Simultaneous sulfate reduction and metal precipitation in an inverse fluidized bed reactor
On-line estimation of the dissolved zinc concentration during ZnS precipitation in a continuous stirred tank reactor (CS...
In this paper a method is presented to estimate the reaction term of zinc sulphide precipitation and the zinc concentration in a CSTR, using the read-out signal of a sulphide selective electrode. The reaction between zinc and sulphide is described by a non-linear model and therefore classical observer theory cannot be applied directly, as this theo...
Control of the sulfide (S2-) concentration for optimal zinc removal by sulfide precipitation in a continuously stirred t...
Precipitation of Zn2+ with S2− was studied at room temperature in a continuously stirred tank reactor of 0.5 l to which solutions of ZnSO4 (800–5800 mg Zn2+/l) and Na2S were supplied. The pH was controlled at 6.5 and S2− concentration in the reactor was controlled at set point values ranging from 3.2x10−19 to 3.2x10−4 mg l−1, making use of an ion-s...
Innovative developments in the selective removal and reuse of heavy metals from wastewaters
Sulphide precipitation of heavy metal containing wastewaters results in low effluent concentrations. However, sulphide precipitation is not widely applied in practice because the dosing of sulphide cannot adequately be controlled. A new process was developed where the combination of a sulphide-selective electrode (pS-electrode) and pH electrode con...
Physico-chemical and functional properties of potato proteins
Key words: potato proteins, patatin, protease inhibitors, solubility, structure, pH, temperature, ethanol, ionic strength, phenolic compounds, foams, emulsionsIn potato starch manufacture an aqueous byproduct remains that is called potato fruit juice (PFJ). On a dry matter basis PFJ contains about 20-25 % protein and amino acids, 15 % sugars, 20 % ...
Impact of location of CaCO3 precipitation on the development of intact anaerobic sludge
The development of intact anaerobic granular sludge was studied in UASB reactors under varying conditions of CaCO3 precipitation and biomass yield. Varying precipitating quantities were obtained using different calcium concentrations in the influent and different biomass yields were obtained by feeding with completely or partly acidified substrate....
Control of calcium carbonate precipitation in anaerobic reactors
Anaerobic treatment of waste waters with a high calcium content may lead to excessive precipitation of calcium carbonate. So far, no proper methods were available to predict or reduce the extent of precipitation in an anaerobic treatment system. Moreover, it also was not clear to what extent precipitation in an anaerobic reactor can be tolerated be...
Mest indikken met zonne-energie
Om mestafzetkosten te verlagen kan de mest op het varkensbedrijf ingedikt worden. Mestsilo's kunnen hiertoe voorzien worden van een zonlichtdoorlatende afdekking. Hierbij wordt de verdamping gestimuleerd.
Canopy interactions in a Douglas fir forest. Estimating dry deposition from canopy wetness, throughfall and wet depositi...
CORRELACI : identification of traditional and air pollution related stress factors in a douglas fir ecosystem : the acif...
