To prevent eutrophication and remove phosphorus, circulating fluidized bed combustion (CFBC) ash was utilized to elute Ca^2＋ and OH${}^{-}$ for hydroxyapatite (HAP) crystallization. CFBC ash was compared with the gypsum byproduct of a domestic waste incineration plant and pure CaO reagent. CFBC ash proved to be a suitable raw material to supply Ca^2＋ and OH${}^{-}$ for HAP crystallization. CFBC ash was reprocessed as a granular crystallization agent (GCA) to improve its applicability to non-point pollution source control. In addition, a manufacturing procedure for a GCA utilizing 4.8% blast furnace slag as a binder was developed based on durability and the ion elution rate in water. Column tests with sedimentation showed that 93% and 98% of T-P and PO₄-P were removed after 12 h of settling, respectively. In on-site filtration trench tests, filtration following crystallization with a 4 h retention time achieved a 63.5% and 52.8% removal efficiency with respect to T-P and PO₄-P, respectively. After operation for 13 d, an increase in porosity with pore distribution on the surface of the GCA was observed. Through their long-term on-site operation, crystallization-filtration trenches using GCA provide an effective alternative process for the management of agricultural non-point source pollution.

为防止富营养化并去除磷，利用循环流化床燃烧（CFBC）灰分洗脱Ca ²⁺和OH${}^{-}$用于羟基磷灰石（HAP）结晶。将CFBC灰与生活垃圾焚烧厂的石膏副产品和纯CaO试剂进行了比较。CFBC灰被证明是供应Ca ²⁺和OH的合适原料${}^{-}$用于HAP结晶。CFBC灰作为颗粒结晶剂（GCA）被重新处理，以提高其在面源污染控制中的适用性。另外，基于耐久性和水中的离子洗脱率，开发了利用4.8％高炉矿渣作为粘合剂的GCA的制造方法。沉降沉淀柱试验表明，沉降12 h后分别除去了TP和PO ₄ -P的93％和98％。在现场过滤沟槽测试中，结晶后的过滤（保留时间为4小时）相对于TP和PO ₄达到63.5％和52.8％的去除效率-P分别。运转13 d后，观察到GCA表面孔隙度随孔隙分布而增加。通过长期的现场操作，使用GCA的结晶过滤沟渠为管理农业面源污染提供了有效的替代方法。