A flue gas cleaning solution purification system includes: a scrubber for removing contaminants from flue gas by using a cleaning solution; a cleaning solution purification unit for purifying the contaminated cleaning solution discharged from the scrubber; a cleaning solution resupply unit for resupplying the cleaning solution having been purified by the cleaning solution purification unit to the scrubber; and a sludge treatment unit for treating and storing sludge discharged from the cleaning solution purification unit, wherein the cleaning solution purification unit includes: a circulation buffer tank for temporarily storing the discharged contaminated cleaning solution; a coagulant supply apparatus for supplying a coagulant which coagulates contaminants of the contaminated cleaning solution discharged from the scrubber; a settling apparatus for primarily purifying the contaminated cleaning solution discharged from the scrubber by enabling settling of the contaminants; and a filtering apparatus for secondarily purifying the cleaning solution by filtering the contaminated cleaning solution to remove the contaminants.

A method and a system for purification of oil, said method comprising the steps of: —providing separation aid and oil to be purified to at least one sedimentation tank; —waiting for allowing a sludge phase to sediment to a bottom part of the sedimentation tank, said sludge phase comprising the separation aid together with impurities from the oil; —removing an oil phase not comprising said sludge phase from the at least one sedimentation tank; and —filtering said oil phase through a depth filter for removing any possible remaining separation aid and impurities.

A method and a system for purification of oil, said method comprising the steps of: —providing separation aid and oil to be purified to at least one sedimentation tank; —waiting for allowing a sludge phase to sediment to a bottom part of the sedimentation tank, said sludge phase comprising the separation aid together with impurities from the oil; —removing an oil phase not comprising said sludge phase from the at least one sedimentation tank; and —filtering said oil phase through a depth filter for removing any possible remaining separation aid and impurities.

A method and a system for purification of contaminated oil. Said method comprises the steps of: —providing contaminated oil and a separation aid in a tank (3); —waiting for allowing a sludge phase comprising the separation aid together with impurities from the oil to settle in a bottom part (4) of the tank (3); —reusing the sludge phase for purification of new contaminated oil.

A method and a system for purification of contaminated oil. Said method comprises the steps of: —providing contaminated oil and a separation aid in a tank (3); —waiting for allowing a sludge phase comprising the separation aid together with impurities from the oil to settle in a bottom part (4) of the tank (3); —reusing the sludge phase for purification of new contaminated oil.

A cleaning apparatus is used with a slug catcher for a pipeline upstream of a process. An inlet of the catcher separates liquid and gas of the flow, and a gas outlet outputs the gas. Tubes of the catcher extend below the inlet to collect the liquid in a liquid outlet for output to the process. An actuator of the apparatus has a mover disposed internal to a portion of the liquid outlet. Movable with the actuator, the mover moves any debris relative to at least one outlet port of the liquid outlet. For example, a motor can rotate a feed screw in a sludge manifold to move a paddle for scrubbing debris to an outlet in the manifold. In another example, a motor can rotate an auger in the sludge manifold to move debris to the manifold's outlet. The apparatus can be manually or automatically operated.

The invention provides a method and a system for measuring suspended solids in wastewater, including: introducing an aqueous sample into a measurement system, comprising at least one length of tubing; pumping, using a pump, the aqueous sample through the at least one length of tubing; and measuring, using at least one optical sensor, a quantity of suspended solids in the aqueous sample wherein at least one optical sensor is coupled to the length of tubing in a position to measure the quantity of suspended solids while the aqueous sample is located in the at least one length of tubing.

A settler for decanting mineral slurries includes a tank having a side wall, a bottom and a top, an outlet for a thickened slurry at the bottom of the tank, a first overflow outlet for withdrawing an overflow stream of a clarified liquid, a slurry inlet means for introducing fresh slurry into the tank, the slurry inlet means having a slurry opening through which fresh slurry joins a body of slurry in the tank, and a stirrer having a vertical axis around which the stirrer rotates or reciprocates, in said settler the slurry opening is displaced laterally relative to said vertical axis of the stirrer and said slurry inlet means comprises mixing means. A separation installation includes the above settler and a method for separating a clarified liquid from a thickened slurry of a mineral slurry.

A settler for decanting mineral slurries includes a tank having a side wall, a bottom and a top, an outlet for a thickened slurry at the bottom of the tank, a first overflow outlet for withdrawing an overflow stream of a clarified liquid, a slurry inlet means for introducing fresh slurry into the tank, the slurry inlet means having a slurry opening through which fresh slurry joins a body of slurry in the tank, and a stirrer having a vertical axis around which the stirrer rotates or reciprocates, in said settler the slurry opening is displaced laterally relative to said vertical axis of the stirrer and said slurry inlet means comprises mixing means. A separation installation includes the above settler and a method for separating a clarified liquid from a thickened slurry of a mineral slurry.

A deep cone thickener with an underflow concentration rapid auto-adjustment pertains to the technical field of mining tailing disposal. The thickener includes a shell body, a dilution flocculation system, a shearing dewatering system, an underflow circulatory system, and an auto-control system. The shell body includes a thickener pool wall, a cone body, and a collection cylinder. The dilution flocculation system includes a feed pipe, a flocculant charging pipe, and a central feed well. The shearing dewatering system includes a drive motor, a drive shaft, and a rake. The underflow circulatory system includes discharging valves, underflow pumps, circulatory pipes, and a concentration meter. The auto-control system includes a PLC control system. During the underground paste filling, the dilution flocculation system and shearing dewatering system can form a paste slurry. When there is no need for underground backfill, the underflow circulatory system is used to lower the underflow concentration rapidly.