Method of treating wastewater containing hardly decomposable harmful substances
A technology that is difficult to decompose and has harmful substances. It is used in separation methods, solid waste removal, adsorption water/sewage treatment, etc.
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Embodiment 1 and comparative example 1
[0133] The polyaluminum chloride solution as a flocculant was continuously added to the dioxin-containing solution at a flow rate of 1 m by injection in an amount of 1 ppm polyaluminium chloride content. 3 / hr of flowing wastewater, the resulting solution was filtered for 1 hour through a solid-liquid separator with a capacity of 10 L and equipped with a membrane area of 0.25 m 2 bag filter. After filtering, the flocs adhering to the filter were collected with a spatula, mixed thoroughly, and after drying, the amount of dioxin was measured and defined as blank (comparative example 1).
[0134] In addition, put 1 kg of sodium persulfate and 600 g of sodium hydroxide into water up to 10 L, and make it react for 6 hours in a solid-liquid separator in a state where flocs stick to the filter, keeping the temperature at 80-95 ℃ range. After the reaction, part of the flocs adhering to the filter were collected with a spatula, mixed well, and after drying, the residual dioxin was ...
Embodiment 2 and comparative example 2
[0143] The suspension containing 250 g / L diatomaceous earth was poured in 1 L through valve 6 into a solid-liquid separator with a capacity of 10 L and equipped with a membrane area of 0.25 m 2 The bag filter, as a result, pre-coats the surface of the bag filter with diatomaceous earth only by filtering this suspension. Subsequently, the polyaluminum chloride solution was injected into the dioxin-containing solution at a flow rate of 1 m with the amount of 1 ppm polyaluminum chloride content. 3 The / hr flowing wastewater was added continuously for 3 hours, whereby the resulting wastewater was filtered. After filtration, the container of the bag filter was opened and a part of the filter cake was taken as a sample from the filter, and after drying, the amount of dioxin was measured and defined as a blank (comparative example 2).
[0144] In addition, an aqueous solution combining 1.5Kg / 5L sodium persulfate and 1kg / 5L sodium hydroxide, 5L aqueous sodium persulfate solution, a...
Embodiment 3 and comparative example 3
[0146] Comparative Example 3 was carried out in a similar manner to Comparative Example 2, except that the polyaluminum chloride solution as a flocculant was continuously added to the wastewater by injection in an amount of 1 ppm polyaluminum chloride content and the aqueous solution of polyferric sulfate was also added at 10 ppm The amount of polyferric sulfate content was continuously added to the waste water by injection (comparative example 3).
[0147] Furthermore, the sample obtained in Example 3 was subjected to decomposition reaction in the same manner as in Example 2 (Example 3). The measurement data of the amount of dioxins for each of Comparative Examples 2 and 3 and Examples 2 and 3 are shown in Table 2, respectively.
[0148] Sample condition
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