Phosphate (PO₄³⁻) and nitrate (NO₃⁻) contamination causes the threatening issue of eutrophication. A major waste from seafood industries of various seashells including Anadara inaequivalvis, Saccostrea commercialis, Perna viridis, Tegillarca granosa, Filopaludina martensi, Babylonai areolate and Meretrix lusoria was thermally modified and investigated for PO₄³⁻ and NO₃⁻ removal from synthetic and domestic wastewater. It was found that some raw seashells could remove ≥85% of PO₄³⁻, whereas their NO₃⁻ removal efficiency was poor. However, after calcination, among others, only M. lusoria pyrolysed at 800 °C (M. lusoria F800) was found as a novel adsorbent for both PO₄³⁻ and NO₃⁻ removal. An increase in temperature and increased Ca(OH)₂ content enhance the removal of PO₄³⁻ and NO₃⁻ by precipitating with calcium ions (Ca²⁺). M. lusoria F800 was the best for PO₄³⁻ and NO₃⁻ removal compared with commercial lime and other calcined seashells. The maximum adsorption capacity (Q_max) of M. lusoria F800 for PO₄³⁻ and NO₃⁻ was 700 mg/g and 170 mg/g, respectively, which was higher than the Q_max of PO₄³⁻ and NO₃⁻ by commercial lime Ca(OH)₂ which was about 465 mg/g and 18 mg/g, respectively. The crystals of calcium phosphate-hydroxide and calcium nitrate-hydroxide complexes were mainly found in M. lusoria F800 that adsorbed PO₄³⁻ and NO₃, respectively, as confirmed by X-ray diffractometer (XRD). Also, M. lusoria F800 could completely remove PO₄³⁻ and NO₃⁻ from domestic wastewater. Hence, easily handled and cost-effective M. lusoria F800 would increase the value of this waste material, increase water quality and mitigate eutrophication.

磷酸盐（PO ₄ ^3-）和硝酸盐（NO ₃ ^- ）的污染会导致威胁的富营养化问题。对来自各种贝壳类海产品行业的主要废物进行了热改性，并研究了其对来自合成和生活废水中的PO ₄ ³⁻和NO ₃ ^−的去除进行了热处理，这些废弃物包括Anadara inaequivalvis，Saccostrea commercialis，Perna viridis，Tegillarca granosa，Filopaludina martensi，Babylonai areolate和Meretrix lusoria。。发现一些未加工的贝壳可以去除≥85％的PO ₄^3-，而他们的NO ₃ ^-除去效率差。但是，煅烧后，除其他外，只有M. lusoria热解在800℃下（M. lusoria F800）被发现作为一种新型吸附剂二者PO ₄ ^3-和NO ₃ ^-的去除。温度的增加和增加的的Ca（OH）₂含量提高去除PO的₄ ^3-和NO ₃ ^-通过与钙离子（钙沉淀²⁺）。M. lusoria F800最适合PO ₄ ³⁻和NO ₃ ⁻与商业石灰和其他煅烧贝壳相比，去除率更高。最大吸附容量（Q_最大）的M. lusoria F800为PO ₄ ^3-和NO ₃ ^-为700毫克/克和170毫克/克，分别，比Q值越高_最大的PO ₄ ^3-和NO ₃ ^-通过商品石灰Ca（OH）₂分别为约465mg / g和18mg / g。磷酸钙-氢氧化物和硝酸钙-氢氧化物复合物的晶体主要存在于吸附PO ₄ ^3-和NO _3的M. lusoria F800中。分别由X射线衍射仪（XRD）确认。此外，M. lusoria F800可以完全去除PO ₄ ^3-和NO ₃ ^-从生活污水。因此，易于操作且具有成本效益的M. lusoria F800将增加这种废料的价值，提高水质并减轻富营养化。