The invention discloses a rapid treating method for rare earth radioactive wastewater. The method comprises the steps that a compound uranium removing agent and an oxidizing agent are added into radioactive wastewater with the pH of 3-7, residual organic extraction agent in rare earth extraction wastewater is efficiently oxidized through the synergistic effect of the compound uranium removing agent and the oxidizing agent, the complexing state of the extraction agent and uranium is damaged, uranium is combined with the compound uranium removing agent to generate a stable compound so as to achieve removal, the compound uranium removing agent can form loose floc in wastewater, and the floc has the strong adsorption ability on residual other radioactive elements such as thorium in water, so that radioactive elements and heavy metal ions in water are rapidly removed, deep removal of radioactive elements is achieved, the drained out can stably reach the limiting value of emission standards of radioactive elements and heavy metal in Rare Earth Industrial Pollutant Emission Standards (GB26451-2011), a new path is developed for rapid deep treatment of radioactive wastewater, and the application prospect is quite good.

Rapid treating method for rare earth radioactive wastewater

The invention relates to a comprehensive treatment process for oil shale destructive distillation wastewater, and belongs to the technical field of wastewater treatment. According to the comprehensive treatment process, by virtue of the characteristics that oil shale destructive distillation wastewater is high in oil content, high in ammonia nitrogen content, rich in refractory organism and the like, wastewater is firstly treated with cooling gravity oil removal and air floating to remove most suspended solids and oils; most ammonia nitrogen is further removed by using a rectification ammonia process; pretreated wastewater is further fed into a biochemical system; the biochemical system comprises an adjusting tank, an anaerobic pool, an anoxic pond and an aerobic tank; most organic pollutants are removed at a biochemical treatment stage; refractory pollutants are further removed through coagulation, filtration and ozonation; and finally the wastewater is recycled after being treated by using a membrane desalting system. The comprehensive treatment process for oil shale destructive distillation wastewater, which is provided by the invention, has the characteristics of being good in process applicability, good in desorption effect and good in impact resistance, and has good market prospects.

Comprehensive treatment process for oil shale destructive distillation wastewater

The invention relates to a method for recycling shale gas wastewater, and belongs to the technical field of industrial wastewater treatment. The technical problem to be solved by the invention is to provide a method for recycling shale gas wastewater, wherein the method is simple in process. According to the method, after the pH value of shale gas wastewater is adjusted, treatment is performed through ferrate oxidation and coagulation, a biological activated carbon filter tank, ultrafiltration and reverse osmosis, and all the steps are mutually influenced and complemented, so that the qualityof the effluent treated by the method can reach the first-grade standard of the national Integrated Wastewater Discharge Standard (GB8978-1996) and Standards for irrigation water quality (GB5084-2005). The process flow is simple and can adapt to variable water quality.

Method for recycling shale gas wastewater

The invention provides a preparation method for a multi-component loaded catalyst. The preparation method comprises the following steps: subjecting a carrier to heat treatment at a temperature of 150to 200 DEG C for 1 hour to 2 hours so as to obtain an activated carrier, wherein the carrier is fruit-shell active carbon or coal active carbon; loading a precursor onto the activated carrier in waterso as to obtain a precursor loaded carrier, wherein the precursor is selected from the group consisting of copper salt, nickel salt and manganese salt; drying the precursor loaded carrier so as to obtain a semi-finished product; and calcining the semi-finished product so as to obtain the multi-component loaded catalyst. The invention also provides the multi-component loaded catalyst and an application thereof. The multi-component loaded catalyst provided by the invention has high activity, is applied to ozone catalytic oxidation, and has high COD removal rate for a shale gas fracturing flow-back fluid. Meanwhile, the multi-component loaded catalyst has good stability and long service life. In addition, the preparation method for the multi-component loaded catalyst provided by the invention is simple and has low cost.

Multi-component loaded catalyst, and preparation method and application thereof

The invention provides a wastewater treatment technology by using magnetic transition metal particles to activate persulfate. The technology comprises the following steps: preparing the magnetic CoO/MnFe2O4 transition metal particles, pretreating high-salt volatile organic wastewater, pumping pretreated wastewater, an acid regulator and an alkali regulator into a pipeline mixer, mixing and then transporting to an evaporation reactor, feeding the persulfate and the magnetic CoO/MnFe2O4 transition metal particles into the evaporation reactor, activating the persulfate by using the CoO/MnFe2O4 transition metal particles to remove organic matters synchronously while evaporative desalination is performed, recycling the magnetic CoO/MnFe2O4 transition metal particles by passing concentrated water though a magnetic separator, rinsing the the magnetic CoO/MnFe2O4 transition metal particles, then circularly transporting into the evaporation reactor, and circularly using to activate the persulfate. According to the technology provided by the invention, the efficiency of removing organic pollutants in the synchronous desalination of the high-salt organic wastewater is improved, technological process of treating the high-salt organic wastewater is shortened, and the technology is an effective method for treating the high-salt organic wastewater.

Wastewater treatment technology by using magnetic transition metal particles to activate persulfate

The embodiment of the invention discloses a treatment method of shale gas fracturing flowback liquid.The method comprises the steps that when the pH value of the shale gas fracturing flowback liquid is 5-10, an inorganic coagulant is added to the shale gas fracturing flowback liquid, stirring is conducted, a first organic coagulant and a second organic coagulant are added, stirring is continuously conducted, standing settling is conducted, filtering is conducted, and coagulation supernatant and a coagulation sediment are obtained; the pH value of the coagulation supernatant is adjusted to be 7-9 and then introduced into a gradient ozone catalytic oxidation device for gradient ozone catalytic oxidation treatment; oxidized waste liquid is treated through a biological aerated filter treatment technology; biological treatment liquid is subjected to adsorption and filtration treatment and UV sterilization treatment and then discharged; the coagulation sediment is subjected to solid-liquid separation treatment, filtrate returns back to the step for circulation treatment, and a filter cake is subjected to solidification and stabilization treatment.By means of the treatment method of the shale gas fracturing flowback liquid, pollution of the shale gas fracturing flowback liquid is removed, the treated shale gas fracturing flowback liquid meets the emission standard, the filter cake can be backfilled or be used for paving after being treated, and resource utilization of waste materials is achieved.

Jiang Wei

Papers

Treatment method of shale gas fracturing flowback liquid