Carus Corporation articles

PROBLEM

Hydrogen sulfide (H2S) results from septic conditions during the collection and treatment of wastewater. H2S has long been recognized as a major problem for municipal wastewater systems. This colorless gas, known for its rotten egg smell, is produced by the biological reduction of sulfates and the decomposition of organic material. It forms at virtually every point in a system from interceptors, force mains and lift stations, to holding tanks, mechanical de

INFORMATION

Carus Corporation has a long history of developing and providing a variety of permanganate products for chemical oxidation applications. Carus is also a leading provider of phosphate products for sequestration and corrosion control. Phosphates are widely used as water treatment chemicals (dry or liquid solutions) to correct problems resulting from inorganic groundwater contaminants (iron, manganese, calcium, etc.) and also to maintain water quality (inh

BACKGROUND

The Carbondale Water Treatment Plant (Carbondale, Illinois) with a design capacity of 8 MGD and an average flow of 4.6 MGD draws its water from Cedar Creek Lake. Because of moderately high raw water TOC levels (4.3 - 6.5 mg/L) and low alkalinity (36 - 40 mg/L as CaCO3), Carbondale is required to attain 45 percent TOC removal under the Disinfection/Disinfection By-Product (D/DBP) Rule. Based on their HAA and THM formation potentials (80-200 and 140-260 &m

Background
The Milan Wastewater Treatment Plant, located just south of Moline, Illinois, is a 1.7 MGD (6,434 m3/day) activated sludge facility with an average wastewater flow of 700,000 gpd to 800,000 gpd.

This facility dewaters primary sludge using a belt filter press (Figure 1). The press operates an average of three times per month, 8 hours per day at a pump rate of 100 gpm. The sludge is dewatered from 3-4% solids to about 23% solids.

Problem<

In municipal and industrial waste treatment, hydrogen sulfide is not the only offensive gas generated from anaerobic decomposition. Mercaptans (RSH) are the organic equivalent to hydrogen sulfide and more odorous at 1/1000th the concentration. Mercaptans are naturally occurring from the degradation of sulfur containing organics (proteins, etc.). A table of commonly found mercaptans is presented on the reverse side.

Oxidation is the only method that completely eliminates mercaptan o

Summary

A mid-western township is responsible for operating and maintaining a combined sewer collection system consisting of 150 miles of pipeline and 28 pumping stations. The township does not treat the wastewater, instead contracting with a neighboring city for this service.

The township has two final lift stations that transfer the collected wastewater to the neighboring system for treatment. One of these master pump stations is located adjacent to the sewe

Collection Systems Are Tough!
With miles of pipe and multiple pumping stations, managing the complexity of a wastewater collection system is a full time job. The main task is to maintain the system and keep it flowing. But also near the top of that task list is preventing nuisance odors.

When the phone starts ringing, you become a detective. First, you have to find the site or sites of odor release. Then, you have to determine why and when the problem occurs. Fin

Background

In municipal and industrial waste treatment, hydrogen sulfide is not the only offensive gas generated from anaerobic decomposition. Mercaptans (RSH) are the organic equivalent to hydrogen sulfide and more odorous at 1/1000th the concentration. Mercaptans are naturally occurring from the degradation of sulfur containing organics (proteins, etc.).   A table of commonly found mercaptans is presented on the reverse side.

Oxidation is the