Ball milling and ultra-sonication size reduction procedures were applied to granular ferric hydroxide (GFH) obtain two micro-sized adsorbents. These adsorbents GFH investigated improve the removal of phosphates from water. The procedures, using method, allowed a 0.5–2 mm 0.1–2 µm total disaggregation structure. Using an method yielded final 1.9–50.3 with partial disaggregation. Langmuir model c...

An approach is presented for the on-site treatment of diluted swine waste. The approach (1) incorporates anaerobic digestion with an anaerobic sequencing batch reactor (ASBR) to stabilize waste, reduce odor, and reduce solids and organic compounds, while producing biogas; (2) increases the ortho-phosphate concentration of the anaerobic digester effluent by enhanced biological phosphorus removal...

Experimental investigations were conducted to evaluate the performance 01 n"nofillration fOr tertiary level phosphate removal from wastewater. A flat sheet type Oesal-5 thin 5lul nanofi)tration membrane in a plate and frame module, was IJsed. The inIIuc.nce of pressure. initial feed roncentntion, competing compounds, on nanoflllration performance were determined. TIlecxperimelltal study range o...

Batch tests were performed to evaluate the effects of inorganic anion competition on the kinetics of arsenate (As(V)) and arsenite (As(III)) removal by zerovalent iron (Peerless Fe0) in aqueous solution. The oxyanions underwent either sorption-dominated reactions (phosphate, silicate, carbonate, borate, and sulfate) or reduction-dominated reactions (chromate, molybdate, and nitrate) with Peerle...

Simultaneous nitrification and denitrification (SND) under low dissolved oxygen (DO) and anaerobic/aerobic(anoxic) enhanced phosphorus removal (EBPR) are two processes that can significantly reduce the energy and carbon required for nutrient removal. The combination of the two processes is expected to achieve biological nutrient removal with minimal requirement of oxygen and carbon. In this stu...

Treated wastewater discharged from more than 400 onsite wastewater treatment systems (OWTS) near the Civic Center area of Malibu, California, 40 km west of downtown Los Angeles, composes 28% of the recharge to a 3.4 km(2) alluvial aquifer. On the basis of δ(18) O and δD data, the fraction of wastewater in some samples was >70%. Ammonium and nitrate concentrations in water from 15 water-table we...

In plant nutritional studies. it is often necessary to prepare nutrient solutions that are free of a particular micronutrient. It is occasionally possible to obtain batches of nuitrient salts from commercial sources that are sufficiently loyv in a given micronutrient to be used in such1 deficiency studies. But as pointed out by Hewitt (2), it is muich more advisable in these instances, to use a...

The adsorption of phosphate onto mesoporous TiO2 was investigated in order to reduce phosphorus concentrations in wastewater and provide a potential mode of phosphorus recovery. Three equilibrium isotherms were used to optimize and properly describe phosphate adsorption (R > 0.95). The maximum capacity of phosphate on the adsorbent was found to be 50.4 mg/g, which indicated that mesoporous TiO2...

Experiments in a lab-scale SBR were conducted to demonstrate the feasibility of using an internal carbon source (non-digested pig manure) for biological nitrogen and phosphorus removal in digested piggery wastewater. The internal C-source used for denitrification had similar effects to acetate. 99.8% of nitrogen and 97.8% of phosphate were removed in the SBR, from an initial content in the feed...

We investigated the removal of nitrogen and phosphate from the effluent of a sewage treatment plant over a long-term operation in bioreactors packed with different combinations of wood and iron, with a trickling filter packed with foam ceramics for nitrification. The average nitrification rate in the trickling filter was 0.17 kg N/m3∙day and remained at 0.11 kg N/m3∙day even when the water temp...