A sludge treatment system, comprising a pump (1), an ozone generation device, an ejector (2) and pipe reactors (3). The pump (1), the ozone generation device, the ejector (2) and the pipe reactors (3) are sequentially connected by pipes. An oxygen generator (4) and an ozone machine (5) are arranged within the ozone generation device, and are connected by a pipe. The ozone generation device is used for providing ozone into the pipe reactors (3). The inner surfaces of the pipe reactors (3) are coated with a catalyst layer used for increasing the oxidative capacity of the ozone on the sludge. Spiral fin plates (6) allowing a fluid to generate a spiral flow are arranged within the pipe reactors (3). Also disclosed is a sludge treatment method using the present sludge treatment system. The present system has a high ozone utilization rate, and a low ozone input proportion.

A water treatment system includes a water mixing unit adapted to promote water turbulence, an input line having an upstream end adapted to be in fluid communication with a body of water to be treated, and a downstream end in fluid communication with the water mixing unit. The system includes an ozone injector adapted to be connected in fluid communication with an ozone gas generation system. A branching line is in fluid communication with the input line and the ozone injector and an ozone supply line is in fluid communication with the ozone injector and the input line. A bypass control valve is in fluid communication with the ozone supply line and the water input line and is adapted to be selectively switched between an open position and a closed position, wherein water is prevented from flowing through the branching line and the ozone supply line when the bypass control valve is in the closed position.

A wastewater treatment system including a facultative-organism-adapted membrane bioreactor. The facultative-organism-adapted membrane bioreactor includes a reaction vessel, a membrane separation system, a water production system and an aeration system. The membrane separation system is disposed in the reaction vessel. The water production system communicates with the membrane separation system to pump a filtrate out of the membrane separation system. A wastewater treatment method using the facultative-organism-adapted membrane bioreactor includes: aerating the reaction vessel to enable a dissolved oxygen concentration in over 50% of the reaction vessel is smaller than 1 mg/L, a dissolved oxygen concentration in the membrane separation system is smaller than 2.0 mg/L, and a dissolved oxygen concentration in the reaction vessel excluding the membrane separation system to be greater than 0 and smaller than 1.0 mg/L.

A method for wastewater treatment having a zero discharge of sludge, the method including: a) providing a membrane bioreactor system including a membrane separation system and a reaction vessel; and b) aerating the membrane separation system and the reaction vessel to control the dissolved oxygen concentration around the membrane separation system to be greater than 0 and smaller than 2 mg/L and the dissolved oxygen concentration in the reaction vessel excluding the membrane separation system to be greater than 0 and smaller than 1 mg/L. A wastewater treatment system having a zero discharge of sludge includes a membrane bioreactor system including: a reaction vessel, a membrane separation system, a water production system, and an aeration system.

A water treatment system includes a plurality of tanks; a plurality of blow systems connected to tanks respectively; a blower unit configured to supply air to tanks through the air blow systems; and a control device configured to: calculate a pressure loss in each of the air blow systems; and control supply of water to be treated to each of the tanks, according to the calculated pressure losses.

Membrane filtration systems can be used to purify liquid streams for downstream use. In practice, foulant can build-up on the surface of a membrane within a filtration system over time. The effectiveness of the filtration system will deteriorate if the fouling is not properly controlled. In some examples, a method of controlling membrane fouling in a pressurized membrane system involves supplying a feed stream that is predominately air mixed with water to the membrane. In other words, the feed stream a greater volume of air than water, even though it is the water being processed by the membrane. Supplying the pressurized membrane system with a feed stream that contains a greater volume of air than water can yield significantly better performance than supplying the membrane with a feed stream that contains a greater volume of water than air.

A produced water evaporation system for spray evaporating water comprising a geothermal heat retainment system and an evaporation system is disclosed. The geothermal heat retainment system comprises a first feed inlet, an optional solar collection system or a heat exchanger, and a first discharge outlet. The evaporation system comprises a second feed inlet, a pump, a drip manifold comprising a drip orifice or a manifold comprising a nozzle, a container, wherein a first portion of a ceiling of the container is constituted by a demister element such that the first portion of the ceiling is entirely configured as an outlet for evaporated water and wherein a second portion of the ceiling is adjacent to an upper edge of a wall of the container, a second discharge outlet, and an air system comprising an air blower and an optional air preheater, wherein the air system is disposed through the wall of the container and wherein the air system discharges air flow counter to the produced water and/or water droplets from the drip orifice. A method of using the produced water evaporation system is also disclosed.

This disclosure includes systems and methods for optimizing aeration in wastewater treatment. The techniques described herein include receiving data for a wastewater treatment plant, the data being descriptive of water quality over a period of time. The techniques further include developing a predictive model for future water quality based on the received data. The techniques also include determining, based on the predictive model, a plurality of DO setpoints and airflow rates for the wastewater treatment plant. The techniques further include controlling an aeration system for the wastewater treatment plant using the plurality of DO setpoints and the airflow rates.

A system for high-value utilization of organic solid waste includes an anaerobic digestion unit, a biogas measurement and collection unit and a methane purification and liquefaction unit. The anaerobic digestion unit includes an organic solid waste pretreatment system and an anaerobic digestion device. The biogas measurement and collection unit includes a gas flow meter and a high-pressure biogas collection device. The methane purification and liquefaction unit includes a high-pressure separation tank, a liquefaction pretreatment system, a heavy hydrocarbon and benzene removal device, a two-stage rectification system, a low-temperature pressure liquid storage tank device and a buffer storage tank. The organic solid waste undergoes an anaerobic digestion treatment to produce methane followed by collection, purification and liquefaction.

An aeration balance controller in a wastewater treatment process allows for precise control of aeration medium in situations where the oxygen concentration must be controlled in more than one aeration zone or compartment, with reduced instrumentation. The system also has application controlling aeration media where the aeration of one or more zones may interfere with the stable control of aeration in another zone. This is accomplished by the use of two control schemes: one which determines the overall aeration effort required, and one or more controllers which adjust the balance between zones to equalize the process error from setpoint from zone to zone.