利用H+浓度变化控制含Cl-的氨氮废水的电解时间

采用电化学间接氧化法处理含Cl^-的中高浓度氨氮废水，针对不同浓度的氨氮废水的电解时间的控制，提出利用废水的H⁺浓度变化控制氨氮废水实际处理时间.从理论计算及对模拟和实际氨氮废水进行电解分析发现：当废水氨氮还没有完全降解时，每一个NH₄⁺降解的过程中会生成一个H⁺，c（H⁺）随着时间线性上升；当氨氮刚好完全降解时，c（H⁺）达到最大值；此后继续电解且废水pH＜7时，电解过程形成的OH^-会持续消耗H⁺，c（H⁺）随着时间线性下降.利用pH计实时监测废水的pH值，通过程控信号转换器进行c（H⁺）与pH值的换算，将pH值信号转化为c（H⁺）信号，可提高决策的准确性和灵敏度.

Control of electrolysis time of ammonia nitrogen wastewater containing Cl- by H+ concentration change

The indirect electrochemical oxidation method was used to treat high or medium concentration ammonia nitrogen wastewater containing Cl^-. The change of H⁺ concentration of wastewater was used to control the electrolysis time of different concentration ammonia nitrogen wastewater. Based on theoretical calculation and electrolytic analysis of simulated and actual ammonia nitrogen wastewater, it was found that when the ammonia nitrogen in wastewater had not been completely degraded, one H⁺ would be generated in the degradation process of each NH₄⁺, c(H⁺) would rise linearly with time; when the ammonia nitrogen just completely degraded, c(H⁺) would reach the maximum value; after that, when the electrolysis continued and the pH of wastewater was less than 7, the OH^- formed in the electrolysis process would continue to consume H⁺, and c(H⁺) declined linearly with time. Using pH meter to monitor the pH of waste water in real time, and through the program-controlled signal converter, the pH value signal was converted into c(H⁺) signal, which could improve the accuracy and sensitivity of decision-making.