Method of treating waste water for removing nitrogen and phosphorus and apparatus therefor
OwnerSang Bae Haninventor
Life of this patent
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Abstract
A method of treating sewage or waste water for removing nitrogen and phosphorus as well as organic materials in the sewage or waste water, and an apparatus therefor are provided. The method applies intermittent aeration and dynamic flow to an equipment having at least a pair of reaction basins with intermittent aeration means, a clarifier with sludge transfer means, and a filter for passing liquid without passing solid between the reaction basins. According to the method, the efficiency of removing nutrient salts is excellent and stable even in the treatment of waste water having low content of influent organisms and low C/N ratio.
Claims13
A method of treating a waste water for removing nitrogen and phosphorus comprising the following steps carried out repeatedly in a system comprising at least a pair of reaction basins with an intermittent aeration means, a clarifier for precipitating reacted waste water from the reaction basins, and a filtering means equipped between the reaction basins:
- introducing a raw waste water into a first reaction basin where denitrification and release of phosphorus are carried out in an anaerobic condition, discharging the waste water through the filtering means into a second reaction basin where nitrification and decomposition of organisms are carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge into the second reaction basin (phase A);
- introducing a raw waste water into the second reaction basin where an aerobic reaction is carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge into the second reaction basin, while in the first reaction basin, removing phosphorus through luxury uptake of the phosphorus into the sludge in an aerobic condition without inflow and outflow (phase A-1)
- introducing a raw waste water into the second reaction basin where denitrification and release of phosphorus are carried out in an anaerobic condition, discharging the waste water through the filtering means into the first reaction basin where nitrification and decomposition of organisms are carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge into the first reaction basin (phase B);
- and
- introducing a raw waste water into the first reaction basin where an aerobic reaction is carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge into the first reaction basin, while in the second reaction basin, removing phosphorus through luxury uptake of the phosphorus into the sludge in an aerobic condition without inflow and outflow (phase B-1).
A method of treating a waste water for removing nitrogen and phosphorus comprising the following steps carried out repeatedly in a system comprising at least a pair of reaction basins with an intermittent aeration means, a clarifier for precipitating reacted waste water from the reaction basins, a filtering means equipped between the reaction basins, and a preliminary denitrification basin installed in a previous stage of the reaction basins:
- introducing a raw waste water through the preliminary denitrification basin into a first reaction basin where denitrification and release of phosphorus are carried out in an anaerobic condition, discharging the waste water through the filtering means into a second reaction basin where nitrification and decomposition of organisms are carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge through the preliminary denitrification basin into the first reaction basin (phase A);
- introducing a raw waste water through the preliminary denitrification basin into the second reaction basin where an aerobic reaction is carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge through the preliminary denitrification basin into the second reaction basin, while in the first reaction basin, removing phosphorus through luxury uptake of the phosphorus into the sludge in an aerobic condition without inflow and outflow (phase A-1)
- introducing a raw waste water through the preliminary denitrification basin into the second reaction basin where denitrification and release of phosphorus are carried out in an anaerobic condition, discharging the waste water through the filtering means into the first reaction basin where nitrification and decomposition of organisms are carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge through the preliminary denitrification basin into the second reaction basin (phase B);
- and
- introducing a raw waste water through the preliminary denitrification basin into the first reaction basin where an aerobic reaction is carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge through the preliminary denitrification basin into the first reaction basin, while in the second reaction basin, removing phosphorus through luxury uptake of the phosphorus into the sludge in an aerobic condition without inflow and outflow (phase B-1).
A method of treating a waste water for removing nitrogen and phosphorus comprising the following steps carried out repeatedly in a system comprising at least a pair of reaction basins with an intermittent aeration means, a clarifier for precipitating reacted waste water from the reaction basins, a filtering means equipped between the reaction basins, and an additional reaction basin installed in a previous stage of the clarifier:
- introducing a raw waste water into a first reaction basin where denitrification and release of phosphorus are carried out in an anaerobic condition, discharging the waste water through the filtering means into a second reaction basin and a third reaction basin where nitrification and decomposition of organisms are carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge into the second reaction basin (phase A);
- and
- introducing a raw waste water into the second reaction basin where denitrification and release of phosphorus are carried out in an anaerobic condition, discharging the waste water through the filtering means into the first reaction basin and a third reaction basin where nitrification and decomposition of organisms are carried out in an aerobic condition, and discharging the treated waste water through the clarifier and returning a sludge into the first reaction basin (phase B).
An apparatus for treating a waste water for removing nitrogen and phosphorus comprising:
- at least a pair of reaction basins equipped with an intermittent aeration means;
- a filtering means for passing the waste water between the reaction basins;
- a clarifier for precipitating the waste water from the reaction basins;
- a first flow path for introducing a raw waste water;
- a second flow path for introducing the waste water from the first flow path into each reaction basin separately;
- a third flow path for discharging the waste water from each reaction basin separately;
- a fourth flow path for introducing the waste water from the third flow path into the clarifier;
- a fifth flow path for discharging the waste water from the clarifier;
- a sixth flow path for introducing a sludge into each reaction basin separately;
- and
- flow path control means equipped on the flow paths.
Dependencies are inferred from the claim text.