Composite phosphate removing agent for removing high-concentration phosphorus-containing waste water and application method thereof

Abstract

The invention discloses a composite phosphate removing agent for removing high-concentration phosphorus-containing waste water and an application method thereof, and belongs to the field of sewage disposal in environmental protection. The composite phosphate removing agent is formed by mixing organic substances and inorganic substances, wherein the organic substances refer to organic acid and organic alcohol, and the inorganic substances refer to talcum powder, sodium ferrate and the like. The composite phosphate removing agent comprises the following compositions: 5 to 20 percent of organic acid, 5 to 20 percent of alcohol, 20 to 85 percent of talcum powder and 20 to 85 percent of sodium ferrate. The method comprises the following steps: adding the composite phosphate removing agent with the proportion into the high-concentration phosphorus-containing waste water, wherein the adding amount is between 100 and 1,000 ppm; using waste water containing ammonia nitrogen to adjust the pH value of the phosphorus-containing waste water to 8.0 and 9.0; stirring the mixture for 5 to 30 minutes; and performing air floatation treatment. The yielding water can reach the first-class emission standard of the country. The invention has the characteristics of simple technological flow, relatively low pharmaceutical dosage, low operation cost, low sludge yield, high phosphate removing effect, and the like.

Description

technical field [0001] The invention relates to a phosphorus removal agent for treating high-concentration phosphorus-containing wastewater, relates to the removal of phosphate ions in phosphorus-containing wastewater, and belongs to the field of wastewater treatment in environmental protection. Background technique [0002] Phosphorus and nitrogen are the main elements that cause eutrophication of water bodies, and phosphorus is the most critical. Exceeding a certain amount of phosphorus in water bodies will cause excessive growth of algae, resulting in severe hypoxia in water bodies, death of aquatic organisms, and deterioration of water quality. In the past ten years, the proportion of eutrophic water bodies in my country has increased from 5.0% to about 55%, while the proportion of oligotrophic water bodies has decreased from 3.2% to 0.53%. It has become an urgent problem to study the phosphorus removal technology of wastewater and control the discharge of phosphorus. ...

AI Technical Summary

Problems solved by technology

This method is simple in process, reliable in operation, and can meet higher effluent total phosphorus requirements, but the process is a precipitation-dissolution equilibrium reaction. On the one hand, the alkalinity in the wastewater causes some metal hydroxides to precipitate, consuming a part of the amount of medicine; On the other hand, in order to achieve a lower concentration of phosphorus ions, it is necessary to maintain a higher concentration of metal ions in the wastewater. Due to the quasi-equilibrium phenomenon (pseudo2equilibrium) of tiny precipitated particles, the apparent solubility product is much higher than the real solubility product. In order to achieve For the formation conditions of phosphate precipitation, the concentration of the metal ion precipitant that needs to be added is often 1 to 2 orders of magnitude higher than the normal solubility product, so the cost of the agent is higher; the resulting concentration of residual metal ions (such as iron ions) is also higher , Exceeding the standard metal ion concentration may also cause chronic toxicity to organisms; the chemical sludge produced by chemical precipitation has a large water content, is difficult to dehydrate, is difficult to handle, and is prone to secondary pollution