylenically unsaturated monomers or mixtures thereof, and water; forming a salt solution comprising a multivalent salt and water; mixing the monomer solution and salt solution to form a mixed solution; and charging the mixed solution with an initiator, thereby polymerizing the monomers to form the hydrophobically associative polymer in a dispersion. Aqueous dispersion containing the hydrophobically associative polymer formed by the method. The aqueous dispersion containing the hydrophobically associative polymer may be used in a paint formulation, in a mobility control fluid useful in enhanced oil recovery, in a secondary or tertiary oil recovery system, in an enhanced oil recovery method, in a cementious composition, in an oil well drilling mud formulation, in a fracturing fluid formulation, in a wastewater treatment system, or in a dewatering sludge system.

The invention discloses a method for continuously treating domestic garbage, more specifically belongs to a method for continuously treating domestic garbage according to the process flows of pretreatment, crushing, dehydration, drying, cracking, incineration, etc. Dioxin C2H4O2 is not produced in the garbage treatment process; and the method can realize various requirements of massive and continuous treatment, reclamation (the energy in the garbage is stored in a manner of collecting hydrocarbon oil), energy saving, environmental protection, high efficiency, and the like, in domestic garbage treatment. The devices adopted in the method belong to standardized commodities for industrial use, and have the advantages of reliable operation, mature technology, simple structure and low investment. The method of the invention belongs to the continuous garbage treatment process, can completely and thoroughly implement reduction, harmless treatment and reclamation of mountains of domestic garbage, and is characterized by good novelty, creativity and industrial applicability.

A closed multi-room fluidized bed sludge drying method is provided, which is a sludge drying method having the advantages of simple equipment structure, convenient operation, strong sludge adaptability, high thermal efficiency, safety, continuity, stability, etc. After the mechanically dewatered sludge is mixed with the back-mixed sludge, the mixture is dried room by room in an inert particles multi-room fluidized bed dryer (3). The first room and the second room of the inert particles multi-room fluidized bed dryer (3) adopt inert particles (f) as heat storage medium. Gas from a cyclone separator (5) goes through a spray tower (7) and returns into an air heating unit (4) through a circulating fan (10). Part of dried sludge (e) at the lower part of the cyclone separator (5) enters the inert particles multi-room fluidized bed dryer (3) through the back-mixing in a mixer (2). Waste liquid from the bottom of the spray tower (7) enters a waste liquid circulating pool (8), with part of waste liquid circulating into the spray tower (7) and part into a sewage treatment system.

A desalination plant for treating a sea water or brackish water feed is provided. The desalination plant includes a first treatment section to effectively remove scaling species, the first treatment section including nanofiltration section, the nanofiltration section including at least two stages and at least two passes; and a reverse osmosis section that operates at high recovery to produce a purified permeate stream and a selectively NaCl salt-enriched reject stream as a saline output.

The invention relates to a sludge treatment process based on a hydrothermal modification technology. The sludge treatment process is carried out by comprising the following steps of: (1) temporarily storing the sludge which is subjected to mechanical dehydration and has the water content of 70-85% to a pretreatment unit and deodorizing the sludge; (2) introducing to a homogeneous device, fully mixing and homogenizing, introducing the homogenized sludge to a slurrying device, introducing the slurried sludge to a hydrothermal reactor for hydrothermal reaction, and introducing the hydrothermal sludge to a flash evaporator for decompression and flash evaporation; (3) cooling to 35-45 DEG C by using a cooler, then introducing to a high-pressure diaphragm pressure filter for pressure filtering and dehydration to obtain a dehydrated mud cake with the solid content of 35-45% and dehydrated filtrate; (4) introducing the dehydrated filtrate to an intermediate temperature anaerobic reactor, wherein the residence time is for 5.5-7.5d, the inlet water temperature is controlled below 40 DEG C, and the anaerobic reaction temperature is 30-40 DEG C; and (5) preparing a biomass fuel rod by using the dehydrated mud cake, and introducing the biomass fuel rod to a boiler to provide steam for the hydrothermal reactor and the flash evaporator. The sludge treatment process has the advantages of goodtreatment effect, obvious volume reduction effect, high harmless degree, recycling of methane, good economic benefit and the like.

This invention is directed to structurally-modified water-soluble polymers prepared by initiating polymerization of an aqueous solution of monomers under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30 % polymerization of the monomers has occurred, and to use of the water-soluble cross-linked polymers as flocculating agents.

The invention provides an environment-friendly silt curing agent, which is manufactured through the following steps: one or two among fly ash, calcium sulfate, sodium sulfate, sodium carbonate and potassium carbonate, one or two among slag, slag combination, potassium hydroxide, calcium oxide, sodium silicate or silicon dioxide, one or two among carbide slag, lime or gypsum, as well as one or two among triethanol amine surfactant, calcium lignosulfonate or sodium lignosulfonate form a plurality of optimal compound formulations according to respective attributes, are optimized, compounded, ground till the Brinell specific surface areas are between 300 and 900 m2/kg respectively and then mixed, wherein particle sizes are between 0.00040 and 0.5 mm. As a large amount of waste is utilized, the curing agent saves raw materials, solves the problems about waste discharge and environmental pollution, controls waste through waste, and has important significance to environmental protection. The invention aims to provide the environment-friendly silt curing agent which has strong adaptability to a plurality of types of silt and soil, is good in curing effect, good in durability after curing and capable of utilizing industrial waste, and can be widely applied to fill engineering, embanking or embankment reinforcement engineering, road engineering and other fields.

This invention is directed to systems, devices and methods for treating organic-containing sludges and converting such sludges to high value fertilizers containing both inorganic and organic fertilizer components, which creates an inorganically-augmented bioorganic fertilizer. The invention describes methods to create a thixotrophic or paste-like material via the application of mixing energy to the organic sludge followed by an alkaline treatment and a subsequent ammoniation. The invention further describes a method to increase the plant nutrient content in the organic containing product to a level which permits the finished granular fertilizer product to compete in the commercial agricultural fertilizer marketplace. Further, the invention reduces odors associated with said organic-containing sludges.

The invention relates to a centralized kitchen waste treatment method which comprises the following steps of: (A) sorting kitchen waste; (B) separating oil from water; (C) treating oil; (D) treating sewage; and (E) treating odor. Compared with a traditional kitchen waste burying method, by using the centralized kitchen waste treatment method, a great amount of soil is saved and an available methane resource is generated, kitchen waste reaches 100 percent of harmlessness, more than 95 percent of resource utilization and more than 95 percent of quantitative reduction, and the harmless treatmentof waste and the recycle of resources are truly realized.

A device for separating water from sludge comprising a processing box, wherein a feeding cylinder is disposed above the processing box, and the feeding cylinder is fixedly connected to the processing box through a plurality of connecting rods; a rotating rod is rotationally connected into the feeding cylinder; a first rotating motor is fixedly connected to one side of the feeding cylinder; the output end of the first rotating motor penetrates through the side wall of the feeding cylinder, and is fixedly connected to the rotating rod; a spiral blade is fixedly sleeved with the rotating rod, and the outer side of the spiral blade is matched with the inner side wall of the feeding cylinder.

Methods and systems for treating a waste stream in a waste treatment system involve performing a unit process of the waste treatment system by contacting the waste stream with oxyhydrogen-rich gas generated on-site by an oxyhydrogen gas generator that implements water dissociation technology. In a preferred embodiment, the oxyhydrogen gas generator involves applying a pulsed electrical signal to a series of closely-spaced electrodes that are submerged in the waste stream to produce oxyhydrogen-rich gas from a water component of the waste stream. Operation of the oxyhydrogen gas generator in the waste stream may accomplish one or more unit processes for waste treatment, such as conditioning, stabilization, thickening, and dewatering, among others. At least a portion of the oxyhydrogen-rich gas can be conveyed for a second use in the waste treatment system, such as a source of combustible fuel for incineration or power generation, for example.

The invention relates to a processing method of stainless steel pickling waste liquid, which is characterized in that the processing method includes the steps that: neutral salt wastewater flows into a neutral reduction cell, and mixed acid pickling waste waters flow into a neutralizing tank; reducing agent is added into the neutral reduction cell, and then the reduced wastewater liquid is put into the neutralizing tank and is mixed with the adjusted mixed acid pickling waste waters, and liquid alkali is added into the neutralizing tank; the separated clear waste liquid removes fluorin ions in a settlement tank; neutralizing liquid is added into a final neutralizing tank to cause the pH value of treatment liquid to adjust to be neutralized wastewater liquid which passes through a sand filter to be discharged. The processing method has the advantages that metal ions and fluorin ions are performed the subsection treatment, and neutralizing agent is changed into the liquid alkali from lime cream, the requirement of reaching the standard of the waste liquid emission is not only achieved, but also the mud quantity produced by a mass of lime cream is greatly reduced, heavy metal mud of a retention pond only contains heavy metal compound, the salts of calcium fluoride and calcium sulphate, etc. are separated from the inclined plate settlement tank during the fluoridation stage, thereby the treatment cost is effectively lowered.

The invention discloses a circulating sludge biological fermentation tower which comprises a tower body, an openable tower cover, a storage tank and a plurality of rotatable fermentation devices, wherein the openable tower cover is arranged on the top of the tower body; the storage tank is arranged at the bottom of the tower body; the rotatable fermentation devices are arranged in the tower body in parallel; the fermentation devices divide an inner cavity of the tower body into a plurality of layers of fermentation bins along the axial direction; the lower part of each layer of fermentation device is provided with a ventilating oxygen supply pipeline communicated with a blower; the upper part of each layer of fermentation device is provided with an air outlet pipeline communicated with aninduced draft fan and a monitoring device; the monitoring device is controlled by a control room; and a mechanism for driving the fermentation devices and the tower cover to move, the blower and the induced draft fan are all controlled by the control room. The invention also discloses a circulating sludge biological processing system and a processing method. By the circulating sludge biological fermentation tower, the circulating sludge biological processing system and the processing method, industrial biological fermentation desiccation treatment can be continuously and stably carried out onsludge under the conditions of high efficiency and low energy consumption.

The invention discloses a neutral inorganic composite material for dehydration, solidification and modification of high water content sludge. The composite material comprises a powdery mixture consisting of the following components in part by weight: 100 parts of water hardened solidifying material consisting of hydrated gypsum and magnesium oxide, 80 to 120 parts of inorganic water absorption ash material, 20 to 40 parts of inorganic substance aid hardened material, 1 to 10 parts of high polymer coagulant and 1 to 5 parts of modifying functional agent. After being treated by the neutral inorganic composite material, the solidified sludge has high compressive strength; the pH of the lixivium is neutral, and meanwhile, harmful substances such as heavy metal and the like in the sludge can be effectively solidified; the treated sludge meets the requirement of landfill soil, soil for earthwork or soil for greening and farmlands; and the neutral inorganic composite material can be widely applied to the dehydration, solidification and modification of the high water content sludge such as sludge from waterworks, dredged bottom mud of rivers and lakes, residual building soil and the like.

A treatment method for wastewater employing sulfur dioxide and lime chemical dewatering technology in conjunction with an environmental photo biomass/algae biological treatment system growing photo biomass/algae to reduce dissolved solids, heavy metals, and ammonia in the wastewater to produce recovered treated wastewater for vegetation consumption, biofuel feedstock, and biofuel and carbon credits.

An apparatus for separating water from oil-based drilling fluid includes an separation tank, a chemical treatment apparatus having one or more de-oiling polymer preparation tanks, and a dissolved air flotation unit. Slop mud is directed into the separation tank where surfactant is added to separate the drilling fluid from oily water. The drilling fluid is drained for further processing. The oily water is removed by an outlet arrangement from the separation tank and directed to an initial treatment line. One or more de-oiling polymers are added to the oily water in the initial treatment line and mixed therewith. The mixture may then be directed to the dissolved air flotation unit where dissolved air is released into the bottom of the mixture. The dissolved air adheres to suspended solids in the mixture and lifts them to the top surface as a froth. The froth is skimmed from the top surface of the mixture and collected. The de-frothed water is reused or directed to a filtration system where it is prepared for discharge. A clarifying tank may be included after the de-oiling polymers are added to further separate the oil and water. The oil is removed from the top surface by a weir while the water is directed to the filtration system and discharged.

The invention discloses a preparation method and application of rhamnolipid. In the method, the rhamnolipid is produced by using waste grease as carbon source, and utilizing the fermentation of pseudomonas aeruginosa; and with the combination of the defoaming effect of ethanol, the yield of the rhamnolipid can reach 35 to 50 g/L and the cost is about 25 to 40 percent lower than that of the conventional method. When the solution containing 20 to 500 mg/L of rhamnolipid is used for processing plant disease fungus, the ratio of inhibiting disease fungal mycelium growth and spore germination can reach 40 to 90 percent and the plant fungal diseases can be effectively inhibited; the solution containing 20 to 500 mg/L of rhamnolipid has an obvious effect of killing cockroaches and aphids; and in addition, when the rhamnolipid is used as an aid of pesticide, fertilizer and feed and a dehydrating agent of oil-contained sludge by replacing a chemical surface active agent, the effect is obvious.

The invention provides a novel process for comprehensively treating oily sludge of an oil field, which comprises processes for separating oil, water and sludge from the oily sludge. The process is characterized in that the processes for separating oil, water and sludge comprise a first process of fluidizing and pre-treating sludge, a second process of hardening and tempering the sludge, and a third process of mechanically separating the oily sludge; water separated through the processes can be used as process water to a circulating water recycling process; the separated cleaned oil enters an oil chamber of an oil-water separation device; and solid particles, namely the centrifuged sludge, are discharged through a screw conveyer. The process has the recovery ratio reaching 95 percent for recovering effluent oil to the utmost extent; and the treated sludge has water content less than 60 percent and oil content less than 2 percent, and can be used for underlaying a road of a well site or carrying out subsequent depth treatment. The process cyclically utilizes wastewater, prevents secondary pollution of sewage and slurry, and has large treatment capacity, wide treatment range, advanced technical proposal, high automatic degree, low operation cost, simple operation and clean production.

The present invention relates to a sludge dehydration process and its equipment. Said equipment includes a mechanical filter pressing device, an ultrasonic quality-improving device, a pressure synergistic electroosmosis dehydration device and an adsorption dehydration material device. The cathode of the pressure synergistic electroosmosis dehydration device is placed at one side of sludge dehydration device, and its anode is placed at another side of sludge. Said ultrasonic quality-improving device is mainly composed of three portions of ultrasonic generator, ultrasonic convertor and ultrasonic contact. Besides, said invention also provides its working principle and concrete operation method and steps.

The present invention relates to environment protecting technology, and is especially one kind of sludge drying treatment process. The present invention is one low-cost combined sludge drying and utilizing process integrating microwave technology, aerobic fermentation technology and heat pump drying technology. The present invention is suitable for treatment of different kinds of sludge, and the sludge product has wide applications, including use as organic fertilizer, use as the material for composite organic fertilizer and building material, use as fuel for incinerating garbage and heating boiler, etc.

A zero discharge process for separating sludge and salt from desulfurization wastewater includes a pretreatment process, a membrane treatment process and an evaporative crystallization process; in the pretreatment process, the desulfurization wastewater enters a raw water tank, an aeration fan introduces compressed air into the raw water tank, and the wastewater is lifted to first-stage reaction and clarification by a raw water pump; in the membrane treatment process, the incoming wastewater is first filtered by ultrafiltration, then enters a pH adjustment tank, and is pumped into a nanofiltration membrane separation system and a reverse osmosis membrane separation system; in the evaporative crystallization process, the incoming wastewater is first subjected to two-stage preheating, then enters a degasser, and finally enters an evaporative concentration system and a crystallization system.

The invention discloses a novel process for pyrolysis of solid wastes. According to the existing pyrolysis technology, the solid wastes with low calorific values and high moisture content are difficult to treat, and effects of being completely harmless, reduced and recycled cannot be achieved. The novel process provided by the invention comprises the following steps of: uniformly crushing the solid wastes by a crushing system and conveying the crushed solid wastes to a drying system to be dried; carrying out the pyrolysis in a pyrolysis system and treating a pyrolyzed product by a re-burning system to provide energy needed by the pyrolysis system; conveying high-temperature smoke into a residual heat boiler to generate saturated vapor with a temperature which is higher than 1000 DEG C; carrying out heat exchange on the vapor by a vapor-air heat exchanger; after raising the temperature of normal-temperature air, conveying the air into the vapor-air heat exchanger to carry out the heat exchange with output smoke of the residual heat boiler; conveying the hot air into the pyrolysis system and carrying out processes of cooling combustion smoke, de-acidifying and removing dust on the smoke of the residual heat boiler through an exhaust gas treatment system; receiving uncondensed gas in condensed odor vapor by the deodorization system, carrying out final treatment on the uncondensed gas and exhausting. According to the invention, the residual heat value of the high-moisture solid wastes is sufficiently utilized and the utilization is not limited by types of the solid wastes, so that the energy source and the operation cost are saved.

The invention discloses a method for processing waste slurry, comprising the following steps: firstly, a sand-stone segregation apparatus separates, washes and discharges the drill cuttings sand and stone in the slurry; the pH value of the remaining slurry is adjusted and the COD value thereof is reduced; the solid and the liquid are separated from each other in a way of composite flocculating; water solution is separated out from the solid in a way of mechanical drying; the dried solid isolate meets the relative standard so as to be processed in a way of stacking or land filling; finally the separated water solution is processed in a way of filtration and reverse osmosis so as to obtain fresh water which is recycled or discharged on the spot. The method can be carried out by matching with an unit device and make continuously impending treatment of the well drilling waste slurry during drilling synchronously with normal well drilling production so as to continuously process the efflux hazardous waste to meet the discharge standard with out loading in the well drilling of oil-gas field, change the prior traditional whole efflux curingprocess mode, and fills the gap of an environmentally friendly governing field of oil drilling in the domestic.

The invention provides a river surge silt d harmless and recycling treatment method. In the method, a dredger is utilized to suck silt, the silt is sent into a biochemical treatment pond from the ship through a silt transmission pipeline, compound enzyme is utilized to carry out bioremediation, gravels and sands with the particle size bigger than 1mm are filtered out by a primary hydrocyclone and a vibration screen, sands with the particle size of 0.075-1mm are filtered out by a secondary hydrocyclone and the vibration screen, powdery particles with the particle size of 0.025-0.075mm are filtered out by a third-level hydrocyclone and the vibration screen, powder particles are further separated out from outlet silt tail water through a sediment tower, sewage from the sediment tower is filtered by utilizing a fiber filter after flocculant is added into the sewage, and powdery particles are deposited from backflushing silt after being filtered by utilizing the sediment tower again, and the powdery particles are dehydrated by the third-level hydrocyclone and the vibration screen after entering a sludge pool and are cured by a curing agent after dehydration. The method has high resource utilization ratio, meets the requirements for the environmental protection, particularly carries out stage treatment on the silt, lowers the cost and enhances the efficiency.

The invention relates to a municipal sludge deep dehydration composite conditioner and a dehydration method, the composite conditioner accounting for 3-30% by dry basis weight of sludge is added for conditioning modification of domestic sewage treatment plant concentrated sludge with the moisture content of about 97% to improve sludge preliminary mechanical dehydration and subsequent electroosmosis dehydration ability; the moisture content of the preliminarily dehydrated conditioned modified sludge is reduced to 70-85%; the preliminarily dehydrated sludge directly enters into electroosmosis dehydration equipment for deep dehydration, the moisture content of the sludge is reduced to 40 to 60%, landfill disposal, thermal conversion, use as building materials and other treatment, dispose and resource utilization can be directly carried out. The method can realize the continuous operation of sludge dehydration, is high in treatment efficiency, can effectively reduce the bound water content of the sludge, is good in dehydration effect, and low in moisture content of deeply dehydrated sludge cake, and is suitable for a newly-constructed sewage treatment plant and design requirements of reconstruction, expansion and contingency plans of sludge dehydration treatment of a sewage treatment plant in the prior art.

Hydrophilic cationic copolymers of acrylamide are prepared as dispersions in a salt media. These polymers have high molecular weights and are readily activated by diluting in water. These polymers are useful flocculants for such applications as sludge dewatering, raw water clarification aids, emulsion breakers and waste water clarification aids.

A method of treating, in wastewater purification, sludge containing organic matter, divalent iron and phosphorus, in which the sludge that is treated is made to contain dissolved iron and phosphorus at a molar ratio Fe:P of above 1:1, the sludge is treated at 0-100° C. with an acid at a pH of 1-5 for dissolution of divalent iron and phosphorus from the sludge, the sludge is supplied with an oxidiser selected from hydrogen peroxide and percompounds, wherein divalent iron is oxidised by Fenton's reaction to trivalent iron, and (i) trivalent iron is precipitated as trivalent iron phosphate (ii) free radicals with a deodorisation and sanitation effect are formed by Fenton's reaction, the sludge is then dewatered at a pH of at most 7, and the aqueous solution obtained in dewatering is recirculated to the wastewater purification.

The present invention is oil-containing sludge treating process, which includes one concentrating treatment step, one flocculating and centrifugally dewatering step and one drying step. The settled and concentrated sludge is discharged to the concentrated sludge conveying pipeline while flocculant is added for mixing with the concentrated sludge to react, and the flocculated sludge is dewatered in a centrifugally dewatering machine and dried in a steam jetting sludge treating system, with the dried sludge being further utilized externally. The process includes also one odorous material fixing and eliminating step. The process has high treating effect, universality, no secondary pollution, capacity of recovering petroleum resource, low power consumption, low running cost and other advantages.

The invention discloses a sludge resource treatment apparatus and a sludge treatment method using the same. The apparatus comprises a collecting filter, a sludge conveying device, a waste heat drying column, a cyclone separator, a rotary kiln, a draught fan, an airheater, a gathering tank, a deodorizing tower, a gas-liquid separator and a chimney, wherein the sludge conveying device, the waste heat drying column, the cyclone separator, the draught fan, and the deodorizing tower are successively connected through pipelines. When the sludge is anhydrated by the sludge resource treatment apparatus, the sludge generated by a sewage treatment plant is treated with gravity settlement to filter free water, dried with waste heat from the rotary kiln in the waste heat drying column and enters intothe rotary kiln to realize drying or sintering of the sludge; stink, flue gas and water vapor generate during the process is guided into the deodorizing tower for treatment by the draught fan. The treatment apparatus of the present invention has a compact and stable structure, small land occupation, is convenient for maintenance, and can be prepared into container overlap to facilitate carrying and save space.