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Improving granular carbon treatment
1971
The magnitude and effects of biological activity in expanded carbon beds used for direct clarification/adsorption treatment of wastewater were investigated. Major aspects of the project involved comparisons of the relative effectiveness of aerobic and anaerobic conditions in the expanded-bed systems, and a comparison of the relative treatment effectiveness of expanded carbon beds of high and low sorptive activity under aerobic operating conditions. The use of short polishing columns to remove traces or organics escaping from on-line adsorbers was also evaluated.
显示更多 [+] 显示较少 [-]Evolution of Federal air pollution control policy, 1948-1967
1971
Dyck, Robert G.
Storm water management model
1971
Lager, John A. | Pyatt, E. E. (Edwin E) | Shubinski, Robert P (Robert Parker)
Symposium on air pollution | Arizona law review
1971
Kennedy, Harold W.
Limestone treatment of rinse waters from hydrochloric acid pickling of steel
1971
Environmental impact of highway deicing
1971
Struzeski, Ed
Deicing agents for removal of ice and snow from highways and streets are essential to wintertime road maintenance in most areas of the U.S. Due to the ever-increasing use of highway deicing materials, there has been growing concern as to environmental effects resulting from these practices. The state-of-the-art report critically reviews the available information on methods, equipment and materials used for snow and ice removal; chlorides found in rainfall and municipal sewage during the winter; salt runoff from streets and highways; deicing compounds found in surface streams, public water supplies, groundwater, farm ponds and lakes; special additives incorporated into deicing agents; vehicular corrosion and deterioration of highway structures and pavements; and effects on roadside soils, vegetation and trees. Highway deicing can cause injury and damage across a wide environmental spectrum. Recommendations describe future research, development and demonstration efforts necessary to assess and reduce the adverse impact of highway deicing.
显示更多 [+] 显示较少 [-]Water supply and pollution control
1971
Clark, John W (John William) | Viessman, Warren | Hammer, Mark J.
Suitable for university undergraduate courses but also serves as a useful reference book for graduate students and practicing engineers.
显示更多 [+] 显示较少 [-]Livestock waste management and pollution abatement
1971
Water pollution control legislation-- 1971 (proposed amendments to existing legislation)
1971
Mercury pollution and enforcement of the Refuse act of 1899 | Refuse act of 1899
1971-9999
