Abstract: The present disclosure relates to equipment and method for water and stream purification using a pre-treatment and multi-layered media system which may effectively remove dissolved phosphorus, COD and organic matter by introducing a pre-treatment device to stably operate filter media and applying a strainer to each filter media to improve water permeating ability of the filter media.

Abstract: Provided are an apparatus and a method for river water purification using a treatment soil layer and a permeable filtering medium layer. The river water purification apparatus includes a treatment soil layer and a permeable filtering medium layer which are sequentially and alternately stacked. The treatment soil layer includes a plurality of unit soil layers which are arranged at intervals. A reservoir part which stores a predetermined amount of river water and supplies the river water to an inside of the unit soil layer is provided in an upper end part of the unit soil layer. The permeable filtering medium layer has a higher hydraulic conductivity than that of the treatment soil layer. The river water purification apparatus increases a treatment flux of river water regardless of a coefficient of water permeability of soil and effectively removes nitrogen, phosphorus and nutrient salts by stably forming an anaerobic condition.

Abstract: Disclosed are a device for treating nitrogen and phosphorus from wastewater, including: an algal culture tank for culturing microalgae capable of treating nitrogen and phosphorus from wastewater; and a separation membrane for separating thus treated water from the microalgae, and a method for the same. According to the disclosed device and method, microalgae are cultured at high concentrations using wastewater, instead of an artificial culture medium, as a culture medium. As a result, nitrogen and phosphorus can be effectively treated from the wastewater, and the microalgae, which are useful as a biomass, may be cultured and recovered stably.

Abstract: Provided are an apparatus and a method for river water purification using a treatment soil layer and a permeable filtering medium layer. The river water purification apparatus includes a treatment soil layer and a permeable filtering medium layer which are sequentially and alternately stacked. The treatment soil layer includes a plurality of unit soil layers which are arranged at intervals. A reservoir part which stores a predetermined amount of river water and supplies the river water to an inside of the unit soil layer is provided in an upper end part of the unit soil layer. The permeable filtering medium layer has a higher hydraulic conductivity than that of the treatment soil layer. The river water purification apparatus increases a treatment flux of river water regardless of a coefficient of water permeability of soil and effectively removes nitrogen, phosphorus and nutrient salts by stably forming an anaerobic condition.

Abstract: Provided is a method for detecting a membrane module flaw, including: preparing fluorescent particles having a size of 0.5 to 1.5 ?m using silica; injecting the fluorescent particles in a concentration of greater than 0 mg/mL and less than 0.1 mg/mL or equal into a membrane module used in a sewage and wastewater treatment process; operating a pump to apply a pressure such that the fluorescent particles injected into the membrane module leak to the outside of the membrane module, in case that the membrane module has a flaw; acquiring a digital image of the membrane module; and discriminating a colored portion from a non-colored portion in the digital image.

Abstract: Disclosed are a membrane coupled activated sludge method and apparatus operating anoxic/anaerobic processes alternately for removal of nitrogen and phosporus, wherein nitrogen and phosphorous together with organics in the sewage, wastewater, filthy water etc. can be simultaneously removed with an economic and efficient manner, an operation thereof is easy and efficient, a capacity thereof is high and the method is economic due to the reduced operating costs with performing measurement and control of a recycle rate, a recycle time of alternate operation of the anoxic and anaerobic process, an amount of sludge, an amount of aeration and an operation of a blower for an intermittent membrane cleaning.

Abstract: The present invention relates to a water quality measurement system based on a high performance optical fiber probe, and more particularly relates to a water quality measurement system based on a high performance optical fiber probe that immerses an optical fiber prove inducing an ultraviolet light into contaminated water distant from the measurement device, irradiates the light, collects the reflected fluorescent lights, and quantifies the contamination level using a spectrometer thereby.

Abstract: An Intermittently Decanted Extended Aeration (IDEA) process characterized in that an aeration period, a settling period and a decanting period are successively repeated in that order in a single reactor, and influent wastewater is transversely supplied at the bottom of the reactor and slowly diffused in the reactor while treated wastewater wich is intermittently discharged during the decanting period is provided. According to the process of the invention, wastewater can be efficiently treated without by-pass of wastewater under dry weather and wet weather conditions as well as stormy weather condition.

Abstract: A water treatment method using a hollow fiber membrane and an apparatus therefor are provided, and particularly, a direct-suction filtration method is used to enhance the water treatment efficiency, and the pollutants attached to the hollow fiber membrane are removed by a direction-convertible stirrer placed in the water tank containing the hollow fiber membrane to thereby extend the life of the membrane.

Abstract: The present invention describes a method for preparing an asymmetric porous membrane by a dry-wet phase inversion method, which comprises contacting a cast or spun polymer solution with water or organic vapor prior to immersing into the non-solvent precipitation medium, whereby said water or organic vapor is adsorbed onto the cast or spun polymer solution. Higher permeability and excellent rejection ability can be obtained, due to the high porosity and uniform pore size of said membranes according to the present invention.

Abstract: A method and a device for simultaneously measuring the flow speed and the depth of a river is provided. The method and the device use ultrasonic wave to measure average flow speeds at a plurality of points in the water flow of a river to measure the flow rate of the river. The device comprises a vertical rod (7), and inclined rod (9), a vertical rod cylinder (8) movable up and down along the vertical rod, an inclined rod cylinder (10), through which the inclined rod can move, installed at an axis fixed perpendicular to the vertical rod cylinder (8), an angle sensor (15) measuring the angle between the vertical rod (7) and the inclined rod (9), support rods (14) installed at said axis and the ends of the vertical rod and the inclined rod (9) opposite to said axis, ultrasonic vibrators (4, 4', 6, 6') installed at the ends of said support rods (14) spaced from the vertical rod and the inclined rod, a level (11) attached to the top of the vertical rod (7), and a calculating part (16).