A device and method for shortcut nitrogen removal and nitrite-oxidizing bacteria activity inhibition are disclosed herein. An embodiment of the present invention provides a yarn fiber diffuser comprising: a plurality of yarn fibers on which bacteria can be attached and grow; and an inlet capable of supplying gas to one sides of the plurality of yarn fibers, wherein the gas includes oxygen and carbon dioxide, nitrite can be produced by the oxygen, and the concentration of oxygen in the gas is adjusted by the oxygen and the carbon dioxide.

A wastewater treatment system and a wastewater treatment process, fluidly combining a one or more SBR (sequencing batch reactor) module/s, in which nitrification and denitrification of the wastewater are performed in sequences and one or more MBR (membrane bioreactor) module/s.

The present invention relates to a wastewater treatment apparatus for shortcut nitrogen removal using anaerobic ammonium oxidation (ANAMMOX) and partial nitritation using ammonium oxidizing bacteria (AOB) granules. High-purity AOB granules are formed by means of AOB predominance using a side stream generated during a sludge treatment process. Moreover, the formed AOB granules are supplied to a partial nitritation tank (130) of a main treatment process and thus the partial nitritation is efficiently performed and nitrogen is quickly removed, and thus oxygen and an organic material is reduced compared to an existing method.

The present disclosure relates to wastewater treatment systems for attracting and retaining anaerobic ammonia oxidizing (anammox) bacteria, methods of treating wastewater using such wastewater treatment systems, and the like.

A process for aerobic treatment of wastewater is provided, which process comprises: (a) supplying a liquid influent comprising wastewater to a reactor containing granular biomass; (b) subjecting the reaction mixture to aerobic conditions comprising a concentration of dissolved oxygen from 0.1 mg/L to 4.0 mg/L, and a hydraulic retention time from 0.5 to 72 hours; (c) separating the reaction mixture into granular biomass and treated wastewater; and (d) recycling separated granular biomass to the reaction mixture. A bioreactor for the process is also disclosed, comprising a reaction vessel provided with an aeration means, a solids separation device with an inlet in the lower part of the reaction vessel having an outlet line for solids arranged to transport separated solids to a riser driven by airlift action and arranged to transport the solids to the upper part of the reaction chamber.

A deammonification system 100 and process for treating wastewater are disclosed herein. The system and process may involve an anaerobic reactor 204 operable to produce biogas 2 from organic carbon in the wastewater 1, and a deammonification unit including (i) one or more anoxic chambers 302 in fluid communication with the anaerobic reactor 204, wherein each of the one or more anoxic chambers 302 houses a plurality of biocarriers 306, wherein each of the plurality of biocarriers 306 includes a biofilm of anaerobic ammonium oxidation bacteria, and (ii) one or more oxic chambers 304 operable to produce nitrite from ammonia and/or ammonium, wherein the wastewater processed in an anoxic chamber 302 of the one or more anoxic chambers 302 is channeled to an oxic chamber 304 of the one or more oxic chambers 304 which is adjacent to and downstream of the anoxic chamber 302.

An advanced nitrogen removal method using partial nitrification-denitrification coupled two-stage autotrophic denitrification. Sewage is introduced into a first pool for partial nitrification-denitrification treatment, and then introduced into a first regulating reservoir. Dissolved oxygen content in the first pool is kept at 0.4-0.6 mg/L. Water is discharged when a molar ratio of nitrite nitrogen to ammonia nitrogen in the first regulating reservoir is 1.0-1.3:1. Effluent in the regulating reservoir is introduced into a second pool for anaerobic ammonia oxidation treatment, and then introduced into a second regulating reservoir. In the second pool, pH is 7.0-7.4, a temperature is 22-28 C. Effluent in the second regulating reservoir and sulfides are introduced into a third pool for denitrification treatment. Water is discharged. In the third pool, pH is 7.5-8.0, a temperature is 28-32 C., a mass ratio of sulfur to nitrogen is 1.9-2.0:1.

Mainstream partial nitritation was studied at 10 C. in a moving bed biofilm reactor treating synthetic wastewater containing both nitrogen (40 mg L-1) and organic carbon at COD/N ratio ranging from 1.3 to 2.2. Three different control strategies were investigated to achieve partial nitritation. Initially, biofilm age was controlled by incorporating a media replacement strategy. Next, separately from the media replacement, oxygen limited conditions were investigated and finally pH control was incorporated together with oxygen limitation. Successful partial nitritation was achieved only by combining oxygen limitation with pH control. The average NH4-N concentration was equal to 16.01.6 mg L-1 and average NO2-N concentration was equal to 15.72.4 mg L-1 during steady state partial nitritation. The average residual NO3-N concentration was equal to 2.62.2 mg L-1. The results obtained from this study prove for the first time that partial nitritation can be successfully controlled in a biofilm reactor treating wastewater with low nitrogen concentration, relatively high COD/N ratio and at low temperature. An algorithm for dynamic process control of partial nitritation has been also developed.

A carbon removal and denitrification treatment device for a leachate from a waste incineration plant includes a pretreatment unit, an anaerobic reactor, a nitrification cycle unit, an anaerobic ammonium oxidation cycle unit and an NF membrane filter that are sequentially communicated. A denitrification cycle assembly is disposed between the nitrification cycle unit and the anaerobic ammonium oxidation cycle unit. When the leachate is treated, the leachate is pretreated by the pretreatment unit to successively enter the anaerobic reactor, the nitrification cycle unit and the anaerobic ammonium oxidation cycle unit for carbon removal and denitrification.

A wastewater treatment system may use recycle water to apply an anaerobic ammonium oxidation (ANAMMOX) process to a water treatment process (mainstream treatment process) and to stably supply nitrite required for an ANAMMOX. By applying the ANAMMOX process, nitrogen and phosphorus may be simultaneously treated in the water treatment process, and recycle water may be used as a source of nitrite for ANAMMOX, thereby reducing wastewater treatment costs and pollutant loading.