Research advances of the phosphorus-accumulating organisms of Candidatus Accumulibacter, Dechloromonas and Tetrasphaera: Metabolic mechanisms, applications and influencing factors.

Recent advances in nitrous oxide production and mitigation in wastewater treatment

Simultaneous nitrogen and phosphorus removal by interactions between phosphate accumulating organisms (PAOs) and denitrifying phosphate accumulating organisms (DPAOs) in a sequencing batch reactor

Biopolymer-based flocculants have become a potential substitute for inorganic coagulants and synthetic organic flocculants due to their wide natural reserves, environmental friendliness, easy natural degradation, and high material safety. In recent years, with more and more attention to clean technologies, a lot of researches on the modification and application of biopolymer-based flocculants have been carried out. The present paper reviews the latest important information about the base materials of biopolymer-based flocculants, including chitosan, starch, cellulose, and lignin etc. This review also highlights the various modification methods of these base materials according to reaction types in detail. Via the recent researches, the flocculation mechanisms of biopolymer-based flocculants, such as adsorption, bridging, charge neutralization, net trapping, and sweeping, as well as, some other special mechanisms are comprehensively summarized. This paper also focuses on the water treatment conditions, the removal efficiency, and advantages of biopolymer-based flocculants in applications. Further, this review sheds light on the future perspectives of biopolymer-based flocculants, which may make progress in the sources of base materials, modification processes, multi-function, and deepening application researches. We believe that this review can guide the further researches and developments of biopolymer-based flocculants in the future, to develop them with a higher efficiency, a lower cost, more safety, and multi-function for more diversified applications.

/pdf/biopolymer-based-flocculants-a-review-of-recent-technologies-3qtgag8l5f.pdf

Biopolymer-based flocculants: a review of recent technologies

Enhanced simultaneous nitrogen and phosphorus removal from low COD/TIN domestic wastewater through nitritation-denitritation coupling improved anammox process with an optimal Anaerobic/Oxic/Anoxic strategy.

Single-stage denitrifying phosphorus removal biofilter utilizing intracellular carbon source for advanced nutrient removal and phosphorus recovery

The invention relates to a high-standard nitrogen and phosphorus removal method for municipal wastewater. A sequencing batch activated sludge reactor is adopted, operation conditions comprise water inflow, anaerobic treatment, aerobic treatment, anoxic treatment, post-aerobic treatment, precipitation and water drainage, wherein an anaerobic stage is arranged at the front end of an aeration stage, and a carbon source in water is transformed into an internal carbon source in sludge through adsorption and absorption of microorganisms; meanwhile, through prolonging of the sludge age, being 20-150 d, of the reactor, nitrifying bacteria in the reactor are enriched, the nitrification efficiency of the reactor is enhanced, the aeration time is shortened, so that the sufficient carbon source is provided for nitrogen and phosphorus removal through denitrification in the anoxic stage after aeration, and further, deep nitrogen and phosphorus removal under long sludge age is realized. According to the method, nitrogen removal through denitrification and phosphorus removal through denitrification are realized through the carbon source in cells under the conditions of short-time aeration and long sludge age, the method has the advantages of high efficiency of deep synchronous nitrogen and phosphorus removal, short process, simple operation and low investment and operation cost, and a new way is provided for deep nitrogen and phosphorus removal of a wastewater plant.

High-standard nitrogen and phosphorus removal method for municipal wastewater

The invention discloses a negative pressure oxygenated pressure pipe type sewage treatment reactor, composed of two parts of negative pressure oxygenation and pressure pipe type reaction zone. Reactor water inflow is pressurized by a water pump firstly, and negative pressure oxygenation is carried out to carry massive oxygen into the pressure pipe type reaction zone. The reaction zone is composed of a plurality of pipe sections which are horizontally arranged, suspension filler is arranged in the interior, and a grating is arranged at the middle for separation. Meanwhile the water inlet pipe at the front end of pipeline is provided with a pressure regulating valve, so as to regulate and control pressure in the pipe, the top is provided with a vent valve, a safety valve and a filler feeding hole, the bottom is provided with a discharge pipe, the terminal is provided with a drain pipe, and the treated sewage is discharged to nearby water body. The treatment reactor integrates sewage conveying and treatment functions into a whole and has the advantages of good sanitary condition, strong impact load resistance, high treatment efficiency, low operating energy consumption, less residual sludge and simple process.

Pressure pipe type sewage treatment reactor

The utility model discloses a pressure tube sewage processing reactor which is oxygenate by negative pressure, which consists of a negative pressure oxygen charging part and a pressure tube reaction area. Water entering the reactor is pressurized by a water pump and is oxygenate by negative pressure, so the water carrying a lot of oxygen enters the pressure tube reaction area. The reaction area consists of a plurality of tube sections which are horizontally arranged, suspension filling is arranged inside the reaction area, and grid plates are arranged in the reaction area. At the same time, a water inlet tube on the front end of the pipeline is provided with a pressure regulation valve which is used for regulating the pressure inside the tube, the top part of the pipeline is provided with an exhaust valve, a safety valve and a filling feeding port, the bottom part of the pipeline is provided with a mud discharging tube, the end of the pipeline is provided with a drain tube, and sewage after being processed is discharged to the nearby water. The processing reactor integrates the sewage conveying function and the sewage processing function, and has the advantages of good sanitary condition, strong impact resistance, strong load capacity, high processing efficiency, low running energy consumption, less remained mud, simple process and the like.

Pressure tube sewage processing reactor

The invention discloses a high-load constructed wetland reactor based on light stuffing. The high-load constructed wetland reactor is used for deeply processing tail water of an urban sewage plant and is provided with a gravel stuffing layer, a light stuffing layer and a modularized wetland plant planting system from bottom to up; the light stuffing is of a net-fiber porous structure, large in specific surface area, high in porosity and good in biological affinity, can obviously improve the amount of microorganisms on a wetland stuffing carrier and can improve the removal efficiency of pollutant in sewage; the modularized wetland plant planting system uses the light stuffing as a supporting carrier for planting wetland plants, the light stuffing is compressed and then arranged in a hollow concrete plant planting module, and the light stuffing is high in porosity and better in ventilation and water permeability and can facilitate growth of plant roots; the system can be assembled and disassembled at will and brings convenience to maintenance, renovation and landscape design of a constructed wetland. The reactor has the advantages of being low in cost, low in requirement for a civil structure, short in starting time, high in processing load, small in occupancy, convenient to operate and maintain and good in landscape effect.

High-load constructed wetland rector based on light stuffing

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