Wash water specification

Air emissions can be controlled during operation. Site-specific water treatment systems recycle wash water. 

Soil washing is based on the use of water-based leachates, which are recycled continuously in the machine. The end products are a relatively clean, coarser soil fraction and a wash water containing finer soil particles and most contaminants. The small levels of organic contamination remaining in the coarser materials are removed readily with heat. The wash water, depending upon the specific contaminants, responds to various traditional treatment methods, such as bioremediation, air stripping, chemical precipitation, or membrane separation. 

Plokhov, S., Matasova, I., Utkin, V., and Vodzinskii, V. (2002) Specific features of ion-exchange zinc(II) extraction from washing water of zinc plating. Russ.J. Appl. Chem., 75 (6), 950-... 

The dilution of sulphophenol is effected in special stoneware vessels. For 95 kg of sulphophenol 721. of wash water is added. The specific gravity of the sulphophenol after dilution should be 1.35. The diluted sulphophenol is left to settle and then filtered through a sand filter. The temperature of the sulphophenol which is to be nitrated should not be lower than 50°C which is necessary for initiating the nitration reaction. 

Paulownia charcoal. A light powder, which is easily scattered and has an apparent specific gravity of 0.12 g/cc. This value is the lowest for all the kinds of charcoal at present available. The dye adsorption power in water lies between pine charcoal, and hemp coal which has the largest. One analysis showed that it contained. 9% moisture and 2.5% ash. The pH value of the wash water(5 grams of charcoal / 30cc of water) was 7 5 A mixture of the paulownia charcoal, sulphur and potassium nitrate burns as well as the pine charcoal, but it produces less fire dust than the pine charcoal. 

Filter wash water approx. 1 kg/1 kg polymer Recovery column yield 98% (percentage recovered) Dryer feed 5% water, product specification 0.5% H2O Polymer losses in filter and dryer 1%... 

The quantification is based on multi level response factors covering both differences in extraction behaviour, volatility and GC/MS response of the compounds and of the deuterated internal standards. 1 Utre pentane washed water is spiked with 50 pg deuterated internal standards and normally 1,5,25 and 100 pg of the different target compounds. Calibration curves are automatically calculated and stored on the disk, and quantification is based on area of ion chromatogram of one specific mass for each compoimd. 

The elution tests were conducted in a water-jacketed glass column. The adsorbent was placed in the column and deionised water passed through the column to remove air pockets in the adsorbent bed. Hot water, heated to a specific temperature, was pumped through the outer jacket of the column when needed. A volume of 300-400 mL of eluant solution was prepared and pumped at a specified flow rate (bed volume per hour) into the bottom of the column and out the top. At the end of the test, DI (wash) water was pumped to collect residual aqueous gold. Some tests were ran on a shaker table by placing a loaded adsorbent into known composition of eluant for a pre-determined reaction time. 

One approach to reducing water consumption is to lower the pH of the biodiesel, either by direct acid addition or by adding acid to the wash water. Below pH 4.5, the soap dissolved in the biodiesel will be split into free fatty acids and salts. The free fatty acids stay with the biodiesel and as long as they do not exceed the Acid Value specification in ASTM D 6751 (0.5 mg KOH/g), they do not cause a problem. The salts are removed with a small amount of water (3 to 10%). 

---