Evaluation of Suitability of Treated Sewage Sludge for Maize Cultivation

Abstract

The worlds growing population demands more food and creates more waste. Economically viable and environmentally friendly would be to use sewage sludge for agricultural production. There are several limitations for this use – heavy metal content, pathogenic microorganisms, helminths etc.. The different methods of treatment of sewage sludge helps to overcome this problem. The aim of the study is to find the effects of treated sewage sludge on the growth of maize and changes in soil biological activity. Experiments were carried out with dry sewage sludge preparation (SSP) in the such combinations 1) SSP, 2) SSP+PK, 3) SSP+NPK. Controls- loamy soil without additional fertilizer, soil mixed with mineral fertilizer (Kristalon 18:18:18). Maize (Zea mays var. saccharata ‘Elan F1’) was grown. Experiments were arranged in 1L vegetation containers placed in open area with additional watering. Plant growth parameters and soil enzymatic activity was detected. The SSP alone and in combination with potassium and phosphorus fertilizers does not provide the maize with the mineral nutrients in appropriate value, therefore, the combination of SSP with nitrogen containing fertilizers significantly improves plant growth and promotes development. The use of SSP increases the microbiological activity of the soil. This can have a beneficial long-term effect on the mineral nutrition of plants.

Hazardous Waste Management

“…Therefore, urease inhibition is one of the strategies worldwide to maintain soil fertility [72]. In our experiments, combination of dry SS with nitrogen-containing fertilizer resulted in inhibition of urease activity in loamy soil during the vegetation experiment with maize [73].…”

“…It elevated brain-derived Hazardous Waste Management 12 neurotrophic factor levels and lessened oxidative stress through its sweeper effect and removed free radicals in the brain tissue of fetal rats [49]. It also attenuated inflammation, apoptosis and behavioural neurotoxic effects in rats [37,73]. Linoleic Acid (LA) is an essential omega-6 fatty acid with antioxidative, anti-inflammatory and neuroprotective effects [75].…”

“…Therefore, sediment properties like particle size and concentration as well as contaminant shape (sulphides or organic carbon) can affect the bioavailability of the contaminant. Also, in most environments, temperature and type of organism activity or population density can increase or decrease contaminant exposure or bioavailability for bioremediation [61,[73][74][75].…”

“…However, genetically modified organisms (GMOs) or genetically engineered microorganisms (GEMs) have shown potential in the biotransformation of contaminants in soil [57]. Biotransformation processes occur through oxidation, reduction, denitrification, condensations, isomerisation, hydrolysis, sulphidogenesis, methanogenesis, functional group introduction, and new bonds, as illustrated in Figure 7 [73].…”

Інноваційне Вирішення Проблеми Нейтралізації Осаду Стічних Вод

“…У ході досліджень, здійснених у співпраці з Institute of Soil and Plant Sciences, Latvia University of Life Sciences and Technologies, University of Latvia, Institute of Microbiology & Biotechnology, вивчені біологічні, фізико-хімічні параметри та мінеральний склад зразків опадів і отриманого добрива, проведені експерименти на рослинах [3][4][5]. На підставі досліджень зразків осаду, взятих у різних регіонах України, ЄС, СНД, Близького Сходу і Перської затоки, і зразків вироблених добрив можна констатувати відповідність регульованих показників національним нормативам для застосування при лісопосадках, в квітникарстві, для вирощування технічних, декоративних, сидеральних, кормових і зернових культур, в особистому підсобному господарстві.…”