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Guidelines for Treatment of Liquid Waste Streams

John Huang, Ph.D., PE and John Poullain, PE

This two-hour online course provides general guidelines for treating hazardous liquid waste streams by air stripping and biological processes. The guidelines assist in the selection of remedial actions for treating hazardous and toxic waste (HTW) contaminants. Air stripping, a mechanical method using lagoons and packed towers, is discussed. Biological methods include trickling filters, rotating biological contactors, activated sludge systems and waste stabilization ponds. The basis for selecting a treatment method, criteria for optimum performance, advantages and disadvantages are presented for consideration. Remedial actions performed at a contaminated site must comply with federal and state regulations.

This course provides general technical guidelines and methods for the treatment of liquid waste by physical and biological methods. Physical treatment methods include air or stream stripping and absorption or both methods used in combination. Biological treatment methods use the action of microbes similar to that of ecosystems but at much faster rates. Organics in solution are removed, partly mineralized and partly collected as a semi solid or sludge and separated from the liquid waste. Treatment of liquid waste renders such waste and any residues left from treatment methods non-hazardous and safer to dispose of, to transport or to store.

Liquid waste includes: leachates, ground water, surface water and effluents generated by other treatment measures. Liquid wastes vary considerably depending on the type of activity generating them; waste from the oil industry contains oily substances and hydrocarbons while galvanic industries generate heavy metals. Ground water may be contaminated from fuel storage, chemical leakage, fuel spills, underground pipeline failures, runoff of chemical preservatives, uncontrolled disposal of HTW materials and other sources. Contaminants include chlorinated, aromatic or polycyclic hydrocarbons, solvents, ammonia, hydrogen sulfide or heavy metals.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.

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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.