Phosphorus is widely used in chemical production, and the wastewater generated during the process usually contains high concentrations of phosphorus, which has an impact on the environment. China has established strict discharge standards. How to treat high phosphorus wastewater and complete wastewater reuse? Let's learn about the process treatment of high phosphorus wastewater reuse together.

The treatment process steps for the reuse of high phosphorus wastewater:

a. Chemical phosphorus removal: Collect the phosphorus containing wastewater to be treated and transfer it to the sewage tank. Then, lift the pump and transfer it to the fast stirring area a of the chemical change tank. Add lime milk with a calcium phosphorus ratio of 1.0-1.6 to provide calcium ions and phosphate ions in the wastewater for reaction. Add alkaline solution and control the pH at 9-11. Under rapid stirring, fully react for 30-60 minutes, and the reactant is calcium phosphate precipitation.

b. Flocculation precipitation: The turbid liquid containing a large amount of calcium phosphate generated from the above reaction overflows into the fast stirring zone b, and appropriate coagulants are added. Under rapid stirring, mix thoroughly for 15-30 minutes to completely disrupt the stability of the solution, making it easier to coagulate and precipitate afterwards. Then overflow into the slow stirring zone c, add appropriate flocculant, and mix thoroughly for 15-30 minutes under slow stirring to produce large and small alum flowers. Overflow into the sedimentation tank for rapid sedimentation, settling for 30-60 minutes, and the supernatant from the sedimentation tank overflows to subsequent pretreatment. If the stirring rate is too fast in this flocculation process, it will damage the alum flower and affect the sedimentation effect.

c. Pre treatment: The above supernatant is filtered through a multimedia filter to block the suspended solids in the wastewater. It is further filtered through a microporous ultrafiltration membrane system, and then softened with Cpu to absorb calcium ions from the wastewater before being sent to the back-end membrane for treatment.

d. Nanofiltration membrane solution: water is produced after pre-treatment and ultimately undergoes deep treatment through a nanofiltration membrane system. The nanofiltration membrane adopts a two-stage series connection solution, and the first stage nanofiltration membrane adjusts the pH 7-8 by adding acid to the inlet water. Under these conditions, the calcium phosphate precipitate that is prone to scaling and blocking the membrane is converted into soluble calcium hydrogen phosphate, and the divalent calcium ions precipitated are removed by the primary membrane. By adjusting the pH of the produced water to 9-10 with liquid alkali, under these conditions, hydrogen containing cations such as dihydrogen phosphate can remove hydrogen ions and become divalent or higher cations. Entering the secondary membrane, the remaining phosphate ions are removed, and the produced water with a total phosphorus content of less than 0.5mg/l is obtained and sent to the clean water tank for reuse as circulating water. The concentrated water from the primary and secondary membranes converges and flows back to the sewage tank for further resolution.

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