I have read all the ...

I have read all the responses to your question and surely one common thread seems to be tackling the odor. While Odor causing bacteria are best removed by microbial products you then have to disinfect the water. 

There are several issues with the use of Hypochlorite and Ozone and they are short residual time in the wastewater. The residual presence is important to treat and disinfect the wastewater. If you want to treat the algae then it is best done by chlorine dioxide. We have done it at several places in India. We add the chlorine dioxide to the pond at night and leave it over night. When you come in the next day the algae settles to the bottom of the pond. This can than be removed using a manual scraper. 

The very fact that you have algal growth every 2 days shows that there are nutrients in your wastewater. When the nutrients are present along with sunlight and carbon dioxide in the air the algae will grow back. When you remove the algae from the pond all of it never gets removed. 

So you have 2 issues. You want to deal with odor than you need to treat the wastewater with microbial products. We deal in these as well as in chlorine dioxide as a disinfectant.

Now the advantages of chlorine dioxide over chlorine and ozone are critical for you to understand why chlorine dioxide is the best choice. When you add chlorine or Ozone to the wastewater there is a reaction that takes place with the organics in the wastewater. Chlorine produces chloroform and Ozone produces Bromates. Both are carcinogens, that is chloroform and bromate. Besides this chlorine dioxide will assist in the reduction of COD loads in your wastewater.