利用4种不同成分的培养基从活性污泥中共分离出39株菌株,通过考察培养条件最终在4种培养基中各筛选得到一株具有较高絮凝活性的菌株,分别命名为A11,B6,C5,D6;同时考察了絮凝剂用量及助凝剂CaCl2的投入量对絮凝效果的影响,结果表明:A11絮凝剂投加量在0.2mL,CaCl2用量在0.8mL;B6絮凝剂投加量在0.2mL,CaCl2用量在1.0mL;C5絮凝剂投加量在0.25mL,CaCl2用量在1.0mL;D6絮凝剂投加量在0.15mL,CaCl2用量在1.0mL;分别具有良好的絮凝效果。

In a H3PO4-Na2HPO4 buffer medium of pH 2.0,fading of color due to the reaction of sodium indigo disulfonate with ozone was observed.It was found that the magnitude of decrease in absorbance measured at 610 nm kept a linear relationship with the concentration of ozone in the range of 0.12-3.0 mg·L-1.Apparent molar absorptivity of the reaction system was found to be 1.8×104L·mol-1·cm-1.Based on these facts,a spectrophotometric method for determination of ozone in water was proposed.Water samples were analyzed by the present method,giving values of RSD′s(n=20) in the range of 0.6% to 2.8%.

The effects of the different polyacrylamides as flocculent on sludge dewatering are analyzed based on the experiments of sludge flocculated,the determination of sludge specific filtration resistance(SFR) and the test of sludge filtration.The results show that properly adding flocculent will reduce SFR and improve the sludge dewatering performance.

Advanced treatment of drilling wastewater was carried out by chemical coagulation-iron-carbon microelectrolysis-electrodialysis process.The experimental results show that: Wastewater pH and reaction time are the main factors;The COD removal rate is 50% when the wastewater pH is 1.5 and the reaction time is 120 min;In the process for Cl-removal by electrodialysis,when the direct current effluent mode is adopted and the influent flow is 20 L/h,the operation voltage is 30 V and the running time is 15 min,the Cl-removal rate can reach 75%;When the recycle effluent mode is adopted,the running time is the main factor and when it is more than 60 min,the mass concentration of Cl-in the effluent is below 350 mg/L,which can meet the third grade of the local wastewater discharge standard DB51/190-1993.