Abstract: A circuit comprises: a sampling and holding circuit and a control circuit. The sampling and holding circuit is used for sampling the voltage of a voltage sampling point in a sampling stage and holding the sampling voltage of the sampling output end after the sampling stage is ended. The control circuit is used for controlling the sampling and holding circuit to enter the sampling stage when judging that the voltage of the voltage sampling point is in a sampling voltage segment according to the voltage of the voltage sampling point, and controlling the sampling stage of the sampling and holding circuit to be ended when judging that the voltage of the voltage sampling point is in a voltage inflection point according to the voltage of the voltage sampling point and the sampling voltage of the sampling output end.

Abstract: A switching power source includes: a dimmer connected to an alternating current power supply and having a plurality of operating modes; a filtering/rectifying module connected to the dimmer to filter an alternating current output from the dimmer to obtain a filtered alternating current and rectify the filtered alternating current into a direct current; a dimmer switching module connected to the dimmer; a control module connected to the filtering/rectifying module and the dimmer switching module, respectively, and configured to detect a current operating mode of the dimmer when the switching power source is powered on, generate a dimmer control signal according to the current operating mode, and control the dimmer switching module to turn on or off according to the dimmer control signal to control the dimmer to enter an operating mode; and a primary constant current circuit connected to the control module and the filtering and rectifying module.

Abstract: A switching power source includes: a dimmer connected to an alternating current power supply and having a plurality of operating modes; a filtering/rectifying module connected to the dimmer to filter an alternating current output from the dimmer to obtain a filtered alternating current and rectify the filtered alternating current into a direct current; a dimmer switching module connected to the dimmer; a control module connected to the filtering/rectifying module and the dimmer switching module, respectively, and configured to detect a current operating mode of the dimmer when the switching power source is powered on, generate a dimmer control signal according to the current operating mode, and control the dimmer switching module to turn on or off according to the dimmer control signal to control the dimmer to enter an operating mode; and a primary constant current circuit connected to the control module and the filtering and rectifying module.

Abstract: A method for treatment of sludge with a facultative-organism-adapted membrane bioreactor by providing a sludge treatment system comprising a facultative digestion tank, a membrane module, an aeration system, a sludge pump, and a drainage pump, pumping sludge into the facultative digestion tank via the sludge pump and allowing for digestion, synchronously aerating and scouring the membrane module by the aeration system, pumping the sludge by the drainage pump and filtrating by the membrane module so that sludge and water are separated, and draining the water via the drainage pump. The method can digest sludge completely in the digestion tank, and solves problems existing in conventional sludge treatment methods such as large investment and high transportation cost, even achieves a subject of zero discharge of sludge.

Abstract: A jet aeration apparatus for aerating a membrane bioreactor has a jet aerator and an air supply pipe. The jet aerator is disposed in the membrane bioreactor and includes a water inlet, a pump disposed below a liquid surface of the membrane bioreactor, an air inlet pipe whose air inlet is disposed above the liquid surface of the membrane bioreactor, and a jet pipe having a jet nozzle. The air supply pipe includes a connector; and the connector of the air supply pipe is connected to the jet nozzle of the jet pipe of the jet aerator. A method of using the jet aeration apparatus is also provided. The jet aeration apparatus is easy to install, quiet in operation, and features a high degree of integration.

Abstract: A method for forming a facultative-organism-adapted membrane bioreactor by: providing a membrane bioreactor having a membrane module, aerating intensively the membrane module at a lower part thereof and maintaining the scouring against the membrane module so that an aerobic environment is formed at a middle and lower part of the membrane module, and controlling aeration intensity so that a facultative or anaerobic environment is formed around the membrane module excluding the middle and lower part thereof. The a facultative-organism-adapted membrane bioreactorformed by the method has low energy consumption, low sludge yield coefficient, and high efficiency of nitrogen and phosphorus removal.

Abstract: A portable water purifier having a shell, a solar cell, a power storage system, a micro booster pump, and a membrane module. The solar cell is disposed on the shell. The power storage system, the micro booster pump, and the membrane module are disposed integratedly in the shell. The solar cell is connected to the power storage system and the combination thereof provides power for the micro booster pump. The micro booster pump is connected to the membrane module. A method of purifying water with the portable water purifier is also taught. The portable water purifier can produce instant safe, and healthy drinking water even when power supply is lacking.

Abstract: A method for forming a facultative-organism-adapted membrane bioreactor by: providing a membrane bioreactor having a membrane module, aerating intensively the membrane module at a lower part thereof and maintaining the scouring against the membrane module so that an aerobic environment is formed at a middle and lower part of the membrane module, and controlling aeration intensity so that a facultative or anaerobic environment is formed around the membrane module excluding the middle and lower part thereof. The a facultative-organism-adapted membrane bioreactorformed by the method has low energy consumption, low sludge yield coefficient, and high efficiency of nitrogen and phosphorus removal.

Abstract: A method for treatment of sludge with a facultative-organism-adapted membrane bioreactor by providing a sludge treatment system comprising a facultative digestion tank, a membrane module, an aeration system, a sludge pump, and a drainage pump, pumping sludge into the facultative digestion tank via the sludge pump and allowing for digestion, synchronously aerating and scouring the membrane module by the aeration system, pumping the sludge by the drainage pump and filtrating by the membrane module so that sludge and water are separated, and draining the water via the drainage pump. The method can digest sludge completely in the digestion tank, and solves problems existing in conventional sludge treatment methods such as large investment and high transportation cost, even achieves a subject of zero discharge of sludge.

Abstract: A jet aeration apparatus for aerating a membrane bioreactor has a jet aerator and an air supply pipe. The jet aerator is disposed in the membrane bioreactor and includes a water inlet, a pump disposed below a liquid surface of the membrane bioreactor, an air inlet pipe whose air inlet is disposed above the liquid surface of the membrane bioreactor, and a jet pipe having a jet nozzle. The air supply pipe includes a connector; and the connector of the air supply pipe is connected to the jet nozzle of the jet pipe of the jet aerator. A method of using the jet aeration apparatus is also provided. The jet aeration apparatus is easy to install, quiet in operation, and features a high degree of integration.