摘要:
A process for the biological treatment of wastewater in which the performance of a conventional activated sludge system is improved by adding an aerobic granular biomass system in a hybrid parallel process configuration. Waste biomass and suspended material from the aerobic granular biomass system is introduced into the conventional activated sludge system for this purpose. In the hybrid process configuration the advantages of both systems are combined to produce new advantages, while drawbacks of the individual systems are reduced to great extent.
摘要:
A wastewater treatment system having a first solid-liquid separation unit, a membrane aerated biofilm (MABR) reactor, a second solid-liquid separation unit and an anaerobic digester. Waste sludges from the solid-liquid separation units are treated in the anaerobic digester. The solid-liquid separation unit preferable comprises a micro-sieve. The treatment system may also comprise an aerated contact tank with a hydraulic retention time of 6 hours or less. Optionally, the MABR may comprise a membrane filtration unit.
摘要:
There is provided a method which eliminates a decrease in activity of an activated sludge treatment microorganism group, which greatly increases treatment ability of the microorganism group, to enhance treatment efficiency and to reduce the amount of excess sludge. The wastewater treatment method of the present invention includes, when raw water (1a) is subjected to an activated sludge treatment, performing a first sludge returning step (Va) (a step of returning sludge, which was previously aerated and stirred in a first excess sludge tank or sludge retention tank (12a) equipped with an aerator and a stirrer, to an treatment tank, a sequencing batch reactor or an anaerobic tank; and/or a step of returning sludge, which was previously aerated and stirred in a second excess sludge tank or thickened sludge retention tank (13a) equipped with an aerator and a stirrer, to a treatment tank, a sequencing batch reactor or an anaerobic tank), and maintaining the number of genus Bacillus bacteria in the treatment tank, the sequencing batch reactor or the anaerobic tank, to which the sludge has been returned, at 2.0×10 5 to 22.5×10 5 cfu/mL.
摘要:
The present invention provides a method for treating wastewater containing ammonia nitrogen, in which an entire nitrification reaction to convert ammonia nitrogen to nitrate nitrogen via nitrite nitrogen is promoted by allowing nitrifying bacteria to perform the nitrification reaction in the presence of an intermicrobial signaling molecule.
摘要:
A wastewater treatment plant (700, 800, 1000, 1100) that employs an activated sludge process and a method of operating the same is described. Wastewater influent is provided to a bioreactor (602, 1006) configured to perform activated sludge processing to develop mixed liquor suspended solids (MLSS). The MLSS is passed from the bioreactor (602, 1006) to a hydrodynamic separator (HDS) system (702, 802, 1010), where separation operations are performed on the MLSS. The separation operations generate a low concentration MLSS stream and a high concentration MLSS stream. The low concentration MLSS stream is passed from the hydrodynamic separator system (702, 802, 1010) via a first output to a clarifier (604, 1012), and the high concentration wastewater stream is passed via a second output back to the bioreactor (602, 1006). The clarifier (604, 1012) performs clarification operations on the cleaned wastewater stream and then outputs an effluent flow.
摘要:
An anaerobic digester is fed a feedstock, for example sludge from a municipal wastewater treatment plant, and produces a digestate. The digestate is dewatered into a cake. The cake may be dried further, for example in a thermal drier. The cake is treated in a pyrolysis system to produce a synthesis gas and biochar. The gas is sent to the same or another digester to increase its methane production. The char may be used as a soil enhancer.