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Never human being has to face such a serious lack of phosphorus and pollutants from human activities. Nutrient recovery from wastewater is a new trend which attracts the interests of several researchers. Extraction of the nutrients, based on struvite crystal from wastewater as nutritious sources, has been assessed as an urgent solution to tackle the water pollution issue. This review focused on feature characteristics of struvite as a chemical fertilizer for plant, struvite formation process in various wastewaters, which is related to physio-chemical conditions, and potential of applying this idea into practice.By creating struvite from wastewater, a useful product can be collected for an agricultural need. Moreover, this also can be assessed as a treatment step in the wastewater treatment process which reduces the contaminants from wastewater. At present, many experiments have been conducted for several kinds of wastewaters to evaluate struvite formation potential in lab scale and pilot scale. In the future, it is essential to further develop full-scale applications to bring struvite formation technology closer to reality. ACKNOWLEDGEMENT

Background and Objectives: Identification of pnemococcal serotypes and antimicrobial resistance provides helpful infor- mation for the use of suitablevaccines and antibiotics; however, very limited data is available on these issues in Vietnam. The present study aimed to find the serotype distribution and drugresistance patterns of Streptococcus pneumoniae isolated from unvaccinated children less than 5 years of age with pneumonia at a province in centre Vietnam. Materials and Methods: A total of 126 clinical pnemococcal strains isolated from unvaccinated children less than 5 years of age with pneumonia at theNghe An province, Vietnam between Nov 2019 and Mar 2021. All strains were identified using conventional microbiological method, VITEK® 2 Compactsystem, specific PCR and sequencing. The serotypes and antimicrobial resistance patterns of pnemococcal strains were determined using the multiplex PCRassays and VITEK® 2 Compact system. Results: The results showed that, eight different pneumococcal serotypes were identified. The  most  common  serotypes were 19F (67.46%), followed by23F (10.32%), 19A (9.52%), 6A/B (3.17%), 15A (2.38%), 9V (3.17%), 11A (1.59%) and 14 (0.80%), respectively. More than half of the pneumococcal strainswere non-susceptible to penicillin. The resistance rate to ceftriaxone and cefotaxime were 41.3% and 50.8%. The percentage of pneumococci strains resistantto clarithromycin, azi- thromycin, erythromycin, cotrimoxazole, tetracyclin, and clindamycin were more than 93% of all strains. All pneumococcal serotypes were highly resistant to clarithromycin, azithromycin, erythromycin, cotrimoxazole, and clindamycin. Conclusion: Our findings showed high antibioticresistance rates of the strains causing pneumococcal pneumonia, mostly macrolide resistance, among unvaccinated children.