Quality in papaya fruit produced with treated domestic sewage

ABSTRACT When carrying out this study, the aim was to evaluate physicochemical and microbiological quality in fruit of the papaya Tainung 1, produced under different irrigation time ratios with water from the supply (AA) and from domestic sewage which had been treated first in a septic tank and then with anaerobic filters (AE). The experimental design was of randomised blocks, with four treatments and six replications. The treatments consisted of T1 (100% AA plus a recommended fertiliser), T2 (67% AA plus 33% AE), T3 (33% AA plus 67% AE) and T4 (100% EA). The physicochemical and microbiological quality of the fruit was evaluated using the following parameters: pulp thickness (EP), pulp firmness (PF), total soluble solids (SS), pH, titratable acidity (TA), SS to AT ratio and the population levels of Salmonella ssp. and total coliforms. It was found that the applied irrigation time ratios with AA and AE resulted in no significant changes to the physicochemical characteristics of the papaya fruit, showing that the values obtained meet the standards required for marketing and in natura consumption. The microbiological quality of papaya fruit produced with AE is acceptable for human consumption, as there was an absence of Salmonella sp. and total coliforms.

摘要 本研究旨在评估不同灌溉时间配比下，以市政供水（AA）及经化粪池预处理后再经厌氧滤池处理的生活污水（AE）灌溉种植的台农1号番木瓜果实的理化与微生物品质。本实验采用随机区组设计，设置4个处理组与6次重复。各处理组分别为：T1（100%市政供水+推荐施肥方案）、T2（67%市政供水+33%处理后生活污水）、T3（33%市政供水+67%处理后生活污水）及T4（100%处理后生活污水）。本研究通过以下参数对番木瓜果实的理化与微生物品质开展检测：果肉厚度（EP）、果肉硬度（PF）、可溶性固形物总量（SS）、pH值、可滴定酸度（TA）、可溶性固形物与可滴定酸度比值，以及沙门氏菌属（Salmonella ssp.）菌群数量与总大肠菌群数。研究结果显示，采用市政供水与处理后生活污水的灌溉配比并未对番木瓜果实的理化特性造成显著影响，所得各项指标均符合商品化销售及鲜食的相关标准。采用处理后生活污水灌溉所得番木瓜果实的微生物品质符合人类食用要求，未检出沙门氏菌（Salmonella sp.）及总大肠菌群。