Recovery of ammonium-nitrogen from landfill leachate as a multi-nutrient fertilizer

Abstract

This is the Pre-Published Version. 2 chard (Brassica rapa var. chinensis), water spinach (Ipomoea aquatica) and water convolvulus (Ipomea aquatica, I. reptans), were planted in completely decomposed granite soil and the MAP precipitate was applied as a fertilizer. The germination and growth of the selected vegetables in the pots with MAP showed significantly greater rates than those in the pots without MAP as control tests. The experiment also demonstrated that over-dosing about 2-8 times of MAP in the soil did not cause any problems with water spinach (Ipomoea aquatica) growth, due to its limited solubility in water. MAP application as a fertilizer did not result in more heavy metals in the vegetables than those from soil and model fertilizer, whereas the higher levels of P and Mg in the vegetables would stimulate vegetables' growth.This study confirmed the feasibility of recovering NH 4 + -N from landfill leachate effectively by chemical precipitation, and also the feasibility of applying the MAP precipitate as a multinutrient fertilizer for vegetable growth.

Recovery of nitrogen by struvite precipitation from swine wastewater for cultivating Chinese cabbage

“…7 illustrates that heavy metals including copper (Cu), mercury (Hg), chromium (Cr 6+ ) and zinc (Zn) were contained in all samples, whereas cadmium (Cd), arsenic (As) and nickel (Ni) were not detected. Similarly, no detection of Cd and As in application of struvite to vegetable cultivation was reported in the previous study in which struvite recovered from landfill leachate was used in growing vegetables (Li and Zhao, 2003). For Cu and Hg, their concentrations in struvite pots were slightly lower than in complex fertilizer pots.…”

“…5b, it was clear that the addition of struvite significantly increased the average fresh and dry weights of Chinese cabbage than control. It is well documented by previous studies that the vegetables grown in struvite pots have had much higher growth rates than control pots (without addition of external nitrogen and phosphorus) (Li and Zhao, 2003;Diwani et al, 2007; Ganrot et al, 2007;Yetilmezsoy and SapciZengin, 2009). Also, the average fresh and dry weights of Chinese cabbage in struvite pots ranked second in the experimental group.…”

“…After 32 days the plants were harvested from each pot and weighed before and after drying (in an oven set at 105 for 24 hours) to determine their fresh and dry weight. As conducted by Li and Zhao (2003), the Chinese cabbages were sprayed with distilled water to wash the dust off prior to harvesting. The level of heavy metals and nutrients in dry vegetables were also analyzed.…”

“…Although struvite has been qualified as a fertilizer, as mentioned above, to the best of our knowledge, the plant availability and fertilizer value of struvite precipitate obtained from swine wastewater was never tested before. A few fertilizer studies using struvite recovered from semiconductor wastewater, poultry manure wastewater and landfill leachate have just been reported (Li and Zhao, 2003;Yetilmezsoy and Sapci-Zengin, 2009;Ryu et al, 2012aRyu et al, , 2012b.…”

Ammonium Removal from Landfill Leachate by Means of Multiple Recycling of Struvite Residues Obtained through Acid Decomposition

“…The leachates generated as result of water infiltration and decomposition of organic matter in landfills of urban wastes are wastewaters with one of the highest polluting potentials [1][2][3][4][5]. Their uncontrolled disposal can produce severe deterioration of quality of soil and water bodies [4].…”