Industrial waters plant testing

Except for the CMUs which were produced in an industrial block plant, the batches were completed following the same procedure. Before starting a typical concrete batch, the water, sand and pea gravel were adjusted for moisture content. The two aggregates and the plastic filler were introduced into the mixer and mixed for approximately 30 seconds. The cement and two-thirds of the total water were added and the drum was rotated for 2 minutes more. The rest of the water was added within the next 30 seconds. After two minutes the drum was stopped, and the slump test was performed. The drum was then scraped to loosen any material not previously mixed. It was restarted and rotated... 

A Study was carried out with a large number of individual and mixed waste waters in test plants at pressures of 150-200 bar, temperatures of 543-603 K (270-330 °C) and with variations of the chloride, sulphate, and phosphate concentrations, the pH values as well as the COD values (Chemical Oxygen Demand). The following metallic materials were examined in this study with regard to their suitability in wet oxidation plants for industrial waste waters chromium-nickel-molybdenum steel 1.4571 (X6CrNiMoTil7-12-2), titanium, tantalum, and nickel. None of the investigated materials was resistant at acidic pHs. At pH values > 7, titanium and tantalum were resistant, even in the presence of low fluoride concentrations and chloride concentrations of up to 100 g/1 [50]. 

In a Russian study of construction materials to test for their suitability for industrial waste water plants in which the samples were exposed for 8 h/d with stirring to the waste water media [Table 22], only the steel 06ChN28MDT (22-25 % Cr, 26-29... 

Anaerobic degradation of PHB and PHBV (8.4 mol% HV) in a mineral medium with sludge from a waste water plant of the sugar industry at 35 °C was tested by Reischwitz and co-workers [25]. In this case a significant degradation of the polyester powders (approximately 50 pm diameter) was observed also within three weeks, with no significant differences between PHB and PHBV. 

Long term experiments of one pass seawater desalination using our module have been carried out at Chigasaki Laboratory of Water Reuse Promotion Center under the supervision of Ministry of International Trade and Industry, Japan (4). A continuous long term test for 12,000 hours was successfully conducted with the m-value of 0.02. Another demonstration plant with an 800 m3/D capacity has also been operating over 3,000 hours at the recovery ratio of using the feed water of F.I. value of about 4. 

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