Method for removing phosphorus
AssigneeJiangxi JDL Environmental Protection Research Ltd.
InventorsZhimin Liao, Zhihua Yuan, Jialin Zhou, Lingyun He, Shuyan Chen, Aiguo Wan, Wenqian Chen
Life of this patent
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Abstract
A method for removing phosphorus includes at least the steps of: 1) placing lanthanum oxide hydrate (absorbent) into a device for removing phosphorus, and allowing sewage having a phosphorus content of less than 100 mg/L to flow through the device; 2) adding sodium hydroxide (regeneration solution of the absorbent) when the absorption capacity of the device is exhausted, and allowing the regeneration reaction to proceed for between 4 and 12 hours; and 3) collecting eluate from step 2) and recycling phosphorus.
Claims20
A method for removing phosphorus, the method comprising the steps of:
- 1) disposing lanthanum oxide hydrate in a device to act as an absorbent, directing sewage to flow into said device;
- allowing phosphorus in said sewage to adhere to the surface of said absorbent, and directing an effluent from said device to flow out into a water tank;
- 2) adding a solution of sodium hydroxide to said device, whereby said absorbent is recycled and an eluate containing phosphorus is produced;
- and
- 3) directing said eluate into a solution tank, and evaporating said eluate to form a fertilizer comprising phosphorus.
A method for removing phosphorus, the method comprising:
- 1) disposing lanthanum oxide hydrate having a particle size of between 2 and 20 mm in a device to act as an absorbent, directing sewage to flow into said device and allowing phosphorus in said sewage to adhere to the surface of said absorbent;
- 2) when phosphorus content of an effluent from said device is less than 0.5 mg/L, directing the effluent from said device to flow out into a water tank;
- when phosphorus content of the effluent from said device is more than 0.5 mg/L, adding an solution of sodium hydroxide to said device, whereby said absorbent is recycled and an eluate containing phosphorus is produced;
- and
- 3) directing said eluate into a solution tank, and evaporating said eluate to form a fertilizer comprising phosphorus.
A method for removing phosphorus, the method comprising:
- 1) providing a device for removing phosphorus, wherein the device is an absorption column or an absorption tank;
- disposing quartz sand at the bottom of said absorption column or said absorption tank, placing a layer of lanthanum oxide hydrate having a particle size of between 2 and 20 mm on said quartz sand to act as an absorbent;
- directing sewage to flow into said device, and allowing phosphorus in said sewage to adhere to the surface of said absorbent;
- 2) when phosphorus content of an effluent from said device is less than 0.5 mg/L, directing the effluent from said device to flow out into a water tank;
- when phosphorus content of the effluent from said device is more than 0.5 mg/L, adding an solution of sodium hydroxide to said device, whereby said absorbent is recycled and an eluate containing phosphorus is produced;
- and
- 3) directing said eluate into a solution tank, and evaporating said eluate to form a fertilizer comprising phosphorus.
Dependencies are inferred from the claim text.