40 results about "Mercury level" patented technology

A method of reducing mercury levels in a mercury contaminated material using microwave energy. The method comprises the steps of (a) placing the mercury contaminated material in a microwave reactor; (b) providing a stream of gas in the microwave reactor, the stream causing agitation of the mercury contaminated material; and (c) exposing the mercury contaminated material to microwave radiation so as to raise the temperature to at least 357° C., producing a vapour phase which contains mercury and a treated material. The method also allows for a simultaneous reduction of mercury and carbon levels in the material to be treated as well as the use of a carbon-free material in the reactor.

A marine warning sign, in the shape of a right prism, having a frame forming a square of other polygonal shaped enclosure with straight sides and open front and rear faces. In the front face is positioned an assembly comprised of a transparent panel under which is a graphics panel. On the obverse face of the graphics panel is printed some desired warning indicia. A rear panel enclosed the rear face of the frame. A border, in the same shape as the frame, surrounds the indicia. The border is formed of electroluminescent tape. The electroluminescent tape illuminates when energized by an electrical power control located within the sign. The electrical power control is powered by a rechargeable battery which powers an a/c to d/c inverter. The electrical power control is switched on and off during night and day, respectively, by a circuit in the electrical power control comprised of a comparator having a bridge circuit with a photoresistor as one input. Mercury level switches also are provided to disable the electrical power control if the sign is tilted from its desired level attitude. The inverter provides alternating current to two leads of the electroluminescent tape, causing the electroluminescent tape to illuminate.

The invention discloses a smoke mercury emission monitoring system and method. The smoke mercury emission monitoring system comprises a sampling device, a pre-processing device and a mercury monitoring device, wherein the sampling device is used for collecting smoke when the system works; the pre-processing device comprises a catalytic reactor which is used for converting mercury in an oxidation state to the mercury in an element state; the mercury monitoring device comprises an ultraviolet light source, a measuring cell and a mercury analyzer; the measuring cell is used for absorbing ultraviolet lights through the pro-processed smoke; and the mercury analyzer is used for recording the absorbance of the absorption and calculating a concentration of the mercury according to the absorbance. According to the smoke mercury emission monitoring system disclosed by the invention, the mercury content in the smoke is directly monitored by using an ultraviolet absorption spectrum without a mercury gathering unit. The smoke mercury emission monitoring system has a fast measurement speed and can be used for continuously monitoring in real time in true sense.

Trace element levels of mercury in crude oil are reduced by first passing the crude oil through a filtration device to generate filtered crude having a reduced concentration of mercury and a reject stream having a concentrated mercury level. In one embodiment, the filtration device is back-flushed to generate the reject stream. In another embodiment, the reject stream comprises a portion of the retentate from a cross-flow filter device. The reject stream is treated with an extractive agent selected from tetrakis(hydroxymethyl)phosphonium sulfate; tetrakis(hydroxymethyl) phosphonium chloride; an oxidizing agent; an organic or inorganic sulfidic compound to extract a portion of the mercury into a water phase for subsequent removal. In one embodiment, the extractive agent is a reductant to convert non-volatile mercury into volatile mercury.

A device and method for determining mercury levels in a biological sample containing mercury. The biological sample is at least partially dissolved in an acidic solution to release at least a portion of the mercury contained therein. The partially dissolved biological sample is exposed to an anode and cathode under an electromotive force causing at least a portion of the mercury released from the biological sample to adhere to a surface of the cathode. The cathode being exposed to an alkaline metal salt to create a mercury-alkaline metal amalgam. This cathode is then electrically connected to a reference electrode whereby the extent of the amalgam is a measure of the level of mercury in the biological sample.

The invention discloses a device and method for controlling the addition amount of a mercury removal agent for mercury-containing wastewater treatment, and the device mainly comprises a neutralization reaction tank, one side of the neutralization reaction tank is provided with a waste acid liquid inlet and a waste alkali liquid inlet, the other side of the neutralization reaction tank is provided with a liquid outlet, and the liquid outlet is connected with the input end of an integrated mercury removal device through a pipeline and a pump body; a mercury removal agent adding opening and a motor are mounted above the neutralization reaction tank, and the motor is connected with a stirring assembly. According to the device and method for controlling the addition amount of the mercury removal agent for mercury-containing wastewater treatment, the addition amount of the mercury removal agent is reasonably controlled under the condition that the mercury content of mercury-containing wastewater is not analyzed, and the purpose of effective mercury removal is achieved.

The invention relates to a method for detecting total mercury in an energy saving lamp, comprising the following steps of: preparing a digestion solution containing BrCl and nitric acid; adding the digestion solution into a plastic bottle, uniformly mixing, and putting a plurality of ceramic or glass beads with a certain diameter into the bottle; putting an energy saving lamp, the lamp holder and electronic components of which are removed, into the plastic bottle filled with the digestion solution, and tightening the bottle cap up; shaking the plastic bottle and breaking the lamp; allowing the mercury to be completely absorbed; detecting the mercury content after constant volume, and converting into the total amount of mercury in the lamp. The method is to break and digest the whole lamp in the sealed plastic bottle so as to prevent the leakage of mercury steam, and simultaneously is suitable for amalgam lamps and liquid mercury lamps. In addition, the analysis flow is simplified, and the digestion solution volume, and the sample volume and the constant volume are accurately controlled during the experimental process. Therefore, the concentration value of mercury in the solution measured by the device equals to the content of the total mercury in the lamp, and a tedious calculation step is avoided.

The invention belongs to the field of coal-fired flue gas mercury content measurement, and particularly relates to a device for measuring the total concentration of multivalent mercury in coal-fired flue gas. The device comprises a gas-solid separation system, a carrier gas flow control system, an oxidation-state mercury conversion system, a granular-state mercury conversion system and a mercury concentration measurement system. The gas-solid separation system is connected with the oxidation-state mercury conversion system and the granular-state mercury conversion system, the gas-solid separation system separates gas and solid in flue gas, the gas enters the oxidation-state mercury conversion system, and the solid enters the granular-state mercury conversion system. The carrier gas flow control system is connected with the granular-state mercury conversion system and is used for carrying particles and controlling the carrier gas flow to be the same as the flue gas flow. The mercury concentration measurement system is connected with the oxidation-state mercury conversion system and the granular-state mercury conversion system, and is used for measuring and recording the mercury concentrations in the two systems. According to the measuring device, the concentration of mercury in the coal-fired flue gas can be directly measured, the flue gas sampling process is omitted, the systemprocess can be simplified, and the cost is reduced.

The invention discloses a natural gas sample collection method for natural gas mercury content detection. The natural gas sample collection method comprises the steps of mounting a sampling device fornatural gas sample collection for natural gas mercury content detection on a to-be-detected natural gas pipeline; limiting the flow velocity on the pipeline of the sampling device; emptying the gas in the collecting device, and emptying a container for collecting the natural gas sample; opening a control valve on the main pipeline to enable the natural gas to flow into the collecting container, and collecting to obtain a natural gas sample for detecting the mercury content of the natural gas. According to the method, in the process of collecting the natural gas sample for detecting the mercury content of the natural gas, the collecting device can be emptied, so that residual air or impurities in the pipeline and the collecting container are avoided, and the influence on the accuracy of adetection result of the mercury content in the natural gas is prevented.

The invention relates to the technical field of environmental monitoring, in particular to a nanogold enrichment tube and a preparation method thereof, and a device and a method for sampling mercury in flue gas. The nanogold enrichment tube prepared by the preparation method has the advantages of large specific surface area, strong adsorption activity, high repeated utilization rate and the like, and can complete efficient enrichment of mercury in a short time. According to the sampling device adopting the nanogold enrichment tube and the corresponding sampling method, the content of the particulate mercury is measured by separating and capturing the particulate mercury and the gaseous mercury in the flue gas; and by utilizing the trapping capability of the nanogold on the gaseous mercury, the content of the gaseous mercury in the flue gas is accurately sampled and measured.