制革厂采用铬鞣废液直接循环利用技术

采用高 分子聚脂 Ｐ Ｎ Ｓ 药剂，有效 地去除 了革鞣废 液中的杂 质，使之 能够循 环使用，即 节约了化工原 料，又减 少了废铬 液对综 合污水处 理的负 担，避免了 含铬污 泥对环境 造成的二 次污染     

水中BOD5快速测定

从BOD的特点分析BOD2的关系，通过BOD2与BOD5进行拟合，建立相关方程，利用方程，根据BOD2的值从而快速测定BOD5的值。本方法较严密，省时，可供大家研讨。     

纤维直接过滤去除原水藻类

以丙纶丝为滤料 ,以自制转鼓装置对高藻原水进行直接过滤除藻试验。结果表明 ,对Chl a及藻总数的去除率分别为 64 %— 95 % (平均 91% )和 82 %— 96% (平均 92 % ) ,对主要藻种的平均去除率均在 85 %以上 ,除藻效果明显。原水中藻类特征、试验运行工况条件直接影响对藻类的去除效果。筛分截留与吸附 -絮凝是试验装置过滤除藻的主要机理     

制浆,黑液碱回收试验研究

本文对造纸工业制浆黑液中的碱回收问题进行了探讨,在实验的基础上,提出了一种切实可行而且比传统的燃烧法投资更省的碱回收工艺,即将多效蒸发后的浓缩黑液经等离子处理后得到的黑粉,稀释后用离心过滤脱水的办法再进行碱回收。     

重油气化炭黑废水的处理

采用气浮－离心组合工艺处理炭黑废水，出水炭黑含量为５０ｍｇ／Ｌ，达到国家排放标准，离心后所得炭黑滤饼的含水量为９０－９２％。整个处理过程中不产生二次污染。     

超声粉碎-TOC/TN仪法直接测定污水处理厂废水中的总氮

污水处理厂废水经超声粉碎后,使用TOC/TN仪直接测定总氮。进样方式为带搅拌功能的自动进样,样品超声粉碎时间为30 min。处理前相对标准偏差小于2.35%,处理后相对标准偏差小于1.68%。处理前加标回收率为96.0%～98.5%,处理后加标回收率为94.5%～96.0%。检测限为0.050 mg/L。测定结果与国标法一致,两种方法的相对误差小于士1.3%。经t检验,两种方法的测定结果差异无统计学意义。方法简便、快速、无需复杂前处理。     

Characteristics and source attribution of PM2.5 during 2016 G20 Summit in Hangzhou: Efficacy of radical measures to reduce source emissions

A field campaign was conducted to study the PM_2.5 and atmospheric gases and aerosol's components to evaluate the efficacy of radical measures implemented by the Chinese government to improve air quality during the 2016 G20 Summit in Hangzhou China. The lower level of PM_2.5 (32.48 ± 11.03 µg/m³) observed during the control period compared to pre-control and post-control periods showed that PM_2.5 was alleviated by control policies. Based on the mass concentrations of particulate components, the emissions of PM_2.5 from local sources including fossil fuel, coal combustion, industry and construction were effectively reduced, but non-exhaust emission was not reduced as effectively as expected. The accumulation of SNA (SO₄^2?, NO₃^?, NH₄⁺) was observed during the control period, due to the favourable synoptic weather conditions for photochemical reactions and heterogeneous hydrolysis. Because of transboundary transport during the control period, air masses from remote areas contributed significantly to local PM_2.5. Although, secondary organic carbon (OC_sec) exhibited more sensitivity than primary organic carbon (OC_pri) to control measures, and the increased nitrogen oxidation ratio (NOR) implied the regional transport of aged secondary aerosols to the study area. Overall, the results from various approaches revealed that local pollution sources were kept under control, indicating that the implementation of mitigation measures were helpful in improving the air quality of Hangzhou during G20 summit. To reduce ambient levels of PM_2.5 further in Hangzhou, regional control policies may have to be taken so as to reduce the impact of long-range transport of air masses from inland China.     

污水中大肠杆菌的酶联免疫检测方法研究

以城市污水处理厂二沉池出水为检测目标,比较了夹心法和直接法2种酶联免疫反应方式,分析包被抗体和酶标抗体浓度、菌液预处理等因素对检测灵敏度的影响,确定了ELISA的最佳工作条件.结果表明,检测大肠杆菌的线性区间为10CFU/mL～6×10⁴CFU/mL,最低检测限达到10CFU/mL.与传统检测方法相比,该技术具有操作简单,节省时间和费用,反应灵敏度高等优点.     

废橡胶制备燃料油和炭黑

介绍了由废旧橡胶通过催化裂解制备燃料油和炭黑的方法,着重探讨了影响燃料油产率的因素,结果表明在优化条件下燃料油收率达42％,炭黑纯度在97％以上。     

The real effect of legal institutions: Environmental courts and firm environmental protection expenditure

This paper evaluates the real effects of environmental justice reform on environmental governance at the firm level. Using the establishment of environmental courts in China as a quasi-natural experiment, our difference-in-differences estimation shows that: (1) environmental courts significantly enhance environmental investment by firms, and this relationship is robust to different specifications and alternative measures; (2) three possible channels are the improved levels of justice and enforcement of environmental protection, and the mitigation of local government intervention; (3) our findings are particularly pronounced in subsamples with severe local protectionism, state-owned enterprises (SOEs), and non-SOEs with political connections; (4) at the city-level, environmental courts significantly increase air quality and promote cities to cross the inflection point of the environmental Kuznets curve earlier. Overall, this paper reveals the micro-mechanisms behind the real effects of environmental justice on firm environmental investment, thus providing timely implications for regulators concerned with environmental protection.