6results about How to "Less sludge" patented technology

This invention relates to the field of water treatment technology and provides a high-speed micro-sand sedimentation process device with sludge thickening function. It includes a coagulation tank, a sand injection tank, a flocculation tank, and a sedimentation tank. It also includes a reflux system: an internal reflux system comprising an internal reflux pipe with its opening at the bottom of the sedimentation tank, and a micro-sand reflux pump and a hydrocyclone connected to the internal reflux pipe; and an external reflux system comprising an external reflux pipe with a distribution trough and a micro-sand reflux pump connected to it, the micro-sand reflux pump being located on one side of the sedimentation tank. This invention fully utilizes the ballast effect of the micro-sand, causing the formed suspended solid flocs to settle rapidly. Through the external reflux system, some of the discharged sludge is reintroduced into the internal reflux system to achieve sludge thickening, greatly reducing the amount of sludge discharged from the entire system and significantly increasing the sludge concentration. This results in high sludge concentration, good effluent quality, small footprint, and low power consumption.

The invention discloses a preparation method and application of an organic silicon modified aluminum-zirconium / titanium bimetallic composite fluorine removal agent (CSAZ / CSAT), and belongs to the technical field of water treatment. Zirconium tetrachloride or diluted titanium tetrachloride is compounded with aluminum chloride to construct a bimetallic framework. Meanwhile, vinyltriethoxysilane (VTES) is introduced as an organic modifier, and heterogeneous copolymerization is carried out on an organic silicon hydrolysate and metal hydroxyl by controlling the dripping rate and the reaction temperature. According to the fluorine removal agent, by utilizing the bridging effect of organic silicon and the synergistic effect of double metals, the adsorption, complexation and net capture capacities on fluorine ions are remarkably enhanced. Experiments show that when the molar ratio of Al to Zr is 9: 1 (CSAZ) or the molar ratio of Al to Ti is 14: 1 (CSAT), the defluorination effect is optimal. When the agent is applied, the pH value does not need to be adjusted, a coagulant aid does not need to be added, efficient removal of fluorine ions can be achieved only through a single agent, the agent has the advantages of being low in dosage, neutral in effluent pH value and the like, and the industrial problems that a traditional fluorine removal process is long in process, large in acid and alkali consumption and difficult in sludge treatment are effectively solved.

This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment system for industrial parks used to reduce pollutant emissions. The system includes an industrial wastewater treatment device and a domestic wastewater treatment device. The industrial wastewater treatment device includes, in sequence, an underground buffer tank, a demulsification reaction tank, a paper tape oil separator, a wastewater collection tank, a physicochemical flat-plate biological bed, a first dissolved air flotation tank, and a first sludge tank. The domestic wastewater treatment device includes, in sequence, a bar screen, an equalization tank, a domestic flat-plate biological bed, a second dissolved air flotation tank, and a second sludge tank. The first and second dissolved air flotation tanks are connected via pipelines and output as treated wastewater that meets emission standards. This system separates industrial and domestic wastewater treatment, specifically by converting the original MBR membrane tank into a flat-plate biological bed and the primary treatment tank into a flat-plate biological bed. Carbon removal / nitrification reactions are achieved through the biofilm carrier (packing material), improving the efficiency of organic matter degradation and reducing the COD, ammonia nitrogen, and sludge volume in the effluent.

This invention pertains to the field of pickling wastewater treatment in the steel industry. It discloses a method and system for the resource-based treatment of industrial wastewater containing fluoride and heavy metal ions. The method involves using sodium hydroxide to convert heavy metal and fluoride ions in the wastewater into hydroxides and fluoride complexes, which are then co-precipitated and separated from the aqueous phase. Sodium hydroxide is then used to convert the co-precipitated heavy metal and fluoride complexes into water-insoluble heavy metal hydroxides and water-soluble sodium fluoride. Calcium hydroxide is used to convert sodium fluoride in the water into calcium fluoride precipitate and water-soluble sodium hydroxide. The resulting NaOH aqueous solution is reused as part of the sodium hydroxide solution used in the preceding steps. Calcium hydroxide is then used to completely precipitate any remaining trace amounts of heavy metal and fluoride ions in the wastewater. The resulting wastewater then enters a biological treatment system for denitrification. This invention significantly reduces the amount of sodium hydroxide used and the amount of solid hazardous waste generated, alleviating the burden on biological treatment and lowering the overall cost of wastewater treatment.

The present application relates to wastewater treatment technical field, disclose a kind of processing method of inorganic fluorine-containing wastewater, comprising the following steps: the pH of inorganic fluorine-containing wastewater is adjusted to 2~4, calcium carbonate is loaded into carbide slag, and reaction is carried out;Coagulant is added to the wastewater after step S1 processing, coagulation and precipitation are carried out, and the precipitate is separated out.In the present application, the fluorine ion in wastewater is converted into calcium fluoride by using calcium carbonate loaded carbide slag, which can reduce the adhesion and wrapping of calcium fluoride on the surface of carbide slag, thereby achieving better wastewater defluorination effect under smaller carbide slag dosage, which is beneficial to reduce sludge amount.

The invention discloses a photovoltaic cell production wastewater perfluorine recovery process and a treatment system, concentrated alkaline water and dilute alkaline water are mixed, suspended solids, organic matters and particulate impurities are removed through a pretreatment system, fine particles are removed through an ultrafiltration membrane system, and then the mixture enters a nanofiltration membrane system to intercept silicon and other ions with more than two valence, so that the perfluorine recovery process is realized. Water produced by the nanofiltration membrane system enters a neutralization adjusting tank to be neutralized with part of dilute acid water until the pH is 5-8, fine particles in the solution are removed through a first precision filter, fluoride is intercepted through a two-stage RO membrane, and a concentrated sodium fluoride solution is obtained; sodium fluoride solution concentrated acid water and residual dilute acid water are mixed and then subjected to a crystallization reaction with a lime solution and a calcium chloride solution in a fluorine recovery and crystallization reactor to obtain a calcium fluoride crystal product, and effluent of the fluorine recovery and crystallization reactor enters a fluorine removal system and then is discharged after reaching the standard. 99% of fluorine elements are recycled as high-purity calcium fluoride, the sludge amount is small, and the medicament cost is very low.