A method of processing waste water to produce a filtrate is provided. The method includes the steps of: introducing untreated wastewater to an inlet zone of a bioreactor; introducing a concentrate of treated waste water with at least 10,000 mg/L of total suspended solids into the inlet zone of the bioreactor to form a biological active mixture; aerating the biological active mixture in an aeration zone of the bioreactor to produce treated waste water; filtering the treated waste water to produce a filtrate and the concentrate, wherein the filtrate created by the filtering has total suspended solids of less than 10 mg/L; transferring at least a portion of the concentrate to the inlet zone of the bioreactor; and transferring the filtrate external to the bioreactor as clean water.

A method for the anaerobic cultivation of microorganisms includes providing an aqueous solution having a pH value of 4.5 to 7.5 in a container, adding a substrate in a first substrate dosage to the aqueous solution, adding further elements to the aqueous solution, adding an inoculant with microorganisms to the aqueous solution, hermetically sealing the container, varying a temperature in a range from 40 to 80 degrees Celsius, taking a reference liquid sample and determining a first concentration of organic substance in the reference liquid sample, taking another liquid sample and determining another concentration of organic substance in the further liquid sample after the expiration of the first waiting time, if the further concentration of organic substance is smaller than 10 percent of the first concentration of organic substance, adding substrate in another substrate dosage, repeating until a sufficient amount of biomass is present in the container.

An apparatus and method for selecting and retaining solids in an activated sludge process for the improving wastewater treatment using screens. The screens can be used to separate and retain solids based on size or compressibility. The screens are used to separate and select for slow growing organisms, faster settling organisms, or materials added to absorb, treat or remove constituents in the activated sludge process.

A process for producing PHA comprises obtaining biomass produced in the course of biologically treating a first wastewater source containing RBCOD. The biomass is to be exploited with a second wastewater source having a different RBCOD content from the first wastewater source in order to accumulate and thereby produce PHA. Before subjecting the biomass to a PHA accumulation process, the biomass PHA accumulation potential is enhanced via an acclimation process with the second wastewater source. During acclimation, the biomass is subjected to repeated feast-famine periods. During each feast period, the biomass is exposed to a fraction of the second wastewater source. The RBCOD uptake and/or biomass respiration rate is directly or indirectly measured during each feast period. The famine period is maintained for a period of time that is at least two times greater than the length of time of the proceeding feast period. After at least two feast-famine acclimation periods or after one or more measured parameters reveal an increased RBCOD relative uptake or respiration rate of the biomass during a subsequent feast period, the biomass is subjected to a PHA accumulation process using the second wastewater source.

The present disclosure discloses a method and device for removing Organic Micropollutants (OMPs) in water, and belongs to the technical field of wastewater treatment. The method includes the following steps: S1: aerating residual sludge under a starvation condition to enrich starved-state microorganisms; and S2: treating wastewater containing OMPs under an aeration condition with sludge containing the starved-state microorganisms obtained in step S1, and periodically updating the sludge containing the starved-state microorganisms. According to the present disclosure, aerobic starvation treatment is performed on the sludge to gradually reduce the abundance of microorganisms that may use degradable organic matters only and enrich microorganisms that may use complex organic matters in the sludge, and the enriched sludge may degrade various OMPs and be used to remove OMPs in wastewater. The process is easy to operate and low in cost and has relatively high practical application value.

The methods and systems provide for the improvement in the separation of different portions of solids particles, such as bacteria, from a process stream. The methods use gas and control of fluid flow within a tank zone to provide for separation that is more selective.

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.

This invention relates to apparatus, methods and applications for treating wastewater, and more particularly to a technique of biological processes that integrates lowering the levels of effluent pollutants and reducing accumulated sludge volume from wastewater. This invention further relates to apparatus and methods for using a blend of non-pathogenic microbes, spores, unicellular organisms, and enzymes on-site at a wastewater treatment facility to rapidly, ecologically, and cost-effectively solve numerous contaminant issues common in wastewater.

A process for controlling the aeration rate during the aerobic phase of a wastewater treatment process is disclosed, which comprises: (a) measuring at moment t.sub.1 the ammonium concentration [NH.sub.4.sup.+].sub.1 and nitrogen oxide concentration [NO.sub.x].sub.1 in a mixture of wastewater and microbial sludge; (b) determining a nitrogen oxide target concentration [NO.sub.x].sup.F.sub.1 at the end of the aerobic phase based on at least the current ammonium concentration [NH.sub.4.sup.+].sub.1 and the current NO.sub.x concentration [NO.sub.x].sub.1; (c) determining a setpoint [NO.sub.x].sup.SP.sub.1 based on interpolation between [NO.sub.x].sub.1 and [NO.sub.x].sup.F.sub.1; (d) adjusting the aeration rate to minimise error between [NO.sub.x].sub.1 and [NO.sub.x].sup.SP.sub.1; and (e) repeating steps (a) to (d) at further moments t.sub.1. The invention further concerns a process for the treatment of wastewater, using the process.

A sewage uniform distribution treatment device for an aerobic granular sludge system and a use method therefor, comprising a reactor tank body (1), a water inlet device (2), and a water outlet device (3). The water inlet device (2) comprises a water inlet inner channel (4), a water inlet weir (5), a water inlet outer channel (6), a vertical water inlet branch pipe (7), and vertical bell mouths (8); the water inlet weir (5) is located at the top of the water inlet inner channel (4) and is connected to the water inlet inner channel (4); the vertical water inlet branch pipe (7) is vertically provided in the reactor tank body (1), and the upper and lower ends of the vertical water inlet branch pipe (7) are respectively connected to the water inlet outer channel (6) and the vertical bell mouths (8); the water outlet device (3) comprises a water outlet main pipe (9), a water outlet channel (10), a water outlet weir (11), an outer baffle plate (12), and an inner baffle plate (13); the water outlet channel (10) is connected to the water outlet main pipe (9); the outer baffle plate (12) is a vertical baffle plate; the inner baffle plate (13) is located at the bottom of the water outlet channel (10) and is connected to the water outlet channel (10); the inner baffle plate (13) and the water outlet channel (10) are provided at a certain included angle. The device has the advantages of being reasonable in structural design, convenient to operate and use, low in running energy consumption, low in later maintenance costs, and high in automation and intelligence degree, and can realize an ideal contact effect between organic matters and sludge.