9 results about "Treated water sample" patented technology

The invention relates to the technical field of water quality monitoring, and discloses a DOC spectrum monitoring method and device. Comprising the following steps: pre-treating a water sample through a filtering device to eliminate the interference of turbidity on spectrum detection; conveying the pretreated water sample into a detachable flow cell, and collecting an ultraviolet spectrum of the water sample through an independently arranged light source spectrometer; determining a target characteristic wavelength subset from the ultraviolet spectrum; inputting the target characteristic wavelength subset into a pre-trained integrated meta-model to obtain a predicted value of the DOC concentration in the water sample; wherein the integrated meta-model is constructed by adopting a Stacking strategy and comprises a plurality of base models and a meta-model, and the meta-model is used for learning prediction results of the base models and performing fusion output; according to the monitoring system state or the preset maintenance period, before the flow cell is disassembled and maintained, the backwashing unit is triggered to execute the pre-cleaning operation, and the technical scheme is provided which gives consideration to the installation convenience, the monitoring accuracy and the operation stability.

The invention discloses a method for low-cost treatment of maleic anhydride wastewater through a Fenton oxidation reaction, and belongs to the technical field of chemical engineering. The method comprises the following steps: measuring the pH value of the maleic anhydride wastewater, controlling the temperature at 45-55 DEG C, adding liquid caustic soda under the condition, adjusting the pH value to 3-3.5, adding a certain amount of a ferrous sulfate solution into the maleic anhydride wastewater with the adjusted pH value, uniformly mixing, adding a certain amount of a hydrogen peroxide solution, uniformly stirring, carrying out a Fenton reaction, keeping the ORP at 250mV or above in the Fenton reaction process, and filtering to obtain the maleic anhydride wastewater. The COD (Chemical Oxygen Demand) of the maleic anhydride wastewater before treatment is controlled to be 40000-50000 mg / L, and the COD of the treated water sample is controlled to be 20000-35000mg / L. According to the method, the proportion of Fenton reagents and pH influence factors are explored, the proportion of ferrous sulfate and hydrogen peroxide is explored, the dosing relation between the dosing amount of liquid caustic soda and the physicochemical properties of maleic anhydride wastewater is explored, cost accounting and comparison are carried out on the theoretical dosing amount and the actual dosing amount, and the purpose of treating maleic anhydride wastewater at low cost is achieved.

This invention relates to the field of water treatment technology and discloses an intermittent electrocatalytic treatment method for trace estrogen in reclaimed water. The method is carried out in a three-dimensional electrode reactor. Before formal treatment, a pre-treated water sample containing the estrogen to be removed is used to pre-saturate the particle electrode. Subsequently, reclaimed water containing one or more estrogenic pollutants is continuously introduced into the reactor, operating at a current density of 1.0–10.0 mA / cm², a hydraulic retention time of 5–20 min, and an aeration rate of 0–3.0 L / min. An intermittent power supply mode with alternating power on and off is employed, wherein the ratio of power on time to power off time is 1:1, and the power off time is 2–120 s. During the power off phase, the estrogen to be removed accumulates on the surface of the particle electrode. During the power on phase, the particle electrode repolarizes to form a micro-battery and undergoes electrochemical oxidation in conjunction with the anode, causing direct oxidation and / or indirect oxidation mediated by an electrogenerated oxidant, while the particle electrode achieves in-situ regeneration. The method is applicable to the treatment of trace amounts of estrogens in reclaimed water, preferably one or more of estrone (E1), 17β-estradiol (E2), estriol (E3), 17α-ethinylestradiol (EE2), and bisphenol A (BPA). This invention can reduce the artificially inflated impact of adsorption on the evaluation of treatment effectiveness, and reduce energy consumption while ensuring treatment efficiency.

The utility model belongs to the technical field of environmental science, and particularly relates to a multi-channel automatic sampling system for measuring mercury in water, which is used for measuring mercury in water and comprises a plurality of sample bottles, a reagent bottle, an oxidation bottle, two multi-way valves, an injection pump, a reduction bottle, a mercury detector and a carrier gas system. The water sample of each sample bottle is connected by the first multi-way valve through a sample feeding pipe, and each reagent bottle and each oxidation bottle are connected by the second multi-way valve. The injection pump is connected with the second multi-way valve through the sampling pipe, and the sample outlet pipe feeds the mixture into the reduction bottle. The mercury detector is connected with the reduction bottle through a sample detection pipe, the carrier gas system is conveyed to the reduction bottle through a gas sample feeding pipe, a pre-treated water sample in the reduction bottle is purged, and reduced elemental mercury is brought out and enters the mercury detector. The system reliably realizes automatic sampling analysis and on-line monitoring of the total mercury and the form of the total mercury in water.

The invention relates to the technical field of data processing and water quality detection, and provides a signal processing method of a multi-parameter water quality analyzer and a related device, the method comprises the following steps: using a photoelectric detection module to obtain a first detection light signal generated when a to-be-treated water sample plate is subjected to laser irradiation; performing conversion processing on the first detection optical signal to obtain a first detection electric signal; optimizing the first detection electric signal to obtain a second detection electric signal; performing spectrum construction according to the second detection electric signal to obtain target spectrum information; and determining pollutant information of the to-be-treated water sample plate according to the target spectral information. By adopting the method provided by the invention, the accuracy of the signal processing process can be improved.

The invention provides a method for detecting biochemical oxygen demand in sewage, and belongs to the field of oxygen demand detection. The method comprises the following steps: forming a fluorine-containing organic silicon nano coating on the surface of an electrode of a dissolved oxygen sensor of a full-automatic BOD5 analyzer to obtain a fluorine-silicon modified dissolved oxygen sensor; the method comprises the following steps: pre-treating sewage to be detected in an adsorption column consisting of modified activated carbon and porous silica gel to obtain a pre-treated water sample; bacillus subtilis is fixed on a porous carrier and then put into the pretreated water sample, and an inoculated water sample is obtained; measuring the initial dissolved oxygen of the inoculated water sample and the final dissolved oxygen after five-day culture; and obtaining the five-day biochemical oxygen demand in the sewage according to the initial dissolved oxygen and the final dissolved oxygen. According to the application, through a four-stage collaborative system of sensor anti-interference optimization, sample purification and enrichment, microbial reaction standardization and accurate signal acquisition, error sources in traditional BOD5 detection are systematically eliminated, and accurate measurement of the organic matter pollution level in complex sewage is realized.

The invention discloses a liquid cathode glow discharge spectrum device and method for analyzing trace thallium. The device comprises a pretreatment unit, a separation and enrichment unit and a detection unit. The pretreatment unit is used for mixing a to-be-treated water sample with an oxidant and an acid solution to form a pretreated water sample; an enrichment column of the separation and enrichment unit comprises chelating resin, after the pretreated water sample enters the enrichment column, leacheate and an eluent are sequentially supplied to the enrichment column, and a water sample to be analyzed is obtained; and the detection unit receives the to-be-analyzed water sample for analysis and detection. According to the invention, high-selectivity chelate resin is used as an enrichment column filler, thallium ions in a pretreated water sample can be efficiently adsorbed, and other interfering ions can be separated; and after enrichment is completed, leacheate is supplied to the enrichment column, the pH environment of the enrichment column can be adjusted while interference ions are leached, and the thallium ions are effectively eluted under the assistance of a proper eluent, so that the interference problem of coexisting ions under a high-salt matrix is solved, the accuracy and sensitivity of analysis and detection are improved, and the device has the characteristics of miniaturization, low power consumption and high sensitivity.

This invention discloses a treatment process and system for residual organic wastewater from reverse flotation and subsequent desilication of demagnesium phosphate concentrate, belonging to the field of wastewater treatment technology. In the reverse flotation and subsequent desilication process of demagnesium phosphate concentrate, the filtrate from the desiliconized phosphate concentrate and tailings is collected and transported to a wastewater collection tank for mixing. An oxide mixture is added to the mixed wastewater and stirred until homogeneous. The mixture is then pumped sequentially into a two-stage series photo-ozone reactor to oxidize the organic matter in the wastewater. After the treated water sample meets the standards, it is returned to the phosphate rock flotation demagnesium removal process. The wastewater treatment system includes a wastewater collection tank, an oxide mixture addition tank, a mixing tank, a two-stage series photo-ozone reactor, and a qualified wastewater storage tower. This wastewater treatment process not only achieves efficient wastewater treatment without secondary pollution but also allows for reuse in the phosphate rock flotation demagnesium removal process, improving the practicality and stability of the wastewater treatment process and demonstrating promising application prospects.

The invention discloses a method for removing pollutants in a nanofiltration membrane concentrated solution through coagulating sedimentation and ultraviolet / heat synergistic activation of sodium persulfate, and belongs to the technical field of water pollution control. Aiming at a kitchen waste leachate nanofiltration membrane concentrated solution with large chroma, high salinity, high CODCr content, large change amplitude, high total nitrogen and total phosphorus content, low BOD5 and ammonia nitrogen content and low concentration of metal ions except magnesium, the invention discloses a treatment method combining coagulating sedimentation and an ultraviolet / thermal activation sodium persulfate advanced oxidation method. The method can effectively reduce TOC, TN, chromaticity and UV254 in a water sample and efficiently remove organic pollutants and coloring substances, the method shows excellent treatment capacity on TOC, chromaticity and other indexes, CODCr, BOD5, TN, ammonia nitrogen, TP and chromaticity indexes of the treated water sample can meet the emission standard, and the method is suitable for industrial production. And a reference technical strategy is provided for exploring a novel high-efficiency oxidation technology and deep purification of a membrane concentrated solution in the future.