The performance of a combined nitritation-anammox reactor treating anaerobic digestion supernatant under various C/N ratios

A combined nitritation–anammox reactor was developed to treat the digestion supernatant under various C/N ratios. Due to the difficulties for heterotroph to utilize the refractory organics, the reactor presented relatively stable performance with increasing supernatant addition. Nevertheless, the adverse effects of supernatant would accumulate during the long-term operation and thus weakened the activity and shock resistance of microbes,which further led to the gradual decrease of reactor performance after 92 days' operation.Under this circumstance, supernatant with volatile fatty acids(VFAs) residuals was further introduced into the reactor to investigate the performance of combined nitritation–anammox process with VFA addition. With the appearance of VFAs, the nitrogen removal performance gradually restored and the reactor finally achieved stable and efficient performance with C/N ratio of 0.35. The VFA residuals within 150 mg/L in the supernatant served as the extra electron donors and stimulated the heterotrophic denitrification process, which was vital for the enhancement of reactor. The nitrogen removal rate and total nitrogen removal efficiency reached 0.49 kg N/(m3·day) and 88.8% after 140 days' operation, respectively. The combined nitritation–anammox reactor was proved suitable to treat digestion supernatant.     

地基上受化学污染发生胀害工程实例的试验研究

介绍了大冶有色金属公司饮料厂汽水车间地基土发生胀害原因的调查及试验分析。揭示了该地基土因受化学污染发生膨胀的机理,为治理已有裂缝和防止裂缝进一步发展,确保该建筑物安全使用提供了依据。     

辐射分解处理废水中的苯酚

采用辐射分解法处理废水中的苯酚,分别测定了辐照时间,剂量率,苯酚起始浓度,溶液pH及加入H2O2对苯酚去除率的影响.结果表明,去除率随辐照时间的延长而提高;总剂量一定的条件下,低剂量率下苯酚降解完全;当苯酚浓度较低时,去除效果较好.pH为中性条件下的去除率大于酸性和碱性;加入一定浓度的H2O2可使苯酚的去除率达到100%.     

混凝吸附法深度处理焦化废水

采用混凝吸附法对丹东某焦化厂的焦化废水进行深度处理。混凝剂为聚合氯化铝,助凝剂为聚丙烯酰胺,吸附剂为粉煤灰,当聚合氯化铝的投加量为0.4g/L,聚丙烯酰胺的投加量为4mg/L,粉煤灰的投加量为0.9g/L时,采用混凝剂和吸附剂同时加入的方式,可使COD值降至41mg/L、色度为50倍,达到辽宁地方排放标准,处理成本仅为0.74元/t。     

废焦油沥青的回收利用研究

采用混合乳化剂和超声乳化法 ,以炭素厂废焦油沥青为原料生产沥青乳化燃料。分别考察了调配剂用量、不同HLB值乳化剂、乳化剂用量、加水量等条件对乳化过程的影响 ,并对乳化燃料的粘度和稳定性进行了测定 ,制得的沥青乳化燃料 4 0℃粘度仅为 36 0mPa·s,在常温下放置 7d无水析出 ,放置一个月后稳定性良好 ,使废焦油沥青得到了合理的回收利用     

Cost–benefit analysis of construction waste source reduction: a system dynamics approach

Environmental Science and Pollution Research - Construction waste (CW) source reduction is a crucial strategy to address the sustainability issue of the construction industry. The economic benefit...     

Purification of leachate from sludge treatment beds by subsurface flow constructed wetlands: effects of plants and hydraulic retention time

Environmental Science and Pollution Research - Sludge treatment beds (STBs) have been used widely in many countries due to low energy consumption, low operating and maintenance costs, and better...     

啶酰菌胺在斑马鱼体内的富集特性及其对SDH和复合物Ⅱ活性的抑制

为进一步探索啶酰菌胺对水生生物的毒性,选择斑马鱼为供试生物,采用半静态法,研究了啶酰菌胺在斑马鱼体内的富集与消除规律及对其肝脏和鳃的毒性作用。结果表明,斑马鱼暴露于0.08、0.32 mg·L~(-1)中,14 d后均达到富集平衡,28 d生物富集系数(BCF_(28 d))分别为35.50和36.72。在0.16、0.32 mg·L~(-1)浓度下,斑马鱼的比肝重(HSI)和比鳃重(BSI)均明显高于对照组,而肝脏和鳃中琥珀酸脱氢酶(SDH)和线粒体呼吸链复合物II活性均明显低于对照组,浓度低于0.08 mg·L~(-1)时,对斑马鱼无明显影响。由此可知,啶酰菌胺对斑马鱼为中等富集性,并对其肝脏和鳃有一定毒性作用。     

饮用水中蓝藻毒素污染研究进展

日趋严重的水体富营养化已成为全球性的环境问题,藻类及藻毒素给传统净水工艺带来了诸多不利影响,增加了水处理难度.对饮用水中蓝藻毒素去除技术进行了具体的论述,系统分析了各种技术的去除效果和局限性,并对藻毒素研究前景进行了展望.     

A/DAT-IAT生物膜工艺与活性污泥法处理高含盐废水对比试验

主要研究A/DAT-IAT(前置厌氧/好氧-间歇曝气池)生物膜工艺的启动,并将该工艺处理高含盐废水的结果与活性污泥法进行比较。结果表明,在总水力停留时间(HRT)为13.5h、pH=7.5、25℃、含盐量为60g/L(以NaCl计)的条件下,A/DAT-IAT生物膜工艺的启动时间为8d,比活性污泥法缩短了10d左右。待反应器运行稳定后,A/DAT-IAT生物膜工艺对CODCr、NH4+-N、PO43--P的去除率分别为80.3%、79.0%、92.4%,反应器内微生物量为11.3g/L;A/DAT-IAT生物膜工艺与活性污泥法相比,CODCr、NH4+-N、PO43--P去除率分别提高了5.8%、11.2%、16.9%,微生物量增加了3.1g/L。