Dynamic simulation and modeling of PCP transport between sediment and water

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Hydrolysis kinetics of atrazine and influence factors

The hydrolysis kinetics of atrazine in distilled water and leaching water from soil, and they influence factors were studied by incubation at 35degreesC and HPLC analysis method. The kinetic process of atrazine hydrolysis can be described by the first-order reaction law. The results showed that the hydrolysis rate constants k in leaching water and distilled water were 1.606 x 10(-3)/d and 1.055 x 10(-3)/d, respectively; the half-life of atrazine hydrolysis in distilled water at pH 3, pH 4.5 and pH 8 were 373 days, 522 days and 657 days respectively. The results also showed that the proton in reaction solution can catalyze the atrazine hydrolysis; humic acid and NH4+ etc. substances in aqueous solution can facilitate atrazine hydrolysis; rate constants of atrazine hydrolysis with humic acid and NH4NO3 were 2.431 X 10(-3)/d and 1.498 X 10(-3)/d respectively which were 2.3 and 1.42 times of control(1.055 X 10(-3)/d); anion NO3- can inhibit catalysis of humic acid to atrazine hydrolysis.

韶关市某污水处理厂氧化沟工艺高出水标准提标改造

韶关市某市政污水处理厂提标改造项目规模10.0×104m3/d,出水标准由《城镇污水处理厂污染物排放标准》(GB 18918—2002)二级标准提升至一级A标准和广东省地方标准《水污染物排放限值》(DB 44/26—2001)第二时段一级标准中的较严值。针对现状氧化沟因采用表面曝气而氧气利用率低、污泥大量沉积在池底的问题,对氧化沟进行了技术改造,改用底部微孔曝气器,并增设曝气生物滤池+上向流反硝化滤池深度处理单元,实际出水水质稳定达到了《地表水环境质量标准》(GB 3838—2002)Ⅲ类标准(TN除外)。

曝气生物滤池及模块化装备用于城市黑臭水体治理

惠州某河道主要支流水污染治理项目实施了截污、补水工程,以超磁+曝气生物滤池为核心工艺,将截留污水进行就地处理排回河道,实现水体的净化及循环流动,满足生态景观要求。实际工程运行结果表明,曝气生物滤池技术具有停留时间短、占地小的特点,处理后出水水质优于《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准,其中COD、NH_(3)-N达到《地表水环境质量标准》(GB 3838—2002)Ⅴ类标准,同时采用模块化装备的建造模式,安装便捷,建设周期短,可异地搬迁,尤其适用于城市黑臭水体治理分散式就地处理工程。

上向流反硝化深床滤池用于污水厂提标改造

广东省某水质净化厂一期工程原采用SBR+纤维转盘滤池为主体的工艺,提标改造后要求主要出水指标达到《地表水环境质量标准》(GB 3838—2002)的Ⅴ类标准(TN≤15 mg/L),实际出水TP偶尔超标,TN严重超标。提标改造工程在现有SBR工艺后端新增上向流反硝化深床滤池模块化水处理装备,出水COD≤30 mg/L、BOD_(5)≤6 mg/L、TN≤12 mg/L、TP≤0.3 mg/L、SS≤5 mg/L,达到了地表水准Ⅳ类标准,表明上向流反硝化深床滤池脱氮除磷效果好,尤其是脱氮效率较高,最大TN去除量高达29.4 mg/L,相应的反硝化负荷达到2.08 kgNO_(3)^(-)-N/(m^(3)·d)。

两级上向流生物滤池模块化装备用于污水厂提标改造

部分城市生活污水处理厂的进、出水水质随季节性波动较大。以山西省平定县县城污水处理厂为例,按《地表水环境质量标准》(GB 3838—2002)准Ⅴ类(TN≤10 mg/L)标准考核,该污水厂夏季出水TN不能达标,冬季NH3-N不能达标,通过新增两级生物滤池的深度处理工艺,采用上向流生物滤池及专有的布水布气系统,可根据水质处理需求实现硝化与反硝化模式的切换,保证TN及NH3-N全年稳定达标。该项目采用智能模块化装备的建造模式,具有安装便捷、占地面积小、不受施工场地限制等优势。