| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a treatment method of organic sewage for removing phosphorus and ammonia from the organic sewage, enabling to recover them as valuable resources, greatly reduce generation quantities of coagulated sludge and excessive sludge, and also reduce a use quantity of an inorganic coagulant. SOLUTION: This treatment method of the organic sewage consists of a biological treatment process A for adsorbing and removing the phosphorus and ammonia by allowing iron hydroxide and zeolite to coexist when the organic sewage containing the phosphorus and ammonia is treated biologically, a process B by which a portion of activated sludge in the biological treatment process A is taken out and added with an alkali chemical, and the phosphorus and ammonia are eluted from the activated sludge, and the activated sludge is made dissolvable, and later, the solid is separated from the solution, and a process C by which the separated liquid from the solid-liquid separation is added with a magnesium chemical to recover the phosphorus and ammonia as magnesium ammonium phosphate.</p> |
