Assessment of Differential Sheer Stress Indices in Agricultural Soil Receiving Cafeteria Effluent

Chijioke Ezenwelu, Chisom Okeke, Onyeka Udemezue, Ogochukwu Ngwu, Joy Ogana, Emeka Oparaji
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Abstract

This study looked at assessing the impact of waste water from a cafeteria in University of Nigeria, Nsukka on soil physicochemical properties and quality marker enzyme activity. Physicochemical analysis of the soil before and after irrigation with the domestic waste water from the cafeteria showed the presence of the following: pH 7.4 and 6.65, conductivity 488 and 792 respectively. Dissolved mineral contents were found in the following order: Cl>Ca>Fe>SO 4 >Mg>Cu>K>Pb>PO 3 while heavy metals of Hg, As and Cd were found at below detectable limit range (BDL) in both the irrigated and non-irrigated soil. Total organic matter (TOM) and total organic carbon (TOC) contents were found at 91.66, 22.05 and 76.85, 179.93 in the various treatments, respectively. BOD 5 of the waste water was found at 5.2mg/ml with initial dissolved oxygen concentrations at 6.2 mg/ml. Dissolved mineral concentrations such as Cl, Ca, Mg, PO 3 , Cu, Fe and SO 4 were found richly in abundance. Heavy metals such as Pb was found in trace quantity were as Cd, As and Hg were found in non-detectable range. TDS, TSS and TS were recorded at 23036, 396.5 and 23433. Analysis of soil enzymes showed the activity of the lipase, urease, peroxidase and catalase with corresponding OD reading of 0.403, 0.611, 0.652 and 0.817 respectively. There was an increase of lipase, urease and peroxidase after the irrigation with the waste with OD of 0.610, 0.677 and 0.712 respectively while catalase activity was reduced.
对接受食堂污水的农业土壤的不同剪切应力指数进行评估
本研究旨在评估尼日利亚恩苏卡大学食堂废水对土壤理化性质和质量标记酶活性的影响。用食堂生活废水灌溉前后的土壤理化分析表明:pH 值分别为 7.4 和 6.65,电导率分别为 488 和 792。溶解矿物质含量按以下顺序排列:而在灌溉土壤和非灌溉土壤中发现的重金属汞、砷和镉含量均低于检测限值(BDL)。在不同处理中,总有机物(TOM)和总有机碳(TOC)含量分别为 91.66、22.05 和 76.85、179.93。废水的生化需氧量(BOD)5 为 5.2 毫克/毫升,初始溶解氧浓度为 6.2 毫克/毫升。溶解矿物质(如 Cl、Ca、Mg、PO 3、Cu、Fe 和 SO 4)含量丰富。镉、砷和汞在检测不到的范围内。TDS、TSS 和 TS 分别为 23036、396.5 和 23433。土壤酶分析表明,脂肪酶、脲酶、过氧化物酶和过氧化氢酶具有活性,相应的 OD 读数分别为 0.403、0.611、0.652 和 0.817。用废物灌溉后,脂肪酶、脲酶和过氧化物酶的活性有所提高,OD 值分别为 0.610、0.677 和 0.712,而过氧化氢酶的活性则有所降低。
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