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Benefits and Risks of Liquid Sewage Sludge Recycling in Agricultural Spreading – A Case Study of WWTP of Skhirat, Morocco

Achkir Abdelmajid, Aouragh Abdelhakim, El Mahi Mohammed, Lotfi El Mostapha, Kabriti Mohamed, Abid Abdesalam, El Moussaoui Tawfik, Yagoubi Maâmar

Journal of Ecological Engineering

2023

Vol. 24, nr 1

277--288

The sewage sludge recycling as an agricultural land resource has received a great deal of attention worldwide. This practice has highly increased because of ever-increasing municipal wastewater production and the awareness of its fertilizing potential as amendment resources. However, there is a concern about land spreading linked mainly to health associated risks due to the presence of diverse pollutants. Thus, sewage spreading management is a key factor the guarantees benefits and avoids risks. The present work aimed to investigate the benefits and risks of sewage sludge (SS) application on agricultural land. To this end, physicochemical main parameters and bacteriological indicators, fecal coliform (FC) and fecal streptococcus (FS), of the sewage sludge generated form WWTP of Skhirat, Morocco, were performed during the period 2018–2019. The obtained results of physicochemical parameters reveal high concentration of organic matter in SS, which reach 96.3 mg/l, and in nutrients. Indeed, total Kjeldahl nitrogen TKN reaches a maximum of 3791 mg/l, potassium K+ reaches 58.71 mg/l. In addition, the average content of FC and FS are around 5.40 CFU/ml and 5.85 CFU/ml, respectively, whereas total phosphorus reaches 508.25 mg/l. In addition, concentrations of micronutrients such as Cl-, SO42-, Ca2+, Mg2+, and Na+ were high, which is interesting and could benefit for both soils and plant. Furthermore, this sewage sludge contains high concentration of heavy metals, mainly zinc and copper which could limit reuse in land spreading. The obtained results were compared to the applied standards and directives established within the framework of the agricultural spreading.

Problemy w usuwaniu azotu amonowego ze ścieków i wód osadowych w oczyszczalni ścieków komunalnych

Piastowski K.

Ekologia i Technika

2009

R. 17, nr 3

91-96

Usuwanie związków azotu ze ścieków stanowi duże wyzwanie dla oczyszczalni ścieków, ze względu na wrażliwość procesu nitryfikacji. Zmiany temperatury, jakości dopływających ścieków oraz problemy eksploatacyjne procesu osadu czynnego wpływają na obniżenie skuteczności usuwania jednego z ważniejszych biogenów. Stałym, ale bardzo niestabilnym ilośclowo i jakościowo źródłem azotu amonowego są również wody osadowe z procesu fermentacji osadów ściekowych. W pracy przedstawiono na przykładzie koszalińskiej oczyszczalni ścieków "Jamno" efektywność usuwania azotu ze ścieków w okresie całego roku, wpływ wybranych parametrów na proces oraz określono wielkość ładunku azotu amonowego generowanego w części osadowej, recyrkulowanego do oczyszczalni ścieków.

Nitrogen removal from sewage is a frequent problem of municipal wastewater treatment plant due to nitrifying bacteria sensitivity. Nitrogen oxidation efficiency is disturbing by temperature fluctuation, sewage quality, operating problems of activated sludge process and liquid sludge. This waters from sludge digestion are important source of ammonia nitrogen but their quality and amount are very inconstancy. The paper presents efficiency of nitrogen removal from sewage in Wastewater Treatment Plant "Jamno" in 2007. Author showed influence of selected parameters on nitrification and determined quantity of ammonia nitrogen load generated at sewage sludge treatment area, recycled to biological treatment plant.