## 1 Introduction  
A series of biochemical and physical changes occurred in the urban environment due to rapid urbanization, including a considerable increase in the stormwater runoff volume and water receiving bodies degradation [1]. The porous asphalt pavement (PAP) system can potentially minimize the influence of stormwater runoff in the ecology, hydrology, and quality of water receiving bodies simultaneously, which has been implemented worldwide [2]. As reported, the PAP system exhibits high removal capacity for various heavy metals [3], suspended solids [4], and oils [5], while the removal efficiency of nutrients such as phosphorus (P) [6] and nitrogen (N) [7] are unsatisfactory. The quality of water is closely associated with N and P, and excessive N and P would lead to eutrophication [8]. As quantities of N and P in urban environments result from stormwater runoff, effective measurements are needed to control before draining [9]. N removal by porous asphalt pavement varied significantly, which is overall ineffective in an extended period, mainly due to the limited capacity of adsorption and short contact time of bituminous mixtures and gravel [10]. Nonetheless, studies also showed that the PAP system may remove pollutants by biological degradation [11], adsorption [12], and export of nitrate under suitable conditions through nitrification in the sub-base. As a result, researchers are devoted to increasing the ammonia nitrogen (NH4+-N) adsorption [6] by various new materials under a saturated zone to improve the elimination of NH4+-N [13], but the saturated zone affects the removing performance of the N by high variability, which influences the strength and stability of the PAP system [7]. Consequently, the improvement in the removal of total nitrogen (TN) is negligible due to nitrate denitrification in the presence of a saturated zone [14]. The total phosphorus (TP) contained dissolved phosphorus (DP) and particulate phosphorus (PP) which were transported by stormwater runoff. The PAP system has a high efficiency of removing PP, however, it is less effective in removing DP because its removal mainly depends on P chemisorptions [6]. [PERSON] et al. reported that the P removal in the PAP system mainly relied on the absorption of voids into the asphalt mixture and the precipitation on the surface of gravel and the adsorption ability of the materials in the PAP system for P were affected significantly by the content of calcium carbonate. Moreover, materials with abundant compounds of calcium and lanthanum probably influence the removal of P from wastewater [15]. Lanthanum-modified adsorbents particularly demonstrate several promising advantages during phosphate removal such as their superior adsorption capacity, wide operating pH range, and high removal rate (96%) at low phosphate concentrations. Thus, the P removal may be enhanced by integrating such compounds into the media applied in the PAP system. Zeolite has been broadly explored for the removal of ammonium due to its high capacity of cationic exchange, which has been affirmed as a promising material for its removal from contaminated waters. In addition, the adsorption capacity of the modified zeolite for nitrogen and phosphorus was significantly improved [16]. It was easy to form powder under the impact of heavy rainfall because of the fine zeolite particles. These defects limited the application of zeolite in stormwater runoff treatment. In view of such problems, the development of an adsorbent with high adsorption capacity utilized in the PAP system to remove N and P simultaneously with shallower depths and smaller space would be a way worth considering. NaOH-activated with LaCl3-impregnated synthetic modified zeolite porous microspheres (MZP-PM) were designed in this research. Negatively charged zeolite could act as good adsorbents to remove cationic pollutants from water [17].