Abstract：
Didecyldimethylammonium chloride (DDAC) and polyhexamethylene guanidine (PHMG) exhibit high antimicrobial activity and are widely used as biocidal agents in chemical toilet additives for the management of fecal sludge (FS). Disposal of such biocide-treated FS to a wastewater treatment plant (WWTP) is a major environmental problem. It is possible to reduce environmental damage through the use of biocidal agents, which easily decompose after performing their main biocidal functions. In this work, it is proposed to use the fact of a gradual increase in pH of FS from the initial 7.5 to 9.0-10.0 due to the decomposition of urea. Six biocidal compounds were selected that are capable of rapidly degrading in an alkaline environment and one that naturally degrades upon prolonged incubation. Four of them: bronopol (30 mg/L), DBNPA (500 mg/L), Sharomix (500 mg/L), and sodium percarbonate (6000 mg/L) have shown promise for environmentally friendly management of FS. In selected dosage, they successfully reduced microbial activity under both aerobic and anaerobic conditions and are cost-effective. After 10 days of incubation, degradation of the biocide occurred as measured by biological oxygen demand (BOD5) in biocide-treated FS. Such FS can be discharged to WWTP without severe damage to the activated sludge process, the need for dilution and additional procedures to neutralize toxicity.
摘要：
二酰基二甲基氯化铵（DDAC）和聚六亚甲基胍（PHMG）具有很高的抗菌活性，被广泛用作化学厕所添加剂中的杀生物剂，用于管理粪便污泥（FS）。将这种杀生物剂处理的FS处置到废水处理厂(WWTP)是主要的环境问题。通过使用杀生物剂可以减少对环境的破坏，在执行其主要的杀生物功能后容易分解。在这项工作中,由于尿素的分解，建议使用FS的pH从最初的7.5逐渐增加到9.0-10.0的事实。选择了六种杀生物化合物,其能够在碱性环境中快速降解,并且一种在延长孵育时自然降解。其中四个：支气管醇（30毫克/升），DBNPA（500mg/L），Sharomix（500毫克/升），和过碳酸钠（6000mg/L）已显示出环保管理FS的希望。在选定的剂量中，他们成功地降低了微生物活性在好氧和厌氧条件下，具有成本效益。经过10天的孵化,通过在杀菌剂处理的FS中的生物需氧量（BOD5）测量，杀菌剂的降解发生。此类FS可以排放到污水处理厂，而不会对活性污泥工艺造成严重破坏。需要稀释和额外的程序来中和毒性。
