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Acid Mine Drainage Treatment Case Study

Advanced Oxidation for High Strength Caustic Wastewater Case Study

IN-SITU CHEMICAL OXIDATION (ISCO) WITH TOTAL CHEMICAL MANAGEMENT

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Project Scope

A Northeast engineering firm was selected to clean up a former roofing tar manufacturing site in Queens, NY. Following extensive bench testing and a comprehensive pilot study, they selected a treatment program using a remediation contractor’s surfactant enhanced In-Situ Chemical Oxidation (ISCO) technology. Due to the extent of contamination and the significant quantities of surfactant, sodium persulfate, and sodium hydroxide required, equipment and field services were required to remediate the site.

The remedial design required high flows (5-20 gallons per minute) of chemicals to be injected site-wide on a daily basis. This required storage and management of bulk chemicals on-site, creating operational and financial challenges for the contractor. USP Technologies developed a Total Chemical Management program to safely and cost-effectively execute the project. Safety and environmental compliance were critical considerations due to the project location in a highly-populated area and proximity to waterways.

Solution

Based on project requirements, USP developed a Total Chemical Management program to meet project schedules and budget objectives:

Site Analysis and Hazards Review

USP engineering personnel worked closely with the remediation contractor to evaluate and plan for the specific hazards of the project site. Project duration occurred over the winter and required equipment and operational adaptation to extreme cold, rain, and snow. Operations within close proximity to the public and public water required strict site safety and environmental procedures.

Read More Download Case Study_Remediation_In-Situ-17-HR (pdf)[/vc_column_text][/vc_column][/vc_row]

NEW YORK ISCO PROJECT – TOTAL CHEMICAL MANAGEMENT PROGRAM

Project Scope

A remediation contractor received a contract to clean up a former Manufactured Gas Plant (MGP) waste collection area. After thorough site characterization, bench testing and a pilot study, the consulting engineer and the remediation contractor selected the contractor’s patent-pending, surfactant-enhanced In-Situ Chemical Oxidation (ISCO) as the treatment technology. Due to the magnitude of the contamination and the widespread nature of the groundwater contamination, significant quantities of proprietary surfactant, iron chelate, sodium persulfate, and caustic, as well as equipment and field services were required to execute the site remediation.

The scope and structure of the project required that a high volume of multiple chemicals be mobilized quickly, which created a significant operational and cost challenge for the contractor. USP Technologies (USP) developed a Total Chemical Management program to accomplish the project efficiently and cost-effectively.

Solution

Based on the requirements for the project, USP developed a Total Chemical Management program to meet project schedules and budget objectives:

Site Analysis and Hazards Review

USP engineering personnel worked closely with the remediation contractor to evaluate and plan for the specific hazards of the project site. Project duration was multi-seasonal and required equipment and operational adaptation to extreme heat, extreme cold and rain.

Read More Download Case Study_New York ISCO Project-17-HR (pdf)

CONTROL OF NOx EMISSIONS IN A CONTINUOUS TITANIUM SHEET METAL PICKLING BATH

Project Scope

A large stainless steel and titanium pickling and finishing company had an issue with visible NOx fumes discharging out of one of their Midwest facilities. The plant had been tasked with the elimination of the fumes that were being generated from their various pickling baths they utilize. Visible threshold limits for NOx gas are generally 300-400 ppm depending on weather conditions. One of the facilities pickling baths is particularly aggressive and pickles a continuous titanium sheet on a coiler machine and has twice the residence time of other treatments in turn generating high levels of NOx. This can overwhelm the stack gas scrubber, causing NOx levels to rise well over 600 ppm with orange plumes emanating from the plant which are visible to the public.

The company’s environmental department reached out to USP Technologies (USP) for assistance. Initial discussions with USP confirmed successful implementation of their hydrogen peroxide (H2O2) technology to pickling baths can specifically inhibit NOx formation. USP had done prior work for stainless steel finishers and it was deemed the technology was transferrable to titanium processing.

Technology

On a mass basis, the H2O2 demand is a composite of that due to NO2 and NO, with the typical 50:50 ratio producing a theoretical demand of approximately 1.0 parts H2O2 per part NOx.

HNO2 + H2O2 → HNO3 + H2O Wt. ratio: 0.4

2NO + 3H2O2 2HNO3 + 2H2O Wt. ratio: 1.7

As shown in the reactions above, oxidation of NOx by H2O2 in-bath, produces nitric acid, thereby allowing recovery and reuse of a critical process reagent.

Solution

After initial testing, a full-scale demo was put in place for several months on the coiler bath at the plant. USP’s turn-key supply scope included 50 percent technical grade H2O2, a 3,000 gallon double walled bulk storage and an automated feed system. The turn-key system was solely maintained by USP. The program also included USP’s ChemWatch™ – advanced control system with remote telemetry, allowing tank monitoring for inventory and pump systems control and analysis.

The tank and pump system are located in the middle of the coil storage area. Since the delivery connection is outside of the building, the system employs a remote delivery alarm system. Results shown in Figure 1 demonstrates how after an initial high dose of H2O2 to treat the NOx that had already built up in the bath, the NOx emissions were effectively controlled with a steady feed rate of 5 gph.

Read More Download Case Study_Pickling Bath-17-HR (pdf)

REFINERY GRADE HYDROGEN PEROXIDE ELIMINATES HAZARDOUS HYDROGEN SULFIDE GAS RELEASES DURING COKER UNIT OPERATIONS

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Project Scope

A gulf coast refinery was experiencing unacceptable hydrogen sulfide (H2S) releases into occupied work areas in the Coker unit during cutting & quenching operations. Refinery Coker units are used to process residual oil or ‘heavy ends’. A part of the coking process requires quenching the hot coke with water, resulting in latent hydrogen sulfide being transferred to the water stream and stripping into the vapor phase creating potential exposure risks to operations personnel. In order to protect worker s, hydrogen sulfides in the process water stream must be eliminated.

In late 2016, USP Technologies (USP), leaders in peroxygen-based technologies for industrial water and wastewater treatment applications, was contacted by the refinery in search of a viable solution for its H2S issues. USP recommended a full-service chemical treatment program which included 27% refinery grade hydrogen peroxide, chemical storage, a dosing equipment system, inventory analysis, logistics management, safety training and ongoing field and technical support.

Full-Service Hydrogen Peroxide Treatment Program

The refinery recycles coker quench water in a closed loop, where any chemical used for treatment cannot negatively impact the coking process. Under near neutral pH conditions, the theoretical weight ratio of H2O2:H2S is 1:1, and proceeds according to the following reaction:

H2O2 + H2S S0 + 2 H2O

Since the products of the above reaction are water and inactive elemental sulfur, the chemistry does not negatively impact the batch coking process.

  Read More Download Case Study_Refinery Coker Quenchwater-18-HR (pdf)[/vc_column_text][/vc_column][/vc_row]

City of Wichita, Kansas’ Odor Control Program – Continuing Optimization with a Cost-Conscious Approach

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ABSTRACT

This paper describes the evolving odor control program of the City of Wichita, Kansas from 2008 to 2015. In 2010, the City reduced odor control technology expenditure due to a reduction of revenues. The odors increased resulting in an upswing in citizen complaints as well as more corrosion in existing plant and lift station equipment. In 2013, the City re-evaluated their existing technology approaches to odor control and implemented optimized chemical dosing strategies to maximize cost-effectiveness and provide wide-ranging benefits. USP Technologies (USP) partnered with the City to implement state of the art chemical dosing controls to efficiently target sulfides with their hydrogen peroxide (H2O2) and peroxide regenerated iron sulfide control (PRI-SC®) treatment programs. Implementing the proper treatment technology and chemical dosing controls resulted in dramatically reduced sulfide levels in both the liquid and gaseous phases while providing more cost-effective treatment.

KEYWORDS

Odor control, cost-conscious approach, Wichita, hydrogen sulfide, PRI-SC®, peroxide regenerated iron – sulfide control, hydrogen peroxide, ferrous chloride, RFQ process, odor complaints, corrosion control

Read More Download Wichita – OAP 2016 (pdf) Download Wichita Odor Control PPT – OAP 2016 (pdf)[/vc_column_text][/vc_column][/vc_row]

Temporary Phenol Oxidation Program to Support a Refinery Aeration Basin Turnaround – Lab Treatability Testing Through Successful Full Scale Implementation – A Case Study

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ABSTRACT

In 2015, a maintenance turnaround of the wastewater aeration tank was undertaken at United Refining Company in Warren, PA. During the planned 70 day turnaround, the refinery needed a temporary chemical oxidation program to maintain compliance with permitted effluent phenol levels. This paper will present data and key learnings from all phases of this successful project, including laboratory treatability testing, process design, full scale implementation and successful completion.

KEYWORDS: Phenol, Aeration Basin, Oxidation, Permanganate, Dissolved Air Flotation (DAF), Total Suspended Solids (TSS)

Read More

Download United Refining Company – IWC 2016 (pdf)[/vc_column_text][/vc_column][/vc_row]

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